xref: /openbmc/u-boot/README (revision ab584d67c5a7c2349685274a711b579c28d5aaaf)
1c609719bSwdenk#
2eca3aeb3SWolfgang Denk# (C) Copyright 2000 - 2013
3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4c609719bSwdenk#
5eca3aeb3SWolfgang Denk# SPDX-License-Identifier:	GPL-2.0+
6c609719bSwdenk#
7c609719bSwdenk
8c609719bSwdenkSummary:
9c609719bSwdenk========
10c609719bSwdenk
1124ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for
12e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other
13e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to
14e86e5a07Swdenkinitialize and test the hardware or to download and run application
15e86e5a07Swdenkcode.
16c609719bSwdenk
17c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of
1824ee89b9Swdenkthe source code originate in the Linux source tree, we have some
1924ee89b9Swdenkheader files in common, and special provision has been made to
20c609719bSwdenksupport booting of Linux images.
21c609719bSwdenk
22c609719bSwdenkSome attention has been paid to make this software easily
23c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are
24c609719bSwdenkimplemented with the same call interface, so that it's very easy to
25c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used
26c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can
27c609719bSwdenkload and run it dynamically.
28c609719bSwdenk
29c609719bSwdenk
30c609719bSwdenkStatus:
31c609719bSwdenk=======
32c609719bSwdenk
33c609719bSwdenkIn general, all boards for which a configuration option exists in the
34c609719bSwdenkMakefile have been tested to some extent and can be considered
35c609719bSwdenk"working". In fact, many of them are used in production systems.
36c609719bSwdenk
37c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out
3827af930eSAlbert ARIBAUDwho contributed the specific port. The boards.cfg file lists board
39218ca724SWolfgang Denkmaintainers.
40c609719bSwdenk
41adb9d851SRobert P. J. DayNote: There is no CHANGELOG file in the actual U-Boot source tree;
42adb9d851SRobert P. J. Dayit can be created dynamically from the Git log using:
43adb9d851SRobert P. J. Day
44adb9d851SRobert P. J. Day	make CHANGELOG
45adb9d851SRobert P. J. Day
46c609719bSwdenk
47c609719bSwdenkWhere to get help:
48c609719bSwdenk==================
49c609719bSwdenk
50c609719bSwdenkIn case you have questions about, problems with or contributions for
51c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
520c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
530c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
540c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
550c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
56c609719bSwdenk
57c609719bSwdenk
58218ca724SWolfgang DenkWhere to get source code:
59218ca724SWolfgang Denk=========================
60218ca724SWolfgang Denk
61218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
62218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
63218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
64218ca724SWolfgang Denk
65218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
6611ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
67218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
68218ca724SWolfgang Denkdirectory.
69218ca724SWolfgang Denk
70d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
71218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
72218ca724SWolfgang Denk
73218ca724SWolfgang Denk
74c609719bSwdenkWhere we come from:
75c609719bSwdenk===================
76c609719bSwdenk
77c609719bSwdenk- start from 8xxrom sources
7824ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
79c609719bSwdenk- clean up code
80c609719bSwdenk- make it easier to add custom boards
81c609719bSwdenk- make it possible to add other [PowerPC] CPUs
82c609719bSwdenk- extend functions, especially:
83c609719bSwdenk  * Provide extended interface to Linux boot loader
84c609719bSwdenk  * S-Record download
85c609719bSwdenk  * network boot
8611ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
8724ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
88c609719bSwdenk- add other CPU families (starting with ARM)
8924ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
900d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
9124ee89b9Swdenk
9224ee89b9Swdenk
9324ee89b9SwdenkNames and Spelling:
9424ee89b9Swdenk===================
9524ee89b9Swdenk
9624ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
9724ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
9824ee89b9Swdenkin source files etc.). Example:
9924ee89b9Swdenk
10024ee89b9Swdenk	This is the README file for the U-Boot project.
10124ee89b9Swdenk
10224ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
10324ee89b9Swdenk
10424ee89b9Swdenk	include/asm-ppc/u-boot.h
10524ee89b9Swdenk
10624ee89b9Swdenk	#include <asm/u-boot.h>
10724ee89b9Swdenk
10824ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
10924ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
11024ee89b9Swdenk
11124ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
11224ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
113c609719bSwdenk
114c609719bSwdenk
11593f19cc0SwdenkVersioning:
11693f19cc0Swdenk===========
11793f19cc0Swdenk
118360d883aSThomas WeberStarting with the release in October 2008, the names of the releases
119360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning
120360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by
121360d883aSThomas Webernames consisting of the calendar year and month of the release date.
122360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix
123360d883aSThomas Weberreleases in "stable" maintenance trees.
12493f19cc0Swdenk
125360d883aSThomas WeberExamples:
126360d883aSThomas Weber	U-Boot v2009.11	    - Release November 2009
127360d883aSThomas Weber	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
128360d883aSThomas Weber	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
12993f19cc0Swdenk
13093f19cc0Swdenk
131c609719bSwdenkDirectory Hierarchy:
132c609719bSwdenk====================
133c609719bSwdenk
1348d321b81SPeter Tyser/arch			Architecture specific files
1356eae68e4SMasahiro Yamada  /arc			Files generic to ARC architecture
1366eae68e4SMasahiro Yamada    /cpu		CPU specific files
1376eae68e4SMasahiro Yamada      /arc700		Files specific to ARC 700 CPUs
1386eae68e4SMasahiro Yamada    /lib		Architecture specific library files
1398d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1408d321b81SPeter Tyser    /cpu		CPU specific files
1418d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1428d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1436eb0921aSAndreas Bießmann	/at91		Files specific to Atmel AT91RM9200 CPU
1448d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1458d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1468d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1478d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1488d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1498d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1508d321b81SPeter Tyser    /lib		Architecture specific library files
1518d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1528d321b81SPeter Tyser    /cpu		CPU specific files
1538d321b81SPeter Tyser    /lib		Architecture specific library files
1548d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1558d321b81SPeter Tyser    /cpu		CPU specific files
1568d321b81SPeter Tyser    /lib		Architecture specific library files
1578d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1588d321b81SPeter Tyser    /cpu		CPU specific files
1598d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1608d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1618d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1628d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1638d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1648d321b81SPeter Tyser    /lib		Architecture specific library files
1658d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1668d321b81SPeter Tyser    /cpu		CPU specific files
1678d321b81SPeter Tyser    /lib		Architecture specific library files
1688d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1698d321b81SPeter Tyser    /cpu		CPU specific files
17092bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
1716eae68e4SMasahiro Yamada      /mips64		Files specific to MIPS64 CPUs
1728d321b81SPeter Tyser    /lib		Architecture specific library files
173afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
174afc1ce82SMacpaul Lin    /cpu		CPU specific files
175afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
176afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1778d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1788d321b81SPeter Tyser    /cpu		CPU specific files
1798d321b81SPeter Tyser    /lib		Architecture specific library files
18033c7731bSRobert P. J. Day  /openrisc		Files generic to OpenRISC architecture
18133c7731bSRobert P. J. Day    /cpu		CPU specific files
18233c7731bSRobert P. J. Day    /lib		Architecture specific library files
183a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1848d321b81SPeter Tyser    /cpu		CPU specific files
1858d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1868d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1878d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1888d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1898d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
1908d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
1918d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
1928d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
1938d321b81SPeter Tyser    /lib		Architecture specific library files
1948d321b81SPeter Tyser  /sh			Files generic to SH architecture
1958d321b81SPeter Tyser    /cpu		CPU specific files
1968d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
1978d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
1988d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
1998d321b81SPeter Tyser    /lib		Architecture specific library files
2008d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2018d321b81SPeter Tyser    /cpu		CPU specific files
2028d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2038d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2048d321b81SPeter Tyser    /lib		Architecture specific library files
20533c7731bSRobert P. J. Day  /x86			Files generic to x86 architecture
20633c7731bSRobert P. J. Day    /cpu		CPU specific files
20733c7731bSRobert P. J. Day    /lib		Architecture specific library files
2088d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2098d321b81SPeter Tyser/board			Board dependent files
2108d321b81SPeter Tyser/common			Misc architecture independent functions
2118d321b81SPeter Tyser/disk			Code for disk drive partition handling
2128d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2138d321b81SPeter Tyser/drivers		Commonly used device drivers
21433c7731bSRobert P. J. Day/dts			Contains Makefile for building internal U-Boot fdt.
2158d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2168d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2178d321b81SPeter Tyser/include		Header Files
2188d321b81SPeter Tyser/lib			Files generic to all architectures
2198d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2208d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2218d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2228d321b81SPeter Tyser/net			Networking code
2238d321b81SPeter Tyser/post			Power On Self Test
22433c7731bSRobert P. J. Day/spl			Secondary Program Loader framework
2258d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
226c609719bSwdenk
227c609719bSwdenkSoftware Configuration:
228c609719bSwdenk=======================
229c609719bSwdenk
230c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
231c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
232c609719bSwdenk
233c609719bSwdenkThere are two classes of configuration variables:
234c609719bSwdenk
235c609719bSwdenk* Configuration _OPTIONS_:
236c609719bSwdenk  These are selectable by the user and have names beginning with
237c609719bSwdenk  "CONFIG_".
238c609719bSwdenk
239c609719bSwdenk* Configuration _SETTINGS_:
240c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
241c609719bSwdenk  you don't know what you're doing; they have names beginning with
2426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
243c609719bSwdenk
244c609719bSwdenkLater we will add a configuration tool - probably similar to or even
245c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
246c609719bSwdenkdo the configuration by hand, which means creating some symbolic
247c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
248c609719bSwdenkas an example here.
249c609719bSwdenk
250c609719bSwdenk
251c609719bSwdenkSelection of Processor Architecture and Board Type:
252c609719bSwdenk---------------------------------------------------
253c609719bSwdenk
254c609719bSwdenkFor all supported boards there are ready-to-use default
255*ab584d67SHolger Freytherconfigurations available; just type "make <board_name>_defconfig".
256c609719bSwdenk
257c609719bSwdenkExample: For a TQM823L module type:
258c609719bSwdenk
259c609719bSwdenk	cd u-boot
260*ab584d67SHolger Freyther	make TQM823L_defconfig
261c609719bSwdenk
26211ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
263*ab584d67SHolger Freythere.g. "make cogent_mpc8xx_defconfig". And also configure the cogent
264c609719bSwdenkdirectory according to the instructions in cogent/README.
265c609719bSwdenk
266c609719bSwdenk
26775b3c3aaSSimon GlassSandbox Environment:
26875b3c3aaSSimon Glass--------------------
26975b3c3aaSSimon Glass
27075b3c3aaSSimon GlassU-Boot can be built natively to run on a Linux host using the 'sandbox'
27175b3c3aaSSimon Glassboard. This allows feature development which is not board- or architecture-
27275b3c3aaSSimon Glassspecific to be undertaken on a native platform. The sandbox is also used to
27375b3c3aaSSimon Glassrun some of U-Boot's tests.
27475b3c3aaSSimon Glass
27575b3c3aaSSimon GlassSee board/sandbox/sandbox/README.sandbox for more details.
27675b3c3aaSSimon Glass
27775b3c3aaSSimon Glass
278c609719bSwdenkConfiguration Options:
279c609719bSwdenk----------------------
280c609719bSwdenk
281c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
282c609719bSwdenksuch information is kept in a configuration file
283c609719bSwdenk"include/configs/<board_name>.h".
284c609719bSwdenk
285c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
286c609719bSwdenk"include/configs/TQM823L.h".
287c609719bSwdenk
288c609719bSwdenk
2897f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2907f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2917f6c2cbcSwdenkbuild a config tool - later.
2927f6c2cbcSwdenk
2937f6c2cbcSwdenk
294c609719bSwdenkThe following options need to be configured:
295c609719bSwdenk
2962628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
297c609719bSwdenk
2982628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2996ccec449SWolfgang Denk
3006ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
30109ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
302c609719bSwdenk
303c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
304c609719bSwdenk		Define exactly one of
305c609719bSwdenk		CONFIG_CMA286_60_OLD
306c609719bSwdenk--- FIXME --- not tested yet:
307c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
308c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
309c609719bSwdenk
310c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
311c609719bSwdenk		Define exactly one of
312c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
313c609719bSwdenk
314c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
315c609719bSwdenk		Define one or more of
316c609719bSwdenk		CONFIG_CMA302
317c609719bSwdenk
318c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
319c609719bSwdenk		Define one or more of
320c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
32111ccc33fSMarcel Ziswiler					  the LCD display every second with
322c609719bSwdenk					  a "rotator" |\-/|\-/
323c609719bSwdenk
324cf946c6dSLei Wen- Marvell Family Member
325cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
326cf946c6dSLei Wen					  multiple fs option at one time
327cf946c6dSLei Wen					  for marvell soc family
328cf946c6dSLei Wen
329c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
330c609719bSwdenk		Define exactly one of
331c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
332c609719bSwdenk
33311ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
33466ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
33566ca92a5Swdenk					  get_gclk_freq() cannot work
3365da627a4Swdenk					  e.g. if there is no 32KHz
3375da627a4Swdenk					  reference PIT/RTC clock
33866ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
33966ca92a5Swdenk					  or XTAL/EXTAL)
340c609719bSwdenk
34166ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
34466ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
34575d1ea7fSwdenk			See doc/README.MPC866
34675d1ea7fSwdenk
3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
34875d1ea7fSwdenk
34975d1ea7fSwdenk		Define this to measure the actual CPU clock instead
35075d1ea7fSwdenk		of relying on the correctness of the configured
35175d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
35275d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
35375d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
35575d1ea7fSwdenk
356506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
357506f3918SHeiko Schocher
358506f3918SHeiko Schocher		Define this option if you want to enable the
359506f3918SHeiko Schocher		ICache only when Code runs from RAM.
360506f3918SHeiko Schocher
36166412c63SKumar Gala- 85xx CPU Options:
362ffd06e02SYork Sun		CONFIG_SYS_PPC64
363ffd06e02SYork Sun
364ffd06e02SYork Sun		Specifies that the core is a 64-bit PowerPC implementation (implements
365ffd06e02SYork Sun		the "64" category of the Power ISA). This is necessary for ePAPR
366ffd06e02SYork Sun		compliance, among other possible reasons.
367ffd06e02SYork Sun
36866412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36966412c63SKumar Gala
37066412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
37166412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
37266412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
37366412c63SKumar Gala
3748f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3758f29084aSKumar Gala
3768f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3778f29084aSKumar Gala		tree nodes for the given platform.
3788f29084aSKumar Gala
379afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
380afa6b551SPrabhakar Kushwaha
381afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
382afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
383afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
384afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
385afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
386afa6b551SPrabhakar Kushwaha		purpose.
387afa6b551SPrabhakar Kushwaha
38833eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
38933eee330SScott Wood
39033eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
39133eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
39233eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
39333eee330SScott Wood
39433eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
39533eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
39633eee330SScott Wood
39733eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
39833eee330SScott Wood		for which the A004510 workaround should be applied.
39933eee330SScott Wood
40033eee330SScott Wood		The rest of SVR is either not relevant to the decision
40133eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
40233eee330SScott Wood		p2041) or is implied by the build target, which controls
40333eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
40433eee330SScott Wood
40533eee330SScott Wood		See Freescale App Note 4493 for more information about
40633eee330SScott Wood		this erratum.
40733eee330SScott Wood
40874fa22edSPrabhakar Kushwaha		CONFIG_A003399_NOR_WORKAROUND
40974fa22edSPrabhakar Kushwaha		Enables a workaround for IFC erratum A003399. It is only
41074fa22edSPrabhakar Kushwaha		requred during NOR boot.
41174fa22edSPrabhakar Kushwaha
41233eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
41333eee330SScott Wood
41433eee330SScott Wood		This is the value to write into CCSR offset 0x18600
41533eee330SScott Wood		according to the A004510 workaround.
41633eee330SScott Wood
41764501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_DDR_ADDR
41864501c66SPriyanka Jain		This value denotes start offset of DDR memory which is
41964501c66SPriyanka Jain		connected exclusively to the DSP cores.
42064501c66SPriyanka Jain
421765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
422765b0bdbSPriyanka Jain		This value denotes start offset of M2 memory
423765b0bdbSPriyanka Jain		which is directly connected to the DSP core.
424765b0bdbSPriyanka Jain
42564501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
42664501c66SPriyanka Jain		This value denotes start offset of M3 memory which is directly
42764501c66SPriyanka Jain		connected to the DSP core.
42864501c66SPriyanka Jain
429765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
430765b0bdbSPriyanka Jain		This value denotes start offset of DSP CCSR space.
431765b0bdbSPriyanka Jain
432b135991aSPriyanka Jain		CONFIG_SYS_FSL_SINGLE_SOURCE_CLK
433b135991aSPriyanka Jain		Single Source Clock is clocking mode present in some of FSL SoC's.
434b135991aSPriyanka Jain		In this mode, a single differential clock is used to supply
435b135991aSPriyanka Jain		clocks to the sysclock, ddrclock and usbclock.
436b135991aSPriyanka Jain
437fb4a2409SAneesh Bansal		CONFIG_SYS_CPC_REINIT_F
438fb4a2409SAneesh Bansal		This CONFIG is defined when the CPC is configured as SRAM at the
439fb4a2409SAneesh Bansal		time of U-boot entry and is required to be re-initialized.
440fb4a2409SAneesh Bansal
441aade2004STang Yuantian		CONFIG_DEEP_SLEEP
442aade2004STang Yuantian		Inidcates this SoC supports deep sleep feature. If deep sleep is
443aade2004STang Yuantian		supported, core will start to execute uboot when wakes up.
444aade2004STang Yuantian
4456cb461b4SDaniel Schwierzeck- Generic CPU options:
4462a1680e3SYork Sun		CONFIG_SYS_GENERIC_GLOBAL_DATA
4472a1680e3SYork Sun		Defines global data is initialized in generic board board_init_f().
4482a1680e3SYork Sun		If this macro is defined, global data is created and cleared in
4492a1680e3SYork Sun		generic board board_init_f(). Without this macro, architecture/board
4502a1680e3SYork Sun		should initialize global data before calling board_init_f().
4512a1680e3SYork Sun
4526cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
4536cb461b4SDaniel Schwierzeck
4546cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
4556cb461b4SDaniel Schwierzeck		values is arch specific.
4566cb461b4SDaniel Schwierzeck
4575614e71bSYork Sun		CONFIG_SYS_FSL_DDR
4585614e71bSYork Sun		Freescale DDR driver in use. This type of DDR controller is
4595614e71bSYork Sun		found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core
4605614e71bSYork Sun		SoCs.
4615614e71bSYork Sun
4625614e71bSYork Sun		CONFIG_SYS_FSL_DDR_ADDR
4635614e71bSYork Sun		Freescale DDR memory-mapped register base.
4645614e71bSYork Sun
4655614e71bSYork Sun		CONFIG_SYS_FSL_DDR_EMU
4665614e71bSYork Sun		Specify emulator support for DDR. Some DDR features such as
4675614e71bSYork Sun		deskew training are not available.
4685614e71bSYork Sun
4695614e71bSYork Sun		CONFIG_SYS_FSL_DDRC_GEN1
4705614e71bSYork Sun		Freescale DDR1 controller.
4715614e71bSYork Sun
4725614e71bSYork Sun		CONFIG_SYS_FSL_DDRC_GEN2
4735614e71bSYork Sun		Freescale DDR2 controller.
4745614e71bSYork Sun
4755614e71bSYork Sun		CONFIG_SYS_FSL_DDRC_GEN3
4765614e71bSYork Sun		Freescale DDR3 controller.
4775614e71bSYork Sun
47834e026f9SYork Sun		CONFIG_SYS_FSL_DDRC_GEN4
47934e026f9SYork Sun		Freescale DDR4 controller.
48034e026f9SYork Sun
4819ac4ffbdSYork Sun		CONFIG_SYS_FSL_DDRC_ARM_GEN3
4829ac4ffbdSYork Sun		Freescale DDR3 controller for ARM-based SoCs.
4839ac4ffbdSYork Sun
4845614e71bSYork Sun		CONFIG_SYS_FSL_DDR1
4855614e71bSYork Sun		Board config to use DDR1. It can be enabled for SoCs with
4865614e71bSYork Sun		Freescale DDR1 or DDR2 controllers, depending on the board
4875614e71bSYork Sun		implemetation.
4885614e71bSYork Sun
4895614e71bSYork Sun		CONFIG_SYS_FSL_DDR2
4905614e71bSYork Sun		Board config to use DDR2. It can be eanbeld for SoCs with
4915614e71bSYork Sun		Freescale DDR2 or DDR3 controllers, depending on the board
4925614e71bSYork Sun		implementation.
4935614e71bSYork Sun
4945614e71bSYork Sun		CONFIG_SYS_FSL_DDR3
4955614e71bSYork Sun		Board config to use DDR3. It can be enabled for SoCs with
49634e026f9SYork Sun		Freescale DDR3 or DDR3L controllers.
49734e026f9SYork Sun
49834e026f9SYork Sun		CONFIG_SYS_FSL_DDR3L
49934e026f9SYork Sun		Board config to use DDR3L. It can be enabled for SoCs with
50034e026f9SYork Sun		DDR3L controllers.
50134e026f9SYork Sun
50234e026f9SYork Sun		CONFIG_SYS_FSL_DDR4
50334e026f9SYork Sun		Board config to use DDR4. It can be enabled for SoCs with
50434e026f9SYork Sun		DDR4 controllers.
5055614e71bSYork Sun
5061b4175d6SPrabhakar Kushwaha		CONFIG_SYS_FSL_IFC_BE
5071b4175d6SPrabhakar Kushwaha		Defines the IFC controller register space as Big Endian
5081b4175d6SPrabhakar Kushwaha
5091b4175d6SPrabhakar Kushwaha		CONFIG_SYS_FSL_IFC_LE
5101b4175d6SPrabhakar Kushwaha		Defines the IFC controller register space as Little Endian
5111b4175d6SPrabhakar Kushwaha
512690e4258SPrabhakar Kushwaha		CONFIG_SYS_FSL_PBL_PBI
513690e4258SPrabhakar Kushwaha		It enables addition of RCW (Power on reset configuration) in built image.
514690e4258SPrabhakar Kushwaha		Please refer doc/README.pblimage for more details
515690e4258SPrabhakar Kushwaha
516690e4258SPrabhakar Kushwaha		CONFIG_SYS_FSL_PBL_RCW
517690e4258SPrabhakar Kushwaha		It adds PBI(pre-boot instructions) commands in u-boot build image.
518690e4258SPrabhakar Kushwaha		PBI commands can be used to configure SoC before it starts the execution.
519690e4258SPrabhakar Kushwaha		Please refer doc/README.pblimage for more details
520690e4258SPrabhakar Kushwaha
52189ad7be8SPrabhakar Kushwaha		CONFIG_SPL_FSL_PBL
52289ad7be8SPrabhakar Kushwaha		It adds a target to create boot binary having SPL binary in PBI format
52389ad7be8SPrabhakar Kushwaha		concatenated with u-boot binary.
52489ad7be8SPrabhakar Kushwaha
5254e5b1bd0SYork Sun		CONFIG_SYS_FSL_DDR_BE
5264e5b1bd0SYork Sun		Defines the DDR controller register space as Big Endian
5274e5b1bd0SYork Sun
5284e5b1bd0SYork Sun		CONFIG_SYS_FSL_DDR_LE
5294e5b1bd0SYork Sun		Defines the DDR controller register space as Little Endian
5304e5b1bd0SYork Sun
5316b9e309aSYork Sun		CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY
5326b9e309aSYork Sun		Physical address from the view of DDR controllers. It is the
5336b9e309aSYork Sun		same as CONFIG_SYS_DDR_SDRAM_BASE for  all Power SoCs. But
5346b9e309aSYork Sun		it could be different for ARM SoCs.
5356b9e309aSYork Sun
5366b1e1254SYork Sun		CONFIG_SYS_FSL_DDR_INTLV_256B
5376b1e1254SYork Sun		DDR controller interleaving on 256-byte. This is a special
5386b1e1254SYork Sun		interleaving mode, handled by Dickens for Freescale layerscape
5396b1e1254SYork Sun		SoCs with ARM core.
5406b1e1254SYork Sun
5410b953ffcSMarkus Klotzbuecher- Intel Monahans options:
5426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
5430b953ffcSMarkus Klotzbuecher
5440b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
5450b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
5460b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
5470b953ffcSMarkus Klotzbuecher
5486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
5490b953ffcSMarkus Klotzbuecher
5500b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
5510b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
5520b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
5530b953ffcSMarkus Klotzbuecher		by this value.
5540b953ffcSMarkus Klotzbuecher
55592bbd64eSDaniel Schwierzeck- MIPS CPU options:
55692bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
55792bbd64eSDaniel Schwierzeck
55892bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
55992bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
56092bbd64eSDaniel Schwierzeck		relocation.
56192bbd64eSDaniel Schwierzeck
56292bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
56392bbd64eSDaniel Schwierzeck
56492bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
56592bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
56692bbd64eSDaniel Schwierzeck		Possible values are:
56792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
56892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
56992bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
57092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
57192bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
57292bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
57392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
57492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
57592bbd64eSDaniel Schwierzeck
57692bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
57792bbd64eSDaniel Schwierzeck
57892bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
57992bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
58092bbd64eSDaniel Schwierzeck
58192bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
58292bbd64eSDaniel Schwierzeck
58392bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
58492bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
58592bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
58692bbd64eSDaniel Schwierzeck
587b67d8816SChristian Riesch- ARM options:
588b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
589b67d8816SChristian Riesch
590b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
591b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
592b67d8816SChristian Riesch
5935356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
5945356f545SAneesh V
5955356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
5965356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
5975356f545SAneesh V		better code density. For ARM architectures that support
5985356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
5995356f545SAneesh V		GCC.
6005356f545SAneesh V
601c5d4752cSStephen Warren		CONFIG_ARM_ERRATA_716044
6020678587fSStephen Warren		CONFIG_ARM_ERRATA_742230
6030678587fSStephen Warren		CONFIG_ARM_ERRATA_743622
6040678587fSStephen Warren		CONFIG_ARM_ERRATA_751472
605f71cbfe3SNitin Garg		CONFIG_ARM_ERRATA_794072
606b7588e3bSNitin Garg		CONFIG_ARM_ERRATA_761320
6070678587fSStephen Warren
6080678587fSStephen Warren		If set, the workarounds for these ARM errata are applied early
6090678587fSStephen Warren		during U-Boot startup. Note that these options force the
6100678587fSStephen Warren		workarounds to be applied; no CPU-type/version detection
6110678587fSStephen Warren		exists, unlike the similar options in the Linux kernel. Do not
6120678587fSStephen Warren		set these options unless they apply!
6130678587fSStephen Warren
614795659dcSStephen Warren- CPU timer options:
615795659dcSStephen Warren		CONFIG_SYS_HZ
616795659dcSStephen Warren
617795659dcSStephen Warren		The frequency of the timer returned by get_timer().
618795659dcSStephen Warren		get_timer() must operate in milliseconds and this CONFIG
619795659dcSStephen Warren		option must be set to 1000.
620795659dcSStephen Warren
6215da627a4Swdenk- Linux Kernel Interface:
622c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
623c609719bSwdenk
624c609719bSwdenk		U-Boot stores all clock information in Hz
625c609719bSwdenk		internally. For binary compatibility with older Linux
626c609719bSwdenk		kernels (which expect the clocks passed in the
627c609719bSwdenk		bd_info data to be in MHz) the environment variable
628c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
629c609719bSwdenk		converts clock data to MHZ before passing it to the
630c609719bSwdenk		Linux kernel.
631c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
632c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
633c609719bSwdenk		default environment.
634c609719bSwdenk
6355da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
6365da627a4Swdenk
63711ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
6385da627a4Swdenk		expect it to be in bytes, others in MB.
6395da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
6405da627a4Swdenk
641fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
642f57f70aaSWolfgang Denk
643f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
644213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
645213bf8c8SGerald Van Baren		concepts).
646213bf8c8SGerald Van Baren
647213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
648213bf8c8SGerald Van Baren		 * New libfdt-based support
649213bf8c8SGerald Van Baren		 * Adds the "fdt" command
6503bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
651213bf8c8SGerald Van Baren
652b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
653b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
654b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
655b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
656f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
657c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
658f57f70aaSWolfgang Denk
65911ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
66011ccc33fSMarcel Ziswiler		addresses
6613bb342fcSKim Phillips
6624e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
6634e253137SKumar Gala
6644e253137SKumar Gala		Board code has addition modification that it wants to make
6654e253137SKumar Gala		to the flat device tree before handing it off to the kernel
6666705d81eSwdenk
6670267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
6680267768eSMatthew McClintock
66911ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
6700267768eSMatthew McClintock		param header, the default value is zero if undefined.
6710267768eSMatthew McClintock
6723887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
6733887c3fbSHeiko Schocher
6743887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
6753887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
6763887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
6773887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
6783887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
6793887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
6803887c3fbSHeiko Schocher
6817eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
6827eb29398SIgor Grinberg
6837eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
6847eb29398SIgor Grinberg		machine type and must be used to specify the machine type
6857eb29398SIgor Grinberg		number as it appears in the ARM machine registry
6867eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
6877eb29398SIgor Grinberg		Only boards that have multiple machine types supported
6887eb29398SIgor Grinberg		in a single configuration file and the machine type is
6897eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
6907eb29398SIgor Grinberg
6910b2f4ecaSNiklaus Giger- vxWorks boot parameters:
6920b2f4ecaSNiklaus Giger
6930b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
6940b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
6950b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
6960b2f4ecaSNiklaus Giger
6970b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
6980b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
6990b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
7000b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
7010b2f4ecaSNiklaus Giger
7020b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
7030b2f4ecaSNiklaus Giger
7040b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
7050b2f4ecaSNiklaus Giger
7060b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
7070b2f4ecaSNiklaus Giger		the defaults discussed just above.
7080b2f4ecaSNiklaus Giger
7092c451f78SAneesh V- Cache Configuration:
7102c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
7112c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
7122c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
7132c451f78SAneesh V
71493bc2193SAneesh V- Cache Configuration for ARM:
71593bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
71693bc2193SAneesh V				      controller
71793bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
71893bc2193SAneesh V					controller register space
71993bc2193SAneesh V
7206705d81eSwdenk- Serial Ports:
72148d0192fSAndreas Engel		CONFIG_PL010_SERIAL
7226705d81eSwdenk
7236705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
7246705d81eSwdenk
72548d0192fSAndreas Engel		CONFIG_PL011_SERIAL
7266705d81eSwdenk
7276705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
7286705d81eSwdenk
7296705d81eSwdenk		CONFIG_PL011_CLOCK
7306705d81eSwdenk
7316705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
7326705d81eSwdenk		the clock speed of the UARTs.
7336705d81eSwdenk
7346705d81eSwdenk		CONFIG_PL01x_PORTS
7356705d81eSwdenk
7366705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
7376705d81eSwdenk		define this to a list of base addresses for each (supported)
7386705d81eSwdenk		port. See e.g. include/configs/versatile.h
7396705d81eSwdenk
740910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
741910f1ae3SJohn Rigby
742910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
743910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
744910f1ae3SJohn Rigby		this variable to initialize the extra register.
745910f1ae3SJohn Rigby
746910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
747910f1ae3SJohn Rigby
748910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
749910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
750910f1ae3SJohn Rigby		variable to flush the UART at init time.
751910f1ae3SJohn Rigby
752d57dee57SKaricheri, Muralidharan		CONFIG_SERIAL_HW_FLOW_CONTROL
753d57dee57SKaricheri, Muralidharan
754d57dee57SKaricheri, Muralidharan		Define this variable to enable hw flow control in serial driver.
755d57dee57SKaricheri, Muralidharan		Current user of this option is drivers/serial/nsl16550.c driver
7566705d81eSwdenk
757c609719bSwdenk- Console Interface:
758c609719bSwdenk		Depending on board, define exactly one serial port
759c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
760c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
761c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
762c609719bSwdenk
763c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
764c609719bSwdenk		port routines must be defined elsewhere
765c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
766c609719bSwdenk
767c609719bSwdenk		CONFIG_CFB_CONSOLE
768c609719bSwdenk		Enables console device for a color framebuffer. Needs following
769c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
770c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
771c609719bSwdenk						(default big endian)
772c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
773c609719bSwdenk						rectangle fill
774c609719bSwdenk						(cf. smiLynxEM)
775c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
776c609719bSwdenk						bit-blit (cf. smiLynxEM)
777c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
778c609719bSwdenk						(cols=pitch)
779c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
780c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
781c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
782c609719bSwdenk						(0-5, cf. cfb_console.c)
783c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
784c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
785c609719bSwdenk						(i.e. i8042_kbd_init())
786c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
787c609719bSwdenk						(i.e. i8042_tstc)
788c609719bSwdenk			VIDEO_GETC_FCT		get char fct
789c609719bSwdenk						(i.e. i8042_getc)
790c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
791c609719bSwdenk						(requires blink timer
792c609719bSwdenk						cf. i8042.c)
7936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
794c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
795c609719bSwdenk						upper right corner
796602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
797c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
798c609719bSwdenk						upper left corner
799a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
800a6c7ad2fSwdenk						linux_logo.h for logo.
801a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
802c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
80311ccc33fSMarcel Ziswiler						additional board info beside
804c609719bSwdenk						the logo
805c609719bSwdenk
80633a35bbbSPali Rohár		When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
80733a35bbbSPali Rohár		a limited number of ANSI escape sequences (cursor control,
80833a35bbbSPali Rohár		erase functions and limited graphics rendition control).
80933a35bbbSPali Rohár
810c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
811c609719bSwdenk		default i/o. Serial console can be forced with
812c609719bSwdenk		environment 'console=serial'.
813c609719bSwdenk
814a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
815a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
816a3ad8e26Swdenk		the "silent" environment variable. See
817a3ad8e26Swdenk		doc/README.silent for more information.
818a3ad8e26Swdenk
81945ae2546SHeiko Schocher		CONFIG_SYS_CONSOLE_BG_COL: define the backgroundcolor, default
82045ae2546SHeiko Schocher			is 0x00.
82145ae2546SHeiko Schocher		CONFIG_SYS_CONSOLE_FG_COL: define the foregroundcolor, default
82245ae2546SHeiko Schocher			is 0xa0.
82345ae2546SHeiko Schocher
824c609719bSwdenk- Console Baudrate:
825c609719bSwdenk		CONFIG_BAUDRATE - in bps
826c609719bSwdenk		Select one of the baudrates listed in
8276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
8286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
829c609719bSwdenk
830c92fac91SHeiko Schocher- Console Rx buffer length
831c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
832c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
8332b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
834c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
835c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
836c92fac91SHeiko Schocher		the SMC.
837c92fac91SHeiko Schocher
8389558b48aSGraeme Russ- Pre-Console Buffer:
8399558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
8409558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
8419558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
8429558b48aSGraeme Russ		buffer any console messages prior to the console being
8439558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
8449558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
8459558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
8469558b48aSGraeme Russ		bytes are output before the console is initialised, the
8479558b48aSGraeme Russ		earlier bytes are discarded.
8489558b48aSGraeme Russ
8499558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
8509558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
8519558b48aSGraeme Russ
852046a37bdSSonny Rao- Safe printf() functions
853046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
854046a37bdSSonny Rao		the printf() functions. These are defined in
855046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
856046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
857046a37bdSSonny Rao		If this option is not given then these functions will
858046a37bdSSonny Rao		silently discard their buffer size argument - this means
859046a37bdSSonny Rao		you are not getting any overflow checking in this case.
860046a37bdSSonny Rao
861c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
862c609719bSwdenk		Delay before automatically booting the default image;
863c609719bSwdenk		set to -1 to disable autoboot.
86493d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
86593d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
866c609719bSwdenk
867c609719bSwdenk		See doc/README.autoboot for these options that
868c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
869c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
870c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
871c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
872c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
873c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
874c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
875c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
876c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
877c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
878c609719bSwdenk		CONFIG_RESET_TO_RETRY
879c609719bSwdenk
880c609719bSwdenk- Autoboot Command:
881c609719bSwdenk		CONFIG_BOOTCOMMAND
882c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
883c609719bSwdenk		define a command string that is automatically executed
884c609719bSwdenk		when no character is read on the console interface
885c609719bSwdenk		within "Boot Delay" after reset.
886c609719bSwdenk
887c609719bSwdenk		CONFIG_BOOTARGS
888c609719bSwdenk		This can be used to pass arguments to the bootm
889c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
890c609719bSwdenk		environment value "bootargs".
891c609719bSwdenk
892c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
893c609719bSwdenk		The value of these goes into the environment as
894c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
895c609719bSwdenk		as a convenience, when switching between booting from
89611ccc33fSMarcel Ziswiler		RAM and NFS.
897c609719bSwdenk
898eda0ba38SHeiko Schocher- Bootcount:
899eda0ba38SHeiko Schocher		CONFIG_BOOTCOUNT_LIMIT
900eda0ba38SHeiko Schocher		Implements a mechanism for detecting a repeating reboot
901eda0ba38SHeiko Schocher		cycle, see:
902eda0ba38SHeiko Schocher		http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
903eda0ba38SHeiko Schocher
904eda0ba38SHeiko Schocher		CONFIG_BOOTCOUNT_ENV
905eda0ba38SHeiko Schocher		If no softreset save registers are found on the hardware
906eda0ba38SHeiko Schocher		"bootcount" is stored in the environment. To prevent a
907eda0ba38SHeiko Schocher		saveenv on all reboots, the environment variable
908eda0ba38SHeiko Schocher		"upgrade_available" is used. If "upgrade_available" is
909eda0ba38SHeiko Schocher		0, "bootcount" is always 0, if "upgrade_available" is
910eda0ba38SHeiko Schocher		1 "bootcount" is incremented in the environment.
911eda0ba38SHeiko Schocher		So the Userspace Applikation must set the "upgrade_available"
912eda0ba38SHeiko Schocher		and "bootcount" variable to 0, if a boot was successfully.
913eda0ba38SHeiko Schocher
914c609719bSwdenk- Pre-Boot Commands:
915c609719bSwdenk		CONFIG_PREBOOT
916c609719bSwdenk
917c609719bSwdenk		When this option is #defined, the existence of the
918c609719bSwdenk		environment variable "preboot" will be checked
919c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
920c609719bSwdenk		countdown and/or running the auto-boot command resp.
921c609719bSwdenk		entering interactive mode.
922c609719bSwdenk
923c609719bSwdenk		This feature is especially useful when "preboot" is
924c609719bSwdenk		automatically generated or modified. For an example
925c609719bSwdenk		see the LWMON board specific code: here "preboot" is
926c609719bSwdenk		modified when the user holds down a certain
927c609719bSwdenk		combination of keys on the (special) keyboard when
928c609719bSwdenk		booting the systems
929c609719bSwdenk
930c609719bSwdenk- Serial Download Echo Mode:
931c609719bSwdenk		CONFIG_LOADS_ECHO
932c609719bSwdenk		If defined to 1, all characters received during a
933c609719bSwdenk		serial download (using the "loads" command) are
934c609719bSwdenk		echoed back. This might be needed by some terminal
935c609719bSwdenk		emulations (like "cu"), but may as well just take
936c609719bSwdenk		time on others. This setting #define's the initial
937c609719bSwdenk		value of the "loads_echo" environment variable.
938c609719bSwdenk
939602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
940c609719bSwdenk		CONFIG_KGDB_BAUDRATE
941c609719bSwdenk		Select one of the baudrates listed in
9426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
943c609719bSwdenk
944c609719bSwdenk- Monitor Functions:
945602ad3b3SJon Loeliger		Monitor commands can be included or excluded
946602ad3b3SJon Loeliger		from the build by using the #include files
947c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
948c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
949602ad3b3SJon Loeliger		and augmenting with additional #define's
950602ad3b3SJon Loeliger		for wanted commands.
951c609719bSwdenk
952602ad3b3SJon Loeliger		The default command configuration includes all commands
953602ad3b3SJon Loeliger		except those marked below with a "*".
954602ad3b3SJon Loeliger
955b401b73dSMarek Vasut		CONFIG_CMD_AES		  AES 128 CBC encrypt/decrypt
956602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
957602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
958602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
959602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
960602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
961602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
962602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
96308d0d6f3SMichal Simek		CONFIG_CMD_CLK   	* clock command support
964602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
965710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
966602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
967602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
968602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
969a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
970a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
971a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
972a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
973602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
974602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
975246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
976602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
977602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
9785e2b3e0cSJoe Hershberger		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
979fffad71bSJoe Hershberger		CONFIG_CMD_ENV_FLAGS	* display details about env flags
98088733e2cSAndrew Ruder		CONFIG_CMD_ENV_EXISTS	* check existence of env variable
9810c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
98203e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
98303e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
98416f4d933SStephen Warren		CONFIG_CMD_FS_GENERIC	* filesystem commands (e.g. load, ls)
98516f4d933SStephen Warren					  that work for multiple fs types
986bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
987602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
98803e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
989602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
990602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
9914d98b5c8SVincent Stehlé		CONFIG_CMD_FUSE		* Device fuse support
99253fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
993a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
994a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
995bf36c5d5SSimon Glass		CONFIG_CMD_HASH		* calculate hash / digest
996602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
997602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
998602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
999602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
10008fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS		  List all images found in NOR flash
10014d98b5c8SVincent Stehlé		CONFIG_CMD_IMLS_NAND	* List all images found in NAND flash
1002602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
1003aa53233aSSimon Glass		CONFIG_CMD_IOTRACE	* I/O tracing for debugging
10040c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
1005c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
1006602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
1007602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
1008602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
1009602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
10104d98b5c8SVincent Stehlé		CONFIG_CMD_LDRINFO	* ldrinfo (display Blackfin loader)
1011d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
1012d22c338eSJoe Hershberger					  (169.254.*.*)
1013602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
1014602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
10154d98b5c8SVincent Stehlé		CONFIG_CMD_MD5SUM	* print md5 message digest
101602c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
101715a33e49SSimon Glass		CONFIG_CMD_MEMINFO	* Display detailed memory information
1018602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
1019a2681707SWolfgang Denk					  loop, loopw
10204d98b5c8SVincent Stehlé		CONFIG_CMD_MEMTEST	* mtest
1021602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
1022602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
1023602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
102468d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
1025602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
1026602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
10274d98b5c8SVincent Stehlé		CONFIG_CMD_NFS		  NFS support
1028e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
1029e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
1030602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
1031602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
1032602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
1033602ad3b3SJon Loeliger					  host
1034602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
1035ff048ea9SKenneth Waters		CONFIG_CMD_READ		* Read raw data from partition
1036602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
1037602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
1038d304931fSSimon Glass		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
1039602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
1040602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
1041602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
1042602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
1043602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
1044602ad3b3SJon Loeliger					  (4xx only)
1045f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
10464d98b5c8SVincent Stehlé		CONFIG_CMD_SHA1SUM	* print sha1 memory digest
104702c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
10487d861d95SBob Liu		CONFIG_CMD_SOFTSWITCH	* Soft switch setting command for BF60x
104974de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
1050602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
10517a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
10521fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
1053da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
1054da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
1055602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
1056602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
1057c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
10584d98b5c8SVincent Stehlé		CONFIG_CMD_XIMG		  Load part of Multi Image
105989c8230dSPrzemyslaw Marczak		CONFIG_CMD_UUID		* Generate random UUID or GUID string
1060c609719bSwdenk
1061c609719bSwdenk		EXAMPLE: If you want all functions except of network
1062c609719bSwdenk		support you can write:
1063c609719bSwdenk
1064602ad3b3SJon Loeliger		#include "config_cmd_all.h"
1065602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
1066c609719bSwdenk
1067213bf8c8SGerald Van Baren	Other Commands:
1068213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
1069c609719bSwdenk
1070c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
1071602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
1072c609719bSwdenk		what you (and your U-Boot users) are doing. Data
1073c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
1074c609719bSwdenk		8260 (where accesses to the IMMR region must be
1075c609719bSwdenk		uncached), and it cannot be disabled on all other
1076c609719bSwdenk		systems where we (mis-) use the data cache to hold an
1077c609719bSwdenk		initial stack and some data.
1078c609719bSwdenk
1079c609719bSwdenk
1080c609719bSwdenk		XXX - this list needs to get updated!
1081c609719bSwdenk
1082a5ecbe62SWolfgang Denk- Regular expression support:
1083a5ecbe62SWolfgang Denk		CONFIG_REGEX
1084a5ecbe62SWolfgang Denk		If this variable is defined, U-Boot is linked against
1085a5ecbe62SWolfgang Denk		the SLRE (Super Light Regular Expression) library,
1086a5ecbe62SWolfgang Denk		which adds regex support to some commands, as for
1087a5ecbe62SWolfgang Denk		example "env grep" and "setexpr".
1088a5ecbe62SWolfgang Denk
108945ba8077SSimon Glass- Device tree:
109045ba8077SSimon Glass		CONFIG_OF_CONTROL
109145ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
109245ba8077SSimon Glass		to configure its devices, instead of relying on statically
109345ba8077SSimon Glass		compiled #defines in the board file. This option is
109445ba8077SSimon Glass		experimental and only available on a few boards. The device
109545ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
109645ba8077SSimon Glass
10972c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
10982c0f79e4SSimon Glass		be done using one of the two options below:
1099bbb0b128SSimon Glass
1100bbb0b128SSimon Glass		CONFIG_OF_EMBED
1101bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
1102bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
1103bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
1104bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
1105bbb0b128SSimon Glass		the global data structure as gd->blob.
110645ba8077SSimon Glass
11072c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
11082c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
11092c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
11102c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
11112c0f79e4SSimon Glass
11122c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
11132c0f79e4SSimon Glass
11142c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
11152c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
11162c0f79e4SSimon Glass		still use the individual files if you need something more
11172c0f79e4SSimon Glass		exotic.
11182c0f79e4SSimon Glass
1119c609719bSwdenk- Watchdog:
1120c609719bSwdenk		CONFIG_WATCHDOG
1121c609719bSwdenk		If this variable is defined, it enables watchdog
11226abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
11236abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
11246abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
11256abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
11266abe6fb6SDetlev Zundel		available, then no further board specific code should
11276abe6fb6SDetlev Zundel		be needed to use it.
11286abe6fb6SDetlev Zundel
11296abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
11306abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
11316abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
11326abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
1133c609719bSwdenk
1134c1551ea8Sstroese- U-Boot Version:
1135c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
1136c1551ea8Sstroese		If this variable is defined, an environment variable
1137c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
1138c1551ea8Sstroese		version as printed by the "version" command.
1139a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
1140a1ea8e51SBenoît Thébaudeau		next reset.
1141c1551ea8Sstroese
1142c609719bSwdenk- Real-Time Clock:
1143c609719bSwdenk
1144602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
1145c609719bSwdenk		has to be selected, too. Define exactly one of the
1146c609719bSwdenk		following options:
1147c609719bSwdenk
1148c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
1149c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
11504e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
1151c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
11521cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
1153c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
11547f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
11553bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
11569536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
11574c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
11586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
115971d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
116071d19f30SHeiko Schocher					  RV3029 RTC.
1161c609719bSwdenk
1162b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
1163b37c7e5eSwdenk		must also be configured. See I2C Support, below.
1164b37c7e5eSwdenk
1165e92739d3SPeter Tyser- GPIO Support:
1166e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
1167e92739d3SPeter Tyser
11685dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
11695dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
11705dec49caSChris Packham		pins supported by a particular chip.
11715dec49caSChris Packham
1172e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
1173e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
1174e92739d3SPeter Tyser
1175aa53233aSSimon Glass- I/O tracing:
1176aa53233aSSimon Glass		When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O
1177aa53233aSSimon Glass		accesses and can checksum them or write a list of them out
1178aa53233aSSimon Glass		to memory. See the 'iotrace' command for details. This is
1179aa53233aSSimon Glass		useful for testing device drivers since it can confirm that
1180aa53233aSSimon Glass		the driver behaves the same way before and after a code
1181aa53233aSSimon Glass		change. Currently this is supported on sandbox and arm. To
1182aa53233aSSimon Glass		add support for your architecture, add '#include <iotrace.h>'
1183aa53233aSSimon Glass		to the bottom of arch/<arch>/include/asm/io.h and test.
1184aa53233aSSimon Glass
1185aa53233aSSimon Glass		Example output from the 'iotrace stats' command is below.
1186aa53233aSSimon Glass		Note that if the trace buffer is exhausted, the checksum will
1187aa53233aSSimon Glass		still continue to operate.
1188aa53233aSSimon Glass
1189aa53233aSSimon Glass			iotrace is enabled
1190aa53233aSSimon Glass			Start:  10000000	(buffer start address)
1191aa53233aSSimon Glass			Size:   00010000	(buffer size)
1192aa53233aSSimon Glass			Offset: 00000120	(current buffer offset)
1193aa53233aSSimon Glass			Output: 10000120	(start + offset)
1194aa53233aSSimon Glass			Count:  00000018	(number of trace records)
1195aa53233aSSimon Glass			CRC32:  9526fb66	(CRC32 of all trace records)
1196aa53233aSSimon Glass
1197c609719bSwdenk- Timestamp Support:
1198c609719bSwdenk
1199c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
1200c609719bSwdenk		(date and time) of an image is printed by image
1201c609719bSwdenk		commands like bootm or iminfo. This option is
1202602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1203c609719bSwdenk
1204923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1205923c46f9SKarl O. Pinc		Zero or more of the following:
1206923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1207923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1208923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1209923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1210923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1211923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1212923c46f9SKarl O. Pinc				       disk/part_efi.c
1213923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1214c609719bSwdenk
1215602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1216218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1217923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1218c609719bSwdenk
1219c609719bSwdenk- IDE Reset method:
12204d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
12214d13cbadSwdenk		board configurations files but used nowhere!
1222c609719bSwdenk
12234d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
12244d13cbadSwdenk		be performed by calling the function
12254d13cbadSwdenk			ide_set_reset(int reset)
12264d13cbadSwdenk		which has to be defined in a board specific file
1227c609719bSwdenk
1228c609719bSwdenk- ATAPI Support:
1229c609719bSwdenk		CONFIG_ATAPI
1230c609719bSwdenk
1231c609719bSwdenk		Set this to enable ATAPI support.
1232c609719bSwdenk
1233c40b2956Swdenk- LBA48 Support
1234c40b2956Swdenk		CONFIG_LBA48
1235c40b2956Swdenk
1236c40b2956Swdenk		Set this to enable support for disks larger than 137GB
12374b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1238c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1239c40b2956Swdenk		support disks up to 2.1TB.
1240c40b2956Swdenk
12416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1242c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1243c40b2956Swdenk			Default is 32bit.
1244c40b2956Swdenk
1245c609719bSwdenk- SCSI Support:
1246c609719bSwdenk		At the moment only there is only support for the
1247c609719bSwdenk		SYM53C8XX SCSI controller; define
1248c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1249c609719bSwdenk
12506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
12516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
12526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1253c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1254c609719bSwdenk		devices.
12556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1256c609719bSwdenk
1257447c031bSStefan Reinauer		The environment variable 'scsidevs' is set to the number of
1258447c031bSStefan Reinauer		SCSI devices found during the last scan.
1259447c031bSStefan Reinauer
1260c609719bSwdenk- NETWORK Support (PCI):
1261682011ffSwdenk		CONFIG_E1000
1262ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1263ce5207e1SKyle Moffett
1264ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1265ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1266ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1267ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1268ce5207e1SKyle Moffett
1269ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1270ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1271ce5207e1SKyle Moffett		example with the "sspi" command.
1272ce5207e1SKyle Moffett
1273ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1274ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1275ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1276682011ffSwdenk
1277ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
127811ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1279ac3315c2SAndre Schwarz
1280c609719bSwdenk		CONFIG_EEPRO100
1281c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
128211ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1283c609719bSwdenk		write routine for first time initialisation.
1284c609719bSwdenk
1285c609719bSwdenk		CONFIG_TULIP
1286c609719bSwdenk		Support for Digital 2114x chips.
1287c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1288c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1289c609719bSwdenk
1290c609719bSwdenk		CONFIG_NATSEMI
1291c609719bSwdenk		Support for National dp83815 chips.
1292c609719bSwdenk
1293c609719bSwdenk		CONFIG_NS8382X
1294c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1295c609719bSwdenk
129645219c46Swdenk- NETWORK Support (other):
129745219c46Swdenk
1298c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1299c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1300c041e9d2SJens Scharsig
1301c041e9d2SJens Scharsig			CONFIG_RMII
1302c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1303c041e9d2SJens Scharsig
1304c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1305c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1306c041e9d2SJens Scharsig			The driver doen't show link status messages.
1307c041e9d2SJens Scharsig
1308efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1309efdd7319SRob Herring		Support for the Calxeda XGMAC device
1310efdd7319SRob Herring
13113bb46d23SAshok		CONFIG_LAN91C96
131245219c46Swdenk		Support for SMSC's LAN91C96 chips.
131345219c46Swdenk
131445219c46Swdenk			CONFIG_LAN91C96_BASE
131545219c46Swdenk			Define this to hold the physical address
131645219c46Swdenk			of the LAN91C96's I/O space
131745219c46Swdenk
131845219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
131945219c46Swdenk			Define this to enable 32 bit addressing
132045219c46Swdenk
13213bb46d23SAshok		CONFIG_SMC91111
1322f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1323f39748aeSwdenk
1324f39748aeSwdenk			CONFIG_SMC91111_BASE
1325f39748aeSwdenk			Define this to hold the physical address
1326f39748aeSwdenk			of the device (I/O space)
1327f39748aeSwdenk
1328f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1329f39748aeSwdenk			Define this if data bus is 32 bits
1330f39748aeSwdenk
1331f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1332f39748aeSwdenk			Define this to use i/o functions instead of macros
1333f39748aeSwdenk			(some hardware wont work with macros)
1334f39748aeSwdenk
1335dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1336dc02badaSHeiko Schocher		Support for davinci emac
1337dc02badaSHeiko Schocher
1338dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1339dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1340dc02badaSHeiko Schocher
1341b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1342b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1343b3dbf4a5SMacpaul Lin
1344b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1345b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1346b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1347b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1348b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1349b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1350b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1351b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1352b3dbf4a5SMacpaul Lin
1353c2fff331SMike Rapoport		CONFIG_SMC911X
1354557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1355557b377dSJens Gehrlein
1356c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1357557b377dSJens Gehrlein			Define this to hold the physical address
1358557b377dSJens Gehrlein			of the device (I/O space)
1359557b377dSJens Gehrlein
1360c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1361557b377dSJens Gehrlein			Define this if data bus is 32 bits
1362557b377dSJens Gehrlein
1363c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1364557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1365557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1366c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1367557b377dSJens Gehrlein
13683d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
13693d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
13703d0075faSYoshihiro Shimoda
13713d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
13723d0075faSYoshihiro Shimoda			Define the number of ports to be used
13733d0075faSYoshihiro Shimoda
13743d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
13753d0075faSYoshihiro Shimoda			Define the ETH PHY's address
13763d0075faSYoshihiro Shimoda
137768260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
137868260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
137968260aabSYoshihiro Shimoda
13805e124724SVadim Bendebury- TPM Support:
138190899cc0SChe-liang Chiou		CONFIG_TPM
138290899cc0SChe-liang Chiou		Support TPM devices.
138390899cc0SChe-liang Chiou
13841b393db5STom Wai-Hong Tam		CONFIG_TPM_TIS_I2C
13851b393db5STom Wai-Hong Tam		Support for i2c bus TPM devices. Only one device
13861b393db5STom Wai-Hong Tam		per system is supported at this time.
13871b393db5STom Wai-Hong Tam
13881b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BUS_NUMBER
13891b393db5STom Wai-Hong Tam			Define the the i2c bus number for the TPM device
13901b393db5STom Wai-Hong Tam
13911b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
13921b393db5STom Wai-Hong Tam			Define the TPM's address on the i2c bus
13931b393db5STom Wai-Hong Tam
13941b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BURST_LIMITATION
13951b393db5STom Wai-Hong Tam			Define the burst count bytes upper limit
13961b393db5STom Wai-Hong Tam
1397c01939c7SDirk Eibach		CONFIG_TPM_ATMEL_TWI
1398c01939c7SDirk Eibach		Support for Atmel TWI TPM device. Requires I2C support.
1399c01939c7SDirk Eibach
140090899cc0SChe-liang Chiou		CONFIG_TPM_TIS_LPC
14015e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
14025e124724SVadim Bendebury		per system is supported at this time.
14035e124724SVadim Bendebury
14045e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
14055e124724SVadim Bendebury			Base address where the generic TPM device is mapped
14065e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
14075e124724SVadim Bendebury			0xfed40000.
14085e124724SVadim Bendebury
1409be6c1529SReinhard Pfau		CONFIG_CMD_TPM
1410be6c1529SReinhard Pfau		Add tpm monitor functions.
1411be6c1529SReinhard Pfau		Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
1412be6c1529SReinhard Pfau		provides monitor access to authorized functions.
1413be6c1529SReinhard Pfau
1414be6c1529SReinhard Pfau		CONFIG_TPM
1415be6c1529SReinhard Pfau		Define this to enable the TPM support library which provides
1416be6c1529SReinhard Pfau		functional interfaces to some TPM commands.
1417be6c1529SReinhard Pfau		Requires support for a TPM device.
1418be6c1529SReinhard Pfau
1419be6c1529SReinhard Pfau		CONFIG_TPM_AUTH_SESSIONS
1420be6c1529SReinhard Pfau		Define this to enable authorized functions in the TPM library.
1421be6c1529SReinhard Pfau		Requires CONFIG_TPM and CONFIG_SHA1.
1422be6c1529SReinhard Pfau
1423c609719bSwdenk- USB Support:
1424c609719bSwdenk		At the moment only the UHCI host controller is
14254d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1426c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1427c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
142830d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1429c609719bSwdenk		storage devices.
1430c609719bSwdenk		Note:
1431c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1432c609719bSwdenk		(TEAC FD-05PUB).
14334d13cbadSwdenk		MPC5200 USB requires additional defines:
14344d13cbadSwdenk			CONFIG_USB_CLOCK
14354d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1436307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1437307ecb6dSEric Millbrandt				for USB on PSC3
14384d13cbadSwdenk			CONFIG_USB_CONFIG
14394d13cbadSwdenk				for differential drivers: 0x00001000
14404d13cbadSwdenk				for single ended drivers: 0x00005000
1441307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1442307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
14436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1444fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1445fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
14464d13cbadSwdenk
14479ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
14489ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
14499ab4ce22SSimon Glass
145016c8d5e7SWolfgang Denk- USB Device:
145116c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
145216c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
145316c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
145411ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
145516c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
145616c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
145716c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
145816c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
145916c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
146016c8d5e7SWolfgang Denk		a Linux host by
146116c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
146216c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
146316c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
146416c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
146516c8d5e7SWolfgang Denk
146616c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
146716c8d5e7SWolfgang Denk			Define this to build a UDC device
146816c8d5e7SWolfgang Denk
146916c8d5e7SWolfgang Denk			CONFIG_USB_TTY
147016c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
147116c8d5e7SWolfgang Denk			talk to the UDC device
147216c8d5e7SWolfgang Denk
1473f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1474f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1475f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1476f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1477f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1478f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1479f9da0f89SVipin KUMAR			speed.
1480f9da0f89SVipin KUMAR
14816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
148216c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
148316c8d5e7SWolfgang Denk			be set to usbtty.
148416c8d5e7SWolfgang Denk
148516c8d5e7SWolfgang Denk			mpc8xx:
14866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
148716c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
14886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
148916c8d5e7SWolfgang Denk
14906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
149116c8d5e7SWolfgang Denk				Derive USB clock from brgclk
14926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
149316c8d5e7SWolfgang Denk
149416c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
149516c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
149616c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
149716c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
149816c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
149916c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
150016c8d5e7SWolfgang Denk
150116c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
150216c8d5e7SWolfgang Denk			Define this string as the name of your company for
150316c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
150416c8d5e7SWolfgang Denk
150516c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
150616c8d5e7SWolfgang Denk			Define this string as the name of your product
150716c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
150816c8d5e7SWolfgang Denk
150916c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
151016c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
151116c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
151216c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
151316c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
151416c8d5e7SWolfgang Denk
151516c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
151616c8d5e7SWolfgang Denk			Define this as the unique Product ID
151716c8d5e7SWolfgang Denk			for your device
151816c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1519c609719bSwdenk
1520d70a560fSIgor Grinberg- ULPI Layer Support:
1521d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1522d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1523d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1524d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1525d70a560fSIgor Grinberg		viewport is supported.
1526d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1527d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
15286d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
15296d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
15306d365ea0SLucas Stach		the appropriate value in Hz.
1531c609719bSwdenk
1532c609719bSwdenk- MMC Support:
1533c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1534c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1535c609719bSwdenk		accessed from the boot prompt by mapping the device
1536c609719bSwdenk		to physical memory similar to flash. Command line is
1537602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1538602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1539c609719bSwdenk
1540afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1541afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1542afb35666SYoshihiro Shimoda
1543afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1544afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1545afb35666SYoshihiro Shimoda
1546afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1547afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1548afb35666SYoshihiro Shimoda
15491fd93c6eSPierre Aubert		CONFIG_GENERIC_MMC
15501fd93c6eSPierre Aubert		Enable the generic MMC driver
15511fd93c6eSPierre Aubert
15521fd93c6eSPierre Aubert		CONFIG_SUPPORT_EMMC_BOOT
15531fd93c6eSPierre Aubert		Enable some additional features of the eMMC boot partitions.
15541fd93c6eSPierre Aubert
15551fd93c6eSPierre Aubert		CONFIG_SUPPORT_EMMC_RPMB
15561fd93c6eSPierre Aubert		Enable the commands for reading, writing and programming the
15571fd93c6eSPierre Aubert		key for the Replay Protection Memory Block partition in eMMC.
15581fd93c6eSPierre Aubert
1559b3ba6e94STom Rini- USB Device Firmware Update (DFU) class support:
1560b3ba6e94STom Rini		CONFIG_DFU_FUNCTION
1561b3ba6e94STom Rini		This enables the USB portion of the DFU USB class
1562b3ba6e94STom Rini
1563b3ba6e94STom Rini		CONFIG_CMD_DFU
1564b3ba6e94STom Rini		This enables the command "dfu" which is used to have
1565b3ba6e94STom Rini		U-Boot create a DFU class device via USB.  This command
1566b3ba6e94STom Rini		requires that the "dfu_alt_info" environment variable be
1567b3ba6e94STom Rini		set and define the alt settings to expose to the host.
1568b3ba6e94STom Rini
1569b3ba6e94STom Rini		CONFIG_DFU_MMC
1570b3ba6e94STom Rini		This enables support for exposing (e)MMC devices via DFU.
1571b3ba6e94STom Rini
1572c6631764SPantelis Antoniou		CONFIG_DFU_NAND
1573c6631764SPantelis Antoniou		This enables support for exposing NAND devices via DFU.
1574c6631764SPantelis Antoniou
1575a9479f04SAfzal Mohammed		CONFIG_DFU_RAM
1576a9479f04SAfzal Mohammed		This enables support for exposing RAM via DFU.
1577a9479f04SAfzal Mohammed		Note: DFU spec refer to non-volatile memory usage, but
1578a9479f04SAfzal Mohammed		allow usages beyond the scope of spec - here RAM usage,
1579a9479f04SAfzal Mohammed		one that would help mostly the developer.
1580a9479f04SAfzal Mohammed
1581e7e75c70SHeiko Schocher		CONFIG_SYS_DFU_DATA_BUF_SIZE
1582e7e75c70SHeiko Schocher		Dfu transfer uses a buffer before writing data to the
1583e7e75c70SHeiko Schocher		raw storage device. Make the size (in bytes) of this buffer
1584e7e75c70SHeiko Schocher		configurable. The size of this buffer is also configurable
1585e7e75c70SHeiko Schocher		through the "dfu_bufsiz" environment variable.
1586e7e75c70SHeiko Schocher
1587ea2453d5SPantelis Antoniou		CONFIG_SYS_DFU_MAX_FILE_SIZE
1588ea2453d5SPantelis Antoniou		When updating files rather than the raw storage device,
1589ea2453d5SPantelis Antoniou		we use a static buffer to copy the file into and then write
1590ea2453d5SPantelis Antoniou		the buffer once we've been given the whole file.  Define
1591ea2453d5SPantelis Antoniou		this to the maximum filesize (in bytes) for the buffer.
1592ea2453d5SPantelis Antoniou		Default is 4 MiB if undefined.
1593ea2453d5SPantelis Antoniou
1594001a8319SHeiko Schocher		DFU_DEFAULT_POLL_TIMEOUT
1595001a8319SHeiko Schocher		Poll timeout [ms], is the timeout a device can send to the
1596001a8319SHeiko Schocher		host. The host must wait for this timeout before sending
1597001a8319SHeiko Schocher		a subsequent DFU_GET_STATUS request to the device.
1598001a8319SHeiko Schocher
1599001a8319SHeiko Schocher		DFU_MANIFEST_POLL_TIMEOUT
1600001a8319SHeiko Schocher		Poll timeout [ms], which the device sends to the host when
1601001a8319SHeiko Schocher		entering dfuMANIFEST state. Host waits this timeout, before
1602001a8319SHeiko Schocher		sending again an USB request to the device.
1603001a8319SHeiko Schocher
16043aab70afSSebastian Siewior- USB Device Android Fastboot support:
16053aab70afSSebastian Siewior		CONFIG_CMD_FASTBOOT
16063aab70afSSebastian Siewior		This enables the command "fastboot" which enables the Android
16073aab70afSSebastian Siewior		fastboot mode for the platform's USB device. Fastboot is a USB
16083aab70afSSebastian Siewior		protocol for downloading images, flashing and device control
16093aab70afSSebastian Siewior		used on Android devices.
16103aab70afSSebastian Siewior		See doc/README.android-fastboot for more information.
16113aab70afSSebastian Siewior
16123aab70afSSebastian Siewior		CONFIG_ANDROID_BOOT_IMAGE
16133aab70afSSebastian Siewior		This enables support for booting images which use the Android
16143aab70afSSebastian Siewior		image format header.
16153aab70afSSebastian Siewior
16163aab70afSSebastian Siewior		CONFIG_USB_FASTBOOT_BUF_ADDR
16173aab70afSSebastian Siewior		The fastboot protocol requires a large memory buffer for
16183aab70afSSebastian Siewior		downloads. Define this to the starting RAM address to use for
16193aab70afSSebastian Siewior		downloaded images.
16203aab70afSSebastian Siewior
16213aab70afSSebastian Siewior		CONFIG_USB_FASTBOOT_BUF_SIZE
16223aab70afSSebastian Siewior		The fastboot protocol requires a large memory buffer for
16233aab70afSSebastian Siewior		downloads. This buffer should be as large as possible for a
16243aab70afSSebastian Siewior		platform. Define this to the size available RAM for fastboot.
16253aab70afSSebastian Siewior
16266705d81eSwdenk- Journaling Flash filesystem support:
16276705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
16286705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
16296705d81eSwdenk		Define these for a default partition on a NAND device
16306705d81eSwdenk
16316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
16326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
16336705d81eSwdenk		Define these for a default partition on a NOR device
16346705d81eSwdenk
16356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
16366705d81eSwdenk		Define this to create an own partition. You have to provide a
16376705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
16386705d81eSwdenk
16396705d81eSwdenk		If you define only one JFFS2 partition you may also want to
16406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
16416705d81eSwdenk		to disable the command chpart. This is the default when you
16426705d81eSwdenk		have not defined a custom partition
16436705d81eSwdenk
1644c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1645c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1646656f4c65SDonggeun Kim
1647656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1648656f4c65SDonggeun Kim		file in FAT formatted partition.
1649656f4c65SDonggeun Kim
1650656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1651656f4c65SDonggeun Kim		user to write files to FAT.
1652c30a15e5SDonggeun Kim
165384cd9327SGabe BlackCBFS (Coreboot Filesystem) support
165484cd9327SGabe Black		CONFIG_CMD_CBFS
165584cd9327SGabe Black
165684cd9327SGabe Black		Define this to enable support for reading from a Coreboot
165784cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
165884cd9327SGabe Black		and cbfsload.
165984cd9327SGabe Black
16604f0d1a2aSSiva Durga Prasad Paladugu- FAT(File Allocation Table) filesystem cluster size:
16614f0d1a2aSSiva Durga Prasad Paladugu		CONFIG_FS_FAT_MAX_CLUSTSIZE
16624f0d1a2aSSiva Durga Prasad Paladugu
16634f0d1a2aSSiva Durga Prasad Paladugu		Define the max cluster size for fat operations else
16644f0d1a2aSSiva Durga Prasad Paladugu		a default value of 65536 will be defined.
16654f0d1a2aSSiva Durga Prasad Paladugu
1666c609719bSwdenk- Keyboard Support:
1667c609719bSwdenk		CONFIG_ISA_KEYBOARD
1668c609719bSwdenk
1669c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1670c609719bSwdenk		support
1671c609719bSwdenk
1672c609719bSwdenk		CONFIG_I8042_KBD
1673c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1674c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1675c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1676c609719bSwdenk		for cfb_console. Supports cursor blinking.
1677c609719bSwdenk
1678713cb680SHung-ying Tyan		CONFIG_CROS_EC_KEYB
1679713cb680SHung-ying Tyan		Enables a Chrome OS keyboard using the CROS_EC interface.
1680713cb680SHung-ying Tyan		This uses CROS_EC to communicate with a second microcontroller
1681713cb680SHung-ying Tyan		which provides key scans on request.
1682713cb680SHung-ying Tyan
1683c609719bSwdenk- Video support:
1684c609719bSwdenk		CONFIG_VIDEO
1685c609719bSwdenk
1686c609719bSwdenk		Define this to enable video support (for output to
1687c609719bSwdenk		video).
1688c609719bSwdenk
1689c609719bSwdenk		CONFIG_VIDEO_CT69000
1690c609719bSwdenk
1691c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1692c609719bSwdenk
1693c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1694eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1695eeb1b77bSwdenk		video output is selected via environment 'videoout'
1696eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1697eeb1b77bSwdenk		assumed.
1698c609719bSwdenk
1699eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
170011ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1701eeb1b77bSwdenk		are possible:
1702eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1703eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1704eeb1b77bSwdenk
1705eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1706eeb1b77bSwdenk		-------------+---------------------------------------------
1707eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1708eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1709eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1710eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1711eeb1b77bSwdenk		-------------+---------------------------------------------
1712c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1713c609719bSwdenk
1714eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
17157817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1716eeb1b77bSwdenk
1717eeb1b77bSwdenk
1718a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1719a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1720a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1721a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1722a6c7ad2fSwdenk
17237d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
17247d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
17257d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
17267d3053fbSTimur Tabi		support, and should also define these other macros:
17277d3053fbSTimur Tabi
17287d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
17297d3053fbSTimur Tabi			CONFIG_VIDEO
17307d3053fbSTimur Tabi			CONFIG_CMD_BMP
17317d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
17327d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
17337d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
17347d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
17357d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
17367d3053fbSTimur Tabi
1737ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1738ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1739ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1740ba8e76bdSTimur Tabi		description of this variable.
17417d3053fbSTimur Tabi
1742058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1743058d59b0SSimon Glass
1744058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1745058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1746058d59b0SSimon Glass		driver.
1747058d59b0SSimon Glass
1748058d59b0SSimon Glass
1749682011ffSwdenk- Keyboard Support:
1750682011ffSwdenk		CONFIG_KEYBOARD
1751682011ffSwdenk
1752682011ffSwdenk		Define this to enable a custom keyboard support.
1753682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1754682011ffSwdenk		defined in your board-specific files.
1755682011ffSwdenk		The only board using this so far is RBC823.
1756a6c7ad2fSwdenk
1757c609719bSwdenk- LCD Support:	CONFIG_LCD
1758c609719bSwdenk
1759c609719bSwdenk		Define this to enable LCD support (for output to LCD
1760c609719bSwdenk		display); also select one of the supported displays
1761c609719bSwdenk		by defining one of these:
1762c609719bSwdenk
176339cf4804SStelian Pop		CONFIG_ATMEL_LCD:
176439cf4804SStelian Pop
176539cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
176639cf4804SStelian Pop
1767fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1768c609719bSwdenk
1769fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1770c609719bSwdenk
1771fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1772c609719bSwdenk
1773fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1774fd3103bbSwdenk			Active, color, single scan.
1775fd3103bbSwdenk
1776fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1777fd3103bbSwdenk
1778fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1779c609719bSwdenk			Active, color, single scan.
1780c609719bSwdenk
1781c609719bSwdenk		CONFIG_SHARP_16x9
1782c609719bSwdenk
1783c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1784c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1785c609719bSwdenk
1786c609719bSwdenk		CONFIG_SHARP_LQ64D341
1787c609719bSwdenk
1788c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1789c609719bSwdenk			Active, color, single scan.
1790c609719bSwdenk
1791c609719bSwdenk		CONFIG_HLD1045
1792c609719bSwdenk
1793c609719bSwdenk			HLD1045 display, 640x480.
1794c609719bSwdenk			Active, color, single scan.
1795c609719bSwdenk
1796c609719bSwdenk		CONFIG_OPTREX_BW
1797c609719bSwdenk
1798c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1799c609719bSwdenk			or
1800c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1801c609719bSwdenk			or
1802c609719bSwdenk			Hitachi	 SP14Q002
1803c609719bSwdenk
1804c609719bSwdenk			320x240. Black & white.
1805c609719bSwdenk
1806c609719bSwdenk		Normally display is black on white background; define
18076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1808c609719bSwdenk
1809676d319eSSimon Glass		CONFIG_LCD_ALIGNMENT
1810676d319eSSimon Glass
1811676d319eSSimon Glass		Normally the LCD is page-aligned (tyically 4KB). If this is
1812676d319eSSimon Glass		defined then the LCD will be aligned to this value instead.
1813676d319eSSimon Glass		For ARM it is sometimes useful to use MMU_SECTION_SIZE
1814676d319eSSimon Glass		here, since it is cheaper to change data cache settings on
1815676d319eSSimon Glass		a per-section basis.
1816676d319eSSimon Glass
18170d89efefSSimon Glass		CONFIG_CONSOLE_SCROLL_LINES
18180d89efefSSimon Glass
18190d89efefSSimon Glass		When the console need to be scrolled, this is the number of
18200d89efefSSimon Glass		lines to scroll by. It defaults to 1. Increasing this makes
18210d89efefSSimon Glass		the console jump but can help speed up operation when scrolling
18220d89efefSSimon Glass		is slow.
1823676d319eSSimon Glass
182445d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
182545d7f525STom Wai-Hong Tam
182645d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
182745d7f525STom Wai-Hong Tam
1828735987c5STom Wai-Hong Tam		CONFIG_I2C_EDID
1829735987c5STom Wai-Hong Tam
1830735987c5STom Wai-Hong Tam		Enables an 'i2c edid' command which can read EDID
1831735987c5STom Wai-Hong Tam		information over I2C from an attached LCD display.
1832735987c5STom Wai-Hong Tam
18337152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1834d791b1dcSwdenk
1835d791b1dcSwdenk		If this option is set, the environment is checked for
1836d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1837d791b1dcSwdenk		of logo, copyright and system information on the LCD
1838e94d2cd9Swdenk		is suppressed and the BMP image at the address
1839d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1840d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1841d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1842d791b1dcSwdenk		loaded very quickly after power-on.
1843d791b1dcSwdenk
1844c0880485SNikita Kiryanov		CONFIG_SPLASHIMAGE_GUARD
1845c0880485SNikita Kiryanov
1846c0880485SNikita Kiryanov		If this option is set, then U-Boot will prevent the environment
1847c0880485SNikita Kiryanov		variable "splashimage" from being set to a problematic address
18481551df35STom Rini		(see README.displaying-bmps).
1849c0880485SNikita Kiryanov		This option is useful for targets where, due to alignment
1850c0880485SNikita Kiryanov		restrictions, an improperly aligned BMP image will cause a data
1851c0880485SNikita Kiryanov		abort. If you think you will not have problems with unaligned
1852c0880485SNikita Kiryanov		accesses (for example because your toolchain prevents them)
1853c0880485SNikita Kiryanov		there is no need to set this option.
1854c0880485SNikita Kiryanov
18551ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
18561ca298ceSMatthias Weisser
18571ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
18581ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
18591ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
18601ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
18611ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
18621ca298ceSMatthias Weisser		specify 'm' for centering the image.
18631ca298ceSMatthias Weisser
18641ca298ceSMatthias Weisser		Example:
18651ca298ceSMatthias Weisser		setenv splashpos m,m
18661ca298ceSMatthias Weisser			=> image at center of screen
18671ca298ceSMatthias Weisser
18681ca298ceSMatthias Weisser		setenv splashpos 30,20
18691ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
18701ca298ceSMatthias Weisser
18711ca298ceSMatthias Weisser		setenv splashpos -10,m
18721ca298ceSMatthias Weisser			=> vertically centered image
18731ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
18741ca298ceSMatthias Weisser
187598f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
187698f4a3dfSStefan Roese
187798f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
187898f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
187998f4a3dfSStefan Roese		splashscreen support or the bmp command.
188098f4a3dfSStefan Roese
1881d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1882d5011762SAnatolij Gustschin
1883d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1884d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1885d5011762SAnatolij Gustschin		bmp command.
1886d5011762SAnatolij Gustschin
1887f2b96dfbSLei Wen- Do compresssing for memory range:
1888f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1889f2b96dfbSLei Wen
1890f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1891f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1892f2b96dfbSLei Wen
1893c29fdfc1Swdenk- Compression support:
18948ef70478SKees Cook		CONFIG_GZIP
18958ef70478SKees Cook
18968ef70478SKees Cook		Enabled by default to support gzip compressed images.
18978ef70478SKees Cook
1898c29fdfc1Swdenk		CONFIG_BZIP2
1899c29fdfc1Swdenk
1900c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1901c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1902c29fdfc1Swdenk		compressed images are supported.
1903c29fdfc1Swdenk
1904c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
19056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1906c29fdfc1Swdenk		be at least 4MB.
1907d791b1dcSwdenk
1908fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1909fc9c1727SLuigi 'Comio' Mantellini
1910fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1911fc9c1727SLuigi 'Comio' Mantellini		images is included.
1912fc9c1727SLuigi 'Comio' Mantellini
1913fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1914fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1915fc9c1727SLuigi 'Comio' Mantellini		formula:
1916fc9c1727SLuigi 'Comio' Mantellini
1917fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1918fc9c1727SLuigi 'Comio' Mantellini
1919fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1920fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1921fc9c1727SLuigi 'Comio' Mantellini
1922fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1923fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1924fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1925fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1926fc9c1727SLuigi 'Comio' Mantellini
1927fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1928fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
19296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1930fc9c1727SLuigi 'Comio' Mantellini
19318ef70478SKees Cook		CONFIG_LZO
19328ef70478SKees Cook
19338ef70478SKees Cook		If this option is set, support for LZO compressed images
19348ef70478SKees Cook		is included.
19358ef70478SKees Cook
193617ea1177Swdenk- MII/PHY support:
193717ea1177Swdenk		CONFIG_PHY_ADDR
193817ea1177Swdenk
193917ea1177Swdenk		The address of PHY on MII bus.
194017ea1177Swdenk
194117ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
194217ea1177Swdenk
194317ea1177Swdenk		The clock frequency of the MII bus
194417ea1177Swdenk
194517ea1177Swdenk		CONFIG_PHY_GIGE
194617ea1177Swdenk
194717ea1177Swdenk		If this option is set, support for speed/duplex
194811ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
194917ea1177Swdenk
195017ea1177Swdenk		CONFIG_PHY_RESET_DELAY
195117ea1177Swdenk
195217ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
195317ea1177Swdenk		reset before any MII register access is possible.
195417ea1177Swdenk		For such PHY, set this option to the usec delay
195517ea1177Swdenk		required. (minimum 300usec for LXT971A)
195617ea1177Swdenk
195717ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
195817ea1177Swdenk
195917ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
196017ea1177Swdenk		command issued before MII status register can be read
196117ea1177Swdenk
1962c609719bSwdenk- Ethernet address:
1963c609719bSwdenk		CONFIG_ETHADDR
1964c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1965c609719bSwdenk		CONFIG_ETH2ADDR
1966c609719bSwdenk		CONFIG_ETH3ADDR
1967c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1968c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1969c609719bSwdenk
197011ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
197111ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1972c609719bSwdenk		is not determined automatically.
1973c609719bSwdenk
1974c609719bSwdenk- IP address:
1975c609719bSwdenk		CONFIG_IPADDR
1976c609719bSwdenk
1977c609719bSwdenk		Define a default value for the IP address to use for
197811ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1979c609719bSwdenk		determined through e.g. bootp.
19801ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1981c609719bSwdenk
1982c609719bSwdenk- Server IP address:
1983c609719bSwdenk		CONFIG_SERVERIP
1984c609719bSwdenk
1985c609719bSwdenk		Defines a default value for the IP address of a TFTP
1986c609719bSwdenk		server to contact when using the "tftboot" command.
19871ebcd654SWolfgang Denk		(Environment variable "serverip")
1988c609719bSwdenk
198997cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
199097cfe861SRobin Getz
199197cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
199297cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
199397cfe861SRobin Getz
19941ebcd654SWolfgang Denk- Gateway IP address:
19951ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
19961ebcd654SWolfgang Denk
19971ebcd654SWolfgang Denk		Defines a default value for the IP address of the
19981ebcd654SWolfgang Denk		default router where packets to other networks are
19991ebcd654SWolfgang Denk		sent to.
20001ebcd654SWolfgang Denk		(Environment variable "gatewayip")
20011ebcd654SWolfgang Denk
20021ebcd654SWolfgang Denk- Subnet mask:
20031ebcd654SWolfgang Denk		CONFIG_NETMASK
20041ebcd654SWolfgang Denk
20051ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
20061ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
20071ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
20081ebcd654SWolfgang Denk		forwarded through a router.
20091ebcd654SWolfgang Denk		(Environment variable "netmask")
20101ebcd654SWolfgang Denk
201153a5c424SDavid Updegraff- Multicast TFTP Mode:
201253a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
201353a5c424SDavid Updegraff
201453a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
201553a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
201611ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
201753a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
201853a5c424SDavid Updegraff		multicast group.
201953a5c424SDavid Updegraff
2020c609719bSwdenk- BOOTP Recovery Mode:
2021c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
2022c609719bSwdenk
2023c609719bSwdenk		If you have many targets in a network that try to
2024c609719bSwdenk		boot using BOOTP, you may want to avoid that all
2025c609719bSwdenk		systems send out BOOTP requests at precisely the same
2026c609719bSwdenk		moment (which would happen for instance at recovery
2027c609719bSwdenk		from a power failure, when all systems will try to
2028c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
2029c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
2030c609719bSwdenk		inserted before sending out BOOTP requests. The
20316c33c785SWolfgang Denk		following delays are inserted then:
2032c609719bSwdenk
2033c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
2034c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
2035c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
2036c609719bSwdenk		4th and following
2037c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
2038c609719bSwdenk
2039fe389a82Sstroese- DHCP Advanced Options:
20401fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
20411fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
2042fe389a82Sstroese
20431fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
20441fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
20451fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
20461fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
20471fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
20481fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
20491fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
20501fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
20511fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
20521fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
20531fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
20541fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
20552c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
2056fe389a82Sstroese
20575d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
20585d110f0aSWilson Callan		environment variable, not the BOOTP server.
2059fe389a82Sstroese
20602c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
20612c00e099SJoe Hershberger		after the configured retry count, the call will fail
20622c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
20632c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
20642c00e099SJoe Hershberger		is not available.
20652c00e099SJoe Hershberger
2066fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
2067fe389a82Sstroese		serverip from a DHCP server, it is possible that more
2068fe389a82Sstroese		than one DNS serverip is offered to the client.
2069fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
2070fe389a82Sstroese		serverip will be stored in the additional environment
2071fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
2072fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
20731fe80d79SJon Loeliger		is defined.
2074fe389a82Sstroese
2075fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
2076fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
2077fe389a82Sstroese		need the hostname of the DHCP requester.
20785d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
20791fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
20801fe80d79SJon Loeliger		option 12 to the DHCP server.
2081fe389a82Sstroese
2082d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
2083d9a2f416SAras Vaichas
2084d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
2085d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
2086d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
2087d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
2088d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
2089d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
2090d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
2091d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
2092d9a2f416SAras Vaichas		that one of the retries will be successful but note that
2093d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
2094d9a2f416SAras Vaichas		this delay.
2095d9a2f416SAras Vaichas
2096d22c338eSJoe Hershberger - Link-local IP address negotiation:
2097d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
2098d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
2099d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
2100d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
2101d22c338eSJoe Hershberger
2102d22c338eSJoe Hershberger		See doc/README.link-local for more information.
2103d22c338eSJoe Hershberger
2104a3d991bdSwdenk - CDP Options:
2105a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
2106a3d991bdSwdenk
2107a3d991bdSwdenk		The device id used in CDP trigger frames.
2108a3d991bdSwdenk
2109a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
2110a3d991bdSwdenk
2111a3d991bdSwdenk		A two character string which is prefixed to the MAC address
2112a3d991bdSwdenk		of the device.
2113a3d991bdSwdenk
2114a3d991bdSwdenk		CONFIG_CDP_PORT_ID
2115a3d991bdSwdenk
2116a3d991bdSwdenk		A printf format string which contains the ascii name of
2117a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
211811ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
2119a3d991bdSwdenk
2120a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
2121a3d991bdSwdenk
2122a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
2123a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
2124a3d991bdSwdenk
2125a3d991bdSwdenk		CONFIG_CDP_VERSION
2126a3d991bdSwdenk
2127a3d991bdSwdenk		An ascii string containing the version of the software.
2128a3d991bdSwdenk
2129a3d991bdSwdenk		CONFIG_CDP_PLATFORM
2130a3d991bdSwdenk
2131a3d991bdSwdenk		An ascii string containing the name of the platform.
2132a3d991bdSwdenk
2133a3d991bdSwdenk		CONFIG_CDP_TRIGGER
2134a3d991bdSwdenk
2135a3d991bdSwdenk		A 32bit integer sent on the trigger.
2136a3d991bdSwdenk
2137a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
2138a3d991bdSwdenk
2139a3d991bdSwdenk		A 16bit integer containing the power consumption of the
2140a3d991bdSwdenk		device in .1 of milliwatts.
2141a3d991bdSwdenk
2142a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
2143a3d991bdSwdenk
2144a3d991bdSwdenk		A byte containing the id of the VLAN.
2145a3d991bdSwdenk
2146c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
2147c609719bSwdenk
2148c609719bSwdenk		Several configurations allow to display the current
2149c609719bSwdenk		status using a LED. For instance, the LED will blink
2150c609719bSwdenk		fast while running U-Boot code, stop blinking as
2151c609719bSwdenk		soon as a reply to a BOOTP request was received, and
2152c609719bSwdenk		start blinking slow once the Linux kernel is running
2153c609719bSwdenk		(supported by a status LED driver in the Linux
2154c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
2155c609719bSwdenk		feature in U-Boot.
2156c609719bSwdenk
21571df7bbbaSIgor Grinberg		Additional options:
21581df7bbbaSIgor Grinberg
21591df7bbbaSIgor Grinberg		CONFIG_GPIO_LED
21601df7bbbaSIgor Grinberg		The status LED can be connected to a GPIO pin.
21611df7bbbaSIgor Grinberg		In such cases, the gpio_led driver can be used as a
21621df7bbbaSIgor Grinberg		status LED backend implementation. Define CONFIG_GPIO_LED
21631df7bbbaSIgor Grinberg		to include the gpio_led driver in the U-Boot binary.
21641df7bbbaSIgor Grinberg
21659dfdcdfeSIgor Grinberg		CONFIG_GPIO_LED_INVERTED_TABLE
21669dfdcdfeSIgor Grinberg		Some GPIO connected LEDs may have inverted polarity in which
21679dfdcdfeSIgor Grinberg		case the GPIO high value corresponds to LED off state and
21689dfdcdfeSIgor Grinberg		GPIO low value corresponds to LED on state.
21699dfdcdfeSIgor Grinberg		In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined
21709dfdcdfeSIgor Grinberg		with a list of GPIO LEDs that have inverted polarity.
21719dfdcdfeSIgor Grinberg
2172c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
2173c609719bSwdenk
2174c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
2175c609719bSwdenk		on those systems that support this (optional)
2176c609719bSwdenk		feature, like the TQM8xxL modules.
2177c609719bSwdenk
21783f4978c7SHeiko Schocher- I2C Support:	CONFIG_SYS_I2C
2179c609719bSwdenk
21803f4978c7SHeiko Schocher		This enable the NEW i2c subsystem, and will allow you to use
21813f4978c7SHeiko Schocher		i2c commands at the u-boot command line (as long as you set
21823f4978c7SHeiko Schocher		CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
21833f4978c7SHeiko Schocher		based realtime clock chips or other i2c devices. See
21843f4978c7SHeiko Schocher		common/cmd_i2c.c for a description of the command line
21853f4978c7SHeiko Schocher		interface.
21863f4978c7SHeiko Schocher
21873f4978c7SHeiko Schocher		ported i2c driver to the new framework:
2188ea818dbbSHeiko Schocher		- drivers/i2c/soft_i2c.c:
2189ea818dbbSHeiko Schocher		  - activate first bus with CONFIG_SYS_I2C_SOFT define
2190ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
2191ea818dbbSHeiko Schocher		    for defining speed and slave address
2192ea818dbbSHeiko Schocher		  - activate second bus with I2C_SOFT_DECLARATIONS2 define
2193ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
2194ea818dbbSHeiko Schocher		    for defining speed and slave address
2195ea818dbbSHeiko Schocher		  - activate third bus with I2C_SOFT_DECLARATIONS3 define
2196ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
2197ea818dbbSHeiko Schocher		    for defining speed and slave address
2198ea818dbbSHeiko Schocher		  - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
2199ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
2200ea818dbbSHeiko Schocher		    for defining speed and slave address
22013f4978c7SHeiko Schocher
220200f792e0SHeiko Schocher		- drivers/i2c/fsl_i2c.c:
220300f792e0SHeiko Schocher		  - activate i2c driver with CONFIG_SYS_I2C_FSL
220400f792e0SHeiko Schocher		    define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
220500f792e0SHeiko Schocher		    offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
220600f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
220700f792e0SHeiko Schocher		    bus.
220800f792e0SHeiko Schocher		  - If your board supports a second fsl i2c bus, define
220900f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
221000f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SPEED for the speed and
221100f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
221200f792e0SHeiko Schocher		    second bus.
221300f792e0SHeiko Schocher
22141f2ba722SSimon Glass		- drivers/i2c/tegra_i2c.c:
22151f2ba722SSimon Glass		  - activate this driver with CONFIG_SYS_I2C_TEGRA
22161f2ba722SSimon Glass		  - This driver adds 4 i2c buses with a fix speed from
22171f2ba722SSimon Glass		    100000 and the slave addr 0!
22181f2ba722SSimon Glass
2219880540deSDirk Eibach		- drivers/i2c/ppc4xx_i2c.c
2220880540deSDirk Eibach		  - activate this driver with CONFIG_SYS_I2C_PPC4XX
2221880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
2222880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
2223880540deSDirk Eibach
2224fac96408Strem		- drivers/i2c/i2c_mxc.c
2225fac96408Strem		  - activate this driver with CONFIG_SYS_I2C_MXC
2226fac96408Strem		  - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED
2227fac96408Strem		  - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE
2228fac96408Strem		  - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED
2229fac96408Strem		  - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE
2230fac96408Strem		  - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED
2231fac96408Strem		  - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
2232fac96408Strem		If thoses defines are not set, default value is 100000
2233fac96408Strem		for speed, and 0 for slave.
2234fac96408Strem
22351086bfa9SNobuhiro Iwamatsu		- drivers/i2c/rcar_i2c.c:
22361086bfa9SNobuhiro Iwamatsu		  - activate this driver with CONFIG_SYS_I2C_RCAR
22371086bfa9SNobuhiro Iwamatsu		  - This driver adds 4 i2c buses
22381086bfa9SNobuhiro Iwamatsu
22391086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0
22401086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0
22411086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1
22421086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1
22431086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2
22441086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2
22451086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3
22461086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3
22471086bfa9SNobuhiro Iwamatsu		  - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses
22481086bfa9SNobuhiro Iwamatsu
22492035d77dSNobuhiro Iwamatsu		- drivers/i2c/sh_i2c.c:
22502035d77dSNobuhiro Iwamatsu		  - activate this driver with CONFIG_SYS_I2C_SH
22512035d77dSNobuhiro Iwamatsu		  - This driver adds from 2 to 5 i2c buses
22522035d77dSNobuhiro Iwamatsu
22532035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0
22542035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0
22552035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1
22562035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1
22572035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2
22582035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2
22592035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3
22602035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3
22612035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4
22622035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4
22632035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE5 for setting the register channel 5
22642035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED5 for for the speed channel 5
22652035d77dSNobuhiro Iwamatsu		  - CONFIF_SYS_I2C_SH_NUM_CONTROLLERS for nummber of i2c buses
22662035d77dSNobuhiro Iwamatsu
22676789e84eSHeiko Schocher		- drivers/i2c/omap24xx_i2c.c
22686789e84eSHeiko Schocher		  - activate this driver with CONFIG_SYS_I2C_OMAP24XX
22696789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0
22706789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0
22716789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1
22726789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1
22736789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2
22746789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2
22756789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3
22766789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3
22776789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4
22786789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4
22796789e84eSHeiko Schocher
22800bdffe71SHeiko Schocher		- drivers/i2c/zynq_i2c.c
22810bdffe71SHeiko Schocher		  - activate this driver with CONFIG_SYS_I2C_ZYNQ
22820bdffe71SHeiko Schocher		  - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting
22830bdffe71SHeiko Schocher		  - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr
22840bdffe71SHeiko Schocher
2285e717fc6dSNaveen Krishna Ch		- drivers/i2c/s3c24x0_i2c.c:
2286e717fc6dSNaveen Krishna Ch		  - activate this driver with CONFIG_SYS_I2C_S3C24X0
2287e717fc6dSNaveen Krishna Ch		  - This driver adds i2c buses (11 for Exynos5250, Exynos5420
2288e717fc6dSNaveen Krishna Ch		    9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung)
2289e717fc6dSNaveen Krishna Ch		    with a fix speed from 100000 and the slave addr 0!
2290e717fc6dSNaveen Krishna Ch
2291b46226bdSDirk Eibach		- drivers/i2c/ihs_i2c.c
2292b46226bdSDirk Eibach		  - activate this driver with CONFIG_SYS_I2C_IHS
2293b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_CH0 activate hardware channel 0
2294b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SPEED_0 speed channel 0
2295b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SLAVE_0 slave addr channel 0
2296b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_CH1 activate hardware channel 1
2297b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SPEED_1 speed channel 1
2298b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SLAVE_1 slave addr channel 1
2299b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_CH2 activate hardware channel 2
2300b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SPEED_2 speed channel 2
2301b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SLAVE_2 slave addr channel 2
2302b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_CH3 activate hardware channel 3
2303b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SPEED_3 speed channel 3
2304b46226bdSDirk Eibach		  - CONFIG_SYS_I2C_IHS_SLAVE_3 slave addr channel 3
2305b46226bdSDirk Eibach
23063f4978c7SHeiko Schocher		additional defines:
23073f4978c7SHeiko Schocher
23083f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES
23093f4978c7SHeiko Schocher		Hold the number of i2c busses you want to use. If you
23103f4978c7SHeiko Schocher		don't use/have i2c muxes on your i2c bus, this
23113f4978c7SHeiko Schocher		is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
23123f4978c7SHeiko Schocher		omit this define.
23133f4978c7SHeiko Schocher
23143f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS
23153f4978c7SHeiko Schocher		define this, if you don't use i2c muxes on your hardware.
23163f4978c7SHeiko Schocher		if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
23173f4978c7SHeiko Schocher		omit this define.
23183f4978c7SHeiko Schocher
23193f4978c7SHeiko Schocher		CONFIG_SYS_I2C_MAX_HOPS
23203f4978c7SHeiko Schocher		define how many muxes are maximal consecutively connected
23213f4978c7SHeiko Schocher		on one i2c bus. If you not use i2c muxes, omit this
23223f4978c7SHeiko Schocher		define.
23233f4978c7SHeiko Schocher
23243f4978c7SHeiko Schocher		CONFIG_SYS_I2C_BUSES
23253f4978c7SHeiko Schocher		hold a list of busses you want to use, only used if
23263f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
23273f4978c7SHeiko Schocher		a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
23283f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES = 9:
23293f4978c7SHeiko Schocher
23303f4978c7SHeiko Schocher		 CONFIG_SYS_I2C_BUSES	{{0, {I2C_NULL_HOP}}, \
23313f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
23323f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
23333f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
23343f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
23353f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
23363f4978c7SHeiko Schocher					{1, {I2C_NULL_HOP}}, \
23373f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
23383f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
23393f4978c7SHeiko Schocher					}
23403f4978c7SHeiko Schocher
23413f4978c7SHeiko Schocher		which defines
23423f4978c7SHeiko Schocher			bus 0 on adapter 0 without a mux
2343ea818dbbSHeiko Schocher			bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
2344ea818dbbSHeiko Schocher			bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
2345ea818dbbSHeiko Schocher			bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
2346ea818dbbSHeiko Schocher			bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
2347ea818dbbSHeiko Schocher			bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
23483f4978c7SHeiko Schocher			bus 6 on adapter 1 without a mux
2349ea818dbbSHeiko Schocher			bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
2350ea818dbbSHeiko Schocher			bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
23513f4978c7SHeiko Schocher
23523f4978c7SHeiko Schocher		If you do not have i2c muxes on your board, omit this define.
23533f4978c7SHeiko Schocher
2354ea818dbbSHeiko Schocher- Legacy I2C Support:	CONFIG_HARD_I2C
23553f4978c7SHeiko Schocher
23563f4978c7SHeiko Schocher		NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
23573f4978c7SHeiko Schocher		provides the following compelling advantages:
23583f4978c7SHeiko Schocher
23593f4978c7SHeiko Schocher		- more than one i2c adapter is usable
23603f4978c7SHeiko Schocher		- approved multibus support
23613f4978c7SHeiko Schocher		- better i2c mux support
23623f4978c7SHeiko Schocher
23633f4978c7SHeiko Schocher		** Please consider updating your I2C driver now. **
23643f4978c7SHeiko Schocher
2365ea818dbbSHeiko Schocher		These enable legacy I2C serial bus commands. Defining
2366ea818dbbSHeiko Schocher		CONFIG_HARD_I2C will include the appropriate I2C driver
2367ea818dbbSHeiko Schocher		for the selected CPU.
2368c609719bSwdenk
2369b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
2370602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
2371b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
2372b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
2373c609719bSwdenk		command line interface.
2374c609719bSwdenk
2375bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
2376c609719bSwdenk
2377b37c7e5eSwdenk		There are several other quantities that must also be
2378ea818dbbSHeiko Schocher		defined when you define CONFIG_HARD_I2C.
2379c609719bSwdenk
23806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
2381b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
23826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
238311ccc33fSMarcel Ziswiler		the CPU's i2c node address).
2384c609719bSwdenk
23858d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
2386a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
23878d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
23888d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
23898d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
2390b37c7e5eSwdenk
23915da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
23925da71efaSEric Millbrandt
23935da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
23945da71efaSEric Millbrandt		chips might think that the current transfer is still
23955da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
23965da71efaSEric Millbrandt		commands until the slave device responds.
23975da71efaSEric Millbrandt
2398b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
2399b37c7e5eSwdenk
2400ea818dbbSHeiko Schocher		If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
2401b37c7e5eSwdenk		then the following macros need to be defined (examples are
2402b37c7e5eSwdenk		from include/configs/lwmon.h):
2403c609719bSwdenk
2404c609719bSwdenk		I2C_INIT
2405c609719bSwdenk
2406b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
2407c609719bSwdenk		controller or configure ports.
2408c609719bSwdenk
2409b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
2410b37c7e5eSwdenk
2411c609719bSwdenk		I2C_PORT
2412c609719bSwdenk
2413c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
2414c609719bSwdenk		assumes both bits are on the same port). Valid values
2415c609719bSwdenk		are 0..3 for ports A..D.
2416c609719bSwdenk
2417c609719bSwdenk		I2C_ACTIVE
2418c609719bSwdenk
2419c609719bSwdenk		The code necessary to make the I2C data line active
2420c609719bSwdenk		(driven).  If the data line is open collector, this
2421c609719bSwdenk		define can be null.
2422c609719bSwdenk
2423b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
2424b37c7e5eSwdenk
2425c609719bSwdenk		I2C_TRISTATE
2426c609719bSwdenk
2427c609719bSwdenk		The code necessary to make the I2C data line tri-stated
2428c609719bSwdenk		(inactive).  If the data line is open collector, this
2429c609719bSwdenk		define can be null.
2430c609719bSwdenk
2431b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2432b37c7e5eSwdenk
2433c609719bSwdenk		I2C_READ
2434c609719bSwdenk
2435472d5460SYork Sun		Code that returns true if the I2C data line is high,
2436472d5460SYork Sun		false if it is low.
2437c609719bSwdenk
2438b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2439b37c7e5eSwdenk
2440c609719bSwdenk		I2C_SDA(bit)
2441c609719bSwdenk
2442472d5460SYork Sun		If <bit> is true, sets the I2C data line high. If it
2443472d5460SYork Sun		is false, it clears it (low).
2444c609719bSwdenk
2445b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
2446b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
2447b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
2448b37c7e5eSwdenk
2449c609719bSwdenk		I2C_SCL(bit)
2450c609719bSwdenk
2451472d5460SYork Sun		If <bit> is true, sets the I2C clock line high. If it
2452472d5460SYork Sun		is false, it clears it (low).
2453c609719bSwdenk
2454b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
2455b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
2456b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
2457b37c7e5eSwdenk
2458c609719bSwdenk		I2C_DELAY
2459c609719bSwdenk
2460c609719bSwdenk		This delay is invoked four times per clock cycle so this
2461c609719bSwdenk		controls the rate of data transfer.  The data rate thus
2462b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
2463b37c7e5eSwdenk		like:
2464b37c7e5eSwdenk
2465b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
2466c609719bSwdenk
2467793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2468793b5726SMike Frysinger
2469793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
2470793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
2471793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
2472793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
2473793b5726SMike Frysinger
2474793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
2475793b5726SMike Frysinger		the generic GPIO functions.
2476793b5726SMike Frysinger
24776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
247847cd00faSwdenk
247947cd00faSwdenk		When a board is reset during an i2c bus transfer
248047cd00faSwdenk		chips might think that the current transfer is still
248147cd00faSwdenk		in progress. On some boards it is possible to access
248247cd00faSwdenk		the i2c SCLK line directly, either by using the
248347cd00faSwdenk		processor pin as a GPIO or by having a second pin
248447cd00faSwdenk		connected to the bus. If this option is defined a
248547cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
248647cd00faSwdenk		is run early in the boot sequence.
248747cd00faSwdenk
248826a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
248926a33504SRichard Retanubun
249026a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
249126a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
249226a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
249326a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
249426a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
249526a33504SRichard Retanubun		controller provide such a method. It is called at the end of
249626a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
249726a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
249826a33504SRichard Retanubun
249917ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
250017ea1177Swdenk
250117ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
250217ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
250317ea1177Swdenk		variable "i2cfast". (see also i2cfast)
250417ea1177Swdenk
2505bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
2506bb99ad6dSBen Warren
2507bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
2508bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
2509bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
2510bb99ad6dSBen Warren		Note that bus numbering is zero-based.
2511bb99ad6dSBen Warren
25126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
2513bb99ad6dSBen Warren
2514bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
25150f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
25160f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
25170f89c54bSPeter Tyser		a 1D array of device addresses
2518bb99ad6dSBen Warren
2519bb99ad6dSBen Warren		e.g.
2520bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
25216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2522bb99ad6dSBen Warren
2523bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
2524bb99ad6dSBen Warren
2525bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
25266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
2527bb99ad6dSBen Warren
2528bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2529bb99ad6dSBen Warren
25306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
2531be5e6181STimur Tabi
2532be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
2533be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2534be5e6181STimur Tabi
25356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
25360dc018ecSStefan Roese
25370dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
25380dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
25390dc018ecSStefan Roese
25406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
25410dc018ecSStefan Roese
25420dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
25430dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
25440dc018ecSStefan Roese
25456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
25469ebbb54fSVictor Gallardo
25479ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
25489ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
25499ebbb54fSVictor Gallardo		specified DTT device.
25509ebbb54fSVictor Gallardo
25512ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
25522ac6985aSAndrew Dyer
25532ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
25542ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
25552ac6985aSAndrew Dyer		between writing the address pointer and reading the
25562ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
25572ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
25582ac6985aSAndrew Dyer		devices can use either method, but some require one or
25592ac6985aSAndrew Dyer		the other.
2560be5e6181STimur Tabi
2561c609719bSwdenk- SPI Support:	CONFIG_SPI
2562c609719bSwdenk
2563c609719bSwdenk		Enables SPI driver (so far only tested with
2564c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2565c609719bSwdenk		D/As on the SACSng board)
2566c609719bSwdenk
25676639562eSYoshihiro Shimoda		CONFIG_SH_SPI
25686639562eSYoshihiro Shimoda
25696639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
25706639562eSYoshihiro Shimoda		only SH7757 is supported.
25716639562eSYoshihiro Shimoda
2572c609719bSwdenk		CONFIG_SPI_X
2573c609719bSwdenk
2574c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2575c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2576c609719bSwdenk
2577c609719bSwdenk		CONFIG_SOFT_SPI
2578c609719bSwdenk
2579c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2580c609719bSwdenk		using hardware support. This is a general purpose
2581c609719bSwdenk		driver that only requires three general I/O port pins
2582c609719bSwdenk		(two outputs, one input) to function. If this is
2583c609719bSwdenk		defined, the board configuration must define several
2584c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2585c609719bSwdenk		an example, see include/configs/sacsng.h.
2586c609719bSwdenk
258704a9e118SBen Warren		CONFIG_HARD_SPI
258804a9e118SBen Warren
258904a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
259004a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
259104a9e118SBen Warren		must define a list of chip-select function pointers.
259204a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
259304a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
259404a9e118SBen Warren
259538254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
259638254f45SGuennadi Liakhovetski
259738254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
25982e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
259938254f45SGuennadi Liakhovetski
2600f659b573SHeiko Schocher		CONFIG_SYS_SPI_MXC_WAIT
2601f659b573SHeiko Schocher		Timeout for waiting until spi transfer completed.
2602f659b573SHeiko Schocher		default: (CONFIG_SYS_HZ/100)     /* 10 ms */
2603f659b573SHeiko Schocher
26040133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
26050133502eSMatthias Fuchs
26060133502eSMatthias Fuchs		Enables FPGA subsystem.
26070133502eSMatthias Fuchs
26080133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
26090133502eSMatthias Fuchs
26100133502eSMatthias Fuchs		Enables support for specific chip vendors.
26110133502eSMatthias Fuchs		(ALTERA, XILINX)
26120133502eSMatthias Fuchs
26130133502eSMatthias Fuchs		CONFIG_FPGA_<family>
26140133502eSMatthias Fuchs
26150133502eSMatthias Fuchs		Enables support for FPGA family.
26160133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
26170133502eSMatthias Fuchs
26180133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2619c609719bSwdenk
2620c609719bSwdenk		Specify the number of FPGA devices to support.
2621c609719bSwdenk
262264e809afSSiva Durga Prasad Paladugu		CONFIG_CMD_FPGA_LOADMK
262364e809afSSiva Durga Prasad Paladugu
262464e809afSSiva Durga Prasad Paladugu		Enable support for fpga loadmk command
262564e809afSSiva Durga Prasad Paladugu
262667193864SMichal Simek		CONFIG_CMD_FPGA_LOADP
262767193864SMichal Simek
262867193864SMichal Simek		Enable support for fpga loadp command - load partial bitstream
262967193864SMichal Simek
263067193864SMichal Simek		CONFIG_CMD_FPGA_LOADBP
263167193864SMichal Simek
263267193864SMichal Simek		Enable support for fpga loadbp command - load partial bitstream
263367193864SMichal Simek		(Xilinx only)
263467193864SMichal Simek
26356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2636c609719bSwdenk
2637c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2638c609719bSwdenk
26396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2640c609719bSwdenk
2641c609719bSwdenk		Enable checks on FPGA configuration interface busy
2642c609719bSwdenk		status by the configuration function. This option
2643c609719bSwdenk		will require a board or device specific function to
2644c609719bSwdenk		be written.
2645c609719bSwdenk
2646c609719bSwdenk		CONFIG_FPGA_DELAY
2647c609719bSwdenk
2648c609719bSwdenk		If defined, a function that provides delays in the FPGA
2649c609719bSwdenk		configuration driver.
2650c609719bSwdenk
26516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2652c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2653c609719bSwdenk
26546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2655c609719bSwdenk
2656c609719bSwdenk		Check for configuration errors during FPGA bitfile
2657c609719bSwdenk		loading. For example, abort during Virtex II
2658c609719bSwdenk		configuration if the INIT_B line goes low (which
2659c609719bSwdenk		indicated a CRC error).
2660c609719bSwdenk
26616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2662c609719bSwdenk
2663c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2664c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2665c609719bSwdenk		FPGA configuration sequence. The default time is 500
266611ccc33fSMarcel Ziswiler		ms.
2667c609719bSwdenk
26686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2669c609719bSwdenk
2670c609719bSwdenk		Maximum time to wait for BUSY to deassert during
267111ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2672c609719bSwdenk
26736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2674c609719bSwdenk
2675c609719bSwdenk		Time to wait after FPGA configuration. The default is
267611ccc33fSMarcel Ziswiler		200 ms.
2677c609719bSwdenk
2678c609719bSwdenk- Configuration Management:
2679c609719bSwdenk		CONFIG_IDENT_STRING
2680c609719bSwdenk
2681c609719bSwdenk		If defined, this string will be added to the U-Boot
2682c609719bSwdenk		version information (U_BOOT_VERSION)
2683c609719bSwdenk
2684c609719bSwdenk- Vendor Parameter Protection:
2685c609719bSwdenk
2686c609719bSwdenk		U-Boot considers the values of the environment
2687c609719bSwdenk		variables "serial#" (Board Serial Number) and
26887152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2689c609719bSwdenk		are set once by the board vendor / manufacturer, and
2690c609719bSwdenk		protects these variables from casual modification by
2691c609719bSwdenk		the user. Once set, these variables are read-only,
2692c609719bSwdenk		and write or delete attempts are rejected. You can
269311ccc33fSMarcel Ziswiler		change this behaviour:
2694c609719bSwdenk
2695c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2696c609719bSwdenk		file, the write protection for vendor parameters is
269747cd00faSwdenk		completely disabled. Anybody can change or delete
2698c609719bSwdenk		these parameters.
2699c609719bSwdenk
2700c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2701c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
270211ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2703c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2704c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2705c609719bSwdenk		read-only.]
2706c609719bSwdenk
27072598090bSJoe Hershberger		The same can be accomplished in a more flexible way
27082598090bSJoe Hershberger		for any variable by configuring the type of access
27092598090bSJoe Hershberger		to allow for those variables in the ".flags" variable
27102598090bSJoe Hershberger		or define CONFIG_ENV_FLAGS_LIST_STATIC.
27112598090bSJoe Hershberger
2712c609719bSwdenk- Protected RAM:
2713c609719bSwdenk		CONFIG_PRAM
2714c609719bSwdenk
2715c609719bSwdenk		Define this variable to enable the reservation of
2716c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2717c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2718c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2719c609719bSwdenk		this default value by defining an environment
2720c609719bSwdenk		variable "pram" to the number of kB you want to
2721c609719bSwdenk		reserve. Note that the board info structure will
2722c609719bSwdenk		still show the full amount of RAM. If pRAM is
2723c609719bSwdenk		reserved, a new environment variable "mem" will
2724c609719bSwdenk		automatically be defined to hold the amount of
2725c609719bSwdenk		remaining RAM in a form that can be passed as boot
2726c609719bSwdenk		argument to Linux, for instance like that:
2727c609719bSwdenk
2728fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2729c609719bSwdenk			saveenv
2730c609719bSwdenk
2731c609719bSwdenk		This way you can tell Linux not to use this memory,
2732c609719bSwdenk		either, which results in a memory region that will
2733c609719bSwdenk		not be affected by reboots.
2734c609719bSwdenk
2735c609719bSwdenk		*WARNING* If your board configuration uses automatic
2736c609719bSwdenk		detection of the RAM size, you must make sure that
2737c609719bSwdenk		this memory test is non-destructive. So far, the
2738c609719bSwdenk		following board configurations are known to be
2739c609719bSwdenk		"pRAM-clean":
2740c609719bSwdenk
27411b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
27421b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2743544d97e9SWolfgang Denk			FLAGADM, TQM8260
2744c609719bSwdenk
274540fef049SGabe Black- Access to physical memory region (> 4GB)
274640fef049SGabe Black		Some basic support is provided for operations on memory not
274740fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
274840fef049SGabe Black		support access to more than 4GB of memory on 32-bit
274940fef049SGabe Black		machines using physical address extension or similar.
275040fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
275140fef049SGabe Black		currently only supports clearing the memory.
275240fef049SGabe Black
2753c609719bSwdenk- Error Recovery:
2754c609719bSwdenk		CONFIG_PANIC_HANG
2755c609719bSwdenk
2756c609719bSwdenk		Define this variable to stop the system in case of a
2757c609719bSwdenk		fatal error, so that you have to reset it manually.
2758c609719bSwdenk		This is probably NOT a good idea for an embedded
275911ccc33fSMarcel Ziswiler		system where you want the system to reboot
2760c609719bSwdenk		automatically as fast as possible, but it may be
2761c609719bSwdenk		useful during development since you can try to debug
2762c609719bSwdenk		the conditions that lead to the situation.
2763c609719bSwdenk
2764c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2765c609719bSwdenk
2766c609719bSwdenk		This variable defines the number of retries for
2767c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2768c609719bSwdenk		before giving up the operation. If not defined, a
2769c609719bSwdenk		default value of 5 is used.
2770c609719bSwdenk
277140cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
277240cb90eeSGuennadi Liakhovetski
277340cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
277440cb90eeSGuennadi Liakhovetski
277548a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
277648a3e999STetsuyuki Kobayashi
277748a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
277848a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
277948a3e999STetsuyuki Kobayashi		try longer timeout such as
278048a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
278148a3e999STetsuyuki Kobayashi
2782c609719bSwdenk- Command Interpreter:
27838078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
278404a85b3bSwdenk
278504a85b3bSwdenk		Enable auto completion of commands using TAB.
278604a85b3bSwdenk
27878078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
27888078f1a5SWolfgang Denk		for the "hush" shell.
27898078f1a5SWolfgang Denk
27908078f1a5SWolfgang Denk
27916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2792c609719bSwdenk
2793c609719bSwdenk		Define this variable to enable the "hush" shell (from
2794c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2795c609719bSwdenk		powerful command line syntax like
2796c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2797c609719bSwdenk		constructs ("shell scripts").
2798c609719bSwdenk
2799c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2800c609719bSwdenk		with a somewhat smaller memory footprint.
2801c609719bSwdenk
2802c609719bSwdenk
28036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2804c609719bSwdenk
2805c609719bSwdenk		This defines the secondary prompt string, which is
2806c609719bSwdenk		printed when the command interpreter needs more input
2807c609719bSwdenk		to complete a command. Usually "> ".
2808c609719bSwdenk
2809c609719bSwdenk	Note:
2810c609719bSwdenk
2811c609719bSwdenk		In the current implementation, the local variables
2812c609719bSwdenk		space and global environment variables space are
2813c609719bSwdenk		separated. Local variables are those you define by
28143b57fe0aSwdenk		simply typing `name=value'. To access a local
2815c609719bSwdenk		variable later on, you have write `$name' or
28163b57fe0aSwdenk		`${name}'; to execute the contents of a variable
28173b57fe0aSwdenk		directly type `$name' at the command prompt.
2818c609719bSwdenk
2819c609719bSwdenk		Global environment variables are those you use
2820c609719bSwdenk		setenv/printenv to work with. To run a command stored
2821c609719bSwdenk		in such a variable, you need to use the run command,
2822c609719bSwdenk		and you must not use the '$' sign to access them.
2823c609719bSwdenk
2824c609719bSwdenk		To store commands and special characters in a
2825c609719bSwdenk		variable, please use double quotation marks
2826c609719bSwdenk		surrounding the whole text of the variable, instead
2827c609719bSwdenk		of the backslashes before semicolons and special
2828c609719bSwdenk		symbols.
2829c609719bSwdenk
2830aa0c71acSWolfgang Denk- Commandline Editing and History:
2831aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2832aa0c71acSWolfgang Denk
283311ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2834aa0c71acSWolfgang Denk		commandline input operations
2835aa0c71acSWolfgang Denk
2836a8c7c708Swdenk- Default Environment:
2837c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2838c609719bSwdenk
2839c609719bSwdenk		Define this to contain any number of null terminated
2840c609719bSwdenk		strings (variable = value pairs) that will be part of
28417152b1d0Swdenk		the default environment compiled into the boot image.
28422262cfeeSwdenk
2843c609719bSwdenk		For example, place something like this in your
2844c609719bSwdenk		board's config file:
2845c609719bSwdenk
2846c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2847c609719bSwdenk			"myvar1=value1\0" \
2848c609719bSwdenk			"myvar2=value2\0"
2849c609719bSwdenk
2850c609719bSwdenk		Warning: This method is based on knowledge about the
2851c609719bSwdenk		internal format how the environment is stored by the
28522262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2853c609719bSwdenk		interface! Although it is unlikely that this format
28547152b1d0Swdenk		will change soon, there is no guarantee either.
2855c609719bSwdenk		You better know what you are doing here.
2856c609719bSwdenk
2857c609719bSwdenk		Note: overly (ab)use of the default environment is
2858c609719bSwdenk		discouraged. Make sure to check other ways to preset
285974de7aefSWolfgang Denk		the environment like the "source" command or the
2860c609719bSwdenk		boot command first.
2861c609719bSwdenk
28625e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
28635e724ca2SStephen Warren
28645e724ca2SStephen Warren		Define this in order to add variables describing the
28655e724ca2SStephen Warren		U-Boot build configuration to the default environment.
28665e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
28675e724ca2SStephen Warren
28685e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
28695e724ca2SStephen Warren
28705e724ca2SStephen Warren		- CONFIG_SYS_ARCH
28715e724ca2SStephen Warren		- CONFIG_SYS_CPU
28725e724ca2SStephen Warren		- CONFIG_SYS_BOARD
28735e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
28745e724ca2SStephen Warren		- CONFIG_SYS_SOC
28755e724ca2SStephen Warren
28767e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
28777e27f89fSTom Rini
28787e27f89fSTom Rini		Define this in order to add variables describing certain
28797e27f89fSTom Rini		run-time determined information about the hardware to the
28807e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
28817e27f89fSTom Rini
288206fd8538SSimon Glass		CONFIG_DELAY_ENVIRONMENT
288306fd8538SSimon Glass
288406fd8538SSimon Glass		Normally the environment is loaded when the board is
288506fd8538SSimon Glass		intialised so that it is available to U-Boot. This inhibits
288606fd8538SSimon Glass		that so that the environment is not available until
288706fd8538SSimon Glass		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
288806fd8538SSimon Glass		this is instead controlled by the value of
288906fd8538SSimon Glass		/config/load-environment.
289006fd8538SSimon Glass
2891a8c7c708Swdenk- DataFlash Support:
28922abbe075Swdenk		CONFIG_HAS_DATAFLASH
28932abbe075Swdenk
28942abbe075Swdenk		Defining this option enables DataFlash features and
28952abbe075Swdenk		allows to read/write in Dataflash via the standard
28962abbe075Swdenk		commands cp, md...
28972abbe075Swdenk
2898f61ec45eSEric Nelson- Serial Flash support
2899f61ec45eSEric Nelson		CONFIG_CMD_SF
2900f61ec45eSEric Nelson
2901f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2902f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2903f61ec45eSEric Nelson
2904f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2905f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2906f61ec45eSEric Nelson		commands.
2907f61ec45eSEric Nelson
2908f61ec45eSEric Nelson		The following defaults may be provided by the platform
2909f61ec45eSEric Nelson		to handle the common case when only a single serial
2910f61ec45eSEric Nelson		flash is present on the system.
2911f61ec45eSEric Nelson
2912f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2913f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2914f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2915f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2916f61ec45eSEric Nelson
291724007273SSimon Glass		CONFIG_CMD_SF_TEST
291824007273SSimon Glass
291924007273SSimon Glass		Define this option to include a destructive SPI flash
292024007273SSimon Glass		test ('sf test').
292124007273SSimon Glass
29221dcd6d03SJagannadha Sutradharudu Teki		CONFIG_SPI_FLASH_BAR		Ban/Extended Addr Reg
29231dcd6d03SJagannadha Sutradharudu Teki
29241dcd6d03SJagannadha Sutradharudu Teki		Define this option to use the Bank addr/Extended addr
29251dcd6d03SJagannadha Sutradharudu Teki		support on SPI flashes which has size > 16Mbytes.
29261dcd6d03SJagannadha Sutradharudu Teki
2927b902e07cSJagannadha Sutradharudu Teki		CONFIG_SF_DUAL_FLASH		Dual flash memories
2928b902e07cSJagannadha Sutradharudu Teki
2929b902e07cSJagannadha Sutradharudu Teki		Define this option to use dual flash support where two flash
2930b902e07cSJagannadha Sutradharudu Teki		memories can be connected with a given cs line.
2931b902e07cSJagannadha Sutradharudu Teki		currently Xilinx Zynq qspi support these type of connections.
2932b902e07cSJagannadha Sutradharudu Teki
29333f85ce27Swdenk- SystemACE Support:
29343f85ce27Swdenk		CONFIG_SYSTEMACE
29353f85ce27Swdenk
29363f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
29373f85ce27Swdenk		chips attached via some sort of local bus. The address
293811ccc33fSMarcel Ziswiler		of the chip must also be defined in the
29396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
29403f85ce27Swdenk
29413f85ce27Swdenk		#define CONFIG_SYSTEMACE
29426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
29433f85ce27Swdenk
29443f85ce27Swdenk		When SystemACE support is added, the "ace" device type
29453f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
29463f85ce27Swdenk
2947ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2948ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2949ecb0ccd9SWolfgang Denk
295028cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2951ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
295228cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2953ecb0ccd9SWolfgang Denk		number generator is used.
2954ecb0ccd9SWolfgang Denk
295528cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
295628cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
295728cb9375SWolfgang Denk		defined, the normal port 69 is used.
295828cb9375SWolfgang Denk
295928cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2960ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2961ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2962ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2963ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2964ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2965ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2966ecb0ccd9SWolfgang Denk
2967bf36c5d5SSimon Glass- Hashing support:
2968bf36c5d5SSimon Glass		CONFIG_CMD_HASH
2969bf36c5d5SSimon Glass
2970bf36c5d5SSimon Glass		This enables a generic 'hash' command which can produce
2971bf36c5d5SSimon Glass		hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2972bf36c5d5SSimon Glass
2973bf36c5d5SSimon Glass		CONFIG_HASH_VERIFY
2974bf36c5d5SSimon Glass
2975bf36c5d5SSimon Glass		Enable the hash verify command (hash -v). This adds to code
2976bf36c5d5SSimon Glass		size a little.
2977bf36c5d5SSimon Glass
2978bf36c5d5SSimon Glass		CONFIG_SHA1 - support SHA1 hashing
2979bf36c5d5SSimon Glass		CONFIG_SHA256 - support SHA256 hashing
2980bf36c5d5SSimon Glass
2981bf36c5d5SSimon Glass		Note: There is also a sha1sum command, which should perhaps
2982bf36c5d5SSimon Glass		be deprecated in favour of 'hash sha1'.
2983bf36c5d5SSimon Glass
2984a11f1873SRobert Winkler- Freescale i.MX specific commands:
2985a11f1873SRobert Winkler		CONFIG_CMD_HDMIDETECT
2986a11f1873SRobert Winkler		This enables 'hdmidet' command which returns true if an
2987a11f1873SRobert Winkler		HDMI monitor is detected.  This command is i.MX 6 specific.
2988a11f1873SRobert Winkler
2989a11f1873SRobert Winkler		CONFIG_CMD_BMODE
2990a11f1873SRobert Winkler		This enables the 'bmode' (bootmode) command for forcing
2991a11f1873SRobert Winkler		a boot from specific media.
2992a11f1873SRobert Winkler
2993a11f1873SRobert Winkler		This is useful for forcing the ROM's usb downloader to
2994a11f1873SRobert Winkler		activate upon a watchdog reset which is nice when iterating
2995a11f1873SRobert Winkler		on U-Boot.  Using the reset button or running bmode normal
2996a11f1873SRobert Winkler		will set it back to normal.  This command currently
2997a11f1873SRobert Winkler		supports i.MX53 and i.MX6.
2998a11f1873SRobert Winkler
299919c402afSSimon Glass- Signing support:
300019c402afSSimon Glass		CONFIG_RSA
300119c402afSSimon Glass
300219c402afSSimon Glass		This enables the RSA algorithm used for FIT image verification
30038bf2aad7SDetlev Zundel		in U-Boot. See doc/uImage.FIT/signature.txt for more information.
300419c402afSSimon Glass
300519c402afSSimon Glass		The signing part is build into mkimage regardless of this
300619c402afSSimon Glass		option.
300719c402afSSimon Glass
30089e50c406SHeiko Schocher- bootcount support:
30099e50c406SHeiko Schocher		CONFIG_BOOTCOUNT_LIMIT
30109e50c406SHeiko Schocher
30119e50c406SHeiko Schocher		This enables the bootcounter support, see:
30129e50c406SHeiko Schocher		http://www.denx.de/wiki/DULG/UBootBootCountLimit
30139e50c406SHeiko Schocher
30149e50c406SHeiko Schocher		CONFIG_AT91SAM9XE
30159e50c406SHeiko Schocher		enable special bootcounter support on at91sam9xe based boards.
30169e50c406SHeiko Schocher		CONFIG_BLACKFIN
30179e50c406SHeiko Schocher		enable special bootcounter support on blackfin based boards.
30189e50c406SHeiko Schocher		CONFIG_SOC_DA8XX
30199e50c406SHeiko Schocher		enable special bootcounter support on da850 based boards.
30209e50c406SHeiko Schocher		CONFIG_BOOTCOUNT_RAM
30219e50c406SHeiko Schocher		enable support for the bootcounter in RAM
30229e50c406SHeiko Schocher		CONFIG_BOOTCOUNT_I2C
30239e50c406SHeiko Schocher		enable support for the bootcounter on an i2c (like RTC) device.
30249e50c406SHeiko Schocher			CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
30259e50c406SHeiko Schocher			CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
30269e50c406SHeiko Schocher						    the bootcounter.
30279e50c406SHeiko Schocher			CONFIG_BOOTCOUNT_ALEN = address len
302819c402afSSimon Glass
3029a8c7c708Swdenk- Show boot progress:
3030c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
3031c609719bSwdenk
3032c609719bSwdenk		Defining this option allows to add some board-
3033c609719bSwdenk		specific code (calling a user-provided function
3034c609719bSwdenk		"show_boot_progress(int)") that enables you to show
3035c609719bSwdenk		the system's boot progress on some display (for
3036c609719bSwdenk		example, some LED's) on your board. At the moment,
3037c609719bSwdenk		the following checkpoints are implemented:
3038c609719bSwdenk
30393a608ca0SSimon Glass- Detailed boot stage timing
30403a608ca0SSimon Glass		CONFIG_BOOTSTAGE
30413a608ca0SSimon Glass		Define this option to get detailed timing of each stage
30423a608ca0SSimon Glass		of the boot process.
30433a608ca0SSimon Glass
30443a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
30453a608ca0SSimon Glass		This is the number of available user bootstage records.
30463a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
30473a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
30483a608ca0SSimon Glass		the limit, recording will stop.
30493a608ca0SSimon Glass
30503a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
30513a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
30523a608ca0SSimon Glass
30533a608ca0SSimon Glass		Timer summary in microseconds:
30543a608ca0SSimon Glass		       Mark    Elapsed  Stage
30553a608ca0SSimon Glass			  0          0  reset
30563a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
30573a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
30583a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
30593a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
30603a608ca0SSimon Glass		  3,910,375    250,777  main_loop
30613a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
30623a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
30633a608ca0SSimon Glass
30642eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
30652eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
30662eba38cfSSimon Glass		and un/stashing of bootstage data.
30672eba38cfSSimon Glass
306894fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
306994fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
307094fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
307194fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
307294fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
307394fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
307494fd1316SSimon Glass		For example:
307594fd1316SSimon Glass
307694fd1316SSimon Glass		bootstage {
307794fd1316SSimon Glass			154 {
307894fd1316SSimon Glass				name = "board_init_f";
307994fd1316SSimon Glass				mark = <3575678>;
308094fd1316SSimon Glass			};
308194fd1316SSimon Glass			170 {
308294fd1316SSimon Glass				name = "lcd";
308394fd1316SSimon Glass				accum = <33482>;
308494fd1316SSimon Glass			};
308594fd1316SSimon Glass		};
308694fd1316SSimon Glass
308794fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
308894fd1316SSimon Glass
30891372cce2SMarian BalakowiczLegacy uImage format:
30901372cce2SMarian Balakowicz
3091c609719bSwdenk  Arg	Where			When
3092c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
3093c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
3094c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
3095c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
3096c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
3097c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
3098c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
3099c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
3100c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
31011372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
3102c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
3103c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
3104c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
3105c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
31061372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
3107c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
31081372cce2SMarian Balakowicz
31091372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
31101372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
31111372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
31121372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
31131372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
31141372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
31151372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
311611ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
31171372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
31181372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
31191372cce2SMarian Balakowicz
3120ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
3121c609719bSwdenk
3122a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
312363e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
312463e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
312563e73c9aSwdenk
3126566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
3127566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
3128566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
3129566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
3130566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
3131566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
3132566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
3133566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
3134566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
3135566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
3136566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
3137566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
3138566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
3139566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
3140566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
3141566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
3142566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
3143566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
3144566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
3145566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
3146566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
3147566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
3148566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
3149566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
3150566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
3151566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
3152566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
3153566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
3154566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
3155566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
3156566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
3157566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
3158566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
3159566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
3160566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
3161566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
3162566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
3163566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
3164566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
3165566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
3166566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
3167566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
3168566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
3169566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
3170566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
3171566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
3172566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
3173c609719bSwdenk
3174566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
3175c609719bSwdenk
3176566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
3177566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
3178566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
3179206c60cbSwdenk
3180566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
3181566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
318211ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
3183566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
3184566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
3185566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
318674de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
318774de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
3188566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
3189c609719bSwdenk
31901372cce2SMarian BalakowiczFIT uImage format:
31911372cce2SMarian Balakowicz
31921372cce2SMarian Balakowicz  Arg	Where			When
31931372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
31941372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
31951372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
31961372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
31971372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
31981372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
3199f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
32001372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
32011372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
32021372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
32031372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
32041372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
320511ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
320611ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
32071372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
32081372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
32091372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
32101372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
32111372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
32121372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
32131372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
32141372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
32151372cce2SMarian Balakowicz
32161372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
32171372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
32181372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
321911ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
32201372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
32211372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
32221372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
32231372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
32241372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
32251372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
32261372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
32271372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
32281372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
32291372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
32301372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
32311372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
32321372cce2SMarian Balakowicz
323311ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
32341372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
32351372cce2SMarian Balakowicz
323611ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
32371372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
32381372cce2SMarian Balakowicz
323911ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
32401372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
32411372cce2SMarian Balakowicz
324221d29f7fSHeiko Schocher- legacy image format:
324321d29f7fSHeiko Schocher		CONFIG_IMAGE_FORMAT_LEGACY
324421d29f7fSHeiko Schocher		enables the legacy image format support in U-Boot.
324521d29f7fSHeiko Schocher
324621d29f7fSHeiko Schocher		Default:
324721d29f7fSHeiko Schocher		enabled if CONFIG_FIT_SIGNATURE is not defined.
324821d29f7fSHeiko Schocher
324921d29f7fSHeiko Schocher		CONFIG_DISABLE_IMAGE_LEGACY
325021d29f7fSHeiko Schocher		disable the legacy image format
325121d29f7fSHeiko Schocher
325221d29f7fSHeiko Schocher		This define is introduced, as the legacy image format is
325321d29f7fSHeiko Schocher		enabled per default for backward compatibility.
325421d29f7fSHeiko Schocher
3255d95f6ec7SGabe Black- FIT image support:
3256d95f6ec7SGabe Black		CONFIG_FIT
3257d95f6ec7SGabe Black		Enable support for the FIT uImage format.
3258d95f6ec7SGabe Black
3259d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
3260d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
3261d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
3262d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
3263d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
3264d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
3265d95f6ec7SGabe Black
32663e569a6bSSimon Glass		CONFIG_FIT_SIGNATURE
32673e569a6bSSimon Glass		This option enables signature verification of FIT uImages,
32683e569a6bSSimon Glass		using a hash signed and verified using RSA. See
32693e569a6bSSimon Glass		doc/uImage.FIT/signature.txt for more details.
32703e569a6bSSimon Glass
327121d29f7fSHeiko Schocher		WARNING: When relying on signed FIT images with required
327221d29f7fSHeiko Schocher		signature check the legacy image format is default
327321d29f7fSHeiko Schocher		disabled. If a board need legacy image format support
327421d29f7fSHeiko Schocher		enable this through CONFIG_IMAGE_FORMAT_LEGACY
327521d29f7fSHeiko Schocher
32769a4f479bSDirk Eibach		CONFIG_FIT_DISABLE_SHA256
32779a4f479bSDirk Eibach		Supporting SHA256 hashes has quite an impact on binary size.
32789a4f479bSDirk Eibach		For constrained systems sha256 hash support can be disabled
32799a4f479bSDirk Eibach		with this option.
32809a4f479bSDirk Eibach
32814cf2609bSWolfgang Denk- Standalone program support:
32824cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
32834cf2609bSWolfgang Denk
32846feff899SWolfgang Denk		This option defines a board specific value for the
32856feff899SWolfgang Denk		address where standalone program gets loaded, thus
32866feff899SWolfgang Denk		overwriting the architecture dependent default
32874cf2609bSWolfgang Denk		settings.
32884cf2609bSWolfgang Denk
32894cf2609bSWolfgang Denk- Frame Buffer Address:
32904cf2609bSWolfgang Denk		CONFIG_FB_ADDR
32914cf2609bSWolfgang Denk
32924cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
329344a53b57SWolfgang Denk		address for frame buffer.  This is typically the case
329444a53b57SWolfgang Denk		when using a graphics controller has separate video
329544a53b57SWolfgang Denk		memory.  U-Boot will then place the frame buffer at
329644a53b57SWolfgang Denk		the given address instead of dynamically reserving it
329744a53b57SWolfgang Denk		in system RAM by calling lcd_setmem(), which grabs
329844a53b57SWolfgang Denk		the memory for the frame buffer depending on the
329944a53b57SWolfgang Denk		configured panel size.
33004cf2609bSWolfgang Denk
33014cf2609bSWolfgang Denk		Please see board_init_f function.
33024cf2609bSWolfgang Denk
3303cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
3304cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
3305cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
3306cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
3307cccfc2abSDetlev Zundel
3308cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
3309cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
3310cccfc2abSDetlev Zundel
3311cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
3312cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
3313cccfc2abSDetlev Zundel
3314cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
3315cccfc2abSDetlev Zundel		Needed for mtdparts command support.
3316cccfc2abSDetlev Zundel
3317cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
3318cccfc2abSDetlev Zundel
3319cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
3320cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
3321cccfc2abSDetlev Zundel
332270c219cdSJoe Hershberger- UBI support
332370c219cdSJoe Hershberger		CONFIG_CMD_UBI
332470c219cdSJoe Hershberger
332570c219cdSJoe Hershberger		Adds commands for interacting with MTD partitions formatted
332670c219cdSJoe Hershberger		with the UBI flash translation layer
332770c219cdSJoe Hershberger
332870c219cdSJoe Hershberger		Requires also defining CONFIG_RBTREE
332970c219cdSJoe Hershberger
3330147162daSJoe Hershberger		CONFIG_UBI_SILENCE_MSG
3331147162daSJoe Hershberger
3332147162daSJoe Hershberger		Make the verbose messages from UBI stop printing.  This leaves
3333147162daSJoe Hershberger		warnings and errors enabled.
3334147162daSJoe Hershberger
333570c219cdSJoe Hershberger- UBIFS support
333670c219cdSJoe Hershberger		CONFIG_CMD_UBIFS
333770c219cdSJoe Hershberger
333870c219cdSJoe Hershberger		Adds commands for interacting with UBI volumes formatted as
333970c219cdSJoe Hershberger		UBIFS.  UBIFS is read-only in u-boot.
334070c219cdSJoe Hershberger
334170c219cdSJoe Hershberger		Requires UBI support as well as CONFIG_LZO
334270c219cdSJoe Hershberger
3343147162daSJoe Hershberger		CONFIG_UBIFS_SILENCE_MSG
3344147162daSJoe Hershberger
3345147162daSJoe Hershberger		Make the verbose messages from UBIFS stop printing.  This leaves
3346147162daSJoe Hershberger		warnings and errors enabled.
3347147162daSJoe Hershberger
33486a11cf48SDaniel Schwierzeck- SPL framework
33496a11cf48SDaniel Schwierzeck		CONFIG_SPL
33506a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
33516a11cf48SDaniel Schwierzeck
335295579793STom Rini		CONFIG_SPL_LDSCRIPT
335395579793STom Rini		LDSCRIPT for linking the SPL binary.
335495579793STom Rini
33556ebc3461SAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT
33566ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL, BSS included.
33576ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory
33586ebc3461SAlbert ARIBAUD		used by SPL from _start to __bss_end does not exceed it.
33598960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
33606ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
33616ebc3461SAlbert ARIBAUD
336295579793STom Rini		CONFIG_SPL_MAX_SIZE
33636ebc3461SAlbert ARIBAUD		Maximum size of the SPL image (text, data, rodata, and
33646ebc3461SAlbert ARIBAUD		linker lists sections), BSS excluded.
33656ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual size does
33666ebc3461SAlbert ARIBAUD		not exceed it.
336795579793STom Rini
33686a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
33696a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
33706a11cf48SDaniel Schwierzeck
337194a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
337294a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
337394a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
337494a45bb1SScott Wood
337595579793STom Rini		CONFIG_SPL_BSS_START_ADDR
337695579793STom Rini		Link address for the BSS within the SPL binary.
337795579793STom Rini
337895579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
33796ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL BSS.
33806ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory used
33816ebc3461SAlbert ARIBAUD		by SPL from __bss_start to __bss_end does not exceed it.
33828960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
33836ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
338495579793STom Rini
338595579793STom Rini		CONFIG_SPL_STACK
338695579793STom Rini		Adress of the start of the stack SPL will use
338795579793STom Rini
338894a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
338994a45bb1SScott Wood		Adress of the start of the stack SPL will use after
339094a45bb1SScott Wood		relocation.  If unspecified, this is equal to
339194a45bb1SScott Wood		CONFIG_SPL_STACK.
339294a45bb1SScott Wood
339395579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
339495579793STom Rini		Starting address of the malloc pool used in SPL.
339595579793STom Rini
339695579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
339795579793STom Rini		The size of the malloc pool used in SPL.
33986a11cf48SDaniel Schwierzeck
339947f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
340047f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
340147f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
340247f7bcaeSTom Rini		NAND loading of the Linux Kernel.
340347f7bcaeSTom Rini
34049607faf2STom Rini		CONFIG_SPL_OS_BOOT
34059607faf2STom Rini		Enable booting directly to an OS from SPL.
34069607faf2STom Rini		See also: doc/README.falcon
34079607faf2STom Rini
3408861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
3409861a86f4STom Rini		For ARM, enable an optional function to print more information
3410861a86f4STom Rini		about the running system.
3411861a86f4STom Rini
34124b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
34134b919725SScott Wood		Arch init code should be built for a very small image
34144b919725SScott Wood
34156a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
34166a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
34176a11cf48SDaniel Schwierzeck
34186a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
34196a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
34206a11cf48SDaniel Schwierzeck
34216a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
34226a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
34236a11cf48SDaniel Schwierzeck
34246a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
34256a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
34266a11cf48SDaniel Schwierzeck
34276a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
34286a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
34296a11cf48SDaniel Schwierzeck
343095579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
343195579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
343295579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
343395579793STom Rini		Address, size and partition on the MMC to load U-Boot from
343495579793STom Rini		when the MMC is being used in raw mode.
343595579793STom Rini
34362b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
34372b75b0adSPeter Korsgaard		Sector to load kernel uImage from when MMC is being
34382b75b0adSPeter Korsgaard		used in raw mode (for Falcon mode)
34392b75b0adSPeter Korsgaard
34402b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
34412b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
34422b75b0adSPeter Korsgaard		Sector and number of sectors to load kernel argument
34432b75b0adSPeter Korsgaard		parameters from when MMC is being used in raw mode
34442b75b0adSPeter Korsgaard		(for falcon mode)
34452b75b0adSPeter Korsgaard
344695579793STom Rini		CONFIG_SPL_FAT_SUPPORT
344795579793STom Rini		Support for fs/fat/libfat.o in SPL binary
344895579793STom Rini
344995579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
345095579793STom Rini		Filename to read to load U-Boot when reading from FAT
345195579793STom Rini
34527ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_KERNEL_NAME
34537ad2cc79SPeter Korsgaard		Filename to read to load kernel uImage when reading
34547ad2cc79SPeter Korsgaard		from FAT (for Falcon mode)
34557ad2cc79SPeter Korsgaard
34567ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_ARGS_NAME
34577ad2cc79SPeter Korsgaard		Filename to read to load kernel argument parameters
34587ad2cc79SPeter Korsgaard		when reading from FAT (for Falcon mode)
34597ad2cc79SPeter Korsgaard
346006f60ae3SScott Wood		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
346106f60ae3SScott Wood		Set this for NAND SPL on PPC mpc83xx targets, so that
346206f60ae3SScott Wood		start.S waits for the rest of the SPL to load before
346306f60ae3SScott Wood		continuing (the hardware starts execution after just
346406f60ae3SScott Wood		loading the first page rather than the full 4K).
346506f60ae3SScott Wood
3466651fcf60SPrabhakar Kushwaha		CONFIG_SPL_SKIP_RELOCATE
3467651fcf60SPrabhakar Kushwaha		Avoid SPL relocation
3468651fcf60SPrabhakar Kushwaha
34696f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
34706f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
34716f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
34726f2f01b9SScott Wood
34736f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
34746f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
34756f2f01b9SScott Wood
34766f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
34776f2f01b9SScott Wood		Include standard software ECC in the SPL
34786f2f01b9SScott Wood
347995579793STom Rini		CONFIG_SPL_NAND_SIMPLE
34807d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
34817d4b7955SScott Wood		expose the cmd_ctrl() interface.
348295579793STom Rini
34836dd3b566STom Rini		CONFIG_SPL_MTD_SUPPORT
34846dd3b566STom Rini		Support for the MTD subsystem within SPL.  Useful for
34856dd3b566STom Rini		environment on NAND support within SPL.
34866dd3b566STom Rini
3487bb0dc108SYing Zhang		CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
3488bb0dc108SYing Zhang		Set for the SPL on PPC mpc8xxx targets, support for
34895614e71bSYork Sun		drivers/ddr/fsl/libddr.o in SPL binary.
3490bb0dc108SYing Zhang
34917c8eea59SYing Zhang		CONFIG_SPL_COMMON_INIT_DDR
34927c8eea59SYing Zhang		Set for common ddr init with serial presence detect in
34937c8eea59SYing Zhang		SPL binary.
34947c8eea59SYing Zhang
349595579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
349695579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
349795579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
349895579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
349995579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
350095579793STom Rini		Defines the size and behavior of the NAND that SPL uses
35017d4b7955SScott Wood		to read U-Boot
350295579793STom Rini
3503fbe76ae4SPrabhakar Kushwaha		CONFIG_SPL_NAND_BOOT
3504fbe76ae4SPrabhakar Kushwaha		Add support NAND boot
3505fbe76ae4SPrabhakar Kushwaha
350695579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
35077d4b7955SScott Wood		Location in NAND to read U-Boot from
35087d4b7955SScott Wood
35097d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
35107d4b7955SScott Wood		Location in memory to load U-Boot to
35117d4b7955SScott Wood
35127d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
35137d4b7955SScott Wood		Size of image to load
351495579793STom Rini
351595579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
35167d4b7955SScott Wood		Entry point in loaded image to jump to
351795579793STom Rini
351895579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
351995579793STom Rini		Define this if you need to first read the OOB and then the
352095579793STom Rini		data. This is used for example on davinci plattforms.
352195579793STom Rini
352295579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
352395579793STom Rini		Support for an OMAP3-specific set of functions to return the
352495579793STom Rini		ID and MFR of the first attached NAND chip, if present.
352595579793STom Rini
35266a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
35276a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
35286a11cf48SDaniel Schwierzeck
35296a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
35306a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
35316a11cf48SDaniel Schwierzeck
35326a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
35336a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
35346a11cf48SDaniel Schwierzeck
3535c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
3536c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
3537c57b953dSPavel Machek
35386a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
35396a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
35401372cce2SMarian Balakowicz
3541ba1bee43SYing Zhang		CONFIG_SPL_ENV_SUPPORT
3542ba1bee43SYing Zhang		Support for the environment operating in SPL binary
3543ba1bee43SYing Zhang
3544ba1bee43SYing Zhang		CONFIG_SPL_NET_SUPPORT
3545ba1bee43SYing Zhang		Support for the net/libnet.o in SPL binary.
3546ba1bee43SYing Zhang		It conflicts with SPL env from storage medium specified by
3547ba1bee43SYing Zhang		CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3548ba1bee43SYing Zhang
354974752baaSScott Wood		CONFIG_SPL_PAD_TO
35506113d3f2SBenoît Thébaudeau		Image offset to which the SPL should be padded before appending
35516113d3f2SBenoît Thébaudeau		the SPL payload. By default, this is defined as
35526113d3f2SBenoît Thébaudeau		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
35536113d3f2SBenoît Thébaudeau		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
35546113d3f2SBenoît Thébaudeau		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
355574752baaSScott Wood
3556ca2fca22SScott Wood		CONFIG_SPL_TARGET
3557ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
3558ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
3559ca2fca22SScott Wood		example if more than one image needs to be produced.
3560ca2fca22SScott Wood
356187ebee39SSimon Glass		CONFIG_FIT_SPL_PRINT
356287ebee39SSimon Glass		Printing information about a FIT image adds quite a bit of
356387ebee39SSimon Glass		code to SPL. So this is normally disabled in SPL. Use this
356487ebee39SSimon Glass		option to re-enable it. This will affect the output of the
356587ebee39SSimon Glass		bootm command when booting a FIT image.
356687ebee39SSimon Glass
35673aa29de0SYing Zhang- TPL framework
35683aa29de0SYing Zhang		CONFIG_TPL
35693aa29de0SYing Zhang		Enable building of TPL globally.
35703aa29de0SYing Zhang
35713aa29de0SYing Zhang		CONFIG_TPL_PAD_TO
35723aa29de0SYing Zhang		Image offset to which the TPL should be padded before appending
35733aa29de0SYing Zhang		the TPL payload. By default, this is defined as
35743aa29de0SYing Zhang		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
35753aa29de0SYing Zhang		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
35763aa29de0SYing Zhang		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
35773aa29de0SYing Zhang
3578c609719bSwdenkModem Support:
3579c609719bSwdenk--------------
3580c609719bSwdenk
3581566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
3582c609719bSwdenk
358311ccc33fSMarcel Ziswiler- Modem support enable:
3584c609719bSwdenk		CONFIG_MODEM_SUPPORT
3585c609719bSwdenk
3586c609719bSwdenk- RTS/CTS Flow control enable:
3587c609719bSwdenk		CONFIG_HWFLOW
3588c609719bSwdenk
3589c609719bSwdenk- Modem debug support:
3590c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
3591c609719bSwdenk
3592c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
3593c609719bSwdenk		for modem support. Useful only with BDI2000.
3594c609719bSwdenk
3595a8c7c708Swdenk- Interrupt support (PPC):
3596a8c7c708Swdenk
3597a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
3598a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
359911ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
3600a8c7c708Swdenk		should set decrementer_count to appropriate value. If
360111ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
3602a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
360311ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
3604a8c7c708Swdenk		specific handling. If board has watchdog / status_led
3605a8c7c708Swdenk		/ other_activity_monitor it works automatically from
3606a8c7c708Swdenk		general timer_interrupt().
3607a8c7c708Swdenk
3608c609719bSwdenk- General:
3609c609719bSwdenk
3610c609719bSwdenk		In the target system modem support is enabled when a
3611c609719bSwdenk		specific key (key combination) is pressed during
3612c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
361311ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
3614c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
3615c609719bSwdenk		function, returning 1 and thus enabling modem
3616c609719bSwdenk		initialization.
3617c609719bSwdenk
3618c609719bSwdenk		If there are no modem init strings in the
3619c609719bSwdenk		environment, U-Boot proceed to autoboot; the
3620c609719bSwdenk		previous output (banner, info printfs) will be
362111ccc33fSMarcel Ziswiler		suppressed, though.
3622c609719bSwdenk
3623c609719bSwdenk		See also: doc/README.Modem
3624c609719bSwdenk
36259660e442SHelmut RaigerBoard initialization settings:
36269660e442SHelmut Raiger------------------------------
36279660e442SHelmut Raiger
36289660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
36299660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
36309660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
36319660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
36329660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
36339660e442SHelmut Raigertypically in board_init_f() and board_init_r().
36349660e442SHelmut Raiger
36359660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
36369660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
36379660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
36389660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3639c609719bSwdenk
3640c609719bSwdenkConfiguration Settings:
3641c609719bSwdenk-----------------------
3642c609719bSwdenk
36434d1fd7f1SYork Sun- CONFIG_SYS_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit.
36444d1fd7f1SYork Sun		Optionally it can be defined to support 64-bit memory commands.
36454d1fd7f1SYork Sun
36466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3647c609719bSwdenk		undefine this when you're short of memory.
3648c609719bSwdenk
36492fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
36502fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
36512fb2604dSPeter Tyser
36526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
3653c609719bSwdenk		prompt for user input.
3654c609719bSwdenk
36556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
3656c609719bSwdenk
36576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
3658c609719bSwdenk
36596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
3660c609719bSwdenk
36616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3662c609719bSwdenk		the application (usually a Linux kernel) when it is
3663c609719bSwdenk		booted
3664c609719bSwdenk
36656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
3666c609719bSwdenk		List of legal baudrate settings for this board.
3667c609719bSwdenk
36686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
3669c609719bSwdenk		Suppress display of console information at boot.
3670c609719bSwdenk
36716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
3672c609719bSwdenk		If the board specific function
3673c609719bSwdenk			extern int overwrite_console (void);
3674c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
3675c609719bSwdenk		serial port, else the settings in the environment are used.
3676c609719bSwdenk
36776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3678c609719bSwdenk		Enable the call to overwrite_console().
3679c609719bSwdenk
36806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3681c609719bSwdenk		Enable overwrite of previous console environment settings.
3682c609719bSwdenk
36836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3684c609719bSwdenk		Begin and End addresses of the area used by the
3685c609719bSwdenk		simple memory test.
3686c609719bSwdenk
36876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
3688c609719bSwdenk		Enable an alternate, more extensive memory test.
3689c609719bSwdenk
36906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
36915f535fe1Swdenk		Scratch address used by the alternate memory test
36925f535fe1Swdenk		You only need to set this if address zero isn't writeable
36935f535fe1Swdenk
36946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
36956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
369614f73ca6SStefan Roese		this specified memory area will get subtracted from the top
369711ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
369814f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
369914f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
370014f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
37015e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
370214f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
37035e12e75dSStefan Roese		will have to get fixed in Linux additionally.
370414f73ca6SStefan Roese
370514f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
370614f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
370714f73ca6SStefan Roese		be touched.
370814f73ca6SStefan Roese
370914f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
371014f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
371114f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
371214f73ca6SStefan Roese		non page size aligned address and this could cause major
371314f73ca6SStefan Roese		problems.
371414f73ca6SStefan Roese
37156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
3716c609719bSwdenk		Enable temporary baudrate change while serial download
3717c609719bSwdenk
37186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
3719c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
3720c609719bSwdenk
37216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
3722c609719bSwdenk		Physical start address of Motherboard I/O (if using a
3723c609719bSwdenk		Cogent motherboard)
3724c609719bSwdenk
37256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
3726c609719bSwdenk		Physical start address of Flash memory.
3727c609719bSwdenk
37286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
3729c609719bSwdenk		Physical start address of boot monitor code (set by
3730c609719bSwdenk		make config files to be same as the text base address
373114d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
37326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
3733c609719bSwdenk
37346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
37353b57fe0aSwdenk		Size of memory reserved for monitor code, used to
37363b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
37373b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
37383b57fe0aSwdenk		flash sector.
3739c609719bSwdenk
37406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
3741c609719bSwdenk		Size of DRAM reserved for malloc() use.
3742c609719bSwdenk
3743d59476b6SSimon Glass- CONFIG_SYS_MALLOC_F_LEN
3744d59476b6SSimon Glass		Size of the malloc() pool for use before relocation. If
3745d59476b6SSimon Glass		this is defined, then a very simple malloc() implementation
3746d59476b6SSimon Glass		will become available before relocation. The address is just
3747d59476b6SSimon Glass		below the global data, and the stack is moved down to make
3748d59476b6SSimon Glass		space.
3749d59476b6SSimon Glass
3750d59476b6SSimon Glass		This feature allocates regions with increasing addresses
3751d59476b6SSimon Glass		within the region. calloc() is supported, but realloc()
3752d59476b6SSimon Glass		is not available. free() is supported but does nothing.
3753d59476b6SSimon Glass		The memory will be freed (or in fact just forgotton) when
3754d59476b6SSimon Glass		U-Boot relocates itself.
3755d59476b6SSimon Glass
375629afe9e6SSimon Glass		Pre-relocation malloc() is only supported on sandbox
375729afe9e6SSimon Glass		at present but is fairly easy to enable for other archs.
375829afe9e6SSimon Glass
375976a1e584SSimon Glass		Pre-relocation malloc() is only supported on ARM at present
376076a1e584SSimon Glass		but is fairly easy to enable for other archs.
376176a1e584SSimon Glass
37626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
376315940c9aSStefan Roese		Normally compressed uImages are limited to an
376415940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
37656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
376615940c9aSStefan Roese		to adjust this setting to your needs.
3767c609719bSwdenk
37686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
3769c609719bSwdenk		Maximum size of memory mapped by the startup code of
3770c609719bSwdenk		the Linux kernel; all data that must be processed by
37717d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
37727d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
37731bce2aebSRobert P. J. Day		environment variable is defined and non-zero. In such case
37747d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
3775c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
3776c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
3777c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
3778c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
3779c609719bSwdenk
3780fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3781fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
3782fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
3783fca43cc8SJohn Rigby		is enabled.
3784fca43cc8SJohn Rigby
3785fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3786fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3787fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3788fca43cc8SJohn Rigby
3789fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3790fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3791fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3792fca43cc8SJohn Rigby
37936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3794c609719bSwdenk		Max number of Flash memory banks
3795c609719bSwdenk
37966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3797c609719bSwdenk		Max number of sectors on a Flash chip
3798c609719bSwdenk
37996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3800c609719bSwdenk		Timeout for Flash erase operations (in ms)
3801c609719bSwdenk
38026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3803c609719bSwdenk		Timeout for Flash write operations (in ms)
3804c609719bSwdenk
38056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
38068564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
38078564acf9Swdenk
38086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
38098564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
38108564acf9Swdenk
38116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
38128564acf9Swdenk		If defined, hardware flash sectors protection is used
38138564acf9Swdenk		instead of U-Boot software protection.
38148564acf9Swdenk
38156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3816c609719bSwdenk
3817c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3818c609719bSwdenk		without this option such a download has to be
3819c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3820c609719bSwdenk		copy from RAM to flash.
3821c609719bSwdenk
3822c609719bSwdenk		The two-step approach is usually more reliable, since
3823c609719bSwdenk		you can check if the download worked before you erase
382411ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
382511ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3826c609719bSwdenk		downloaded image) this option may be very useful.
3827c609719bSwdenk
38286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3829c609719bSwdenk		Define if the flash driver uses extra elements in the
38305653fc33Swdenk		common flash structure for storing flash geometry.
38315653fc33Swdenk
383200b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
38335653fc33Swdenk		This option also enables the building of the cfi_flash driver
38345653fc33Swdenk		in the drivers directory
383553cf9435Sstroese
383691809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
383791809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
383891809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
383991809ed5SPiotr Ziecik		to the MTD layer.
384091809ed5SPiotr Ziecik
38416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
384296ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
384396ef831fSGuennadi Liakhovetski
384496ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
384596ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
384696ef831fSGuennadi Liakhovetski		write commands.
384796ef831fSGuennadi Liakhovetski
38486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
38495568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
38505568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
38515568e613SStefan Roese		is useful, if some of the configured banks are only
38525568e613SStefan Roese		optionally available.
38535568e613SStefan Roese
38549a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
38559a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
38569a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
38579a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
38589a042e9cSJerry Van Baren
3859352ef3f1SStefan Roese- CONFIG_FLASH_VERIFY
3860352ef3f1SStefan Roese		If defined, the content of the flash (destination) is compared
3861352ef3f1SStefan Roese		against the source after the write operation. An error message
3862352ef3f1SStefan Roese		will be printed when the contents are not identical.
3863352ef3f1SStefan Roese		Please note that this option is useless in nearly all cases,
3864352ef3f1SStefan Roese		since such flash programming errors usually are detected earlier
3865352ef3f1SStefan Roese		while unprotecting/erasing/programming. Please only enable
3866352ef3f1SStefan Roese		this option if you really know what you are doing.
3867352ef3f1SStefan Roese
38686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
386911ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
387011ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
387153cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
387253cf9435Sstroese		buffers can be full shortly after enabling the interface
387311ccc33fSMarcel Ziswiler		on high Ethernet traffic.
387453cf9435Sstroese		Defaults to 4 if not defined.
3875c609719bSwdenk
3876ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3877ea882bafSWolfgang Denk
3878ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3879ea882bafSWolfgang Denk	internally to store the environment settings. The default
3880ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3881ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3882ea882bafSWolfgang Denk	lib/hashtable.c for details.
3883ea882bafSWolfgang Denk
38842598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_DEFAULT
38852598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_STATIC
38861bce2aebSRobert P. J. Day	Enable validation of the values given to environment variables when
38872598090bSJoe Hershberger	calling env set.  Variables can be restricted to only decimal,
38882598090bSJoe Hershberger	hexadecimal, or boolean.  If CONFIG_CMD_NET is also defined,
38892598090bSJoe Hershberger	the variables can also be restricted to IP address or MAC address.
38902598090bSJoe Hershberger
38912598090bSJoe Hershberger	The format of the list is:
38922598090bSJoe Hershberger		type_attribute = [s|d|x|b|i|m]
3893267541f7SJoe Hershberger		access_atribute = [a|r|o|c]
3894267541f7SJoe Hershberger		attributes = type_attribute[access_atribute]
38952598090bSJoe Hershberger		entry = variable_name[:attributes]
38962598090bSJoe Hershberger		list = entry[,list]
38972598090bSJoe Hershberger
38982598090bSJoe Hershberger	The type attributes are:
38992598090bSJoe Hershberger		s - String (default)
39002598090bSJoe Hershberger		d - Decimal
39012598090bSJoe Hershberger		x - Hexadecimal
39022598090bSJoe Hershberger		b - Boolean ([1yYtT|0nNfF])
39032598090bSJoe Hershberger		i - IP address
39042598090bSJoe Hershberger		m - MAC address
39052598090bSJoe Hershberger
3906267541f7SJoe Hershberger	The access attributes are:
3907267541f7SJoe Hershberger		a - Any (default)
3908267541f7SJoe Hershberger		r - Read-only
3909267541f7SJoe Hershberger		o - Write-once
3910267541f7SJoe Hershberger		c - Change-default
3911267541f7SJoe Hershberger
39122598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_DEFAULT
39132598090bSJoe Hershberger		Define this to a list (string) to define the ".flags"
39142598090bSJoe Hershberger		envirnoment variable in the default or embedded environment.
39152598090bSJoe Hershberger
39162598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_STATIC
39172598090bSJoe Hershberger		Define this to a list (string) to define validation that
39182598090bSJoe Hershberger		should be done if an entry is not found in the ".flags"
39192598090bSJoe Hershberger		environment variable.  To override a setting in the static
39202598090bSJoe Hershberger		list, simply add an entry for the same variable name to the
39212598090bSJoe Hershberger		".flags" variable.
39222598090bSJoe Hershberger
3923267541f7SJoe Hershberger- CONFIG_ENV_ACCESS_IGNORE_FORCE
3924267541f7SJoe Hershberger	If defined, don't allow the -f switch to env set override variable
3925267541f7SJoe Hershberger	access flags.
3926267541f7SJoe Hershberger
39275c1a7ea6SSimon Glass- CONFIG_SYS_GENERIC_BOARD
39285c1a7ea6SSimon Glass	This selects the architecture-generic board system instead of the
39295c1a7ea6SSimon Glass	architecture-specific board files. It is intended to move boards
39305c1a7ea6SSimon Glass	to this new framework over time. Defining this will disable the
39315c1a7ea6SSimon Glass	arch/foo/lib/board.c file and use common/board_f.c and
39325c1a7ea6SSimon Glass	common/board_r.c instead. To use this option your architecture
39335c1a7ea6SSimon Glass	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
39345c1a7ea6SSimon Glass	its config.mk file). If you find problems enabling this option on
39355c1a7ea6SSimon Glass	your board please report the problem and send patches!
39365c1a7ea6SSimon Glass
39370b1b60c7SLokesh Vutla- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
39380b1b60c7SLokesh Vutla	This is set by OMAP boards for the max time that reset should
39390b1b60c7SLokesh Vutla	be asserted. See doc/README.omap-reset-time for details on how
39400b1b60c7SLokesh Vutla	the value can be calulated on a given board.
3941632efa74SSimon Glass
3942c609719bSwdenkThe following definitions that deal with the placement and management
3943c609719bSwdenkof environment data (variable area); in general, we support the
3944c609719bSwdenkfollowing configurations:
3945c609719bSwdenk
3946c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3947c3eb3fe4SMike Frysinger
3948c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3949c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3950c3eb3fe4SMike Frysinger
39515a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3952c609719bSwdenk
3953c609719bSwdenk	Define this if the environment is in flash memory.
3954c609719bSwdenk
3955c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3956c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3957c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3958c609719bSwdenk	   sector" type flash chips, which have several smaller
3959c609719bSwdenk	   sectors at the start or the end. For instance, such a
3960c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3961c609719bSwdenk	   such a case you would place the environment in one of the
3962c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3963c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3964c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3965c609719bSwdenk	   between U-Boot and the environment.
3966c609719bSwdenk
39670e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3968c609719bSwdenk
3969c609719bSwdenk	   Offset of environment data (variable area) to the
3970c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3971c609719bSwdenk	   type flash chips the second sector can be used: the offset
3972c609719bSwdenk	   for this sector is given here.
3973c609719bSwdenk
39746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3975c609719bSwdenk
39760e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3977c609719bSwdenk
3978c609719bSwdenk	   This is just another way to specify the start address of
3979c609719bSwdenk	   the flash sector containing the environment (instead of
39800e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3981c609719bSwdenk
39820e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3983c609719bSwdenk
3984c609719bSwdenk	   Size of the sector containing the environment.
3985c609719bSwdenk
3986c609719bSwdenk
3987c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3988c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3989c609719bSwdenk	   the environment.
3990c609719bSwdenk
39910e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3992c609719bSwdenk
39935a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
39940e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3995c609719bSwdenk	   of this flash sector for the environment. This saves
3996c609719bSwdenk	   memory for the RAM copy of the environment.
3997c609719bSwdenk
3998c609719bSwdenk	   It may also save flash memory if you decide to use this
3999c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
4000c609719bSwdenk	   since then the remainder of the flash sector could be used
4001c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
4002c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
4003c609719bSwdenk	   updating the environment in flash makes it always
4004c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
4005c609719bSwdenk	   wrong before the contents has been restored from a copy in
4006c609719bSwdenk	   RAM, your target system will be dead.
4007c609719bSwdenk
40080e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
40090e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
4010c609719bSwdenk
4011c609719bSwdenk	   These settings describe a second storage area used to hold
401211ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
40133e38691eSwdenk	   a valid backup copy in case there is a power failure during
4014c609719bSwdenk	   a "saveenv" operation.
4015c609719bSwdenk
4016c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
4017c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
4018c609719bSwdenkaccordingly!
4019c609719bSwdenk
4020c609719bSwdenk
40219314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
4022c609719bSwdenk
4023c609719bSwdenk	Define this if you have some non-volatile memory device
4024c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
4025c609719bSwdenk	environment.
4026c609719bSwdenk
40270e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
40280e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
4029c609719bSwdenk
403011ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
4031c609719bSwdenk	  want to use for environment. It is assumed that this memory
4032c609719bSwdenk	  can just be read and written to, without any special
4033c609719bSwdenk	  provision.
4034c609719bSwdenk
4035c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
4036c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
403711ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
4038c609719bSwdenkU-Boot will hang.
4039c609719bSwdenk
4040c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
4041c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
4042c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
4043c609719bSwdenkto save the current settings.
4044c609719bSwdenk
4045c609719bSwdenk
4046bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
4047c609719bSwdenk
4048c609719bSwdenk	Use this if you have an EEPROM or similar serial access
4049c609719bSwdenk	device and a driver for it.
4050c609719bSwdenk
40510e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
40520e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
4053c609719bSwdenk
4054c609719bSwdenk	  These two #defines specify the offset and size of the
4055c609719bSwdenk	  environment area within the total memory of your EEPROM.
4056c609719bSwdenk
40576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
4058c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
4059c609719bSwdenk	  The default address is zero.
4060c609719bSwdenk
40616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
4062c609719bSwdenk	  If defined, the number of bits used to address bytes in a
4063c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
4064c609719bSwdenk	  would require six bits.
4065c609719bSwdenk
40666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
4067c609719bSwdenk	  If defined, the number of milliseconds to delay between
4068c609719bSwdenk	  page writes.	The default is zero milliseconds.
4069c609719bSwdenk
40706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
4071c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
4072c609719bSwdenk	  that this is NOT the chip address length!
4073c609719bSwdenk
40746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
40755cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
40765cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
40775cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
40785cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
40795cf91d6bSwdenk	  byte chips.
40805cf91d6bSwdenk
40815cf91d6bSwdenk	  Note that we consider the length of the address field to
40825cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
40835cf91d6bSwdenk	  in the chip address.
40845cf91d6bSwdenk
40856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
4086c609719bSwdenk	  The size in bytes of the EEPROM device.
4087c609719bSwdenk
4088548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
4089548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
4090548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
4091548738b4SHeiko Schocher
4092548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
4093548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
4094548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
4095548738b4SHeiko Schocher	  EEPROM. For example:
4096548738b4SHeiko Schocher
4097ea818dbbSHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  1
4098548738b4SHeiko Schocher
4099548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
4100548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
4101c609719bSwdenk
4102057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
41035779d8d9Swdenk
41045779d8d9Swdenk	Define this if you have a DataFlash memory device which you
41055779d8d9Swdenk	want to use for the environment.
41065779d8d9Swdenk
41070e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
41080e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
41090e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
41105779d8d9Swdenk
41115779d8d9Swdenk	  These three #defines specify the offset and size of the
41125779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
41135779d8d9Swdenk	  at the specified address.
41145779d8d9Swdenk
4115bd83b592SWu, Josh- CONFIG_ENV_IS_IN_SPI_FLASH:
4116bd83b592SWu, Josh
4117bd83b592SWu, Josh	Define this if you have a SPI Flash memory device which you
4118bd83b592SWu, Josh	want to use for the environment.
4119bd83b592SWu, Josh
4120bd83b592SWu, Josh	- CONFIG_ENV_OFFSET:
4121bd83b592SWu, Josh	- CONFIG_ENV_SIZE:
4122bd83b592SWu, Josh
4123bd83b592SWu, Josh	  These two #defines specify the offset and size of the
4124bd83b592SWu, Josh	  environment area within the SPI Flash. CONFIG_ENV_OFFSET must be
4125bd83b592SWu, Josh	  aligned to an erase sector boundary.
4126bd83b592SWu, Josh
4127bd83b592SWu, Josh	- CONFIG_ENV_SECT_SIZE:
4128bd83b592SWu, Josh
4129bd83b592SWu, Josh	  Define the SPI flash's sector size.
4130bd83b592SWu, Josh
4131bd83b592SWu, Josh	- CONFIG_ENV_OFFSET_REDUND (optional):
4132bd83b592SWu, Josh
4133bd83b592SWu, Josh	  This setting describes a second storage area of CONFIG_ENV_SIZE
4134bd83b592SWu, Josh	  size used to hold a redundant copy of the environment data, so
4135bd83b592SWu, Josh	  that there is a valid backup copy in case there is a power failure
4136bd83b592SWu, Josh	  during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
4137bd83b592SWu, Josh	  aligned to an erase sector boundary.
4138bd83b592SWu, Josh
4139bd83b592SWu, Josh	- CONFIG_ENV_SPI_BUS (optional):
4140bd83b592SWu, Josh	- CONFIG_ENV_SPI_CS (optional):
4141bd83b592SWu, Josh
4142bd83b592SWu, Josh	  Define the SPI bus and chip select. If not defined they will be 0.
4143bd83b592SWu, Josh
4144bd83b592SWu, Josh	- CONFIG_ENV_SPI_MAX_HZ (optional):
4145bd83b592SWu, Josh
4146bd83b592SWu, Josh	  Define the SPI max work clock. If not defined then use 1MHz.
4147bd83b592SWu, Josh
4148bd83b592SWu, Josh	- CONFIG_ENV_SPI_MODE (optional):
4149bd83b592SWu, Josh
4150bd83b592SWu, Josh	  Define the SPI work mode. If not defined then use SPI_MODE_3.
4151bd83b592SWu, Josh
41520a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
41530a85a9e7SLiu Gang
41540a85a9e7SLiu Gang	Define this if you have a remote memory space which you
41550a85a9e7SLiu Gang	want to use for the local device's environment.
41560a85a9e7SLiu Gang
41570a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
41580a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
41590a85a9e7SLiu Gang
41600a85a9e7SLiu Gang	  These two #defines specify the address and size of the
41610a85a9e7SLiu Gang	  environment area within the remote memory space. The
41620a85a9e7SLiu Gang	  local device can get the environment from remote memory
4163fc54c7faSLiu Gang	  space by SRIO or PCIE links.
41640a85a9e7SLiu Gang
41650a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
41660a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
4167fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
4168fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
41690a85a9e7SLiu Gang
417051bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
417113a5695bSwdenk
417213a5695bSwdenk	Define this if you have a NAND device which you want to use
417313a5695bSwdenk	for the environment.
417413a5695bSwdenk
41750e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
41760e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
417713a5695bSwdenk
417813a5695bSwdenk	  These two #defines specify the offset and size of the environment
4179fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
4180fdd813deSScott Wood	  aligned to an erase block boundary.
41815779d8d9Swdenk
4182fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
4183e443c944SMarkus Klotzbuecher
41840e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
4185fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
4186fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
4187fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
4188fdd813deSScott Wood	  aligned to an erase block boundary.
4189e443c944SMarkus Klotzbuecher
4190fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
4191fdd813deSScott Wood
4192fdd813deSScott Wood	  Specifies the length of the region in which the environment
4193fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
4194fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
4195fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
4196fdd813deSScott Wood	  the range to be avoided.
4197fdd813deSScott Wood
4198fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
4199fdd813deSScott Wood
4200fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
4201fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
4202fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
4203fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
4204fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
4205e443c944SMarkus Klotzbuecher
4206b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
4207b74ab737SGuennadi Liakhovetski
4208b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
4209b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
4210b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
4211b74ab737SGuennadi Liakhovetski
42122b74433fSJoe Hershberger- CONFIG_ENV_IS_IN_UBI:
42132b74433fSJoe Hershberger
42142b74433fSJoe Hershberger	Define this if you have an UBI volume that you want to use for the
42152b74433fSJoe Hershberger	environment.  This has the benefit of wear-leveling the environment
42162b74433fSJoe Hershberger	accesses, which is important on NAND.
42172b74433fSJoe Hershberger
42182b74433fSJoe Hershberger	- CONFIG_ENV_UBI_PART:
42192b74433fSJoe Hershberger
42202b74433fSJoe Hershberger	  Define this to a string that is the mtd partition containing the UBI.
42212b74433fSJoe Hershberger
42222b74433fSJoe Hershberger	- CONFIG_ENV_UBI_VOLUME:
42232b74433fSJoe Hershberger
42242b74433fSJoe Hershberger	  Define this to the name of the volume that you want to store the
42252b74433fSJoe Hershberger	  environment in.
42262b74433fSJoe Hershberger
4227785881f7SJoe Hershberger	- CONFIG_ENV_UBI_VOLUME_REDUND:
4228785881f7SJoe Hershberger
4229785881f7SJoe Hershberger	  Define this to the name of another volume to store a second copy of
4230785881f7SJoe Hershberger	  the environment in.  This will enable redundant environments in UBI.
4231785881f7SJoe Hershberger	  It is assumed that both volumes are in the same MTD partition.
4232785881f7SJoe Hershberger
42332b74433fSJoe Hershberger	- CONFIG_UBI_SILENCE_MSG
42342b74433fSJoe Hershberger	- CONFIG_UBIFS_SILENCE_MSG
42352b74433fSJoe Hershberger
42362b74433fSJoe Hershberger	  You will probably want to define these to avoid a really noisy system
42372b74433fSJoe Hershberger	  when storing the env in UBI.
42382b74433fSJoe Hershberger
4239d1db76f1SWu, Josh- CONFIG_ENV_IS_IN_FAT:
4240d1db76f1SWu, Josh       Define this if you want to use the FAT file system for the environment.
4241d1db76f1SWu, Josh
4242d1db76f1SWu, Josh       - FAT_ENV_INTERFACE:
4243d1db76f1SWu, Josh
4244d1db76f1SWu, Josh         Define this to a string that is the name of the block device.
4245d1db76f1SWu, Josh
4246d1db76f1SWu, Josh       - FAT_ENV_DEV_AND_PART:
4247d1db76f1SWu, Josh
4248d1db76f1SWu, Josh         Define this to a string to specify the partition of the device. It can
4249d1db76f1SWu, Josh         be as following:
4250d1db76f1SWu, Josh
4251d1db76f1SWu, Josh           "D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
4252d1db76f1SWu, Josh               - "D:P": device D partition P. Error occurs if device D has no
4253d1db76f1SWu, Josh                        partition table.
4254d1db76f1SWu, Josh               - "D:0": device D.
4255d1db76f1SWu, Josh               - "D" or "D:": device D partition 1 if device D has partition
4256d1db76f1SWu, Josh                              table, or the whole device D if has no partition
4257d1db76f1SWu, Josh                              table.
4258d1db76f1SWu, Josh               - "D:auto": first partition in device D with bootable flag set.
4259d1db76f1SWu, Josh                           If none, first valid paratition in device D. If no
4260d1db76f1SWu, Josh                           partition table then means device D.
4261d1db76f1SWu, Josh
4262d1db76f1SWu, Josh       - FAT_ENV_FILE:
4263d1db76f1SWu, Josh
4264d1db76f1SWu, Josh         It's a string of the FAT file name. This file use to store the
4265d1db76f1SWu, Josh         envrionment.
4266d1db76f1SWu, Josh
4267d1db76f1SWu, Josh       - CONFIG_FAT_WRITE:
4268d1db76f1SWu, Josh         This should be defined. Otherwise it cannot save the envrionment file.
4269d1db76f1SWu, Josh
427006e4ae5fSStephen Warren- CONFIG_ENV_IS_IN_MMC:
427106e4ae5fSStephen Warren
427206e4ae5fSStephen Warren	Define this if you have an MMC device which you want to use for the
427306e4ae5fSStephen Warren	environment.
427406e4ae5fSStephen Warren
427506e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_DEV:
427606e4ae5fSStephen Warren
427706e4ae5fSStephen Warren	  Specifies which MMC device the environment is stored in.
427806e4ae5fSStephen Warren
427906e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_PART (optional):
428006e4ae5fSStephen Warren
428106e4ae5fSStephen Warren	  Specifies which MMC partition the environment is stored in. If not
428206e4ae5fSStephen Warren	  set, defaults to partition 0, the user area. Common values might be
428306e4ae5fSStephen Warren	  1 (first MMC boot partition), 2 (second MMC boot partition).
428406e4ae5fSStephen Warren
428506e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET:
428606e4ae5fSStephen Warren	- CONFIG_ENV_SIZE:
428706e4ae5fSStephen Warren
428806e4ae5fSStephen Warren	  These two #defines specify the offset and size of the environment
428906e4ae5fSStephen Warren	  area within the specified MMC device.
429006e4ae5fSStephen Warren
42915c088ee8SStephen Warren	  If offset is positive (the usual case), it is treated as relative to
42925c088ee8SStephen Warren	  the start of the MMC partition. If offset is negative, it is treated
42935c088ee8SStephen Warren	  as relative to the end of the MMC partition. This can be useful if
42945c088ee8SStephen Warren	  your board may be fitted with different MMC devices, which have
42955c088ee8SStephen Warren	  different sizes for the MMC partitions, and you always want the
42965c088ee8SStephen Warren	  environment placed at the very end of the partition, to leave the
42975c088ee8SStephen Warren	  maximum possible space before it, to store other data.
42985c088ee8SStephen Warren
429906e4ae5fSStephen Warren	  These two values are in units of bytes, but must be aligned to an
430006e4ae5fSStephen Warren	  MMC sector boundary.
430106e4ae5fSStephen Warren
430206e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET_REDUND (optional):
430306e4ae5fSStephen Warren
430406e4ae5fSStephen Warren	  Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
430506e4ae5fSStephen Warren	  hold a redundant copy of the environment data. This provides a
430606e4ae5fSStephen Warren	  valid backup copy in case the other copy is corrupted, e.g. due
430706e4ae5fSStephen Warren	  to a power failure during a "saveenv" operation.
430806e4ae5fSStephen Warren
43095c088ee8SStephen Warren	  This value may also be positive or negative; this is handled in the
43105c088ee8SStephen Warren	  same way as CONFIG_ENV_OFFSET.
43115c088ee8SStephen Warren
431206e4ae5fSStephen Warren	  This value is also in units of bytes, but must also be aligned to
431306e4ae5fSStephen Warren	  an MMC sector boundary.
431406e4ae5fSStephen Warren
431506e4ae5fSStephen Warren	- CONFIG_ENV_SIZE_REDUND (optional):
431606e4ae5fSStephen Warren
431706e4ae5fSStephen Warren	  This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
431806e4ae5fSStephen Warren	  set. If this value is set, it must be set to the same value as
431906e4ae5fSStephen Warren	  CONFIG_ENV_SIZE.
432006e4ae5fSStephen Warren
43216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
4322c609719bSwdenk
4323c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
4324c609719bSwdenk	area is used at an early stage (ROM part) if the environment
4325c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
4326c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
4327c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
4328c609719bSwdenk	to be a good choice since it makes it far enough from the
4329c609719bSwdenk	start of the data area as well as from the stack pointer.
4330c609719bSwdenk
4331e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
4332c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
4333cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
4334c609719bSwdenkuntil then to read environment variables.
4335c609719bSwdenk
433685ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
433785ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
433885ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
433985ec0bccSwdenknecessary, because the first environment variable we need is the
434085ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
434185ec0bccSwdenkhave any device yet where we could complain.]
4342c609719bSwdenk
4343c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
4344c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
434585ec0bccSwdenkuse the "saveenv" command to store a valid environment.
4346c609719bSwdenk
43476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
4348fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
4349fc3e2165Swdenk
43506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
4351fc3e2165Swdenk		      also needs to be defined.
4352fc3e2165Swdenk
43536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
4354fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
4355c609719bSwdenk
4356f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
4357f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
4358f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
4359f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
4360f5675aa5SRon Madrid		space for already greatly restricted images, including but not
4361f5675aa5SRon Madrid		limited to NAND_SPL configurations.
4362f5675aa5SRon Madrid
4363b2b92f53SSimon Glass- CONFIG_DISPLAY_BOARDINFO
4364b2b92f53SSimon Glass		Display information about the board that U-Boot is running on
4365b2b92f53SSimon Glass		when U-Boot starts up. The board function checkboard() is called
4366b2b92f53SSimon Glass		to do this.
4367b2b92f53SSimon Glass
4368e2e3e2b1SSimon Glass- CONFIG_DISPLAY_BOARDINFO_LATE
4369e2e3e2b1SSimon Glass		Similar to the previous option, but display this information
4370e2e3e2b1SSimon Glass		later, once stdio is running and output goes to the LCD, if
4371e2e3e2b1SSimon Glass		present.
4372e2e3e2b1SSimon Glass
4373c609719bSwdenkLow Level (hardware related) configuration options:
4374dc7c9a1aSwdenk---------------------------------------------------
4375c609719bSwdenk
43766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
4377c609719bSwdenk		Cache Line Size of the CPU.
4378c609719bSwdenk
43796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
4380c609719bSwdenk		Default address of the IMMR after system reset.
43812535d602Swdenk
43822535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
43832535d602Swdenk		and RPXsuper) to be able to adjust the position of
43842535d602Swdenk		the IMMR register after a reset.
4385c609719bSwdenk
4386e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
4387e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
4388e46fedfeSTimur Tabi		PowerPC SOCs.
4389e46fedfeSTimur Tabi
4390e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
4391e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
4392e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
4393e46fedfeSTimur Tabi
4394e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
4395e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
4396e46fedfeSTimur Tabi
4397e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
4398e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
4399e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
4400e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
4401e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
4402e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
4403e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
4404e46fedfeSTimur Tabi
4405e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
4406e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
4407e46fedfeSTimur Tabi
4408e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
4409e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
4410e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
4411e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
4412e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
4413e46fedfeSTimur Tabi
4414e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
4415e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
4416e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
4417e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
4418e46fedfeSTimur Tabi
4419e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
4420e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
4421e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
4422e46fedfeSTimur Tabi
44237f6c2cbcSwdenk- Floppy Disk Support:
44246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
44257f6c2cbcSwdenk
44267f6c2cbcSwdenk		the default drive number (default value 0)
44277f6c2cbcSwdenk
44286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
44297f6c2cbcSwdenk
443011ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
44317f6c2cbcSwdenk		(default value 1)
44327f6c2cbcSwdenk
44336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
44347f6c2cbcSwdenk
44357f6c2cbcSwdenk		defines the offset of register from address. It
44367f6c2cbcSwdenk		depends on which part of the data bus is connected to
443711ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
44387f6c2cbcSwdenk
44396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
44406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
44417f6c2cbcSwdenk		default value.
44427f6c2cbcSwdenk
44436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
44447f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
44457f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
44467f6c2cbcSwdenk		source code. It is used to make hardware dependant
44477f6c2cbcSwdenk		initializations.
44487f6c2cbcSwdenk
44490abddf82SMacpaul Lin- CONFIG_IDE_AHB:
44500abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
44510abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
44520abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
44530abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
44540abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
44550abddf82SMacpaul Lin		is requierd.
44560abddf82SMacpaul Lin
44576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
445825d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
445925d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
4460c609719bSwdenk
44616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
4462c609719bSwdenk
44637152b1d0Swdenk		Start address of memory area that can be used for
4464c609719bSwdenk		initial data and stack; please note that this must be
4465c609719bSwdenk		writable memory that is working WITHOUT special
4466c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
4467c609719bSwdenk		will become available only after programming the
4468c609719bSwdenk		memory controller and running certain initialization
4469c609719bSwdenk		sequences.
4470c609719bSwdenk
4471c609719bSwdenk		U-Boot uses the following memory types:
4472c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
4473c609719bSwdenk		- MPC824X: data cache
4474c609719bSwdenk		- PPC4xx:  data cache
4475c609719bSwdenk
44766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
4477c609719bSwdenk
4478c609719bSwdenk		Offset of the initial data structure in the memory
44796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
44806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
4481c609719bSwdenk		data is located at the end of the available space
4482553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
44836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
44846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
44856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
4486c609719bSwdenk
4487c609719bSwdenk	Note:
4488c609719bSwdenk		On the MPC824X (or other systems that use the data
4489c609719bSwdenk		cache for initial memory) the address chosen for
44906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
4491c609719bSwdenk		point to an otherwise UNUSED address space between
4492c609719bSwdenk		the top of RAM and the start of the PCI space.
4493c609719bSwdenk
44946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
4495c609719bSwdenk
44966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
4497c609719bSwdenk
44986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
4499c609719bSwdenk
45006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
4501c609719bSwdenk
45026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
4503c609719bSwdenk
45046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
4505c609719bSwdenk
45066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
4507c609719bSwdenk		SDRAM timing
4508c609719bSwdenk
45096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
4510c609719bSwdenk		periodic timer for refresh
4511c609719bSwdenk
45126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
4513c609719bSwdenk
45146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
45156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
45166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
45176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
4518c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
4519c609719bSwdenk
4520c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
45216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
45226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
4523c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
4524c609719bSwdenk
45256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
45266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
4527c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
4528c609719bSwdenk		Prescaler definitions (SDRAM timing)
4529c609719bSwdenk
45306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
4531c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
4532c609719bSwdenk		define relocation offset in DPRAM [DSP2]
4533c609719bSwdenk
45346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
4535b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
4536b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
4537b423d055SHeiko Schocher
45386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
4539c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
4540c609719bSwdenk		define relocation offset in DPRAM [SCC4]
4541c609719bSwdenk
45426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
4543c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
4544c609719bSwdenk		wrong setting might damage your board. Read
4545c609719bSwdenk		doc/README.MBX before setting this variable!
4546c609719bSwdenk
45476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
4548ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
4549ea909b76Swdenk		(Power On Self Tests). This definition overrides
4550ea909b76Swdenk		#define'd default value in commproc.h resp.
4551ea909b76Swdenk		cpm_8260.h.
4552ea909b76Swdenk
45536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
45546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
45556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
45566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
45576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
45586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
45596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
45606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
4561a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
45625d232d0eSwdenk
45639cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
45649cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
45659cacf4fcSDirk Eibach		required.
45669cacf4fcSDirk Eibach
456769fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
456869fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
456969fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
457069fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
457169fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
457269fd2d3bSAndrew Sharp		by coreboot or similar.
457369fd2d3bSAndrew Sharp
4574842033e6SGabor Juhos- CONFIG_PCI_INDIRECT_BRIDGE:
4575842033e6SGabor Juhos		Enable support for indirect PCI bridges.
4576842033e6SGabor Juhos
4577a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
4578a09b9b68SKumar Gala		Chip has SRIO or not
4579a09b9b68SKumar Gala
4580a09b9b68SKumar Gala- CONFIG_SRIO1:
4581a09b9b68SKumar Gala		Board has SRIO 1 port available
4582a09b9b68SKumar Gala
4583a09b9b68SKumar Gala- CONFIG_SRIO2:
4584a09b9b68SKumar Gala		Board has SRIO 2 port available
4585a09b9b68SKumar Gala
4586c8b28152SLiu Gang- CONFIG_SRIO_PCIE_BOOT_MASTER
4587c8b28152SLiu Gang		Board can support master function for Boot from SRIO and PCIE
4588c8b28152SLiu Gang
4589a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
4590a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
4591a09b9b68SKumar Gala
4592a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
4593a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
4594a09b9b68SKumar Gala
4595a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
4596a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
4597a09b9b68SKumar Gala
459866bd1846SFabio Estevam- CONFIG_SYS_NAND_BUSWIDTH_16BIT
459966bd1846SFabio Estevam		Defined to tell the NAND controller that the NAND chip is using
460066bd1846SFabio Estevam		a 16 bit bus.
460166bd1846SFabio Estevam		Not all NAND drivers use this symbol.
4602a430e916SFabio Estevam		Example of drivers that use it:
460366bd1846SFabio Estevam		- drivers/mtd/nand/ndfc.c
4604a430e916SFabio Estevam		- drivers/mtd/nand/mxc_nand.c
4605eced4626SAlex Waterman
4606eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
4607eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
4608eced4626SAlex Waterman		a default value will be used.
4609eced4626SAlex Waterman
4610bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
4611218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
4612218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
4613218ca724SWolfgang Denk
4614bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
4615bb99ad6dSBen Warren		I2C address of the SPD EEPROM
4616bb99ad6dSBen Warren
46176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
4618218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
4619218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
4620218ca724SWolfgang Denk		to something your driver can deal with.
4621bb99ad6dSBen Warren
46221b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
46231b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
46241b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
46251b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
46261b3e3c4fSYork Sun		header files or board specific files.
46271b3e3c4fSYork Sun
46286f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
46296f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
46306f5e1dc5SYork Sun
46316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
4632218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
4633218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
46342ad6b513STimur Tabi
4635c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
4636c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
4637c26e454dSwdenk
4638c26e454dSwdenk- CONFIG_FEC[12]_PHY
4639c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
46406e592385Swdenk		to the given FEC; i. e.
4641c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
4642c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
4643c26e454dSwdenk
4644c26e454dSwdenk		When set to -1, means to probe for first available.
4645c26e454dSwdenk
4646c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
4647c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
4648c26e454dSwdenk		(so program the FEC to ignore it).
4649c26e454dSwdenk
4650c26e454dSwdenk- CONFIG_RMII
4651c26e454dSwdenk		Enable RMII mode for all FECs.
4652c26e454dSwdenk		Note that this is a global option, we can't
4653c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
4654c26e454dSwdenk
46555cf91d6bSwdenk- CONFIG_CRC32_VERIFY
46565cf91d6bSwdenk		Add a verify option to the crc32 command.
46575cf91d6bSwdenk		The syntax is:
46585cf91d6bSwdenk
46595cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
46605cf91d6bSwdenk
46615cf91d6bSwdenk		Where address/count indicate a memory area
46625cf91d6bSwdenk		and crc32 is the correct crc32 which the
46635cf91d6bSwdenk		area should have.
46645cf91d6bSwdenk
466556523f12Swdenk- CONFIG_LOOPW
466656523f12Swdenk		Add the "loopw" memory command. This only takes effect if
4667602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
466856523f12Swdenk
46697b466641Sstroese- CONFIG_MX_CYCLIC
46707b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
46717b466641Sstroese		"md/mw" commands.
46727b466641Sstroese		Examples:
46737b466641Sstroese
46747b466641Sstroese		=> mdc.b 10 4 500
46757b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
46767b466641Sstroese
46777b466641Sstroese		=> mwc.l 100 12345678 10
46787b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
46797b466641Sstroese
46807b466641Sstroese		This only takes effect if the memory commands are activated
4681602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
46827b466641Sstroese
46838aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
4684afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
4685e03f3169SWolfgang Denk		low level initializations (like setting up the memory
4686e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
4687e03f3169SWolfgang Denk		relocate itself into RAM.
46888aa1a2d1Swdenk
4689e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
4690e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
4691e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
4692e03f3169SWolfgang Denk		these initializations itself.
46938aa1a2d1Swdenk
4694401bb30bSAneesh V- CONFIG_SPL_BUILD
4695df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
4696df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
4697df81238bSMagnus Lilja		compiling a NAND SPL.
4698400558b5Swdenk
46993aa29de0SYing Zhang- CONFIG_TPL_BUILD
47003aa29de0SYing Zhang		Modifies the behaviour of start.S  when compiling a loader
47013aa29de0SYing Zhang		that is executed after the SPL and before the actual U-Boot.
47023aa29de0SYing Zhang		It is loaded by the SPL.
47033aa29de0SYing Zhang
47045df572f0SYing Zhang- CONFIG_SYS_MPC85XX_NO_RESETVEC
47055df572f0SYing Zhang		Only for 85xx systems. If this variable is specified, the section
47065df572f0SYing Zhang		.resetvec is not kept and the section .bootpg is placed in the
47075df572f0SYing Zhang		previous 4k of the .text section.
47085df572f0SYing Zhang
47094213fc29SSimon Glass- CONFIG_ARCH_MAP_SYSMEM
47104213fc29SSimon Glass		Generally U-Boot (and in particular the md command) uses
47114213fc29SSimon Glass		effective address. It is therefore not necessary to regard
47124213fc29SSimon Glass		U-Boot address as virtual addresses that need to be translated
47134213fc29SSimon Glass		to physical addresses. However, sandbox requires this, since
47144213fc29SSimon Glass		it maintains its own little RAM buffer which contains all
47154213fc29SSimon Glass		addressable memory. This option causes some memory accesses
47164213fc29SSimon Glass		to be mapped through map_sysmem() / unmap_sysmem().
47174213fc29SSimon Glass
4718d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
4719d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
4720d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
4721d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
4722d8834a13SMatthias Weisser		conditions but may increase the binary size.
4723d8834a13SMatthias Weisser
4724588a13f7SSimon Glass- CONFIG_X86_RESET_VECTOR
4725588a13f7SSimon Glass		If defined, the x86 reset vector code is included. This is not
4726588a13f7SSimon Glass		needed when U-Boot is running from Coreboot.
4727b16f521aSGabe Black
4728fc33705eSMark Jackson- CONFIG_SYS_MPUCLK
4729fc33705eSMark Jackson		Defines the MPU clock speed (in MHz).
4730fc33705eSMark Jackson
4731fc33705eSMark Jackson		NOTE : currently only supported on AM335x platforms.
47325b5ece9eSGabe Black
473316678eb4SHeiko Schocher- CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC:
473416678eb4SHeiko Schocher		Enables the RTC32K OSC on AM33xx based plattforms
473516678eb4SHeiko Schocher
4736999d7d32SKaricheri, Muralidharan- CONFIG_SYS_NAND_NO_SUBPAGE_WRITE
4737999d7d32SKaricheri, Muralidharan		Option to disable subpage write in NAND driver
4738999d7d32SKaricheri, Muralidharan		driver that uses this:
4739999d7d32SKaricheri, Muralidharan		drivers/mtd/nand/davinci_nand.c
4740999d7d32SKaricheri, Muralidharan
4741f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
4742f2717b47STimur Tabi-----------------------------------
4743f2717b47STimur Tabi
4744f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4745f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
4746f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
4747f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
4748f2717b47STimur Tabiwithin that device.
4749f2717b47STimur Tabi
4750dcf1d774SZhao Qiang- CONFIG_SYS_FMAN_FW_ADDR
4751dcf1d774SZhao Qiang	The address in the storage device where the FMAN microcode is located.  The
4752dcf1d774SZhao Qiang	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4753dcf1d774SZhao Qiang	is also specified.
4754dcf1d774SZhao Qiang
4755dcf1d774SZhao Qiang- CONFIG_SYS_QE_FW_ADDR
4756dcf1d774SZhao Qiang	The address in the storage device where the QE microcode is located.  The
4757f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4758f2717b47STimur Tabi	is also specified.
4759f2717b47STimur Tabi
4760f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
4761f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
4762f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
4763f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
4764f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
4765f2717b47STimur Tabi
4766f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
4767f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4768f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
4769f2717b47STimur Tabi	virtual address in NOR flash.
4770f2717b47STimur Tabi
4771f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
4772f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
4773f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4774f2717b47STimur Tabi
4775f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
4776f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
4777f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4778f2717b47STimur Tabi
4779f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4780f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
4781f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4782f2717b47STimur Tabi
4783292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4784292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
4785292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4786fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4787fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
4788fc54c7faSLiu Gang	master's memory space.
4789f2717b47STimur Tabi
4790b940ca64SJ. German RiveraFreescale Layerscape Management Complex Firmware Support:
4791b940ca64SJ. German Rivera---------------------------------------------------------
4792b940ca64SJ. German RiveraThe Freescale Layerscape Management Complex (MC) supports the loading of
4793b940ca64SJ. German Rivera"firmware".
4794b940ca64SJ. German RiveraThis firmware often needs to be loaded during U-Boot booting, so macros
4795b940ca64SJ. German Riveraare used to identify the storage device (NOR flash, SPI, etc) and the address
4796b940ca64SJ. German Riverawithin that device.
4797b940ca64SJ. German Rivera
4798b940ca64SJ. German Rivera- CONFIG_FSL_MC_ENET
4799b940ca64SJ. German Rivera	Enable the MC driver for Layerscape SoCs.
4800b940ca64SJ. German Rivera
4801b940ca64SJ. German Rivera- CONFIG_SYS_LS_MC_FW_ADDR
4802b940ca64SJ. German Rivera	The address in the storage device where the firmware is located.  The
4803b940ca64SJ. German Rivera	meaning of this address depends on which CONFIG_SYS_LS_MC_FW_IN_xxx macro
4804b940ca64SJ. German Rivera	is also specified.
4805b940ca64SJ. German Rivera
4806b940ca64SJ. German Rivera- CONFIG_SYS_LS_MC_FW_LENGTH
4807b940ca64SJ. German Rivera	The maximum possible size of the firmware.  The firmware binary format
4808b940ca64SJ. German Rivera	has a field that specifies the actual size of the firmware, but it
4809b940ca64SJ. German Rivera	might not be possible to read any part of the firmware unless some
4810b940ca64SJ. German Rivera	local storage is allocated to hold the entire firmware first.
4811b940ca64SJ. German Rivera
4812b940ca64SJ. German Rivera- CONFIG_SYS_LS_MC_FW_IN_NOR
4813b940ca64SJ. German Rivera	Specifies that MC firmware is located in NOR flash, mapped as
4814b940ca64SJ. German Rivera	normal addressable memory via the LBC. CONFIG_SYS_LS_MC_FW_ADDR is the
4815b940ca64SJ. German Rivera	virtual address in NOR flash.
4816b940ca64SJ. German Rivera
4817c609719bSwdenkBuilding the Software:
4818c609719bSwdenk======================
4819c609719bSwdenk
4820218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
4821218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
4822218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
4823218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
4824218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4825218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
4826c609719bSwdenk
4827218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
4828218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
4829218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
4830218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
4831218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
4832c609719bSwdenk
4833218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
4834218ca724SWolfgang Denk	$ export CROSS_COMPILE
4835c609719bSwdenk
48362f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
48372f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
48382f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
48392f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
48402f8d396bSPeter Tyser
48412f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
48422f8d396bSPeter Tyser
48432f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
48442f8d396bSPeter Tyser      be executed on computers running Windows.
48452f8d396bSPeter Tyser
4846c609719bSwdenkU-Boot is intended to be simple to build. After installing the
4847c609719bSwdenksources you must configure U-Boot for one specific board type. This
4848c609719bSwdenkis done by typing:
4849c609719bSwdenk
4850*ab584d67SHolger Freyther	make NAME_defconfig
4851c609719bSwdenk
4852*ab584d67SHolger Freytherwhere "NAME_defconfig" is the name of one of the existing configu-
48534d675ae6SMichael Jonesrations; see boards.cfg for supported names.
485454387ac9Swdenk
4855c609719bSwdenkNote: for some board special configuration names may exist; check if
4856c609719bSwdenk      additional information is available from the board vendor; for
48572729af9dSwdenk      instance, the TQM823L systems are available without (standard)
48582729af9dSwdenk      or with LCD support. You can select such additional "features"
485911ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
4860c609719bSwdenk
4861*ab584d67SHolger Freyther      make TQM823L_defconfig
48622729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
4863c609719bSwdenk
4864*ab584d67SHolger Freyther      make TQM823L_LCD_defconfig
4865c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
4866c609719bSwdenk
4867c609719bSwdenk      etc.
4868c609719bSwdenk
4869c609719bSwdenk
4870c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
48717152b1d0Swdenkimages ready for download to / installation on your system:
4872c609719bSwdenk
4873c609719bSwdenk- "u-boot.bin" is a raw binary image
4874c609719bSwdenk- "u-boot" is an image in ELF binary format
4875c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
4876c609719bSwdenk
4877baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
4878baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
4879baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
4880baf31249SMarian Balakowicz
4881baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
4882baf31249SMarian Balakowicz
4883baf31249SMarian Balakowicz	make O=/tmp/build distclean
4884*ab584d67SHolger Freyther	make O=/tmp/build NAME_defconfig
4885baf31249SMarian Balakowicz	make O=/tmp/build all
4886baf31249SMarian Balakowicz
4887baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
4888baf31249SMarian Balakowicz
4889baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4890baf31249SMarian Balakowicz	make distclean
4891*ab584d67SHolger Freyther	make NAME_defconfig
4892baf31249SMarian Balakowicz	make all
4893baf31249SMarian Balakowicz
4894baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
4895baf31249SMarian Balakowiczvariable.
4896baf31249SMarian Balakowicz
4897c609719bSwdenk
4898c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
4899c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
4900c609719bSwdenknative "make".
4901c609719bSwdenk
4902c609719bSwdenk
4903c609719bSwdenkIf the system board that you have is not listed, then you will need
4904c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
4905c609719bSwdenksteps:
4906c609719bSwdenk
4907c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
49084d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
49094d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
4910c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
491185ec0bccSwdenk    files you need. In your board directory, you will need at least
491285ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
491385ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
491485ec0bccSwdenk    your board
4915c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
4916c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
4917*ab584d67SHolger Freyther4.  Run "make <board>_defconfig" with your new name.
4918c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
4919c609719bSwdenk    to be installed on your target system.
492085ec0bccSwdenk6.  Debug and solve any problems that might arise.
4921c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
4922c609719bSwdenk
4923c609719bSwdenk
4924c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
4925c609719bSwdenk==============================================================
4926c609719bSwdenk
4927c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
4928c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
4929c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
4930c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
4931218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
4932c609719bSwdenk
4933c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
4934c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
4935c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
4936c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
4937c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
49387152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
4939218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
4940218ca724SWolfgang Denkyou can type
4941c609719bSwdenk
4942c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
4943c609719bSwdenk
4944c609719bSwdenkor to build on a native PowerPC system you can type
4945c609719bSwdenk
4946c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
4947c609719bSwdenk
4948218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
4949218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
4950218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
4951218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
4952218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
4953218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
4954218ca724SWolfgang Denkvariable. For example:
4955baf31249SMarian Balakowicz
4956baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4957baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
4958baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
4959baf31249SMarian Balakowicz
4960218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
4961218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
4962218ca724SWolfgang Denkduring the whole build process.
4963baf31249SMarian Balakowicz
4964baf31249SMarian Balakowicz
4965c609719bSwdenkSee also "U-Boot Porting Guide" below.
4966c609719bSwdenk
4967c609719bSwdenk
4968c609719bSwdenkMonitor Commands - Overview:
4969c609719bSwdenk============================
4970c609719bSwdenk
4971c609719bSwdenkgo	- start application at address 'addr'
4972c609719bSwdenkrun	- run commands in an environment variable
4973c609719bSwdenkbootm	- boot application image from memory
4974c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
497544f074c7SMarek Vasutbootz   - boot zImage from memory
4976c609719bSwdenktftpboot- boot image via network using TFTP protocol
4977c609719bSwdenk	       and env variables "ipaddr" and "serverip"
4978c609719bSwdenk	       (and eventually "gatewayip")
49791fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
4980c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
4981c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
4982c609719bSwdenkloads	- load S-Record file over serial line
4983c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
4984c609719bSwdenkmd	- memory display
4985c609719bSwdenkmm	- memory modify (auto-incrementing)
4986c609719bSwdenknm	- memory modify (constant address)
4987c609719bSwdenkmw	- memory write (fill)
4988c609719bSwdenkcp	- memory copy
4989c609719bSwdenkcmp	- memory compare
4990c609719bSwdenkcrc32	- checksum calculation
49910f89c54bSPeter Tyseri2c	- I2C sub-system
4992c609719bSwdenksspi	- SPI utility commands
4993c609719bSwdenkbase	- print or set address offset
4994c609719bSwdenkprintenv- print environment variables
4995c609719bSwdenksetenv	- set environment variables
4996c609719bSwdenksaveenv - save environment variables to persistent storage
4997c609719bSwdenkprotect - enable or disable FLASH write protection
4998c609719bSwdenkerase	- erase FLASH memory
4999c609719bSwdenkflinfo	- print FLASH memory information
500010635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
5001c609719bSwdenkbdinfo	- print Board Info structure
5002c609719bSwdenkiminfo	- print header information for application image
5003c609719bSwdenkconinfo - print console devices and informations
5004c609719bSwdenkide	- IDE sub-system
5005c609719bSwdenkloop	- infinite loop on address range
500656523f12Swdenkloopw	- infinite write loop on address range
5007c609719bSwdenkmtest	- simple RAM test
5008c609719bSwdenkicache	- enable or disable instruction cache
5009c609719bSwdenkdcache	- enable or disable data cache
5010c609719bSwdenkreset	- Perform RESET of the CPU
5011c609719bSwdenkecho	- echo args to console
5012c609719bSwdenkversion - print monitor version
5013c609719bSwdenkhelp	- print online help
5014c609719bSwdenk?	- alias for 'help'
5015c609719bSwdenk
5016c609719bSwdenk
5017c609719bSwdenkMonitor Commands - Detailed Description:
5018c609719bSwdenk========================================
5019c609719bSwdenk
5020c609719bSwdenkTODO.
5021c609719bSwdenk
5022c609719bSwdenkFor now: just type "help <command>".
5023c609719bSwdenk
5024c609719bSwdenk
5025c609719bSwdenkEnvironment Variables:
5026c609719bSwdenk======================
5027c609719bSwdenk
5028c609719bSwdenkU-Boot supports user configuration using Environment Variables which
5029c609719bSwdenkcan be made persistent by saving to Flash memory.
5030c609719bSwdenk
5031c609719bSwdenkEnvironment Variables are set using "setenv", printed using
5032c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
5033c609719bSwdenkwithout a value can be used to delete a variable from the
5034c609719bSwdenkenvironment. As long as you don't save the environment you are
5035c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
5036c609719bSwdenkenvironment is erased by accident, a default environment is provided.
5037c609719bSwdenk
5038c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
5039c96f86eeSWolfgang Denk
5040c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
5041c609719bSwdenk
5042c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
5043c609719bSwdenk
5044c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
5045c609719bSwdenk
5046c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
5047c609719bSwdenk
5048c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
5049c609719bSwdenk
5050c609719bSwdenk  bootfile	- Name of the image to load with TFTP
5051c609719bSwdenk
50527d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
50537d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
50547d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
50557d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
50567d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
50577d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
5058c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
5059c3624e6eSGrant Likely		  bootm_mapsize.
5060c3624e6eSGrant Likely
5061c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
5062c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
5063c3624e6eSGrant Likely		  defines the size of the memory region starting at base
5064c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
5065c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
5066c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
5067c3624e6eSGrant Likely		  used otherwise.
50687d721e34SBartlomiej Sieka
50697d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
50707d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
50717d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
50727d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
50737d721e34SBartlomiej Sieka		  environment variable.
50747d721e34SBartlomiej Sieka
50754bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
50764bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
50774bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
50784bae9090SBartlomiej Sieka
5079c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
5080c609719bSwdenk		  "bootp" will just load perform a lookup of the
5081c609719bSwdenk		  configuration from the BOOTP server, but not try to
5082c609719bSwdenk		  load any image using TFTP
5083c609719bSwdenk
5084c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
5085c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
5086c609719bSwdenk		  be automatically started (by internally calling
5087c609719bSwdenk		  "bootm")
5088c609719bSwdenk
50894a6fd34bSwdenk		  If set to "no", a standalone image passed to the
50904a6fd34bSwdenk		  "bootm" command will be copied to the load address
50914a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
50924a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
50934a6fd34bSwdenk		  data.
50944a6fd34bSwdenk
5095a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
5096a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
5097fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
5098fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
5099fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
5100fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
5101fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
5102fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
5103fa34f6b2SShawn Guo		  access it during the boot procedure.
5104fa34f6b2SShawn Guo
5105a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
5106a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
5107a28afca5SDavid A. Long		  to work it must reside in writable memory, have
5108a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
5109a28afca5SDavid A. Long		  add the information it needs into it, and the memory
5110a28afca5SDavid A. Long		  must be accessible by the kernel.
5111a28afca5SDavid A. Long
5112eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
5113eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
5114eea63e05SSimon Glass		  defined.
5115eea63e05SSimon Glass
511617ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
511717ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
511817ea1177Swdenk		  mode (400kHZ). This environment variable is used in
511917ea1177Swdenk		  initialization code. So, for changes to be effective
512017ea1177Swdenk		  it must be saved and board must be reset.
512117ea1177Swdenk
5122c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
5123c609719bSwdenk		  If this variable is not set, initrd images will be
5124c609719bSwdenk		  copied to the highest possible address in RAM; this
5125c609719bSwdenk		  is usually what you want since it allows for
5126c609719bSwdenk		  maximum initrd size. If for some reason you want to
5127c609719bSwdenk		  make sure that the initrd image is loaded below the
51286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
5129c609719bSwdenk		  variable to a value of "no" or "off" or "0".
5130c609719bSwdenk		  Alternatively, you can set it to a maximum upper
5131c609719bSwdenk		  address to use (U-Boot will still check that it
5132c609719bSwdenk		  does not overwrite the U-Boot stack and data).
5133c609719bSwdenk
5134c609719bSwdenk		  For instance, when you have a system with 16 MB
51357152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
5136c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
5137c609719bSwdenk		  the "bootargs" variable. However, now you must make
51387152b1d0Swdenk		  sure that the initrd image is placed in the first
5139c609719bSwdenk		  12 MB as well - this can be done with
5140c609719bSwdenk
5141c609719bSwdenk		  setenv initrd_high 00c00000
5142c609719bSwdenk
514338b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
514438b99261Swdenk		  indication to U-Boot that all addresses are legal
514538b99261Swdenk		  for the Linux kernel, including addresses in flash
514638b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
514738b99261Swdenk		  ramdisk at all. This may be useful to reduce the
514838b99261Swdenk		  boot time on your system, but requires that this
514938b99261Swdenk		  feature is supported by your Linux kernel.
515038b99261Swdenk
5151c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
5152c609719bSwdenk
5153c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
5154dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
5155c609719bSwdenk
5156c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
5157c609719bSwdenk
5158c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
5159c609719bSwdenk
5160c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
5161c609719bSwdenk
5162c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
5163c609719bSwdenk
5164c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
5165c609719bSwdenk
5166e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
5167a3d991bdSwdenk
5168e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
5169e2a53458SMike Frysinger		  For example you can do the following
5170a3d991bdSwdenk
517148690d80SHeiko Schocher		  => setenv ethact FEC
517248690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
517348690d80SHeiko Schocher		  => setenv ethact SCC
517448690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
5175a3d991bdSwdenk
5176e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
5177e1692577SMatthias Fuchs		  available network interfaces.
5178e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
5179e1692577SMatthias Fuchs
5180a3d991bdSwdenk  netretry	- When set to "no" each network operation will
5181a3d991bdSwdenk		  either succeed or fail without retrying.
51826e592385Swdenk		  When set to "once" the network operation will
51836e592385Swdenk		  fail when all the available network interfaces
51846e592385Swdenk		  are tried once without success.
5185a3d991bdSwdenk		  Useful on scripts which control the retry operation
5186a3d991bdSwdenk		  themselves.
5187a3d991bdSwdenk
5188b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
5189a1cf027aSJean-Christophe PLAGNIOL-VILLARD
51908d51aacdSSimon Glass  silent_linux  - If set then linux will be told to boot silently, by
51918d51aacdSSimon Glass		  changing the console to be empty. If "yes" it will be
51928d51aacdSSimon Glass		  made silent. If "no" it will not be made silent. If
51938d51aacdSSimon Glass		  unset, then it will be made silent if the U-Boot console
51948d51aacdSSimon Glass		  is silent.
51958d51aacdSSimon Glass
519628cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
5197ecb0ccd9SWolfgang Denk		  UDP source port.
5198ecb0ccd9SWolfgang Denk
519928cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
520028cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
520128cb9375SWolfgang Denk
5202c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
5203c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
5204c96f86eeSWolfgang Denk
5205c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
5206c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
5207c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
5208c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
5209c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
5210c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
5211c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
5212c96f86eeSWolfgang Denk
5213a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
521411ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
5215a3d991bdSwdenk		  VLAN tagged frames.
5216c609719bSwdenk
5217dc0b7b0eSJason HobbsThe following image location variables contain the location of images
5218dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
5219dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
5220dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
5221dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
5222dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
5223dc0b7b0eSJason Hobbsflash or offset in NAND flash.
5224dc0b7b0eSJason Hobbs
5225dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
5226dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
5227dc0b7b0eSJason Hobbsboards use these variables for other purposes.
5228dc0b7b0eSJason Hobbs
5229dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
5230dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
5231dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
5232dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
5233dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
5234dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
5235dc0b7b0eSJason Hobbs
5236c609719bSwdenkThe following environment variables may be used and automatically
5237c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
5238c609719bSwdenkdepending the information provided by your boot server:
5239c609719bSwdenk
5240c609719bSwdenk  bootfile	- see above
5241c609719bSwdenk  dnsip		- IP address of your Domain Name Server
5242fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
5243c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
5244c609719bSwdenk  hostname	- Target hostname
5245c609719bSwdenk  ipaddr	- see above
5246c609719bSwdenk  netmask	- Subnet Mask
5247c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
5248c609719bSwdenk  serverip	- see above
5249c609719bSwdenk
5250c609719bSwdenk
5251c609719bSwdenkThere are two special Environment Variables:
5252c609719bSwdenk
5253c609719bSwdenk  serial#	- contains hardware identification information such
5254c609719bSwdenk		  as type string and/or serial number
5255c609719bSwdenk  ethaddr	- Ethernet address
5256c609719bSwdenk
5257c609719bSwdenkThese variables can be set only once (usually during manufacturing of
5258c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
5259c609719bSwdenkonce they have been set once.
5260c609719bSwdenk
5261c609719bSwdenk
5262c1551ea8SstroeseFurther special Environment Variables:
5263c1551ea8Sstroese
5264c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
5265c1551ea8Sstroese		  with the "version" command. This variable is
5266c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
5267c1551ea8Sstroese
5268c1551ea8Sstroese
5269c609719bSwdenkPlease note that changes to some configuration parameters may take
5270c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
5271c609719bSwdenk
5272c609719bSwdenk
5273170ab110SJoe HershbergerCallback functions for environment variables:
5274170ab110SJoe Hershberger---------------------------------------------
5275170ab110SJoe Hershberger
5276170ab110SJoe HershbergerFor some environment variables, the behavior of u-boot needs to change
5277170ab110SJoe Hershbergerwhen their values are changed.  This functionailty allows functions to
5278170ab110SJoe Hershbergerbe associated with arbitrary variables.  On creation, overwrite, or
5279170ab110SJoe Hershbergerdeletion, the callback will provide the opportunity for some side
5280170ab110SJoe Hershbergereffect to happen or for the change to be rejected.
5281170ab110SJoe Hershberger
5282170ab110SJoe HershbergerThe callbacks are named and associated with a function using the
5283170ab110SJoe HershbergerU_BOOT_ENV_CALLBACK macro in your board or driver code.
5284170ab110SJoe Hershberger
5285170ab110SJoe HershbergerThese callbacks are associated with variables in one of two ways.  The
5286170ab110SJoe Hershbergerstatic list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
5287170ab110SJoe Hershbergerin the board configuration to a string that defines a list of
5288170ab110SJoe Hershbergerassociations.  The list must be in the following format:
5289170ab110SJoe Hershberger
5290170ab110SJoe Hershberger	entry = variable_name[:callback_name]
5291170ab110SJoe Hershberger	list = entry[,list]
5292170ab110SJoe Hershberger
5293170ab110SJoe HershbergerIf the callback name is not specified, then the callback is deleted.
5294170ab110SJoe HershbergerSpaces are also allowed anywhere in the list.
5295170ab110SJoe Hershberger
5296170ab110SJoe HershbergerCallbacks can also be associated by defining the ".callbacks" variable
5297170ab110SJoe Hershbergerwith the same list format above.  Any association in ".callbacks" will
5298170ab110SJoe Hershbergeroverride any association in the static list. You can define
5299170ab110SJoe HershbergerCONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
5300170ab110SJoe Hershberger".callbacks" envirnoment variable in the default or embedded environment.
5301170ab110SJoe Hershberger
5302170ab110SJoe Hershberger
5303f07771ccSwdenkCommand Line Parsing:
5304f07771ccSwdenk=====================
5305f07771ccSwdenk
5306f07771ccSwdenkThere are two different command line parsers available with U-Boot:
53077152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
5308f07771ccSwdenk
5309f07771ccSwdenkOld, simple command line parser:
5310f07771ccSwdenk--------------------------------
5311f07771ccSwdenk
5312f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
5313f07771ccSwdenk- several commands on one line, separated by ';'
5314fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
5315f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
5316f07771ccSwdenk  for example:
5317fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
5318f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
5319f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
5320f07771ccSwdenk
5321f07771ccSwdenkHush shell:
5322f07771ccSwdenk-----------
5323f07771ccSwdenk
5324f07771ccSwdenk- similar to Bourne shell, with control structures like
5325f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
5326f07771ccSwdenk  until...do...done, ...
5327f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
5328f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
5329f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
5330f07771ccSwdenk  command
5331f07771ccSwdenk
5332f07771ccSwdenkGeneral rules:
5333f07771ccSwdenk--------------
5334f07771ccSwdenk
5335f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
5336f07771ccSwdenk    command) contains several commands separated by semicolon, and
5337f07771ccSwdenk    one of these commands fails, then the remaining commands will be
5338f07771ccSwdenk    executed anyway.
5339f07771ccSwdenk
5340f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
534111ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
5342f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
5343f07771ccSwdenk    variables are not executed.
5344f07771ccSwdenk
5345c609719bSwdenkNote for Redundant Ethernet Interfaces:
5346c609719bSwdenk=======================================
5347c609719bSwdenk
534811ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
5349c609719bSwdenksuch configurations and is capable of automatic selection of a
53507152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
5351c609719bSwdenk
5352c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
5353c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
5354c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
5355c609719bSwdenk
5356c609719bSwdenkIf the network interface stores some valid MAC address (for instance
5357c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
5358c609719bSwdenkding setting in the environment; if the corresponding environment
5359c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
5360c609719bSwdenk
5361c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
5362c609719bSwdenk  environment, the SROM's address is used.
5363c609719bSwdenk
5364c609719bSwdenko If there is no valid address in the SROM, and a definition in the
5365c609719bSwdenk  environment exists, then the value from the environment variable is
5366c609719bSwdenk  used.
5367c609719bSwdenk
5368c609719bSwdenko If both the SROM and the environment contain a MAC address, and
5369c609719bSwdenk  both addresses are the same, this MAC address is used.
5370c609719bSwdenk
5371c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
5372c609719bSwdenk  addresses differ, the value from the environment is used and a
5373c609719bSwdenk  warning is printed.
5374c609719bSwdenk
5375c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
5376c609719bSwdenk  is raised.
5377c609719bSwdenk
5378ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
5379ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
5380ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
5381ecee9324SBen WarrenThe naming convention is as follows:
5382ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
5383c609719bSwdenk
5384c609719bSwdenkImage Formats:
5385c609719bSwdenk==============
5386c609719bSwdenk
53873310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
53883310c549SMarian Balakowiczimages in two formats:
53893310c549SMarian Balakowicz
53903310c549SMarian BalakowiczNew uImage format (FIT)
53913310c549SMarian Balakowicz-----------------------
53923310c549SMarian Balakowicz
53933310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
53943310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
53953310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
53963310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
53973310c549SMarian Balakowicz
53983310c549SMarian Balakowicz
53993310c549SMarian BalakowiczOld uImage format
54003310c549SMarian Balakowicz-----------------
54013310c549SMarian Balakowicz
54023310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
54033310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
54043310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
5405c609719bSwdenk
5406c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
5407c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
5408f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
5409f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
5410f5ed9e39SPeter Tyser  INTEGRITY).
54117b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
5412afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
5413afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
5414c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
5415c609719bSwdenk* Load Address
5416c609719bSwdenk* Entry Point
5417c609719bSwdenk* Image Name
5418c609719bSwdenk* Image Timestamp
5419c609719bSwdenk
5420c609719bSwdenkThe header is marked by a special Magic Number, and both the header
5421c609719bSwdenkand the data portions of the image are secured against corruption by
5422c609719bSwdenkCRC32 checksums.
5423c609719bSwdenk
5424c609719bSwdenk
5425c609719bSwdenkLinux Support:
5426c609719bSwdenk==============
5427c609719bSwdenk
5428c609719bSwdenkAlthough U-Boot should support any OS or standalone application
54297152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
5430c609719bSwdenkU-Boot.
5431c609719bSwdenk
5432c609719bSwdenkU-Boot includes many features that so far have been part of some
5433c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
5434c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
5435c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
54367152b1d0Swdenkserves several purposes:
5437c609719bSwdenk
5438c609719bSwdenk- the same features can be used for other OS or standalone
5439c609719bSwdenk  applications (for instance: using compressed images to reduce the
5440c609719bSwdenk  Flash memory footprint)
5441c609719bSwdenk
5442c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
54437152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
5444c609719bSwdenk
5445c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
5446c609719bSwdenk  images; of course this also means that different kernel images can
5447c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
5448c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
5449c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
5450c609719bSwdenk  software is easier now.
5451c609719bSwdenk
5452c609719bSwdenk
5453c609719bSwdenkLinux HOWTO:
5454c609719bSwdenk============
5455c609719bSwdenk
5456c609719bSwdenkPorting Linux to U-Boot based systems:
5457c609719bSwdenk---------------------------------------
5458c609719bSwdenk
5459c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
5460c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
5461c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
5462c609719bSwdenkLinux :-).
5463c609719bSwdenk
5464a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
5465c609719bSwdenk
5466c609719bSwdenkJust make sure your machine specific header file (for instance
5467c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
54681dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
54691dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
54706d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
5471c609719bSwdenk
54722eb31b13SSimon GlassNote that U-Boot now has a driver model, a unified model for drivers.
54732eb31b13SSimon GlassIf you are adding a new driver, plumb it into driver model. If there
54742eb31b13SSimon Glassis no uclass available, you are encouraged to create one. See
54752eb31b13SSimon Glassdoc/driver-model.
54762eb31b13SSimon Glass
5477c609719bSwdenk
5478c609719bSwdenkConfiguring the Linux kernel:
5479c609719bSwdenk-----------------------------
5480c609719bSwdenk
5481c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
5482c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
5483c609719bSwdenk
5484c609719bSwdenk
5485c609719bSwdenkBuilding a Linux Image:
5486c609719bSwdenk-----------------------
5487c609719bSwdenk
548824ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
548924ee89b9Swdenknot used. If you use recent kernel source, a new build target
549024ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
549124ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
549224ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
549324ee89b9Swdenk100% compatible format.
5494c609719bSwdenk
5495c609719bSwdenkExample:
5496c609719bSwdenk
5497*ab584d67SHolger Freyther	make TQM850L_defconfig
5498c609719bSwdenk	make oldconfig
5499c609719bSwdenk	make dep
550024ee89b9Swdenk	make uImage
5501c609719bSwdenk
550224ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
550324ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
550424ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
5505c609719bSwdenk
550624ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
550724ee89b9Swdenk
550824ee89b9Swdenk* convert the kernel into a raw binary image:
550924ee89b9Swdenk
551024ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
551124ee89b9Swdenk				 -R .note -R .comment \
551224ee89b9Swdenk				 -S vmlinux linux.bin
551324ee89b9Swdenk
551424ee89b9Swdenk* compress the binary image:
551524ee89b9Swdenk
551624ee89b9Swdenk	gzip -9 linux.bin
551724ee89b9Swdenk
551824ee89b9Swdenk* package compressed binary image for U-Boot:
551924ee89b9Swdenk
552024ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
552124ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
552224ee89b9Swdenk		-d linux.bin.gz uImage
552324ee89b9Swdenk
552424ee89b9Swdenk
552524ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
552624ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
552724ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
552824ee89b9Swdenkbyte header containing information about target architecture,
552924ee89b9Swdenkoperating system, image type, compression method, entry points, time
553024ee89b9Swdenkstamp, CRC32 checksums, etc.
553124ee89b9Swdenk
553224ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
553324ee89b9Swdenkprint the header information, or to build new images.
5534c609719bSwdenk
5535c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
5536c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
5537c609719bSwdenkchecksum verification:
5538c609719bSwdenk
5539c609719bSwdenk	tools/mkimage -l image
5540c609719bSwdenk	  -l ==> list image header information
5541c609719bSwdenk
5542c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
5543c609719bSwdenkfrom a "data file" which is used as image payload:
5544c609719bSwdenk
5545c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
5546c609719bSwdenk		      -n name -d data_file image
5547c609719bSwdenk	  -A ==> set architecture to 'arch'
5548c609719bSwdenk	  -O ==> set operating system to 'os'
5549c609719bSwdenk	  -T ==> set image type to 'type'
5550c609719bSwdenk	  -C ==> set compression type 'comp'
5551c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
5552c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
5553c609719bSwdenk	  -n ==> set image name to 'name'
5554c609719bSwdenk	  -d ==> use image data from 'datafile'
5555c609719bSwdenk
555669459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
555769459791Swdenkaddress (0x00000000), but the entry point address depends on the
555869459791Swdenkkernel version:
5559c609719bSwdenk
5560c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
556124ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
5562c609719bSwdenk
5563c609719bSwdenkSo a typical call to build a U-Boot image would read:
5564c609719bSwdenk
556524ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
556624ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
5567a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
556824ee89b9Swdenk	> examples/uImage.TQM850L
556924ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5570c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5571c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5572c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5573c609719bSwdenk	Load Address: 0x00000000
557424ee89b9Swdenk	Entry Point:  0x00000000
5575c609719bSwdenk
5576c609719bSwdenkTo verify the contents of the image (or check for corruption):
5577c609719bSwdenk
557824ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
557924ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5580c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5581c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5582c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5583c609719bSwdenk	Load Address: 0x00000000
558424ee89b9Swdenk	Entry Point:  0x00000000
5585c609719bSwdenk
5586c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
5587c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
5588c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
5589c609719bSwdenkneed to be uncompressed:
5590c609719bSwdenk
5591a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
559224ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
559324ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
5594a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
559524ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
559624ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5597c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5598c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
5599c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
5600c609719bSwdenk	Load Address: 0x00000000
560124ee89b9Swdenk	Entry Point:  0x00000000
5602c609719bSwdenk
5603c609719bSwdenk
5604c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
5605c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
5606c609719bSwdenk
5607c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
5608c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
5609c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
5610c609719bSwdenk	Image Name:   Simple Ramdisk Image
5611c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
5612c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
5613c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
5614c609719bSwdenk	Load Address: 0x00000000
5615c609719bSwdenk	Entry Point:  0x00000000
5616c609719bSwdenk
5617a804b5ceSGuilherme Maciel FerreiraThe "dumpimage" is a tool to disassemble images built by mkimage. Its "-i"
5618a804b5ceSGuilherme Maciel Ferreiraoption performs the converse operation of the mkimage's second form (the "-d"
5619a804b5ceSGuilherme Maciel Ferreiraoption). Given an image built by mkimage, the dumpimage extracts a "data file"
5620a804b5ceSGuilherme Maciel Ferreirafrom the image:
5621a804b5ceSGuilherme Maciel Ferreira
5622a804b5ceSGuilherme Maciel Ferreira	tools/dumpimage -i image -p position data_file
5623a804b5ceSGuilherme Maciel Ferreira	  -i ==> extract from the 'image' a specific 'data_file', \
5624a804b5ceSGuilherme Maciel Ferreira	   indexed by 'position'
5625a804b5ceSGuilherme Maciel Ferreira
5626c609719bSwdenk
5627c609719bSwdenkInstalling a Linux Image:
5628c609719bSwdenk-------------------------
5629c609719bSwdenk
5630c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
5631c609719bSwdenkyou must convert the image to S-Record format:
5632c609719bSwdenk
5633c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
5634c609719bSwdenk
5635c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
5636c609719bSwdenkimage header, so the resulting S-Record file will be relative to
5637c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
5638c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
5639c609719bSwdenkcommand.
5640c609719bSwdenk
5641c609719bSwdenkExample: install the image to address 0x40100000 (which on the
5642c609719bSwdenkTQM8xxL is in the first Flash bank):
5643c609719bSwdenk
5644c609719bSwdenk	=> erase 40100000 401FFFFF
5645c609719bSwdenk
5646c609719bSwdenk	.......... done
5647c609719bSwdenk	Erased 8 sectors
5648c609719bSwdenk
5649c609719bSwdenk	=> loads 40100000
5650c609719bSwdenk	## Ready for S-Record download ...
5651c609719bSwdenk	~>examples/image.srec
5652c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5653c609719bSwdenk	...
5654c609719bSwdenk	15989 15990 15991 15992
5655c609719bSwdenk	[file transfer complete]
5656c609719bSwdenk	[connected]
5657c609719bSwdenk	## Start Addr = 0x00000000
5658c609719bSwdenk
5659c609719bSwdenk
5660c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
5661c609719bSwdenkthis includes a checksum verification so you can be sure no data
5662c609719bSwdenkcorruption happened:
5663c609719bSwdenk
5664c609719bSwdenk	=> imi 40100000
5665c609719bSwdenk
5666c609719bSwdenk	## Checking Image at 40100000 ...
5667c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5668c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5669c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5670c609719bSwdenk	   Load Address: 00000000
5671c609719bSwdenk	   Entry Point:	 0000000c
5672c609719bSwdenk	   Verifying Checksum ... OK
5673c609719bSwdenk
5674c609719bSwdenk
5675c609719bSwdenkBoot Linux:
5676c609719bSwdenk-----------
5677c609719bSwdenk
5678c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
5679c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
5680c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
5681c609719bSwdenkparameters. You can check and modify this variable using the
5682c609719bSwdenk"printenv" and "setenv" commands:
5683c609719bSwdenk
5684c609719bSwdenk
5685c609719bSwdenk	=> printenv bootargs
5686c609719bSwdenk	bootargs=root=/dev/ram
5687c609719bSwdenk
5688c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5689c609719bSwdenk
5690c609719bSwdenk	=> printenv bootargs
5691c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5692c609719bSwdenk
5693c609719bSwdenk	=> bootm 40020000
5694c609719bSwdenk	## Booting Linux kernel at 40020000 ...
5695c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
5696c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5697c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
5698c609719bSwdenk	   Load Address: 00000000
5699c609719bSwdenk	   Entry Point:	 0000000c
5700c609719bSwdenk	   Verifying Checksum ... OK
5701c609719bSwdenk	   Uncompressing Kernel Image ... OK
5702c609719bSwdenk	Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
5703c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5704c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5705c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5706c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5707c609719bSwdenk	...
5708c609719bSwdenk
570911ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
57107152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
5711c609719bSwdenkformat!) to the "bootm" command:
5712c609719bSwdenk
5713c609719bSwdenk	=> imi 40100000 40200000
5714c609719bSwdenk
5715c609719bSwdenk	## Checking Image at 40100000 ...
5716c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5717c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5718c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5719c609719bSwdenk	   Load Address: 00000000
5720c609719bSwdenk	   Entry Point:	 0000000c
5721c609719bSwdenk	   Verifying Checksum ... OK
5722c609719bSwdenk
5723c609719bSwdenk	## Checking Image at 40200000 ...
5724c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5725c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5726c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5727c609719bSwdenk	   Load Address: 00000000
5728c609719bSwdenk	   Entry Point:	 00000000
5729c609719bSwdenk	   Verifying Checksum ... OK
5730c609719bSwdenk
5731c609719bSwdenk	=> bootm 40100000 40200000
5732c609719bSwdenk	## Booting Linux kernel at 40100000 ...
5733c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5734c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5735c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5736c609719bSwdenk	   Load Address: 00000000
5737c609719bSwdenk	   Entry Point:	 0000000c
5738c609719bSwdenk	   Verifying Checksum ... OK
5739c609719bSwdenk	   Uncompressing Kernel Image ... OK
5740c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
5741c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5742c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5743c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5744c609719bSwdenk	   Load Address: 00000000
5745c609719bSwdenk	   Entry Point:	 00000000
5746c609719bSwdenk	   Verifying Checksum ... OK
5747c609719bSwdenk	   Loading Ramdisk ... OK
5748c609719bSwdenk	Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
5749c609719bSwdenk	Boot arguments: root=/dev/ram
5750c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5751c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5752c609719bSwdenk	...
5753c609719bSwdenk	RAMDISK: Compressed image found at block 0
5754c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
5755c609719bSwdenk
5756c609719bSwdenk	bash#
5757c609719bSwdenk
57580267768eSMatthew McClintockBoot Linux and pass a flat device tree:
57590267768eSMatthew McClintock-----------
57600267768eSMatthew McClintock
57610267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
57620267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
57630267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
57640267768eSMatthew McClintockflat device tree:
57650267768eSMatthew McClintock
57660267768eSMatthew McClintock=> print oftaddr
57670267768eSMatthew McClintockoftaddr=0x300000
57680267768eSMatthew McClintock=> print oft
57690267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
57700267768eSMatthew McClintock=> tftp $oftaddr $oft
57710267768eSMatthew McClintockSpeed: 1000, full duplex
57720267768eSMatthew McClintockUsing TSEC0 device
57730267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
57740267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
57750267768eSMatthew McClintockLoad address: 0x300000
57760267768eSMatthew McClintockLoading: #
57770267768eSMatthew McClintockdone
57780267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
57790267768eSMatthew McClintock=> tftp $loadaddr $bootfile
57800267768eSMatthew McClintockSpeed: 1000, full duplex
57810267768eSMatthew McClintockUsing TSEC0 device
57820267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
57830267768eSMatthew McClintockFilename 'uImage'.
57840267768eSMatthew McClintockLoad address: 0x200000
57850267768eSMatthew McClintockLoading:############
57860267768eSMatthew McClintockdone
57870267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
57880267768eSMatthew McClintock=> print loadaddr
57890267768eSMatthew McClintockloadaddr=200000
57900267768eSMatthew McClintock=> print oftaddr
57910267768eSMatthew McClintockoftaddr=0x300000
57920267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
57930267768eSMatthew McClintock## Booting image at 00200000 ...
57940267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
57950267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
57960267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
57970267768eSMatthew McClintock   Load Address: 00000000
57980267768eSMatthew McClintock   Entry Point:	 00000000
57990267768eSMatthew McClintock   Verifying Checksum ... OK
58000267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
58010267768eSMatthew McClintockBooting using flat device tree at 0x300000
58020267768eSMatthew McClintockUsing MPC85xx ADS machine description
58030267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
58040267768eSMatthew McClintock[snip]
58050267768eSMatthew McClintock
58060267768eSMatthew McClintock
58076069ff26SwdenkMore About U-Boot Image Types:
58086069ff26Swdenk------------------------------
58096069ff26Swdenk
58106069ff26SwdenkU-Boot supports the following image types:
58116069ff26Swdenk
58126069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
58136069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
58146069ff26Swdenk	well) you can continue to work in U-Boot after return from
58156069ff26Swdenk	the Standalone Program.
58166069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
58176069ff26Swdenk	will take over control completely. Usually these programs
58186069ff26Swdenk	will install their own set of exception handlers, device
58196069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
58206069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
58216069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
58226069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
58236069ff26Swdenk	being started.
58246069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
58256069ff26Swdenk	(Linux) kernel image and one or more data images like
58266069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
58276069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
58286069ff26Swdenk	server provides just a single image file, but you want to get
58296069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
58306069ff26Swdenk
58316069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
58326069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
58336069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
58346069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
58356069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
58366069ff26Swdenk	a multiple of 4 bytes).
58376069ff26Swdenk
58386069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
58396069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
58406069ff26Swdenk	flash memory.
58416069ff26Swdenk
58426069ff26Swdenk   "Script files" are command sequences that will be executed by
58436069ff26Swdenk	U-Boot's command interpreter; this feature is especially
58446069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
58456069ff26Swdenk	as command interpreter.
58466069ff26Swdenk
584744f074c7SMarek VasutBooting the Linux zImage:
584844f074c7SMarek Vasut-------------------------
584944f074c7SMarek Vasut
585044f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
585144f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
585244f074c7SMarek Vasutas the syntax of "bootm" command.
585344f074c7SMarek Vasut
58548ac28563STom RiniNote, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
5855017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
5856017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
5857017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
5858017e1f3fSMarek Vasut
5859c609719bSwdenk
5860c609719bSwdenkStandalone HOWTO:
5861c609719bSwdenk=================
5862c609719bSwdenk
5863c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
5864c609719bSwdenkrun "standalone" applications, which can use some resources of
5865c609719bSwdenkU-Boot like console I/O functions or interrupt services.
5866c609719bSwdenk
5867c609719bSwdenkTwo simple examples are included with the sources:
5868c609719bSwdenk
5869c609719bSwdenk"Hello World" Demo:
5870c609719bSwdenk-------------------
5871c609719bSwdenk
5872c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
5873c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
5874c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
5875c609719bSwdenklike that:
5876c609719bSwdenk
5877c609719bSwdenk	=> loads
5878c609719bSwdenk	## Ready for S-Record download ...
5879c609719bSwdenk	~>examples/hello_world.srec
5880c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5881c609719bSwdenk	[file transfer complete]
5882c609719bSwdenk	[connected]
5883c609719bSwdenk	## Start Addr = 0x00040004
5884c609719bSwdenk
5885c609719bSwdenk	=> go 40004 Hello World! This is a test.
5886c609719bSwdenk	## Starting application at 0x00040004 ...
5887c609719bSwdenk	Hello World
5888c609719bSwdenk	argc = 7
5889c609719bSwdenk	argv[0] = "40004"
5890c609719bSwdenk	argv[1] = "Hello"
5891c609719bSwdenk	argv[2] = "World!"
5892c609719bSwdenk	argv[3] = "This"
5893c609719bSwdenk	argv[4] = "is"
5894c609719bSwdenk	argv[5] = "a"
5895c609719bSwdenk	argv[6] = "test."
5896c609719bSwdenk	argv[7] = "<NULL>"
5897c609719bSwdenk	Hit any key to exit ...
5898c609719bSwdenk
5899c609719bSwdenk	## Application terminated, rc = 0x0
5900c609719bSwdenk
5901c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
5902c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
5903c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
5904c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
5905c609719bSwdenkcharacter, but this is just a demo program. The application can be
5906c609719bSwdenkcontrolled by the following keys:
5907c609719bSwdenk
5908c609719bSwdenk	? - print current values og the CPM Timer registers
5909c609719bSwdenk	b - enable interrupts and start timer
5910c609719bSwdenk	e - stop timer and disable interrupts
5911c609719bSwdenk	q - quit application
5912c609719bSwdenk
5913c609719bSwdenk	=> loads
5914c609719bSwdenk	## Ready for S-Record download ...
5915c609719bSwdenk	~>examples/timer.srec
5916c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5917c609719bSwdenk	[file transfer complete]
5918c609719bSwdenk	[connected]
5919c609719bSwdenk	## Start Addr = 0x00040004
5920c609719bSwdenk
5921c609719bSwdenk	=> go 40004
5922c609719bSwdenk	## Starting application at 0x00040004 ...
5923c609719bSwdenk	TIMERS=0xfff00980
5924c609719bSwdenk	Using timer 1
5925c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5926c609719bSwdenk
5927c609719bSwdenkHit 'b':
5928c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
5929c609719bSwdenk	Enabling timer
5930c609719bSwdenkHit '?':
5931c609719bSwdenk	[q, b, e, ?] ........
5932c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5933c609719bSwdenkHit '?':
5934c609719bSwdenk	[q, b, e, ?] .
5935c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5936c609719bSwdenkHit '?':
5937c609719bSwdenk	[q, b, e, ?] .
5938c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5939c609719bSwdenkHit '?':
5940c609719bSwdenk	[q, b, e, ?] .
5941c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5942c609719bSwdenkHit 'e':
5943c609719bSwdenk	[q, b, e, ?] ...Stopping timer
5944c609719bSwdenkHit 'q':
5945c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
5946c609719bSwdenk
5947c609719bSwdenk
594885ec0bccSwdenkMinicom warning:
594985ec0bccSwdenk================
595085ec0bccSwdenk
59517152b1d0SwdenkOver time, many people have reported problems when trying to use the
595285ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
595385ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
5954f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
595585ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
5956e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
5957e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5958e53515a2SKarl O. Pincfor help with kermit.
5959e53515a2SKarl O. Pinc
596085ec0bccSwdenk
596152f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
596252f52c14Swdenkconfiguration to your "File transfer protocols" section:
596352f52c14Swdenk
596452f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
596552f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
596652f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
596752f52c14Swdenk
596852f52c14Swdenk
5969c609719bSwdenkNetBSD Notes:
5970c609719bSwdenk=============
5971c609719bSwdenk
5972c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
5973c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
5974c609719bSwdenk
5975c609719bSwdenkBuilding requires a cross environment; it is known to work on
5976c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5977c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
5978c609719bSwdenkNote that the cross-powerpc package does not install include files;
5979c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
5980c609719bSwdenkmissing.  This file has to be installed and patched manually:
5981c609719bSwdenk
5982c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
5983c609719bSwdenk	# mkdir powerpc
5984c609719bSwdenk	# ln -s powerpc machine
5985c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5986c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
5987c609719bSwdenk
5988c609719bSwdenkNative builds *don't* work due to incompatibilities between native
5989c609719bSwdenkand U-Boot include files.
5990c609719bSwdenk
5991c609719bSwdenkBooting assumes that (the first part of) the image booted is a
5992c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
5993c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
5994c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
59952a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5996c609719bSwdenk
5997c609719bSwdenk
5998c609719bSwdenkImplementation Internals:
5999c609719bSwdenk=========================
6000c609719bSwdenk
6001c609719bSwdenkThe following is not intended to be a complete description of every
6002c609719bSwdenkimplementation detail. However, it should help to understand the
6003c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
6004c609719bSwdenkhardware.
6005c609719bSwdenk
6006c609719bSwdenk
6007c609719bSwdenkInitial Stack, Global Data:
6008c609719bSwdenk---------------------------
6009c609719bSwdenk
6010c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
6011c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
6012c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
6013c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
6014c609719bSwdenkis not initialized as zero. To be able to get a C environment working
6015c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
6016c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
6017c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
6018c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
6019c609719bSwdenklocked as (mis-) used as memory, etc.
6020c609719bSwdenk
60217152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
60220668236bSWolfgang Denk	U-Boot mailing list:
602343d9616cSwdenk
602443d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
602543d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
602643d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
602743d9616cSwdenk	...
602843d9616cSwdenk
602943d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
603043d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
603143d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
603243d9616cSwdenk	is that the cache is being used as a temporary supply of
603343d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
603411ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
603543d9616cSwdenk	can see how this works by studying the cache architecture and
603643d9616cSwdenk	operation in the architecture and processor-specific manuals.
603743d9616cSwdenk
603843d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
603943d9616cSwdenk	is another option for the system designer to use as an
604011ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
604143d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
604243d9616cSwdenk	board designers haven't used it for something that would
604343d9616cSwdenk	cause you grief during the initial boot! It is frequently not
604443d9616cSwdenk	used.
604543d9616cSwdenk
60466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
604743d9616cSwdenk	with your processor/board/system design. The default value
604843d9616cSwdenk	you will find in any recent u-boot distribution in
60498a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
605043d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
605143d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
605243d9616cSwdenk	that are supposed to respond to that address! That code in
605343d9616cSwdenk	start.S has been around a while and should work as is when
605443d9616cSwdenk	you get the config right.
605543d9616cSwdenk
605643d9616cSwdenk	-Chris Hallinan
605743d9616cSwdenk	DS4.COM, Inc.
605843d9616cSwdenk
6059c609719bSwdenkIt is essential to remember this, since it has some impact on the C
6060c609719bSwdenkcode for the initialization procedures:
6061c609719bSwdenk
6062c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
6063c609719bSwdenk  to write it.
6064c609719bSwdenk
606511ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
6066c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
60677152b1d0Swdenk  zation is performed later (when relocating to RAM).
6068c609719bSwdenk
6069c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
6070c609719bSwdenk  that.
6071c609719bSwdenk
6072c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
6073c609719bSwdenknormal global data to share information beween the code. But it
6074c609719bSwdenkturned out that the implementation of U-Boot can be greatly
6075c609719bSwdenksimplified by making a global data structure (gd_t) available to all
6076c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
6077c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
6078c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
6079c609719bSwdenkplace a pointer (gd) to the global data into a register which we
6080c609719bSwdenkreserve for this purpose.
6081c609719bSwdenk
60827152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
6083c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
6084c609719bSwdenkGCC's implementation.
6085c609719bSwdenk
6086c609719bSwdenkFor PowerPC, the following registers have specific use:
6087c609719bSwdenk	R1:	stack pointer
6088e7670f6cSWolfgang Denk	R2:	reserved for system use
6089c609719bSwdenk	R3-R4:	parameter passing and return values
6090c609719bSwdenk	R5-R10: parameter passing
6091c609719bSwdenk	R13:	small data area pointer
6092c609719bSwdenk	R30:	GOT pointer
6093c609719bSwdenk	R31:	frame pointer
6094c609719bSwdenk
6095e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
6096e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
6097e6bee808SJoakim Tjernlund	going back and forth between asm and C)
6098c609719bSwdenk
6099e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
6100c609719bSwdenk
6101c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
6102c609719bSwdenk    address of the global data structure is known at compile time),
6103c609719bSwdenk    but it turned out that reserving a register results in somewhat
6104c609719bSwdenk    smaller code - although the code savings are not that big (on
6105c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
6106c609719bSwdenk    624 text + 127 data).
6107c609719bSwdenk
6108c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
61094c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
61104c58eb55SMike Frysinger
6111c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
61124c58eb55SMike Frysinger
6113c609719bSwdenkOn ARM, the following registers are used:
6114c609719bSwdenk
6115c609719bSwdenk	R0:	function argument word/integer result
6116c609719bSwdenk	R1-R3:	function argument word
611712eba1b4SJeroen Hofstee	R9:	platform specific
611812eba1b4SJeroen Hofstee	R10:	stack limit (used only if stack checking is enabled)
6119c609719bSwdenk	R11:	argument (frame) pointer
6120c609719bSwdenk	R12:	temporary workspace
6121c609719bSwdenk	R13:	stack pointer
6122c609719bSwdenk	R14:	link register
6123c609719bSwdenk	R15:	program counter
6124c609719bSwdenk
612512eba1b4SJeroen Hofstee    ==> U-Boot will use R9 to hold a pointer to the global data
612612eba1b4SJeroen Hofstee
612712eba1b4SJeroen Hofstee    Note: on ARM, only R_ARM_RELATIVE relocations are supported.
6128c609719bSwdenk
61290df01fd3SThomas ChouOn Nios II, the ABI is documented here:
61300df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
61310df01fd3SThomas Chou
61320df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
61330df01fd3SThomas Chou
61340df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
61350df01fd3SThomas Chou    to access small data sections, so gp is free.
61360df01fd3SThomas Chou
6137afc1ce82SMacpaul LinOn NDS32, the following registers are used:
6138afc1ce82SMacpaul Lin
6139afc1ce82SMacpaul Lin	R0-R1:	argument/return
6140afc1ce82SMacpaul Lin	R2-R5:	argument
6141afc1ce82SMacpaul Lin	R15:	temporary register for assembler
6142afc1ce82SMacpaul Lin	R16:	trampoline register
6143afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
6144afc1ce82SMacpaul Lin	R29:	global pointer (GP)
6145afc1ce82SMacpaul Lin	R30:	link register (LP)
6146afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
6147afc1ce82SMacpaul Lin	PC:	program counter (PC)
6148afc1ce82SMacpaul Lin
6149afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
6150afc1ce82SMacpaul Lin
6151d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
6152d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
6153c609719bSwdenk
6154c609719bSwdenkMemory Management:
6155c609719bSwdenk------------------
6156c609719bSwdenk
6157c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
6158c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
6159c609719bSwdenk
6160c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
6161c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
6162c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
6163c609719bSwdenkphysical memory banks.
6164c609719bSwdenk
6165c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
6166c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
6167c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
6168c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
61696d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
6170c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
6171c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
6172c609719bSwdenk
6173c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
6174c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
6175c609719bSwdenk
6176c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
6177c609719bSwdenkthis:
6178c609719bSwdenk
6179c609719bSwdenk	0x0000 0000	Exception Vector code
6180c609719bSwdenk	      :
6181c609719bSwdenk	0x0000 1FFF
6182c609719bSwdenk	0x0000 2000	Free for Application Use
6183c609719bSwdenk	      :
6184c609719bSwdenk	      :
6185c609719bSwdenk
6186c609719bSwdenk	      :
6187c609719bSwdenk	      :
6188c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
6189c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
6190c609719bSwdenk	0x00FC 0000	Malloc Arena
6191c609719bSwdenk	      :
6192c609719bSwdenk	0x00FD FFFF
6193c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
6194c609719bSwdenk	...		eventually: LCD or video framebuffer
6195c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
6196c609719bSwdenk	0x00FF FFFF	[End of RAM]
6197c609719bSwdenk
6198c609719bSwdenk
6199c609719bSwdenkSystem Initialization:
6200c609719bSwdenk----------------------
6201c609719bSwdenk
6202c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
620311ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
6204c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
62057152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
6206c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
6207c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
6208c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
6209c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
6210c609719bSwdenkthe caches and the SIU.
6211c609719bSwdenk
6212c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
6213c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
6214c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
6215c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
6216c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
6217c609719bSwdenksimple memory test is run that determines the size of the SDRAM
6218c609719bSwdenkbanks.
6219c609719bSwdenk
6220c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
62217152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
6222c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
6223c609719bSwdenk0x00000000, with any additional banks following immediately to create
6224c609719bSwdenkcontiguous memory starting from 0.
6225c609719bSwdenk
6226c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
6227c609719bSwdenkand allocates memory for use by malloc() and for the global Board
6228c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
6229c609719bSwdenkpages, and the final stack is set up.
6230c609719bSwdenk
6231c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
6232c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
6233c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
6234c609719bSwdenknew address in RAM.
6235c609719bSwdenk
6236c609719bSwdenk
6237c609719bSwdenkU-Boot Porting Guide:
6238c609719bSwdenk----------------------
6239c609719bSwdenk
6240c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
62416aff3115Swdenklist, October 2002]
6242c609719bSwdenk
6243c609719bSwdenk
6244c609719bSwdenkint main(int argc, char *argv[])
6245c609719bSwdenk{
6246c609719bSwdenk	sighandler_t no_more_time;
6247c609719bSwdenk
6248c609719bSwdenk	signal(SIGALRM, no_more_time);
6249c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
6250c609719bSwdenk
6251c609719bSwdenk	if (available_money > available_manpower) {
62526c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
6253c609719bSwdenk		return 0;
6254c609719bSwdenk	}
6255c609719bSwdenk
6256c609719bSwdenk	Download latest U-Boot source;
6257c609719bSwdenk
62580668236bSWolfgang Denk	Subscribe to u-boot mailing list;
62596aff3115Swdenk
62606c3fef28SJerry Van Baren	if (clueless)
6261c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
6262c609719bSwdenk
6263c609719bSwdenk	while (learning) {
6264c609719bSwdenk		Read the README file in the top level directory;
62657cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
62666c3fef28SJerry Van Baren		Read applicable doc/*.README;
6267c609719bSwdenk		Read the source, Luke;
62686c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
6269c609719bSwdenk	}
6270c609719bSwdenk
62716c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
62726c3fef28SJerry Van Baren		Buy a BDI3000;
62736c3fef28SJerry Van Baren	else
6274c609719bSwdenk		Add a lot of aggravation and time;
6275c609719bSwdenk
62766c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
62776c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
62786c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
62796c3fef28SJerry Van Baren	} else {
6280c609719bSwdenk		Create your own board support subdirectory;
62816c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
62826c3fef28SJerry Van Baren	}
62836c3fef28SJerry Van Baren	Edit new board/<myboard> files
62846c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
6285c609719bSwdenk
62866c3fef28SJerry Van Baren	while (!accepted) {
6287c609719bSwdenk		while (!running) {
6288c609719bSwdenk			do {
6289c609719bSwdenk				Add / modify source code;
6290c609719bSwdenk			} until (compiles);
6291c609719bSwdenk			Debug;
6292c609719bSwdenk			if (clueless)
6293c609719bSwdenk				email("Hi, I am having problems...");
6294c609719bSwdenk		}
62956c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
62966c3fef28SJerry Van Baren		if (reasonable critiques)
62976c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
62986c3fef28SJerry Van Baren		else
62996c3fef28SJerry Van Baren			Defend code as written;
63006c3fef28SJerry Van Baren	}
6301c609719bSwdenk
6302c609719bSwdenk	return 0;
6303c609719bSwdenk}
6304c609719bSwdenk
6305c609719bSwdenkvoid no_more_time (int sig)
6306c609719bSwdenk{
6307c609719bSwdenk      hire_a_guru();
6308c609719bSwdenk}
6309c609719bSwdenk
6310c609719bSwdenk
6311c609719bSwdenkCoding Standards:
6312c609719bSwdenk-----------------
6313c609719bSwdenk
6314c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
63152c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
63167ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
6317c609719bSwdenk
63182c051651SDetlev ZundelSource files originating from a different project (for example the
63192c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
63202c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
63212c051651SDetlev Zundelsources.
63222c051651SDetlev Zundel
63232c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
63242c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
63252c051651SDetlev Zundelin your code.
6326c609719bSwdenk
6327c178d3daSwdenkPlease also stick to the following formatting rules:
6328180d3f74Swdenk- remove any trailing white space
63297ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
6330180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
63317ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
6332180d3f74Swdenk- do not add trailing empty lines to source files
6333180d3f74Swdenk
6334c609719bSwdenkSubmissions which do not conform to the standards may be returned
6335c609719bSwdenkwith a request to reformat the changes.
6336c609719bSwdenk
6337c609719bSwdenk
6338c609719bSwdenkSubmitting Patches:
6339c609719bSwdenk-------------------
6340c609719bSwdenk
6341c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
6342c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
6343c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
6344c609719bSwdenk
63450d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
6346218ca724SWolfgang Denk
63470668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
63480668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
63490668236bSWolfgang Denk
6350c609719bSwdenkWhen you send a patch, please include the following information with
6351c609719bSwdenkit:
6352c609719bSwdenk
6353c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
6354c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
6355c609719bSwdenk  patch actually fixes something.
6356c609719bSwdenk
6357c609719bSwdenk* For new features: a description of the feature and your
6358c609719bSwdenk  implementation.
6359c609719bSwdenk
6360c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
6361c609719bSwdenk
6362c609719bSwdenk* For major contributions, your entry to the CREDITS file
6363c609719bSwdenk
636427af930eSAlbert ARIBAUD* When you add support for a new board, don't forget to add a
636527af930eSAlbert ARIBAUD  maintainer e-mail address to the boards.cfg file, too.
6366c609719bSwdenk
6367c609719bSwdenk* If your patch adds new configuration options, don't forget to
6368c609719bSwdenk  document these in the README file.
6369c609719bSwdenk
6370218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
6371218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
63727ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
6373218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
6374218ca724SWolfgang Denk  with some other mail clients.
6375c609719bSwdenk
6376218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
6377218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
6378218ca724SWolfgang Denk  GNU diff.
63796dff5529Swdenk
6380218ca724SWolfgang Denk  The current directory when running this command shall be the parent
6381218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
6382218ca724SWolfgang Denk  your patch includes sufficient directory information for the
6383218ca724SWolfgang Denk  affected files).
6384218ca724SWolfgang Denk
6385218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
6386218ca724SWolfgang Denk  and compressed attachments must not be used.
6387c609719bSwdenk
638852f52c14Swdenk* If one logical set of modifications affects or creates several
638952f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
639052f52c14Swdenk
639152f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
639252f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
639352f52c14Swdenk
639452f52c14Swdenk
6395c609719bSwdenkNotes:
6396c609719bSwdenk
6397c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
6398c609719bSwdenk  source tree and make sure that no errors or warnings are reported
6399c609719bSwdenk  for any of the boards.
6400c609719bSwdenk
6401c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
6402c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
6403c609719bSwdenk  returned with a request to re-formatting / split it.
6404c609719bSwdenk
6405c609719bSwdenk* If you modify existing code, make sure that your new code does not
6406c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
6407c609719bSwdenk  When adding new features, these should compile conditionally only
6408c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
6409c609719bSwdenk  disabled must not need more memory than the old code without your
6410c609719bSwdenk  modification.
641190dc6704Swdenk
64120668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
64130668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
64140668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
64150668236bSWolfgang Denk  bigger than the size limit should be avoided.
6416