xref: /openbmc/u-boot/README (revision 6b9e309a8a7f0f33252288f0ed8794a83a488301)
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
1358d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1368d321b81SPeter Tyser    /cpu		CPU specific files
1378d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1388d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1396eb0921aSAndreas Bießmann	/at91		Files specific to Atmel AT91RM9200 CPU
1408d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1418d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1428d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1438d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1448d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1458d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1468d321b81SPeter Tyser    /lib		Architecture specific library files
1478d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1488d321b81SPeter Tyser    /cpu		CPU specific files
1498d321b81SPeter Tyser    /lib		Architecture specific library files
1508d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1518d321b81SPeter Tyser    /cpu		CPU specific files
1528d321b81SPeter Tyser    /lib		Architecture specific library files
1538d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1548d321b81SPeter Tyser    /cpu		CPU specific files
1558d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1568d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1578d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1588d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1598d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1608d321b81SPeter Tyser    /lib		Architecture specific library files
1618d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1628d321b81SPeter Tyser    /cpu		CPU specific files
1638d321b81SPeter Tyser    /lib		Architecture specific library files
1648d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1658d321b81SPeter Tyser    /cpu		CPU specific files
16692bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
16780421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1688d321b81SPeter Tyser    /lib		Architecture specific library files
169afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
170afc1ce82SMacpaul Lin    /cpu		CPU specific files
171afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
172afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1738d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1748d321b81SPeter Tyser    /cpu		CPU specific files
1758d321b81SPeter Tyser    /lib		Architecture specific library files
17633c7731bSRobert P. J. Day  /openrisc		Files generic to OpenRISC architecture
17733c7731bSRobert P. J. Day    /cpu		CPU specific files
17833c7731bSRobert P. J. Day    /lib		Architecture specific library files
179a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1808d321b81SPeter Tyser    /cpu		CPU specific files
1818d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1828d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1838d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1848d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1858d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
1868d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
1878d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
1888d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
1898d321b81SPeter Tyser    /lib		Architecture specific library files
1908d321b81SPeter Tyser  /sh			Files generic to SH architecture
1918d321b81SPeter Tyser    /cpu		CPU specific files
1928d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
1938d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
1948d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
1958d321b81SPeter Tyser    /lib		Architecture specific library files
1968d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
1978d321b81SPeter Tyser    /cpu		CPU specific files
1988d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
1998d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2008d321b81SPeter Tyser    /lib		Architecture specific library files
20133c7731bSRobert P. J. Day  /x86			Files generic to x86 architecture
20233c7731bSRobert P. J. Day    /cpu		CPU specific files
20333c7731bSRobert P. J. Day    /lib		Architecture specific library files
2048d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2058d321b81SPeter Tyser/board			Board dependent files
2068d321b81SPeter Tyser/common			Misc architecture independent functions
2078d321b81SPeter Tyser/disk			Code for disk drive partition handling
2088d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2098d321b81SPeter Tyser/drivers		Commonly used device drivers
21033c7731bSRobert P. J. Day/dts			Contains Makefile for building internal U-Boot fdt.
2118d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2128d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2138d321b81SPeter Tyser/include		Header Files
2148d321b81SPeter Tyser/lib			Files generic to all architectures
2158d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2168d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2178d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2188d321b81SPeter Tyser/net			Networking code
2198d321b81SPeter Tyser/post			Power On Self Test
22033c7731bSRobert P. J. Day/spl			Secondary Program Loader framework
2218d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
222c609719bSwdenk
223c609719bSwdenkSoftware Configuration:
224c609719bSwdenk=======================
225c609719bSwdenk
226c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
227c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
228c609719bSwdenk
229c609719bSwdenkThere are two classes of configuration variables:
230c609719bSwdenk
231c609719bSwdenk* Configuration _OPTIONS_:
232c609719bSwdenk  These are selectable by the user and have names beginning with
233c609719bSwdenk  "CONFIG_".
234c609719bSwdenk
235c609719bSwdenk* Configuration _SETTINGS_:
236c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
237c609719bSwdenk  you don't know what you're doing; they have names beginning with
2386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
239c609719bSwdenk
240c609719bSwdenkLater we will add a configuration tool - probably similar to or even
241c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
242c609719bSwdenkdo the configuration by hand, which means creating some symbolic
243c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
244c609719bSwdenkas an example here.
245c609719bSwdenk
246c609719bSwdenk
247c609719bSwdenkSelection of Processor Architecture and Board Type:
248c609719bSwdenk---------------------------------------------------
249c609719bSwdenk
250c609719bSwdenkFor all supported boards there are ready-to-use default
251c609719bSwdenkconfigurations available; just type "make <board_name>_config".
252c609719bSwdenk
253c609719bSwdenkExample: For a TQM823L module type:
254c609719bSwdenk
255c609719bSwdenk	cd u-boot
256c609719bSwdenk	make TQM823L_config
257c609719bSwdenk
25811ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
259c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
260c609719bSwdenkdirectory according to the instructions in cogent/README.
261c609719bSwdenk
262c609719bSwdenk
263c609719bSwdenkConfiguration Options:
264c609719bSwdenk----------------------
265c609719bSwdenk
266c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
267c609719bSwdenksuch information is kept in a configuration file
268c609719bSwdenk"include/configs/<board_name>.h".
269c609719bSwdenk
270c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
271c609719bSwdenk"include/configs/TQM823L.h".
272c609719bSwdenk
273c609719bSwdenk
2747f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2757f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2767f6c2cbcSwdenkbuild a config tool - later.
2777f6c2cbcSwdenk
2787f6c2cbcSwdenk
279c609719bSwdenkThe following options need to be configured:
280c609719bSwdenk
2812628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
282c609719bSwdenk
2832628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2846ccec449SWolfgang Denk
2856ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
28609ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
287c609719bSwdenk
288c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
289c609719bSwdenk		Define exactly one of
290c609719bSwdenk		CONFIG_CMA286_60_OLD
291c609719bSwdenk--- FIXME --- not tested yet:
292c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
293c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
294c609719bSwdenk
295c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
296c609719bSwdenk		Define exactly one of
297c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
298c609719bSwdenk
299c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
300c609719bSwdenk		Define one or more of
301c609719bSwdenk		CONFIG_CMA302
302c609719bSwdenk
303c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
304c609719bSwdenk		Define one or more of
305c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
30611ccc33fSMarcel Ziswiler					  the LCD display every second with
307c609719bSwdenk					  a "rotator" |\-/|\-/
308c609719bSwdenk
3092535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3102535d602Swdenk		CONFIG_ADSTYPE
3112535d602Swdenk		Possible values are:
3126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3162535d602Swdenk
317cf946c6dSLei Wen- Marvell Family Member
318cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
319cf946c6dSLei Wen					  multiple fs option at one time
320cf946c6dSLei Wen					  for marvell soc family
321cf946c6dSLei Wen
322c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
323c609719bSwdenk		Define exactly one of
324c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
325c609719bSwdenk
32611ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
32766ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
32866ca92a5Swdenk					  get_gclk_freq() cannot work
3295da627a4Swdenk					  e.g. if there is no 32KHz
3305da627a4Swdenk					  reference PIT/RTC clock
33166ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
33266ca92a5Swdenk					  or XTAL/EXTAL)
333c609719bSwdenk
33466ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
33766ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
33875d1ea7fSwdenk			See doc/README.MPC866
33975d1ea7fSwdenk
3406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
34175d1ea7fSwdenk
34275d1ea7fSwdenk		Define this to measure the actual CPU clock instead
34375d1ea7fSwdenk		of relying on the correctness of the configured
34475d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
34575d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
34675d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
34875d1ea7fSwdenk
349506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
350506f3918SHeiko Schocher
351506f3918SHeiko Schocher		Define this option if you want to enable the
352506f3918SHeiko Schocher		ICache only when Code runs from RAM.
353506f3918SHeiko Schocher
35466412c63SKumar Gala- 85xx CPU Options:
355ffd06e02SYork Sun		CONFIG_SYS_PPC64
356ffd06e02SYork Sun
357ffd06e02SYork Sun		Specifies that the core is a 64-bit PowerPC implementation (implements
358ffd06e02SYork Sun		the "64" category of the Power ISA). This is necessary for ePAPR
359ffd06e02SYork Sun		compliance, among other possible reasons.
360ffd06e02SYork Sun
36166412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36266412c63SKumar Gala
36366412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
36466412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
36566412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
36666412c63SKumar Gala
3678f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3688f29084aSKumar Gala
3698f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3708f29084aSKumar Gala		tree nodes for the given platform.
3718f29084aSKumar Gala
372afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
373afa6b551SPrabhakar Kushwaha
374afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
375afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
376afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
377afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
378afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
379afa6b551SPrabhakar Kushwaha		purpose.
380afa6b551SPrabhakar Kushwaha
38133eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
38233eee330SScott Wood
38333eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
38433eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
38533eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
38633eee330SScott Wood
38733eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
38833eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
38933eee330SScott Wood
39033eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
39133eee330SScott Wood		for which the A004510 workaround should be applied.
39233eee330SScott Wood
39333eee330SScott Wood		The rest of SVR is either not relevant to the decision
39433eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
39533eee330SScott Wood		p2041) or is implied by the build target, which controls
39633eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
39733eee330SScott Wood
39833eee330SScott Wood		See Freescale App Note 4493 for more information about
39933eee330SScott Wood		this erratum.
40033eee330SScott Wood
40174fa22edSPrabhakar Kushwaha		CONFIG_A003399_NOR_WORKAROUND
40274fa22edSPrabhakar Kushwaha		Enables a workaround for IFC erratum A003399. It is only
40374fa22edSPrabhakar Kushwaha		requred during NOR boot.
40474fa22edSPrabhakar Kushwaha
40533eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
40633eee330SScott Wood
40733eee330SScott Wood		This is the value to write into CCSR offset 0x18600
40833eee330SScott Wood		according to the A004510 workaround.
40933eee330SScott Wood
41064501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_DDR_ADDR
41164501c66SPriyanka Jain		This value denotes start offset of DDR memory which is
41264501c66SPriyanka Jain		connected exclusively to the DSP cores.
41364501c66SPriyanka Jain
414765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
415765b0bdbSPriyanka Jain		This value denotes start offset of M2 memory
416765b0bdbSPriyanka Jain		which is directly connected to the DSP core.
417765b0bdbSPriyanka Jain
41864501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
41964501c66SPriyanka Jain		This value denotes start offset of M3 memory which is directly
42064501c66SPriyanka Jain		connected to the DSP core.
42164501c66SPriyanka Jain
422765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
423765b0bdbSPriyanka Jain		This value denotes start offset of DSP CCSR space.
424765b0bdbSPriyanka Jain
425b135991aSPriyanka Jain		CONFIG_SYS_FSL_SINGLE_SOURCE_CLK
426b135991aSPriyanka Jain		Single Source Clock is clocking mode present in some of FSL SoC's.
427b135991aSPriyanka Jain		In this mode, a single differential clock is used to supply
428b135991aSPriyanka Jain		clocks to the sysclock, ddrclock and usbclock.
429b135991aSPriyanka Jain
4306cb461b4SDaniel Schwierzeck- Generic CPU options:
4316cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
4326cb461b4SDaniel Schwierzeck
4336cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
4346cb461b4SDaniel Schwierzeck		values is arch specific.
4356cb461b4SDaniel Schwierzeck
4365614e71bSYork Sun		CONFIG_SYS_FSL_DDR
4375614e71bSYork Sun		Freescale DDR driver in use. This type of DDR controller is
4385614e71bSYork Sun		found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core
4395614e71bSYork Sun		SoCs.
4405614e71bSYork Sun
4415614e71bSYork Sun		CONFIG_SYS_FSL_DDR_ADDR
4425614e71bSYork Sun		Freescale DDR memory-mapped register base.
4435614e71bSYork Sun
4445614e71bSYork Sun		CONFIG_SYS_FSL_DDR_EMU
4455614e71bSYork Sun		Specify emulator support for DDR. Some DDR features such as
4465614e71bSYork Sun		deskew training are not available.
4475614e71bSYork Sun
4485614e71bSYork Sun		CONFIG_SYS_FSL_DDRC_GEN1
4495614e71bSYork Sun		Freescale DDR1 controller.
4505614e71bSYork Sun
4515614e71bSYork Sun		CONFIG_SYS_FSL_DDRC_GEN2
4525614e71bSYork Sun		Freescale DDR2 controller.
4535614e71bSYork Sun
4545614e71bSYork Sun		CONFIG_SYS_FSL_DDRC_GEN3
4555614e71bSYork Sun		Freescale DDR3 controller.
4565614e71bSYork Sun
4579ac4ffbdSYork Sun		CONFIG_SYS_FSL_DDRC_ARM_GEN3
4589ac4ffbdSYork Sun		Freescale DDR3 controller for ARM-based SoCs.
4599ac4ffbdSYork Sun
4605614e71bSYork Sun		CONFIG_SYS_FSL_DDR1
4615614e71bSYork Sun		Board config to use DDR1. It can be enabled for SoCs with
4625614e71bSYork Sun		Freescale DDR1 or DDR2 controllers, depending on the board
4635614e71bSYork Sun		implemetation.
4645614e71bSYork Sun
4655614e71bSYork Sun		CONFIG_SYS_FSL_DDR2
4665614e71bSYork Sun		Board config to use DDR2. It can be eanbeld for SoCs with
4675614e71bSYork Sun		Freescale DDR2 or DDR3 controllers, depending on the board
4685614e71bSYork Sun		implementation.
4695614e71bSYork Sun
4705614e71bSYork Sun		CONFIG_SYS_FSL_DDR3
4715614e71bSYork Sun		Board config to use DDR3. It can be enabled for SoCs with
4725614e71bSYork Sun		Freescale DDR3 controllers.
4735614e71bSYork Sun
4741b4175d6SPrabhakar Kushwaha		CONFIG_SYS_FSL_IFC_BE
4751b4175d6SPrabhakar Kushwaha		Defines the IFC controller register space as Big Endian
4761b4175d6SPrabhakar Kushwaha
4771b4175d6SPrabhakar Kushwaha		CONFIG_SYS_FSL_IFC_LE
4781b4175d6SPrabhakar Kushwaha		Defines the IFC controller register space as Little Endian
4791b4175d6SPrabhakar Kushwaha
480690e4258SPrabhakar Kushwaha		CONFIG_SYS_FSL_PBL_PBI
481690e4258SPrabhakar Kushwaha		It enables addition of RCW (Power on reset configuration) in built image.
482690e4258SPrabhakar Kushwaha		Please refer doc/README.pblimage for more details
483690e4258SPrabhakar Kushwaha
484690e4258SPrabhakar Kushwaha		CONFIG_SYS_FSL_PBL_RCW
485690e4258SPrabhakar Kushwaha		It adds PBI(pre-boot instructions) commands in u-boot build image.
486690e4258SPrabhakar Kushwaha		PBI commands can be used to configure SoC before it starts the execution.
487690e4258SPrabhakar Kushwaha		Please refer doc/README.pblimage for more details
488690e4258SPrabhakar Kushwaha
4894e5b1bd0SYork Sun		CONFIG_SYS_FSL_DDR_BE
4904e5b1bd0SYork Sun		Defines the DDR controller register space as Big Endian
4914e5b1bd0SYork Sun
4924e5b1bd0SYork Sun		CONFIG_SYS_FSL_DDR_LE
4934e5b1bd0SYork Sun		Defines the DDR controller register space as Little Endian
4944e5b1bd0SYork Sun
495*6b9e309aSYork Sun		CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY
496*6b9e309aSYork Sun		Physical address from the view of DDR controllers. It is the
497*6b9e309aSYork Sun		same as CONFIG_SYS_DDR_SDRAM_BASE for  all Power SoCs. But
498*6b9e309aSYork Sun		it could be different for ARM SoCs.
499*6b9e309aSYork Sun
5000b953ffcSMarkus Klotzbuecher- Intel Monahans options:
5016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
5020b953ffcSMarkus Klotzbuecher
5030b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
5040b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
5050b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
5060b953ffcSMarkus Klotzbuecher
5076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
5080b953ffcSMarkus Klotzbuecher
5090b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
5100b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
5110b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
5120b953ffcSMarkus Klotzbuecher		by this value.
5130b953ffcSMarkus Klotzbuecher
51492bbd64eSDaniel Schwierzeck- MIPS CPU options:
51592bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
51692bbd64eSDaniel Schwierzeck
51792bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
51892bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
51992bbd64eSDaniel Schwierzeck		relocation.
52092bbd64eSDaniel Schwierzeck
52192bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
52292bbd64eSDaniel Schwierzeck
52392bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
52492bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
52592bbd64eSDaniel Schwierzeck		Possible values are:
52692bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
52792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
52892bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
52992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
53092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
53192bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
53292bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
53392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
53492bbd64eSDaniel Schwierzeck
53592bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
53692bbd64eSDaniel Schwierzeck
53792bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
53892bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
53992bbd64eSDaniel Schwierzeck
54092bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
54192bbd64eSDaniel Schwierzeck
54292bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
54392bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
54492bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
54592bbd64eSDaniel Schwierzeck
546b67d8816SChristian Riesch- ARM options:
547b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
548b67d8816SChristian Riesch
549b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
550b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
551b67d8816SChristian Riesch
5525356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
5535356f545SAneesh V
5545356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
5555356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
5565356f545SAneesh V		better code density. For ARM architectures that support
5575356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
5585356f545SAneesh V		GCC.
5595356f545SAneesh V
560c5d4752cSStephen Warren		CONFIG_ARM_ERRATA_716044
5610678587fSStephen Warren		CONFIG_ARM_ERRATA_742230
5620678587fSStephen Warren		CONFIG_ARM_ERRATA_743622
5630678587fSStephen Warren		CONFIG_ARM_ERRATA_751472
5640678587fSStephen Warren
5650678587fSStephen Warren		If set, the workarounds for these ARM errata are applied early
5660678587fSStephen Warren		during U-Boot startup. Note that these options force the
5670678587fSStephen Warren		workarounds to be applied; no CPU-type/version detection
5680678587fSStephen Warren		exists, unlike the similar options in the Linux kernel. Do not
5690678587fSStephen Warren		set these options unless they apply!
5700678587fSStephen Warren
571795659dcSStephen Warren- CPU timer options:
572795659dcSStephen Warren		CONFIG_SYS_HZ
573795659dcSStephen Warren
574795659dcSStephen Warren		The frequency of the timer returned by get_timer().
575795659dcSStephen Warren		get_timer() must operate in milliseconds and this CONFIG
576795659dcSStephen Warren		option must be set to 1000.
577795659dcSStephen Warren
5785da627a4Swdenk- Linux Kernel Interface:
579c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
580c609719bSwdenk
581c609719bSwdenk		U-Boot stores all clock information in Hz
582c609719bSwdenk		internally. For binary compatibility with older Linux
583c609719bSwdenk		kernels (which expect the clocks passed in the
584c609719bSwdenk		bd_info data to be in MHz) the environment variable
585c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
586c609719bSwdenk		converts clock data to MHZ before passing it to the
587c609719bSwdenk		Linux kernel.
588c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
589c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
590c609719bSwdenk		default environment.
591c609719bSwdenk
5925da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
5935da627a4Swdenk
59411ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
5955da627a4Swdenk		expect it to be in bytes, others in MB.
5965da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
5975da627a4Swdenk
598fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
599f57f70aaSWolfgang Denk
600f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
601213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
602213bf8c8SGerald Van Baren		concepts).
603213bf8c8SGerald Van Baren
604213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
605213bf8c8SGerald Van Baren		 * New libfdt-based support
606213bf8c8SGerald Van Baren		 * Adds the "fdt" command
6073bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
608213bf8c8SGerald Van Baren
609b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
610b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
611b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
612b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
613f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
614c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
615f57f70aaSWolfgang Denk
61611ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
61711ccc33fSMarcel Ziswiler		addresses
6183bb342fcSKim Phillips
6194e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
6204e253137SKumar Gala
6214e253137SKumar Gala		Board code has addition modification that it wants to make
6224e253137SKumar Gala		to the flat device tree before handing it off to the kernel
6236705d81eSwdenk
6240267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
6250267768eSMatthew McClintock
62611ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
6270267768eSMatthew McClintock		param header, the default value is zero if undefined.
6280267768eSMatthew McClintock
6293887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
6303887c3fbSHeiko Schocher
6313887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
6323887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
6333887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
6343887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
6353887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
6363887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
6373887c3fbSHeiko Schocher
6387eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
6397eb29398SIgor Grinberg
6407eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
6417eb29398SIgor Grinberg		machine type and must be used to specify the machine type
6427eb29398SIgor Grinberg		number as it appears in the ARM machine registry
6437eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
6447eb29398SIgor Grinberg		Only boards that have multiple machine types supported
6457eb29398SIgor Grinberg		in a single configuration file and the machine type is
6467eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
6477eb29398SIgor Grinberg
6480b2f4ecaSNiklaus Giger- vxWorks boot parameters:
6490b2f4ecaSNiklaus Giger
6500b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
6510b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
6520b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
6530b2f4ecaSNiklaus Giger
6540b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
6550b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
6560b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
6570b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
6580b2f4ecaSNiklaus Giger
6590b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
6600b2f4ecaSNiklaus Giger
6610b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
6620b2f4ecaSNiklaus Giger
6630b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
6640b2f4ecaSNiklaus Giger		the defaults discussed just above.
6650b2f4ecaSNiklaus Giger
6662c451f78SAneesh V- Cache Configuration:
6672c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
6682c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
6692c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
6702c451f78SAneesh V
67193bc2193SAneesh V- Cache Configuration for ARM:
67293bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
67393bc2193SAneesh V				      controller
67493bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
67593bc2193SAneesh V					controller register space
67693bc2193SAneesh V
6776705d81eSwdenk- Serial Ports:
67848d0192fSAndreas Engel		CONFIG_PL010_SERIAL
6796705d81eSwdenk
6806705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
6816705d81eSwdenk
68248d0192fSAndreas Engel		CONFIG_PL011_SERIAL
6836705d81eSwdenk
6846705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
6856705d81eSwdenk
6866705d81eSwdenk		CONFIG_PL011_CLOCK
6876705d81eSwdenk
6886705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
6896705d81eSwdenk		the clock speed of the UARTs.
6906705d81eSwdenk
6916705d81eSwdenk		CONFIG_PL01x_PORTS
6926705d81eSwdenk
6936705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
6946705d81eSwdenk		define this to a list of base addresses for each (supported)
6956705d81eSwdenk		port. See e.g. include/configs/versatile.h
6966705d81eSwdenk
697910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
698910f1ae3SJohn Rigby
699910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
700910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
701910f1ae3SJohn Rigby		this variable to initialize the extra register.
702910f1ae3SJohn Rigby
703910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
704910f1ae3SJohn Rigby
705910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
706910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
707910f1ae3SJohn Rigby		variable to flush the UART at init time.
708910f1ae3SJohn Rigby
7096705d81eSwdenk
710c609719bSwdenk- Console Interface:
711c609719bSwdenk		Depending on board, define exactly one serial port
712c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
713c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
714c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
715c609719bSwdenk
716c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
717c609719bSwdenk		port routines must be defined elsewhere
718c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
719c609719bSwdenk
720c609719bSwdenk		CONFIG_CFB_CONSOLE
721c609719bSwdenk		Enables console device for a color framebuffer. Needs following
722c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
723c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
724c609719bSwdenk						(default big endian)
725c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
726c609719bSwdenk						rectangle fill
727c609719bSwdenk						(cf. smiLynxEM)
728c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
729c609719bSwdenk						bit-blit (cf. smiLynxEM)
730c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
731c609719bSwdenk						(cols=pitch)
732c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
733c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
734c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
735c609719bSwdenk						(0-5, cf. cfb_console.c)
736c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
737c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
738c609719bSwdenk						(i.e. i8042_kbd_init())
739c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
740c609719bSwdenk						(i.e. i8042_tstc)
741c609719bSwdenk			VIDEO_GETC_FCT		get char fct
742c609719bSwdenk						(i.e. i8042_getc)
743c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
744c609719bSwdenk						(requires blink timer
745c609719bSwdenk						cf. i8042.c)
7466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
747c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
748c609719bSwdenk						upper right corner
749602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
750c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
751c609719bSwdenk						upper left corner
752a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
753a6c7ad2fSwdenk						linux_logo.h for logo.
754a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
755c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
75611ccc33fSMarcel Ziswiler						additional board info beside
757c609719bSwdenk						the logo
758c609719bSwdenk
75933a35bbbSPali Rohár		When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
76033a35bbbSPali Rohár		a limited number of ANSI escape sequences (cursor control,
76133a35bbbSPali Rohár		erase functions and limited graphics rendition control).
76233a35bbbSPali Rohár
763c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
764c609719bSwdenk		default i/o. Serial console can be forced with
765c609719bSwdenk		environment 'console=serial'.
766c609719bSwdenk
767a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
768a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
769a3ad8e26Swdenk		the "silent" environment variable. See
770a3ad8e26Swdenk		doc/README.silent for more information.
771a3ad8e26Swdenk
77245ae2546SHeiko Schocher		CONFIG_SYS_CONSOLE_BG_COL: define the backgroundcolor, default
77345ae2546SHeiko Schocher			is 0x00.
77445ae2546SHeiko Schocher		CONFIG_SYS_CONSOLE_FG_COL: define the foregroundcolor, default
77545ae2546SHeiko Schocher			is 0xa0.
77645ae2546SHeiko Schocher
777c609719bSwdenk- Console Baudrate:
778c609719bSwdenk		CONFIG_BAUDRATE - in bps
779c609719bSwdenk		Select one of the baudrates listed in
7806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
7816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
782c609719bSwdenk
783c92fac91SHeiko Schocher- Console Rx buffer length
784c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
785c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
7862b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
787c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
788c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
789c92fac91SHeiko Schocher		the SMC.
790c92fac91SHeiko Schocher
7919558b48aSGraeme Russ- Pre-Console Buffer:
7929558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
7939558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
7949558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
7959558b48aSGraeme Russ		buffer any console messages prior to the console being
7969558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
7979558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
7989558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
7999558b48aSGraeme Russ		bytes are output before the console is initialised, the
8009558b48aSGraeme Russ		earlier bytes are discarded.
8019558b48aSGraeme Russ
8029558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
8039558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
8049558b48aSGraeme Russ
805046a37bdSSonny Rao- Safe printf() functions
806046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
807046a37bdSSonny Rao		the printf() functions. These are defined in
808046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
809046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
810046a37bdSSonny Rao		If this option is not given then these functions will
811046a37bdSSonny Rao		silently discard their buffer size argument - this means
812046a37bdSSonny Rao		you are not getting any overflow checking in this case.
813046a37bdSSonny Rao
814c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
815c609719bSwdenk		Delay before automatically booting the default image;
816c609719bSwdenk		set to -1 to disable autoboot.
81793d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
81893d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
819c609719bSwdenk
820c609719bSwdenk		See doc/README.autoboot for these options that
821c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
822c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
823c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
824c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
825c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
826c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
827c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
828c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
829c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
830c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
831c609719bSwdenk		CONFIG_RESET_TO_RETRY
832c609719bSwdenk
833c609719bSwdenk- Autoboot Command:
834c609719bSwdenk		CONFIG_BOOTCOMMAND
835c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
836c609719bSwdenk		define a command string that is automatically executed
837c609719bSwdenk		when no character is read on the console interface
838c609719bSwdenk		within "Boot Delay" after reset.
839c609719bSwdenk
840c609719bSwdenk		CONFIG_BOOTARGS
841c609719bSwdenk		This can be used to pass arguments to the bootm
842c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
843c609719bSwdenk		environment value "bootargs".
844c609719bSwdenk
845c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
846c609719bSwdenk		The value of these goes into the environment as
847c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
848c609719bSwdenk		as a convenience, when switching between booting from
84911ccc33fSMarcel Ziswiler		RAM and NFS.
850c609719bSwdenk
851eda0ba38SHeiko Schocher- Bootcount:
852eda0ba38SHeiko Schocher		CONFIG_BOOTCOUNT_LIMIT
853eda0ba38SHeiko Schocher		Implements a mechanism for detecting a repeating reboot
854eda0ba38SHeiko Schocher		cycle, see:
855eda0ba38SHeiko Schocher		http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
856eda0ba38SHeiko Schocher
857eda0ba38SHeiko Schocher		CONFIG_BOOTCOUNT_ENV
858eda0ba38SHeiko Schocher		If no softreset save registers are found on the hardware
859eda0ba38SHeiko Schocher		"bootcount" is stored in the environment. To prevent a
860eda0ba38SHeiko Schocher		saveenv on all reboots, the environment variable
861eda0ba38SHeiko Schocher		"upgrade_available" is used. If "upgrade_available" is
862eda0ba38SHeiko Schocher		0, "bootcount" is always 0, if "upgrade_available" is
863eda0ba38SHeiko Schocher		1 "bootcount" is incremented in the environment.
864eda0ba38SHeiko Schocher		So the Userspace Applikation must set the "upgrade_available"
865eda0ba38SHeiko Schocher		and "bootcount" variable to 0, if a boot was successfully.
866eda0ba38SHeiko Schocher
867c609719bSwdenk- Pre-Boot Commands:
868c609719bSwdenk		CONFIG_PREBOOT
869c609719bSwdenk
870c609719bSwdenk		When this option is #defined, the existence of the
871c609719bSwdenk		environment variable "preboot" will be checked
872c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
873c609719bSwdenk		countdown and/or running the auto-boot command resp.
874c609719bSwdenk		entering interactive mode.
875c609719bSwdenk
876c609719bSwdenk		This feature is especially useful when "preboot" is
877c609719bSwdenk		automatically generated or modified. For an example
878c609719bSwdenk		see the LWMON board specific code: here "preboot" is
879c609719bSwdenk		modified when the user holds down a certain
880c609719bSwdenk		combination of keys on the (special) keyboard when
881c609719bSwdenk		booting the systems
882c609719bSwdenk
883c609719bSwdenk- Serial Download Echo Mode:
884c609719bSwdenk		CONFIG_LOADS_ECHO
885c609719bSwdenk		If defined to 1, all characters received during a
886c609719bSwdenk		serial download (using the "loads" command) are
887c609719bSwdenk		echoed back. This might be needed by some terminal
888c609719bSwdenk		emulations (like "cu"), but may as well just take
889c609719bSwdenk		time on others. This setting #define's the initial
890c609719bSwdenk		value of the "loads_echo" environment variable.
891c609719bSwdenk
892602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
893c609719bSwdenk		CONFIG_KGDB_BAUDRATE
894c609719bSwdenk		Select one of the baudrates listed in
8956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
896c609719bSwdenk
897c609719bSwdenk- Monitor Functions:
898602ad3b3SJon Loeliger		Monitor commands can be included or excluded
899602ad3b3SJon Loeliger		from the build by using the #include files
900c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
901c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
902602ad3b3SJon Loeliger		and augmenting with additional #define's
903602ad3b3SJon Loeliger		for wanted commands.
904c609719bSwdenk
905602ad3b3SJon Loeliger		The default command configuration includes all commands
906602ad3b3SJon Loeliger		except those marked below with a "*".
907602ad3b3SJon Loeliger
908602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
909602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
910602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
911602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
912602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
913602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
914602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
91508d0d6f3SMichal Simek		CONFIG_CMD_CLK   	* clock command support
916602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
917710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
918602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
919602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
920602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
921a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
922a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
923a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
924a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
925602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
926602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
927246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
928602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
929602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
9305e2b3e0cSJoe Hershberger		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
931fffad71bSJoe Hershberger		CONFIG_CMD_ENV_FLAGS	* display details about env flags
93288733e2cSAndrew Ruder		CONFIG_CMD_ENV_EXISTS	* check existence of env variable
9330c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
93403e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
93503e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
93616f4d933SStephen Warren		CONFIG_CMD_FS_GENERIC	* filesystem commands (e.g. load, ls)
93716f4d933SStephen Warren					  that work for multiple fs types
938bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
939602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
94003e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
941602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
942602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
9434d98b5c8SVincent Stehlé		CONFIG_CMD_FUSE		* Device fuse support
94453fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
945a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
946a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
947bf36c5d5SSimon Glass		CONFIG_CMD_HASH		* calculate hash / digest
948602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
949602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
950602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
951602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
9528fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS		  List all images found in NOR flash
9534d98b5c8SVincent Stehlé		CONFIG_CMD_IMLS_NAND	* List all images found in NAND flash
954602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
9550c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
956c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
957602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
958602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
959602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
960602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
9614d98b5c8SVincent Stehlé		CONFIG_CMD_LDRINFO	* ldrinfo (display Blackfin loader)
962d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
963d22c338eSJoe Hershberger					  (169.254.*.*)
964602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
965602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
9664d98b5c8SVincent Stehlé		CONFIG_CMD_MD5SUM	* print md5 message digest
96702c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
96815a33e49SSimon Glass		CONFIG_CMD_MEMINFO	* Display detailed memory information
969602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
970a2681707SWolfgang Denk					  loop, loopw
9714d98b5c8SVincent Stehlé		CONFIG_CMD_MEMTEST	* mtest
972602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
973602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
974602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
97568d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
976602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
977602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
9784d98b5c8SVincent Stehlé		CONFIG_CMD_NFS		  NFS support
979e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
980e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
981602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
982602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
983602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
984602ad3b3SJon Loeliger					  host
985602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
986ff048ea9SKenneth Waters		CONFIG_CMD_READ		* Read raw data from partition
987602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
988602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
989d304931fSSimon Glass		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
990602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
991602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
992602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
993602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
994602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
995602ad3b3SJon Loeliger					  (4xx only)
996f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
9974d98b5c8SVincent Stehlé		CONFIG_CMD_SHA1SUM	* print sha1 memory digest
99802c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
9997d861d95SBob Liu		CONFIG_CMD_SOFTSWITCH	* Soft switch setting command for BF60x
100074de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
1001602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
10027a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
10031fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
1004da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
1005da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
1006602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
1007602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
1008c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
10094d98b5c8SVincent Stehlé		CONFIG_CMD_XIMG		  Load part of Multi Image
1010c609719bSwdenk
1011c609719bSwdenk
1012c609719bSwdenk		EXAMPLE: If you want all functions except of network
1013c609719bSwdenk		support you can write:
1014c609719bSwdenk
1015602ad3b3SJon Loeliger		#include "config_cmd_all.h"
1016602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
1017c609719bSwdenk
1018213bf8c8SGerald Van Baren	Other Commands:
1019213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
1020c609719bSwdenk
1021c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
1022602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
1023c609719bSwdenk		what you (and your U-Boot users) are doing. Data
1024c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
1025c609719bSwdenk		8260 (where accesses to the IMMR region must be
1026c609719bSwdenk		uncached), and it cannot be disabled on all other
1027c609719bSwdenk		systems where we (mis-) use the data cache to hold an
1028c609719bSwdenk		initial stack and some data.
1029c609719bSwdenk
1030c609719bSwdenk
1031c609719bSwdenk		XXX - this list needs to get updated!
1032c609719bSwdenk
1033a5ecbe62SWolfgang Denk- Regular expression support:
1034a5ecbe62SWolfgang Denk		CONFIG_REGEX
1035a5ecbe62SWolfgang Denk		If this variable is defined, U-Boot is linked against
1036a5ecbe62SWolfgang Denk		the SLRE (Super Light Regular Expression) library,
1037a5ecbe62SWolfgang Denk		which adds regex support to some commands, as for
1038a5ecbe62SWolfgang Denk		example "env grep" and "setexpr".
1039a5ecbe62SWolfgang Denk
104045ba8077SSimon Glass- Device tree:
104145ba8077SSimon Glass		CONFIG_OF_CONTROL
104245ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
104345ba8077SSimon Glass		to configure its devices, instead of relying on statically
104445ba8077SSimon Glass		compiled #defines in the board file. This option is
104545ba8077SSimon Glass		experimental and only available on a few boards. The device
104645ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
104745ba8077SSimon Glass
10482c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
10492c0f79e4SSimon Glass		be done using one of the two options below:
1050bbb0b128SSimon Glass
1051bbb0b128SSimon Glass		CONFIG_OF_EMBED
1052bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
1053bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
1054bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
1055bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
1056bbb0b128SSimon Glass		the global data structure as gd->blob.
105745ba8077SSimon Glass
10582c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
10592c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
10602c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
10612c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
10622c0f79e4SSimon Glass
10632c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
10642c0f79e4SSimon Glass
10652c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
10662c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
10672c0f79e4SSimon Glass		still use the individual files if you need something more
10682c0f79e4SSimon Glass		exotic.
10692c0f79e4SSimon Glass
1070c609719bSwdenk- Watchdog:
1071c609719bSwdenk		CONFIG_WATCHDOG
1072c609719bSwdenk		If this variable is defined, it enables watchdog
10736abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
10746abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
10756abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
10766abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
10776abe6fb6SDetlev Zundel		available, then no further board specific code should
10786abe6fb6SDetlev Zundel		be needed to use it.
10796abe6fb6SDetlev Zundel
10806abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
10816abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
10826abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
10836abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
1084c609719bSwdenk
1085c1551ea8Sstroese- U-Boot Version:
1086c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
1087c1551ea8Sstroese		If this variable is defined, an environment variable
1088c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
1089c1551ea8Sstroese		version as printed by the "version" command.
1090a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
1091a1ea8e51SBenoît Thébaudeau		next reset.
1092c1551ea8Sstroese
1093c609719bSwdenk- Real-Time Clock:
1094c609719bSwdenk
1095602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
1096c609719bSwdenk		has to be selected, too. Define exactly one of the
1097c609719bSwdenk		following options:
1098c609719bSwdenk
1099c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
1100c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
11014e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
1102c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
11031cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
1104c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
11057f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
11063bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
11079536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
11084c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
11096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
111071d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
111171d19f30SHeiko Schocher					  RV3029 RTC.
1112c609719bSwdenk
1113b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
1114b37c7e5eSwdenk		must also be configured. See I2C Support, below.
1115b37c7e5eSwdenk
1116e92739d3SPeter Tyser- GPIO Support:
1117e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
1118e92739d3SPeter Tyser
11195dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
11205dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
11215dec49caSChris Packham		pins supported by a particular chip.
11225dec49caSChris Packham
1123e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
1124e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
1125e92739d3SPeter Tyser
1126c609719bSwdenk- Timestamp Support:
1127c609719bSwdenk
1128c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
1129c609719bSwdenk		(date and time) of an image is printed by image
1130c609719bSwdenk		commands like bootm or iminfo. This option is
1131602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1132c609719bSwdenk
1133923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1134923c46f9SKarl O. Pinc		Zero or more of the following:
1135923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1136923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1137923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1138923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1139923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1140923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1141923c46f9SKarl O. Pinc				       disk/part_efi.c
1142923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1143c609719bSwdenk
1144602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1145218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1146923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1147c609719bSwdenk
1148c609719bSwdenk- IDE Reset method:
11494d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
11504d13cbadSwdenk		board configurations files but used nowhere!
1151c609719bSwdenk
11524d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
11534d13cbadSwdenk		be performed by calling the function
11544d13cbadSwdenk			ide_set_reset(int reset)
11554d13cbadSwdenk		which has to be defined in a board specific file
1156c609719bSwdenk
1157c609719bSwdenk- ATAPI Support:
1158c609719bSwdenk		CONFIG_ATAPI
1159c609719bSwdenk
1160c609719bSwdenk		Set this to enable ATAPI support.
1161c609719bSwdenk
1162c40b2956Swdenk- LBA48 Support
1163c40b2956Swdenk		CONFIG_LBA48
1164c40b2956Swdenk
1165c40b2956Swdenk		Set this to enable support for disks larger than 137GB
11664b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1167c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1168c40b2956Swdenk		support disks up to 2.1TB.
1169c40b2956Swdenk
11706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1171c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1172c40b2956Swdenk			Default is 32bit.
1173c40b2956Swdenk
1174c609719bSwdenk- SCSI Support:
1175c609719bSwdenk		At the moment only there is only support for the
1176c609719bSwdenk		SYM53C8XX SCSI controller; define
1177c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1178c609719bSwdenk
11796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
11806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
11816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1182c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1183c609719bSwdenk		devices.
11846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1185c609719bSwdenk
1186447c031bSStefan Reinauer		The environment variable 'scsidevs' is set to the number of
1187447c031bSStefan Reinauer		SCSI devices found during the last scan.
1188447c031bSStefan Reinauer
1189c609719bSwdenk- NETWORK Support (PCI):
1190682011ffSwdenk		CONFIG_E1000
1191ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1192ce5207e1SKyle Moffett
1193ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1194ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1195ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1196ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1197ce5207e1SKyle Moffett
1198ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1199ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1200ce5207e1SKyle Moffett		example with the "sspi" command.
1201ce5207e1SKyle Moffett
1202ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1203ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1204ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1205682011ffSwdenk
1206ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
120711ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1208ac3315c2SAndre Schwarz
1209c609719bSwdenk		CONFIG_EEPRO100
1210c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
121111ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1212c609719bSwdenk		write routine for first time initialisation.
1213c609719bSwdenk
1214c609719bSwdenk		CONFIG_TULIP
1215c609719bSwdenk		Support for Digital 2114x chips.
1216c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1217c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1218c609719bSwdenk
1219c609719bSwdenk		CONFIG_NATSEMI
1220c609719bSwdenk		Support for National dp83815 chips.
1221c609719bSwdenk
1222c609719bSwdenk		CONFIG_NS8382X
1223c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1224c609719bSwdenk
122545219c46Swdenk- NETWORK Support (other):
122645219c46Swdenk
1227c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1228c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1229c041e9d2SJens Scharsig
1230c041e9d2SJens Scharsig			CONFIG_RMII
1231c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1232c041e9d2SJens Scharsig
1233c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1234c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1235c041e9d2SJens Scharsig			The driver doen't show link status messages.
1236c041e9d2SJens Scharsig
1237efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1238efdd7319SRob Herring		Support for the Calxeda XGMAC device
1239efdd7319SRob Herring
12403bb46d23SAshok		CONFIG_LAN91C96
124145219c46Swdenk		Support for SMSC's LAN91C96 chips.
124245219c46Swdenk
124345219c46Swdenk			CONFIG_LAN91C96_BASE
124445219c46Swdenk			Define this to hold the physical address
124545219c46Swdenk			of the LAN91C96's I/O space
124645219c46Swdenk
124745219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
124845219c46Swdenk			Define this to enable 32 bit addressing
124945219c46Swdenk
12503bb46d23SAshok		CONFIG_SMC91111
1251f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1252f39748aeSwdenk
1253f39748aeSwdenk			CONFIG_SMC91111_BASE
1254f39748aeSwdenk			Define this to hold the physical address
1255f39748aeSwdenk			of the device (I/O space)
1256f39748aeSwdenk
1257f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1258f39748aeSwdenk			Define this if data bus is 32 bits
1259f39748aeSwdenk
1260f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1261f39748aeSwdenk			Define this to use i/o functions instead of macros
1262f39748aeSwdenk			(some hardware wont work with macros)
1263f39748aeSwdenk
1264dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1265dc02badaSHeiko Schocher		Support for davinci emac
1266dc02badaSHeiko Schocher
1267dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1268dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1269dc02badaSHeiko Schocher
1270b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1271b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1272b3dbf4a5SMacpaul Lin
1273b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1274b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1275b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1276b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1277b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1278b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1279b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1280b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1281b3dbf4a5SMacpaul Lin
1282c2fff331SMike Rapoport		CONFIG_SMC911X
1283557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1284557b377dSJens Gehrlein
1285c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1286557b377dSJens Gehrlein			Define this to hold the physical address
1287557b377dSJens Gehrlein			of the device (I/O space)
1288557b377dSJens Gehrlein
1289c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1290557b377dSJens Gehrlein			Define this if data bus is 32 bits
1291557b377dSJens Gehrlein
1292c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1293557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1294557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1295c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1296557b377dSJens Gehrlein
12973d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
12983d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
12993d0075faSYoshihiro Shimoda
13003d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
13013d0075faSYoshihiro Shimoda			Define the number of ports to be used
13023d0075faSYoshihiro Shimoda
13033d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
13043d0075faSYoshihiro Shimoda			Define the ETH PHY's address
13053d0075faSYoshihiro Shimoda
130668260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
130768260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
130868260aabSYoshihiro Shimoda
13095e124724SVadim Bendebury- TPM Support:
131090899cc0SChe-liang Chiou		CONFIG_TPM
131190899cc0SChe-liang Chiou		Support TPM devices.
131290899cc0SChe-liang Chiou
13131b393db5STom Wai-Hong Tam		CONFIG_TPM_TIS_I2C
13141b393db5STom Wai-Hong Tam		Support for i2c bus TPM devices. Only one device
13151b393db5STom Wai-Hong Tam		per system is supported at this time.
13161b393db5STom Wai-Hong Tam
13171b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BUS_NUMBER
13181b393db5STom Wai-Hong Tam			Define the the i2c bus number for the TPM device
13191b393db5STom Wai-Hong Tam
13201b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
13211b393db5STom Wai-Hong Tam			Define the TPM's address on the i2c bus
13221b393db5STom Wai-Hong Tam
13231b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BURST_LIMITATION
13241b393db5STom Wai-Hong Tam			Define the burst count bytes upper limit
13251b393db5STom Wai-Hong Tam
1326c01939c7SDirk Eibach		CONFIG_TPM_ATMEL_TWI
1327c01939c7SDirk Eibach		Support for Atmel TWI TPM device. Requires I2C support.
1328c01939c7SDirk Eibach
132990899cc0SChe-liang Chiou		CONFIG_TPM_TIS_LPC
13305e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
13315e124724SVadim Bendebury		per system is supported at this time.
13325e124724SVadim Bendebury
13335e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
13345e124724SVadim Bendebury			Base address where the generic TPM device is mapped
13355e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
13365e124724SVadim Bendebury			0xfed40000.
13375e124724SVadim Bendebury
1338be6c1529SReinhard Pfau		CONFIG_CMD_TPM
1339be6c1529SReinhard Pfau		Add tpm monitor functions.
1340be6c1529SReinhard Pfau		Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
1341be6c1529SReinhard Pfau		provides monitor access to authorized functions.
1342be6c1529SReinhard Pfau
1343be6c1529SReinhard Pfau		CONFIG_TPM
1344be6c1529SReinhard Pfau		Define this to enable the TPM support library which provides
1345be6c1529SReinhard Pfau		functional interfaces to some TPM commands.
1346be6c1529SReinhard Pfau		Requires support for a TPM device.
1347be6c1529SReinhard Pfau
1348be6c1529SReinhard Pfau		CONFIG_TPM_AUTH_SESSIONS
1349be6c1529SReinhard Pfau		Define this to enable authorized functions in the TPM library.
1350be6c1529SReinhard Pfau		Requires CONFIG_TPM and CONFIG_SHA1.
1351be6c1529SReinhard Pfau
1352c609719bSwdenk- USB Support:
1353c609719bSwdenk		At the moment only the UHCI host controller is
13544d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1355c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1356c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
135730d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1358c609719bSwdenk		storage devices.
1359c609719bSwdenk		Note:
1360c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1361c609719bSwdenk		(TEAC FD-05PUB).
13624d13cbadSwdenk		MPC5200 USB requires additional defines:
13634d13cbadSwdenk			CONFIG_USB_CLOCK
13644d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1365307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1366307ecb6dSEric Millbrandt				for USB on PSC3
13674d13cbadSwdenk			CONFIG_USB_CONFIG
13684d13cbadSwdenk				for differential drivers: 0x00001000
13694d13cbadSwdenk				for single ended drivers: 0x00005000
1370307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1371307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
13726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1373fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1374fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
13754d13cbadSwdenk
13769ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
13779ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
13789ab4ce22SSimon Glass
1379aa155058SKuo-Jung Su		CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
1380aa155058SKuo-Jung Su		interval for usb hub power-on delay.(minimum 100msec)
1381aa155058SKuo-Jung Su
138216c8d5e7SWolfgang Denk- USB Device:
138316c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
138416c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
138516c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
138611ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
138716c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
138816c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
138916c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
139016c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
139116c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
139216c8d5e7SWolfgang Denk		a Linux host by
139316c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
139416c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
139516c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
139616c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
139716c8d5e7SWolfgang Denk
139816c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
139916c8d5e7SWolfgang Denk			Define this to build a UDC device
140016c8d5e7SWolfgang Denk
140116c8d5e7SWolfgang Denk			CONFIG_USB_TTY
140216c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
140316c8d5e7SWolfgang Denk			talk to the UDC device
140416c8d5e7SWolfgang Denk
1405f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1406f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1407f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1408f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1409f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1410f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1411f9da0f89SVipin KUMAR			speed.
1412f9da0f89SVipin KUMAR
14136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
141416c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
141516c8d5e7SWolfgang Denk			be set to usbtty.
141616c8d5e7SWolfgang Denk
141716c8d5e7SWolfgang Denk			mpc8xx:
14186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
141916c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
14206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
142116c8d5e7SWolfgang Denk
14226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
142316c8d5e7SWolfgang Denk				Derive USB clock from brgclk
14246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
142516c8d5e7SWolfgang Denk
142616c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
142716c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
142816c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
142916c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
143016c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
143116c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
143216c8d5e7SWolfgang Denk
143316c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
143416c8d5e7SWolfgang Denk			Define this string as the name of your company for
143516c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
143616c8d5e7SWolfgang Denk
143716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
143816c8d5e7SWolfgang Denk			Define this string as the name of your product
143916c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
144016c8d5e7SWolfgang Denk
144116c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
144216c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
144316c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
144416c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
144516c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
144616c8d5e7SWolfgang Denk
144716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
144816c8d5e7SWolfgang Denk			Define this as the unique Product ID
144916c8d5e7SWolfgang Denk			for your device
145016c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1451c609719bSwdenk
1452351e9b20SPrzemyslaw Marczak		Some USB device drivers may need to check USB cable attachment.
1453351e9b20SPrzemyslaw Marczak		In this case you can enable following config in BoardName.h:
1454351e9b20SPrzemyslaw Marczak			CONFIG_USB_CABLE_CHECK
1455351e9b20SPrzemyslaw Marczak			This enables function definition:
1456351e9b20SPrzemyslaw Marczak			- usb_cable_connected() in include/usb.h
1457351e9b20SPrzemyslaw Marczak			Implementation of this function is board-specific.
1458351e9b20SPrzemyslaw Marczak
1459d70a560fSIgor Grinberg- ULPI Layer Support:
1460d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1461d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1462d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1463d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1464d70a560fSIgor Grinberg		viewport is supported.
1465d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1466d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
14676d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
14686d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
14696d365ea0SLucas Stach		the appropriate value in Hz.
1470c609719bSwdenk
1471c609719bSwdenk- MMC Support:
1472c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1473c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1474c609719bSwdenk		accessed from the boot prompt by mapping the device
1475c609719bSwdenk		to physical memory similar to flash. Command line is
1476602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1477602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1478c609719bSwdenk
1479afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1480afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1481afb35666SYoshihiro Shimoda
1482afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1483afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1484afb35666SYoshihiro Shimoda
1485afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1486afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1487afb35666SYoshihiro Shimoda
1488b3ba6e94STom Rini- USB Device Firmware Update (DFU) class support:
1489b3ba6e94STom Rini		CONFIG_DFU_FUNCTION
1490b3ba6e94STom Rini		This enables the USB portion of the DFU USB class
1491b3ba6e94STom Rini
1492b3ba6e94STom Rini		CONFIG_CMD_DFU
1493b3ba6e94STom Rini		This enables the command "dfu" which is used to have
1494b3ba6e94STom Rini		U-Boot create a DFU class device via USB.  This command
1495b3ba6e94STom Rini		requires that the "dfu_alt_info" environment variable be
1496b3ba6e94STom Rini		set and define the alt settings to expose to the host.
1497b3ba6e94STom Rini
1498b3ba6e94STom Rini		CONFIG_DFU_MMC
1499b3ba6e94STom Rini		This enables support for exposing (e)MMC devices via DFU.
1500b3ba6e94STom Rini
1501c6631764SPantelis Antoniou		CONFIG_DFU_NAND
1502c6631764SPantelis Antoniou		This enables support for exposing NAND devices via DFU.
1503c6631764SPantelis Antoniou
1504a9479f04SAfzal Mohammed		CONFIG_DFU_RAM
1505a9479f04SAfzal Mohammed		This enables support for exposing RAM via DFU.
1506a9479f04SAfzal Mohammed		Note: DFU spec refer to non-volatile memory usage, but
1507a9479f04SAfzal Mohammed		allow usages beyond the scope of spec - here RAM usage,
1508a9479f04SAfzal Mohammed		one that would help mostly the developer.
1509a9479f04SAfzal Mohammed
1510e7e75c70SHeiko Schocher		CONFIG_SYS_DFU_DATA_BUF_SIZE
1511e7e75c70SHeiko Schocher		Dfu transfer uses a buffer before writing data to the
1512e7e75c70SHeiko Schocher		raw storage device. Make the size (in bytes) of this buffer
1513e7e75c70SHeiko Schocher		configurable. The size of this buffer is also configurable
1514e7e75c70SHeiko Schocher		through the "dfu_bufsiz" environment variable.
1515e7e75c70SHeiko Schocher
1516ea2453d5SPantelis Antoniou		CONFIG_SYS_DFU_MAX_FILE_SIZE
1517ea2453d5SPantelis Antoniou		When updating files rather than the raw storage device,
1518ea2453d5SPantelis Antoniou		we use a static buffer to copy the file into and then write
1519ea2453d5SPantelis Antoniou		the buffer once we've been given the whole file.  Define
1520ea2453d5SPantelis Antoniou		this to the maximum filesize (in bytes) for the buffer.
1521ea2453d5SPantelis Antoniou		Default is 4 MiB if undefined.
1522ea2453d5SPantelis Antoniou
15236705d81eSwdenk- Journaling Flash filesystem support:
15246705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
15256705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
15266705d81eSwdenk		Define these for a default partition on a NAND device
15276705d81eSwdenk
15286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
15296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
15306705d81eSwdenk		Define these for a default partition on a NOR device
15316705d81eSwdenk
15326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
15336705d81eSwdenk		Define this to create an own partition. You have to provide a
15346705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
15356705d81eSwdenk
15366705d81eSwdenk		If you define only one JFFS2 partition you may also want to
15376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
15386705d81eSwdenk		to disable the command chpart. This is the default when you
15396705d81eSwdenk		have not defined a custom partition
15406705d81eSwdenk
1541c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1542c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1543656f4c65SDonggeun Kim
1544656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1545656f4c65SDonggeun Kim		file in FAT formatted partition.
1546656f4c65SDonggeun Kim
1547656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1548656f4c65SDonggeun Kim		user to write files to FAT.
1549c30a15e5SDonggeun Kim
155084cd9327SGabe BlackCBFS (Coreboot Filesystem) support
155184cd9327SGabe Black		CONFIG_CMD_CBFS
155284cd9327SGabe Black
155384cd9327SGabe Black		Define this to enable support for reading from a Coreboot
155484cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
155584cd9327SGabe Black		and cbfsload.
155684cd9327SGabe Black
1557c609719bSwdenk- Keyboard Support:
1558c609719bSwdenk		CONFIG_ISA_KEYBOARD
1559c609719bSwdenk
1560c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1561c609719bSwdenk		support
1562c609719bSwdenk
1563c609719bSwdenk		CONFIG_I8042_KBD
1564c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1565c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1566c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1567c609719bSwdenk		for cfb_console. Supports cursor blinking.
1568c609719bSwdenk
1569713cb680SHung-ying Tyan		CONFIG_CROS_EC_KEYB
1570713cb680SHung-ying Tyan		Enables a Chrome OS keyboard using the CROS_EC interface.
1571713cb680SHung-ying Tyan		This uses CROS_EC to communicate with a second microcontroller
1572713cb680SHung-ying Tyan		which provides key scans on request.
1573713cb680SHung-ying Tyan
1574c609719bSwdenk- Video support:
1575c609719bSwdenk		CONFIG_VIDEO
1576c609719bSwdenk
1577c609719bSwdenk		Define this to enable video support (for output to
1578c609719bSwdenk		video).
1579c609719bSwdenk
1580c609719bSwdenk		CONFIG_VIDEO_CT69000
1581c609719bSwdenk
1582c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1583c609719bSwdenk
1584c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1585eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1586eeb1b77bSwdenk		video output is selected via environment 'videoout'
1587eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1588eeb1b77bSwdenk		assumed.
1589c609719bSwdenk
1590eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
159111ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1592eeb1b77bSwdenk		are possible:
1593eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1594eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1595eeb1b77bSwdenk
1596eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1597eeb1b77bSwdenk		-------------+---------------------------------------------
1598eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1599eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1600eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1601eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1602eeb1b77bSwdenk		-------------+---------------------------------------------
1603c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1604c609719bSwdenk
1605eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
16067817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1607eeb1b77bSwdenk
1608eeb1b77bSwdenk
1609a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1610a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1611a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1612a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1613a6c7ad2fSwdenk
16147d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
16157d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
16167d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
16177d3053fbSTimur Tabi		support, and should also define these other macros:
16187d3053fbSTimur Tabi
16197d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
16207d3053fbSTimur Tabi			CONFIG_VIDEO
16217d3053fbSTimur Tabi			CONFIG_CMD_BMP
16227d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
16237d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
16247d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
16257d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
16267d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
16277d3053fbSTimur Tabi
1628ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1629ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1630ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1631ba8e76bdSTimur Tabi		description of this variable.
16327d3053fbSTimur Tabi
1633058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1634058d59b0SSimon Glass
1635058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1636058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1637058d59b0SSimon Glass		driver.
1638058d59b0SSimon Glass
1639058d59b0SSimon Glass
1640682011ffSwdenk- Keyboard Support:
1641682011ffSwdenk		CONFIG_KEYBOARD
1642682011ffSwdenk
1643682011ffSwdenk		Define this to enable a custom keyboard support.
1644682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1645682011ffSwdenk		defined in your board-specific files.
1646682011ffSwdenk		The only board using this so far is RBC823.
1647a6c7ad2fSwdenk
1648c609719bSwdenk- LCD Support:	CONFIG_LCD
1649c609719bSwdenk
1650c609719bSwdenk		Define this to enable LCD support (for output to LCD
1651c609719bSwdenk		display); also select one of the supported displays
1652c609719bSwdenk		by defining one of these:
1653c609719bSwdenk
165439cf4804SStelian Pop		CONFIG_ATMEL_LCD:
165539cf4804SStelian Pop
165639cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
165739cf4804SStelian Pop
1658fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1659c609719bSwdenk
1660fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1661c609719bSwdenk
1662fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1663c609719bSwdenk
1664fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1665fd3103bbSwdenk			Active, color, single scan.
1666fd3103bbSwdenk
1667fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1668fd3103bbSwdenk
1669fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1670c609719bSwdenk			Active, color, single scan.
1671c609719bSwdenk
1672c609719bSwdenk		CONFIG_SHARP_16x9
1673c609719bSwdenk
1674c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1675c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1676c609719bSwdenk
1677c609719bSwdenk		CONFIG_SHARP_LQ64D341
1678c609719bSwdenk
1679c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1680c609719bSwdenk			Active, color, single scan.
1681c609719bSwdenk
1682c609719bSwdenk		CONFIG_HLD1045
1683c609719bSwdenk
1684c609719bSwdenk			HLD1045 display, 640x480.
1685c609719bSwdenk			Active, color, single scan.
1686c609719bSwdenk
1687c609719bSwdenk		CONFIG_OPTREX_BW
1688c609719bSwdenk
1689c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1690c609719bSwdenk			or
1691c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1692c609719bSwdenk			or
1693c609719bSwdenk			Hitachi	 SP14Q002
1694c609719bSwdenk
1695c609719bSwdenk			320x240. Black & white.
1696c609719bSwdenk
1697c609719bSwdenk		Normally display is black on white background; define
16986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1699c609719bSwdenk
1700676d319eSSimon Glass		CONFIG_LCD_ALIGNMENT
1701676d319eSSimon Glass
1702676d319eSSimon Glass		Normally the LCD is page-aligned (tyically 4KB). If this is
1703676d319eSSimon Glass		defined then the LCD will be aligned to this value instead.
1704676d319eSSimon Glass		For ARM it is sometimes useful to use MMU_SECTION_SIZE
1705676d319eSSimon Glass		here, since it is cheaper to change data cache settings on
1706676d319eSSimon Glass		a per-section basis.
1707676d319eSSimon Glass
17080d89efefSSimon Glass		CONFIG_CONSOLE_SCROLL_LINES
17090d89efefSSimon Glass
17100d89efefSSimon Glass		When the console need to be scrolled, this is the number of
17110d89efefSSimon Glass		lines to scroll by. It defaults to 1. Increasing this makes
17120d89efefSSimon Glass		the console jump but can help speed up operation when scrolling
17130d89efefSSimon Glass		is slow.
1714676d319eSSimon Glass
171545d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
171645d7f525STom Wai-Hong Tam
171745d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
171845d7f525STom Wai-Hong Tam
1719735987c5STom Wai-Hong Tam		CONFIG_I2C_EDID
1720735987c5STom Wai-Hong Tam
1721735987c5STom Wai-Hong Tam		Enables an 'i2c edid' command which can read EDID
1722735987c5STom Wai-Hong Tam		information over I2C from an attached LCD display.
1723735987c5STom Wai-Hong Tam
17247152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1725d791b1dcSwdenk
1726d791b1dcSwdenk		If this option is set, the environment is checked for
1727d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1728d791b1dcSwdenk		of logo, copyright and system information on the LCD
1729e94d2cd9Swdenk		is suppressed and the BMP image at the address
1730d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1731d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1732d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1733d791b1dcSwdenk		loaded very quickly after power-on.
1734d791b1dcSwdenk
1735c0880485SNikita Kiryanov		CONFIG_SPLASHIMAGE_GUARD
1736c0880485SNikita Kiryanov
1737c0880485SNikita Kiryanov		If this option is set, then U-Boot will prevent the environment
1738c0880485SNikita Kiryanov		variable "splashimage" from being set to a problematic address
1739c0880485SNikita Kiryanov		(see README.displaying-bmps and README.arm-unaligned-accesses).
1740c0880485SNikita Kiryanov		This option is useful for targets where, due to alignment
1741c0880485SNikita Kiryanov		restrictions, an improperly aligned BMP image will cause a data
1742c0880485SNikita Kiryanov		abort. If you think you will not have problems with unaligned
1743c0880485SNikita Kiryanov		accesses (for example because your toolchain prevents them)
1744c0880485SNikita Kiryanov		there is no need to set this option.
1745c0880485SNikita Kiryanov
17461ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
17471ca298ceSMatthias Weisser
17481ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
17491ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
17501ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
17511ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
17521ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
17531ca298ceSMatthias Weisser		specify 'm' for centering the image.
17541ca298ceSMatthias Weisser
17551ca298ceSMatthias Weisser		Example:
17561ca298ceSMatthias Weisser		setenv splashpos m,m
17571ca298ceSMatthias Weisser			=> image at center of screen
17581ca298ceSMatthias Weisser
17591ca298ceSMatthias Weisser		setenv splashpos 30,20
17601ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
17611ca298ceSMatthias Weisser
17621ca298ceSMatthias Weisser		setenv splashpos -10,m
17631ca298ceSMatthias Weisser			=> vertically centered image
17641ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
17651ca298ceSMatthias Weisser
176698f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
176798f4a3dfSStefan Roese
176898f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
176998f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
177098f4a3dfSStefan Roese		splashscreen support or the bmp command.
177198f4a3dfSStefan Roese
1772d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1773d5011762SAnatolij Gustschin
1774d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1775d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1776d5011762SAnatolij Gustschin		bmp command.
1777d5011762SAnatolij Gustschin
1778f2b96dfbSLei Wen- Do compresssing for memory range:
1779f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1780f2b96dfbSLei Wen
1781f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1782f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1783f2b96dfbSLei Wen
1784c29fdfc1Swdenk- Compression support:
17858ef70478SKees Cook		CONFIG_GZIP
17868ef70478SKees Cook
17878ef70478SKees Cook		Enabled by default to support gzip compressed images.
17888ef70478SKees Cook
1789c29fdfc1Swdenk		CONFIG_BZIP2
1790c29fdfc1Swdenk
1791c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1792c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1793c29fdfc1Swdenk		compressed images are supported.
1794c29fdfc1Swdenk
1795c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
17966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1797c29fdfc1Swdenk		be at least 4MB.
1798d791b1dcSwdenk
1799fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1800fc9c1727SLuigi 'Comio' Mantellini
1801fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1802fc9c1727SLuigi 'Comio' Mantellini		images is included.
1803fc9c1727SLuigi 'Comio' Mantellini
1804fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1805fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1806fc9c1727SLuigi 'Comio' Mantellini		formula:
1807fc9c1727SLuigi 'Comio' Mantellini
1808fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1809fc9c1727SLuigi 'Comio' Mantellini
1810fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1811fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1812fc9c1727SLuigi 'Comio' Mantellini
1813fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1814fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1815fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1816fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1817fc9c1727SLuigi 'Comio' Mantellini
1818fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1819fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
18206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1821fc9c1727SLuigi 'Comio' Mantellini
18228ef70478SKees Cook		CONFIG_LZO
18238ef70478SKees Cook
18248ef70478SKees Cook		If this option is set, support for LZO compressed images
18258ef70478SKees Cook		is included.
18268ef70478SKees Cook
182717ea1177Swdenk- MII/PHY support:
182817ea1177Swdenk		CONFIG_PHY_ADDR
182917ea1177Swdenk
183017ea1177Swdenk		The address of PHY on MII bus.
183117ea1177Swdenk
183217ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
183317ea1177Swdenk
183417ea1177Swdenk		The clock frequency of the MII bus
183517ea1177Swdenk
183617ea1177Swdenk		CONFIG_PHY_GIGE
183717ea1177Swdenk
183817ea1177Swdenk		If this option is set, support for speed/duplex
183911ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
184017ea1177Swdenk
184117ea1177Swdenk		CONFIG_PHY_RESET_DELAY
184217ea1177Swdenk
184317ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
184417ea1177Swdenk		reset before any MII register access is possible.
184517ea1177Swdenk		For such PHY, set this option to the usec delay
184617ea1177Swdenk		required. (minimum 300usec for LXT971A)
184717ea1177Swdenk
184817ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
184917ea1177Swdenk
185017ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
185117ea1177Swdenk		command issued before MII status register can be read
185217ea1177Swdenk
1853c609719bSwdenk- Ethernet address:
1854c609719bSwdenk		CONFIG_ETHADDR
1855c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1856c609719bSwdenk		CONFIG_ETH2ADDR
1857c609719bSwdenk		CONFIG_ETH3ADDR
1858c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1859c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1860c609719bSwdenk
186111ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
186211ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1863c609719bSwdenk		is not determined automatically.
1864c609719bSwdenk
1865c609719bSwdenk- IP address:
1866c609719bSwdenk		CONFIG_IPADDR
1867c609719bSwdenk
1868c609719bSwdenk		Define a default value for the IP address to use for
186911ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1870c609719bSwdenk		determined through e.g. bootp.
18711ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1872c609719bSwdenk
1873c609719bSwdenk- Server IP address:
1874c609719bSwdenk		CONFIG_SERVERIP
1875c609719bSwdenk
1876c609719bSwdenk		Defines a default value for the IP address of a TFTP
1877c609719bSwdenk		server to contact when using the "tftboot" command.
18781ebcd654SWolfgang Denk		(Environment variable "serverip")
1879c609719bSwdenk
188097cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
188197cfe861SRobin Getz
188297cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
188397cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
188497cfe861SRobin Getz
18851ebcd654SWolfgang Denk- Gateway IP address:
18861ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
18871ebcd654SWolfgang Denk
18881ebcd654SWolfgang Denk		Defines a default value for the IP address of the
18891ebcd654SWolfgang Denk		default router where packets to other networks are
18901ebcd654SWolfgang Denk		sent to.
18911ebcd654SWolfgang Denk		(Environment variable "gatewayip")
18921ebcd654SWolfgang Denk
18931ebcd654SWolfgang Denk- Subnet mask:
18941ebcd654SWolfgang Denk		CONFIG_NETMASK
18951ebcd654SWolfgang Denk
18961ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
18971ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
18981ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
18991ebcd654SWolfgang Denk		forwarded through a router.
19001ebcd654SWolfgang Denk		(Environment variable "netmask")
19011ebcd654SWolfgang Denk
190253a5c424SDavid Updegraff- Multicast TFTP Mode:
190353a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
190453a5c424SDavid Updegraff
190553a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
190653a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
190711ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
190853a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
190953a5c424SDavid Updegraff		multicast group.
191053a5c424SDavid Updegraff
1911c609719bSwdenk- BOOTP Recovery Mode:
1912c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1913c609719bSwdenk
1914c609719bSwdenk		If you have many targets in a network that try to
1915c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1916c609719bSwdenk		systems send out BOOTP requests at precisely the same
1917c609719bSwdenk		moment (which would happen for instance at recovery
1918c609719bSwdenk		from a power failure, when all systems will try to
1919c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1920c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1921c609719bSwdenk		inserted before sending out BOOTP requests. The
19226c33c785SWolfgang Denk		following delays are inserted then:
1923c609719bSwdenk
1924c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1925c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1926c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1927c609719bSwdenk		4th and following
1928c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1929c609719bSwdenk
1930fe389a82Sstroese- DHCP Advanced Options:
19311fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
19321fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1933fe389a82Sstroese
19341fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
19351fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
19361fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
19371fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
19381fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
19391fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
19401fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
19411fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
19421fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
19431fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
19441fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
19451fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
19462c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1947fe389a82Sstroese
19485d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
19495d110f0aSWilson Callan		environment variable, not the BOOTP server.
1950fe389a82Sstroese
19512c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
19522c00e099SJoe Hershberger		after the configured retry count, the call will fail
19532c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
19542c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
19552c00e099SJoe Hershberger		is not available.
19562c00e099SJoe Hershberger
1957fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1958fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1959fe389a82Sstroese		than one DNS serverip is offered to the client.
1960fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1961fe389a82Sstroese		serverip will be stored in the additional environment
1962fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1963fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
19641fe80d79SJon Loeliger		is defined.
1965fe389a82Sstroese
1966fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1967fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1968fe389a82Sstroese		need the hostname of the DHCP requester.
19695d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
19701fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
19711fe80d79SJon Loeliger		option 12 to the DHCP server.
1972fe389a82Sstroese
1973d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1974d9a2f416SAras Vaichas
1975d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1976d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1977d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1978d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1979d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1980d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1981d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1982d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1983d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1984d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1985d9a2f416SAras Vaichas		this delay.
1986d9a2f416SAras Vaichas
1987d22c338eSJoe Hershberger - Link-local IP address negotiation:
1988d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1989d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1990d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1991d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1992d22c338eSJoe Hershberger
1993d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1994d22c338eSJoe Hershberger
1995a3d991bdSwdenk - CDP Options:
1996a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1997a3d991bdSwdenk
1998a3d991bdSwdenk		The device id used in CDP trigger frames.
1999a3d991bdSwdenk
2000a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
2001a3d991bdSwdenk
2002a3d991bdSwdenk		A two character string which is prefixed to the MAC address
2003a3d991bdSwdenk		of the device.
2004a3d991bdSwdenk
2005a3d991bdSwdenk		CONFIG_CDP_PORT_ID
2006a3d991bdSwdenk
2007a3d991bdSwdenk		A printf format string which contains the ascii name of
2008a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
200911ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
2010a3d991bdSwdenk
2011a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
2012a3d991bdSwdenk
2013a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
2014a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
2015a3d991bdSwdenk
2016a3d991bdSwdenk		CONFIG_CDP_VERSION
2017a3d991bdSwdenk
2018a3d991bdSwdenk		An ascii string containing the version of the software.
2019a3d991bdSwdenk
2020a3d991bdSwdenk		CONFIG_CDP_PLATFORM
2021a3d991bdSwdenk
2022a3d991bdSwdenk		An ascii string containing the name of the platform.
2023a3d991bdSwdenk
2024a3d991bdSwdenk		CONFIG_CDP_TRIGGER
2025a3d991bdSwdenk
2026a3d991bdSwdenk		A 32bit integer sent on the trigger.
2027a3d991bdSwdenk
2028a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
2029a3d991bdSwdenk
2030a3d991bdSwdenk		A 16bit integer containing the power consumption of the
2031a3d991bdSwdenk		device in .1 of milliwatts.
2032a3d991bdSwdenk
2033a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
2034a3d991bdSwdenk
2035a3d991bdSwdenk		A byte containing the id of the VLAN.
2036a3d991bdSwdenk
2037c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
2038c609719bSwdenk
2039c609719bSwdenk		Several configurations allow to display the current
2040c609719bSwdenk		status using a LED. For instance, the LED will blink
2041c609719bSwdenk		fast while running U-Boot code, stop blinking as
2042c609719bSwdenk		soon as a reply to a BOOTP request was received, and
2043c609719bSwdenk		start blinking slow once the Linux kernel is running
2044c609719bSwdenk		(supported by a status LED driver in the Linux
2045c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
2046c609719bSwdenk		feature in U-Boot.
2047c609719bSwdenk
20481df7bbbaSIgor Grinberg		Additional options:
20491df7bbbaSIgor Grinberg
20501df7bbbaSIgor Grinberg		CONFIG_GPIO_LED
20511df7bbbaSIgor Grinberg		The status LED can be connected to a GPIO pin.
20521df7bbbaSIgor Grinberg		In such cases, the gpio_led driver can be used as a
20531df7bbbaSIgor Grinberg		status LED backend implementation. Define CONFIG_GPIO_LED
20541df7bbbaSIgor Grinberg		to include the gpio_led driver in the U-Boot binary.
20551df7bbbaSIgor Grinberg
20569dfdcdfeSIgor Grinberg		CONFIG_GPIO_LED_INVERTED_TABLE
20579dfdcdfeSIgor Grinberg		Some GPIO connected LEDs may have inverted polarity in which
20589dfdcdfeSIgor Grinberg		case the GPIO high value corresponds to LED off state and
20599dfdcdfeSIgor Grinberg		GPIO low value corresponds to LED on state.
20609dfdcdfeSIgor Grinberg		In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined
20619dfdcdfeSIgor Grinberg		with a list of GPIO LEDs that have inverted polarity.
20629dfdcdfeSIgor Grinberg
2063c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
2064c609719bSwdenk
2065c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
2066c609719bSwdenk		on those systems that support this (optional)
2067c609719bSwdenk		feature, like the TQM8xxL modules.
2068c609719bSwdenk
20693f4978c7SHeiko Schocher- I2C Support:	CONFIG_SYS_I2C
2070c609719bSwdenk
20713f4978c7SHeiko Schocher		This enable the NEW i2c subsystem, and will allow you to use
20723f4978c7SHeiko Schocher		i2c commands at the u-boot command line (as long as you set
20733f4978c7SHeiko Schocher		CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
20743f4978c7SHeiko Schocher		based realtime clock chips or other i2c devices. See
20753f4978c7SHeiko Schocher		common/cmd_i2c.c for a description of the command line
20763f4978c7SHeiko Schocher		interface.
20773f4978c7SHeiko Schocher
20783f4978c7SHeiko Schocher		ported i2c driver to the new framework:
2079ea818dbbSHeiko Schocher		- drivers/i2c/soft_i2c.c:
2080ea818dbbSHeiko Schocher		  - activate first bus with CONFIG_SYS_I2C_SOFT define
2081ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
2082ea818dbbSHeiko Schocher		    for defining speed and slave address
2083ea818dbbSHeiko Schocher		  - activate second bus with I2C_SOFT_DECLARATIONS2 define
2084ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
2085ea818dbbSHeiko Schocher		    for defining speed and slave address
2086ea818dbbSHeiko Schocher		  - activate third bus with I2C_SOFT_DECLARATIONS3 define
2087ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
2088ea818dbbSHeiko Schocher		    for defining speed and slave address
2089ea818dbbSHeiko Schocher		  - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
2090ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
2091ea818dbbSHeiko Schocher		    for defining speed and slave address
20923f4978c7SHeiko Schocher
209300f792e0SHeiko Schocher		- drivers/i2c/fsl_i2c.c:
209400f792e0SHeiko Schocher		  - activate i2c driver with CONFIG_SYS_I2C_FSL
209500f792e0SHeiko Schocher		    define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
209600f792e0SHeiko Schocher		    offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
209700f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
209800f792e0SHeiko Schocher		    bus.
209900f792e0SHeiko Schocher		  - If your board supports a second fsl i2c bus, define
210000f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
210100f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SPEED for the speed and
210200f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
210300f792e0SHeiko Schocher		    second bus.
210400f792e0SHeiko Schocher
21051f2ba722SSimon Glass		- drivers/i2c/tegra_i2c.c:
21061f2ba722SSimon Glass		  - activate this driver with CONFIG_SYS_I2C_TEGRA
21071f2ba722SSimon Glass		  - This driver adds 4 i2c buses with a fix speed from
21081f2ba722SSimon Glass		    100000 and the slave addr 0!
21091f2ba722SSimon Glass
2110880540deSDirk Eibach		- drivers/i2c/ppc4xx_i2c.c
2111880540deSDirk Eibach		  - activate this driver with CONFIG_SYS_I2C_PPC4XX
2112880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
2113880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
2114880540deSDirk Eibach
2115fac96408Strem		- drivers/i2c/i2c_mxc.c
2116fac96408Strem		  - activate this driver with CONFIG_SYS_I2C_MXC
2117fac96408Strem		  - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED
2118fac96408Strem		  - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE
2119fac96408Strem		  - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED
2120fac96408Strem		  - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE
2121fac96408Strem		  - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED
2122fac96408Strem		  - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
2123fac96408Strem		If thoses defines are not set, default value is 100000
2124fac96408Strem		for speed, and 0 for slave.
2125fac96408Strem
21261086bfa9SNobuhiro Iwamatsu		- drivers/i2c/rcar_i2c.c:
21271086bfa9SNobuhiro Iwamatsu		  - activate this driver with CONFIG_SYS_I2C_RCAR
21281086bfa9SNobuhiro Iwamatsu		  - This driver adds 4 i2c buses
21291086bfa9SNobuhiro Iwamatsu
21301086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0
21311086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0
21321086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1
21331086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1
21341086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2
21351086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2
21361086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3
21371086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3
21381086bfa9SNobuhiro Iwamatsu		  - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses
21391086bfa9SNobuhiro Iwamatsu
21402035d77dSNobuhiro Iwamatsu		- drivers/i2c/sh_i2c.c:
21412035d77dSNobuhiro Iwamatsu		  - activate this driver with CONFIG_SYS_I2C_SH
21422035d77dSNobuhiro Iwamatsu		  - This driver adds from 2 to 5 i2c buses
21432035d77dSNobuhiro Iwamatsu
21442035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0
21452035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0
21462035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1
21472035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1
21482035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2
21492035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2
21502035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3
21512035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3
21522035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4
21532035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4
21542035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_BASE5 for setting the register channel 5
21552035d77dSNobuhiro Iwamatsu		  - CONFIG_SYS_I2C_SH_SPEED5 for for the speed channel 5
21562035d77dSNobuhiro Iwamatsu		  - CONFIF_SYS_I2C_SH_NUM_CONTROLLERS for nummber of i2c buses
21572035d77dSNobuhiro Iwamatsu
21586789e84eSHeiko Schocher		- drivers/i2c/omap24xx_i2c.c
21596789e84eSHeiko Schocher		  - activate this driver with CONFIG_SYS_I2C_OMAP24XX
21606789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0
21616789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0
21626789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1
21636789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1
21646789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2
21656789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2
21666789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3
21676789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3
21686789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4
21696789e84eSHeiko Schocher		  - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4
21706789e84eSHeiko Schocher
21710bdffe71SHeiko Schocher		- drivers/i2c/zynq_i2c.c
21720bdffe71SHeiko Schocher		  - activate this driver with CONFIG_SYS_I2C_ZYNQ
21730bdffe71SHeiko Schocher		  - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting
21740bdffe71SHeiko Schocher		  - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr
21750bdffe71SHeiko Schocher
2176e717fc6dSNaveen Krishna Ch		- drivers/i2c/s3c24x0_i2c.c:
2177e717fc6dSNaveen Krishna Ch		  - activate this driver with CONFIG_SYS_I2C_S3C24X0
2178e717fc6dSNaveen Krishna Ch		  - This driver adds i2c buses (11 for Exynos5250, Exynos5420
2179e717fc6dSNaveen Krishna Ch		    9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung)
2180e717fc6dSNaveen Krishna Ch		    with a fix speed from 100000 and the slave addr 0!
2181e717fc6dSNaveen Krishna Ch
21823f4978c7SHeiko Schocher		additional defines:
21833f4978c7SHeiko Schocher
21843f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES
21853f4978c7SHeiko Schocher		Hold the number of i2c busses you want to use. If you
21863f4978c7SHeiko Schocher		don't use/have i2c muxes on your i2c bus, this
21873f4978c7SHeiko Schocher		is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
21883f4978c7SHeiko Schocher		omit this define.
21893f4978c7SHeiko Schocher
21903f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS
21913f4978c7SHeiko Schocher		define this, if you don't use i2c muxes on your hardware.
21923f4978c7SHeiko Schocher		if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
21933f4978c7SHeiko Schocher		omit this define.
21943f4978c7SHeiko Schocher
21953f4978c7SHeiko Schocher		CONFIG_SYS_I2C_MAX_HOPS
21963f4978c7SHeiko Schocher		define how many muxes are maximal consecutively connected
21973f4978c7SHeiko Schocher		on one i2c bus. If you not use i2c muxes, omit this
21983f4978c7SHeiko Schocher		define.
21993f4978c7SHeiko Schocher
22003f4978c7SHeiko Schocher		CONFIG_SYS_I2C_BUSES
22013f4978c7SHeiko Schocher		hold a list of busses you want to use, only used if
22023f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
22033f4978c7SHeiko Schocher		a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
22043f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES = 9:
22053f4978c7SHeiko Schocher
22063f4978c7SHeiko Schocher		 CONFIG_SYS_I2C_BUSES	{{0, {I2C_NULL_HOP}}, \
22073f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
22083f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
22093f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
22103f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
22113f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
22123f4978c7SHeiko Schocher					{1, {I2C_NULL_HOP}}, \
22133f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
22143f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
22153f4978c7SHeiko Schocher					}
22163f4978c7SHeiko Schocher
22173f4978c7SHeiko Schocher		which defines
22183f4978c7SHeiko Schocher			bus 0 on adapter 0 without a mux
2219ea818dbbSHeiko Schocher			bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
2220ea818dbbSHeiko Schocher			bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
2221ea818dbbSHeiko Schocher			bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
2222ea818dbbSHeiko Schocher			bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
2223ea818dbbSHeiko Schocher			bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
22243f4978c7SHeiko Schocher			bus 6 on adapter 1 without a mux
2225ea818dbbSHeiko Schocher			bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
2226ea818dbbSHeiko Schocher			bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
22273f4978c7SHeiko Schocher
22283f4978c7SHeiko Schocher		If you do not have i2c muxes on your board, omit this define.
22293f4978c7SHeiko Schocher
2230ea818dbbSHeiko Schocher- Legacy I2C Support:	CONFIG_HARD_I2C
22313f4978c7SHeiko Schocher
22323f4978c7SHeiko Schocher		NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
22333f4978c7SHeiko Schocher		provides the following compelling advantages:
22343f4978c7SHeiko Schocher
22353f4978c7SHeiko Schocher		- more than one i2c adapter is usable
22363f4978c7SHeiko Schocher		- approved multibus support
22373f4978c7SHeiko Schocher		- better i2c mux support
22383f4978c7SHeiko Schocher
22393f4978c7SHeiko Schocher		** Please consider updating your I2C driver now. **
22403f4978c7SHeiko Schocher
2241ea818dbbSHeiko Schocher		These enable legacy I2C serial bus commands. Defining
2242ea818dbbSHeiko Schocher		CONFIG_HARD_I2C will include the appropriate I2C driver
2243ea818dbbSHeiko Schocher		for the selected CPU.
2244c609719bSwdenk
2245b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
2246602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
2247b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
2248b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
2249c609719bSwdenk		command line interface.
2250c609719bSwdenk
2251bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
2252c609719bSwdenk
2253b37c7e5eSwdenk		There are several other quantities that must also be
2254ea818dbbSHeiko Schocher		defined when you define CONFIG_HARD_I2C.
2255c609719bSwdenk
22566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
2257b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
22586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
225911ccc33fSMarcel Ziswiler		the CPU's i2c node address).
2260c609719bSwdenk
22618d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
2262a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
22638d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
22648d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
22658d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
2266b37c7e5eSwdenk
22675da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
22685da71efaSEric Millbrandt
22695da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
22705da71efaSEric Millbrandt		chips might think that the current transfer is still
22715da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
22725da71efaSEric Millbrandt		commands until the slave device responds.
22735da71efaSEric Millbrandt
2274b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
2275b37c7e5eSwdenk
2276ea818dbbSHeiko Schocher		If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
2277b37c7e5eSwdenk		then the following macros need to be defined (examples are
2278b37c7e5eSwdenk		from include/configs/lwmon.h):
2279c609719bSwdenk
2280c609719bSwdenk		I2C_INIT
2281c609719bSwdenk
2282b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
2283c609719bSwdenk		controller or configure ports.
2284c609719bSwdenk
2285b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
2286b37c7e5eSwdenk
2287c609719bSwdenk		I2C_PORT
2288c609719bSwdenk
2289c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
2290c609719bSwdenk		assumes both bits are on the same port). Valid values
2291c609719bSwdenk		are 0..3 for ports A..D.
2292c609719bSwdenk
2293c609719bSwdenk		I2C_ACTIVE
2294c609719bSwdenk
2295c609719bSwdenk		The code necessary to make the I2C data line active
2296c609719bSwdenk		(driven).  If the data line is open collector, this
2297c609719bSwdenk		define can be null.
2298c609719bSwdenk
2299b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
2300b37c7e5eSwdenk
2301c609719bSwdenk		I2C_TRISTATE
2302c609719bSwdenk
2303c609719bSwdenk		The code necessary to make the I2C data line tri-stated
2304c609719bSwdenk		(inactive).  If the data line is open collector, this
2305c609719bSwdenk		define can be null.
2306c609719bSwdenk
2307b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2308b37c7e5eSwdenk
2309c609719bSwdenk		I2C_READ
2310c609719bSwdenk
2311472d5460SYork Sun		Code that returns true if the I2C data line is high,
2312472d5460SYork Sun		false if it is low.
2313c609719bSwdenk
2314b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2315b37c7e5eSwdenk
2316c609719bSwdenk		I2C_SDA(bit)
2317c609719bSwdenk
2318472d5460SYork Sun		If <bit> is true, sets the I2C data line high. If it
2319472d5460SYork Sun		is false, it clears it (low).
2320c609719bSwdenk
2321b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
2322b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
2323b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
2324b37c7e5eSwdenk
2325c609719bSwdenk		I2C_SCL(bit)
2326c609719bSwdenk
2327472d5460SYork Sun		If <bit> is true, sets the I2C clock line high. If it
2328472d5460SYork Sun		is false, it clears it (low).
2329c609719bSwdenk
2330b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
2331b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
2332b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
2333b37c7e5eSwdenk
2334c609719bSwdenk		I2C_DELAY
2335c609719bSwdenk
2336c609719bSwdenk		This delay is invoked four times per clock cycle so this
2337c609719bSwdenk		controls the rate of data transfer.  The data rate thus
2338b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
2339b37c7e5eSwdenk		like:
2340b37c7e5eSwdenk
2341b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
2342c609719bSwdenk
2343793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2344793b5726SMike Frysinger
2345793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
2346793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
2347793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
2348793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
2349793b5726SMike Frysinger
2350793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
2351793b5726SMike Frysinger		the generic GPIO functions.
2352793b5726SMike Frysinger
23536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
235447cd00faSwdenk
235547cd00faSwdenk		When a board is reset during an i2c bus transfer
235647cd00faSwdenk		chips might think that the current transfer is still
235747cd00faSwdenk		in progress. On some boards it is possible to access
235847cd00faSwdenk		the i2c SCLK line directly, either by using the
235947cd00faSwdenk		processor pin as a GPIO or by having a second pin
236047cd00faSwdenk		connected to the bus. If this option is defined a
236147cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
236247cd00faSwdenk		is run early in the boot sequence.
236347cd00faSwdenk
236426a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
236526a33504SRichard Retanubun
236626a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
236726a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
236826a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
236926a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
237026a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
237126a33504SRichard Retanubun		controller provide such a method. It is called at the end of
237226a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
237326a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
237426a33504SRichard Retanubun
237517ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
237617ea1177Swdenk
237717ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
237817ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
237917ea1177Swdenk		variable "i2cfast". (see also i2cfast)
238017ea1177Swdenk
2381bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
2382bb99ad6dSBen Warren
2383bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
2384bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
2385bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
2386bb99ad6dSBen Warren		Note that bus numbering is zero-based.
2387bb99ad6dSBen Warren
23886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
2389bb99ad6dSBen Warren
2390bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
23910f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
23920f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
23930f89c54bSPeter Tyser		a 1D array of device addresses
2394bb99ad6dSBen Warren
2395bb99ad6dSBen Warren		e.g.
2396bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
23976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2398bb99ad6dSBen Warren
2399bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
2400bb99ad6dSBen Warren
2401bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
24026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
2403bb99ad6dSBen Warren
2404bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2405bb99ad6dSBen Warren
24066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
2407be5e6181STimur Tabi
2408be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
2409be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2410be5e6181STimur Tabi
24116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
24120dc018ecSStefan Roese
24130dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
24140dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
24150dc018ecSStefan Roese
24166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
24170dc018ecSStefan Roese
24180dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
24190dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
24200dc018ecSStefan Roese
24216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
24229ebbb54fSVictor Gallardo
24239ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
24249ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
24259ebbb54fSVictor Gallardo		specified DTT device.
24269ebbb54fSVictor Gallardo
24272ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
24282ac6985aSAndrew Dyer
24292ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
24302ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
24312ac6985aSAndrew Dyer		between writing the address pointer and reading the
24322ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
24332ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
24342ac6985aSAndrew Dyer		devices can use either method, but some require one or
24352ac6985aSAndrew Dyer		the other.
2436be5e6181STimur Tabi
2437c609719bSwdenk- SPI Support:	CONFIG_SPI
2438c609719bSwdenk
2439c609719bSwdenk		Enables SPI driver (so far only tested with
2440c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2441c609719bSwdenk		D/As on the SACSng board)
2442c609719bSwdenk
24436639562eSYoshihiro Shimoda		CONFIG_SH_SPI
24446639562eSYoshihiro Shimoda
24456639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
24466639562eSYoshihiro Shimoda		only SH7757 is supported.
24476639562eSYoshihiro Shimoda
2448c609719bSwdenk		CONFIG_SPI_X
2449c609719bSwdenk
2450c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2451c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2452c609719bSwdenk
2453c609719bSwdenk		CONFIG_SOFT_SPI
2454c609719bSwdenk
2455c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2456c609719bSwdenk		using hardware support. This is a general purpose
2457c609719bSwdenk		driver that only requires three general I/O port pins
2458c609719bSwdenk		(two outputs, one input) to function. If this is
2459c609719bSwdenk		defined, the board configuration must define several
2460c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2461c609719bSwdenk		an example, see include/configs/sacsng.h.
2462c609719bSwdenk
246304a9e118SBen Warren		CONFIG_HARD_SPI
246404a9e118SBen Warren
246504a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
246604a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
246704a9e118SBen Warren		must define a list of chip-select function pointers.
246804a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
246904a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
247004a9e118SBen Warren
247138254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
247238254f45SGuennadi Liakhovetski
247338254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
24742e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
247538254f45SGuennadi Liakhovetski
24760133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
24770133502eSMatthias Fuchs
24780133502eSMatthias Fuchs		Enables FPGA subsystem.
24790133502eSMatthias Fuchs
24800133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
24810133502eSMatthias Fuchs
24820133502eSMatthias Fuchs		Enables support for specific chip vendors.
24830133502eSMatthias Fuchs		(ALTERA, XILINX)
24840133502eSMatthias Fuchs
24850133502eSMatthias Fuchs		CONFIG_FPGA_<family>
24860133502eSMatthias Fuchs
24870133502eSMatthias Fuchs		Enables support for FPGA family.
24880133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
24890133502eSMatthias Fuchs
24900133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2491c609719bSwdenk
2492c609719bSwdenk		Specify the number of FPGA devices to support.
2493c609719bSwdenk
24946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2495c609719bSwdenk
2496c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2497c609719bSwdenk
24986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2499c609719bSwdenk
2500c609719bSwdenk		Enable checks on FPGA configuration interface busy
2501c609719bSwdenk		status by the configuration function. This option
2502c609719bSwdenk		will require a board or device specific function to
2503c609719bSwdenk		be written.
2504c609719bSwdenk
2505c609719bSwdenk		CONFIG_FPGA_DELAY
2506c609719bSwdenk
2507c609719bSwdenk		If defined, a function that provides delays in the FPGA
2508c609719bSwdenk		configuration driver.
2509c609719bSwdenk
25106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2511c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2512c609719bSwdenk
25136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2514c609719bSwdenk
2515c609719bSwdenk		Check for configuration errors during FPGA bitfile
2516c609719bSwdenk		loading. For example, abort during Virtex II
2517c609719bSwdenk		configuration if the INIT_B line goes low (which
2518c609719bSwdenk		indicated a CRC error).
2519c609719bSwdenk
25206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2521c609719bSwdenk
2522c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2523c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2524c609719bSwdenk		FPGA configuration sequence. The default time is 500
252511ccc33fSMarcel Ziswiler		ms.
2526c609719bSwdenk
25276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2528c609719bSwdenk
2529c609719bSwdenk		Maximum time to wait for BUSY to deassert during
253011ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2531c609719bSwdenk
25326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2533c609719bSwdenk
2534c609719bSwdenk		Time to wait after FPGA configuration. The default is
253511ccc33fSMarcel Ziswiler		200 ms.
2536c609719bSwdenk
2537c609719bSwdenk- Configuration Management:
2538c609719bSwdenk		CONFIG_IDENT_STRING
2539c609719bSwdenk
2540c609719bSwdenk		If defined, this string will be added to the U-Boot
2541c609719bSwdenk		version information (U_BOOT_VERSION)
2542c609719bSwdenk
2543c609719bSwdenk- Vendor Parameter Protection:
2544c609719bSwdenk
2545c609719bSwdenk		U-Boot considers the values of the environment
2546c609719bSwdenk		variables "serial#" (Board Serial Number) and
25477152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2548c609719bSwdenk		are set once by the board vendor / manufacturer, and
2549c609719bSwdenk		protects these variables from casual modification by
2550c609719bSwdenk		the user. Once set, these variables are read-only,
2551c609719bSwdenk		and write or delete attempts are rejected. You can
255211ccc33fSMarcel Ziswiler		change this behaviour:
2553c609719bSwdenk
2554c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2555c609719bSwdenk		file, the write protection for vendor parameters is
255647cd00faSwdenk		completely disabled. Anybody can change or delete
2557c609719bSwdenk		these parameters.
2558c609719bSwdenk
2559c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2560c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
256111ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2562c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2563c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2564c609719bSwdenk		read-only.]
2565c609719bSwdenk
25662598090bSJoe Hershberger		The same can be accomplished in a more flexible way
25672598090bSJoe Hershberger		for any variable by configuring the type of access
25682598090bSJoe Hershberger		to allow for those variables in the ".flags" variable
25692598090bSJoe Hershberger		or define CONFIG_ENV_FLAGS_LIST_STATIC.
25702598090bSJoe Hershberger
2571c609719bSwdenk- Protected RAM:
2572c609719bSwdenk		CONFIG_PRAM
2573c609719bSwdenk
2574c609719bSwdenk		Define this variable to enable the reservation of
2575c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2576c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2577c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2578c609719bSwdenk		this default value by defining an environment
2579c609719bSwdenk		variable "pram" to the number of kB you want to
2580c609719bSwdenk		reserve. Note that the board info structure will
2581c609719bSwdenk		still show the full amount of RAM. If pRAM is
2582c609719bSwdenk		reserved, a new environment variable "mem" will
2583c609719bSwdenk		automatically be defined to hold the amount of
2584c609719bSwdenk		remaining RAM in a form that can be passed as boot
2585c609719bSwdenk		argument to Linux, for instance like that:
2586c609719bSwdenk
2587fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2588c609719bSwdenk			saveenv
2589c609719bSwdenk
2590c609719bSwdenk		This way you can tell Linux not to use this memory,
2591c609719bSwdenk		either, which results in a memory region that will
2592c609719bSwdenk		not be affected by reboots.
2593c609719bSwdenk
2594c609719bSwdenk		*WARNING* If your board configuration uses automatic
2595c609719bSwdenk		detection of the RAM size, you must make sure that
2596c609719bSwdenk		this memory test is non-destructive. So far, the
2597c609719bSwdenk		following board configurations are known to be
2598c609719bSwdenk		"pRAM-clean":
2599c609719bSwdenk
26001b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
26011b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2602544d97e9SWolfgang Denk			FLAGADM, TQM8260
2603c609719bSwdenk
260440fef049SGabe Black- Access to physical memory region (> 4GB)
260540fef049SGabe Black		Some basic support is provided for operations on memory not
260640fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
260740fef049SGabe Black		support access to more than 4GB of memory on 32-bit
260840fef049SGabe Black		machines using physical address extension or similar.
260940fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
261040fef049SGabe Black		currently only supports clearing the memory.
261140fef049SGabe Black
2612c609719bSwdenk- Error Recovery:
2613c609719bSwdenk		CONFIG_PANIC_HANG
2614c609719bSwdenk
2615c609719bSwdenk		Define this variable to stop the system in case of a
2616c609719bSwdenk		fatal error, so that you have to reset it manually.
2617c609719bSwdenk		This is probably NOT a good idea for an embedded
261811ccc33fSMarcel Ziswiler		system where you want the system to reboot
2619c609719bSwdenk		automatically as fast as possible, but it may be
2620c609719bSwdenk		useful during development since you can try to debug
2621c609719bSwdenk		the conditions that lead to the situation.
2622c609719bSwdenk
2623c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2624c609719bSwdenk
2625c609719bSwdenk		This variable defines the number of retries for
2626c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2627c609719bSwdenk		before giving up the operation. If not defined, a
2628c609719bSwdenk		default value of 5 is used.
2629c609719bSwdenk
263040cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
263140cb90eeSGuennadi Liakhovetski
263240cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
263340cb90eeSGuennadi Liakhovetski
263448a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
263548a3e999STetsuyuki Kobayashi
263648a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
263748a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
263848a3e999STetsuyuki Kobayashi		try longer timeout such as
263948a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
264048a3e999STetsuyuki Kobayashi
2641c609719bSwdenk- Command Interpreter:
26428078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
264304a85b3bSwdenk
264404a85b3bSwdenk		Enable auto completion of commands using TAB.
264504a85b3bSwdenk
26468078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
26478078f1a5SWolfgang Denk		for the "hush" shell.
26488078f1a5SWolfgang Denk
26498078f1a5SWolfgang Denk
26506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2651c609719bSwdenk
2652c609719bSwdenk		Define this variable to enable the "hush" shell (from
2653c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2654c609719bSwdenk		powerful command line syntax like
2655c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2656c609719bSwdenk		constructs ("shell scripts").
2657c609719bSwdenk
2658c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2659c609719bSwdenk		with a somewhat smaller memory footprint.
2660c609719bSwdenk
2661c609719bSwdenk
26626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2663c609719bSwdenk
2664c609719bSwdenk		This defines the secondary prompt string, which is
2665c609719bSwdenk		printed when the command interpreter needs more input
2666c609719bSwdenk		to complete a command. Usually "> ".
2667c609719bSwdenk
2668c609719bSwdenk	Note:
2669c609719bSwdenk
2670c609719bSwdenk		In the current implementation, the local variables
2671c609719bSwdenk		space and global environment variables space are
2672c609719bSwdenk		separated. Local variables are those you define by
26733b57fe0aSwdenk		simply typing `name=value'. To access a local
2674c609719bSwdenk		variable later on, you have write `$name' or
26753b57fe0aSwdenk		`${name}'; to execute the contents of a variable
26763b57fe0aSwdenk		directly type `$name' at the command prompt.
2677c609719bSwdenk
2678c609719bSwdenk		Global environment variables are those you use
2679c609719bSwdenk		setenv/printenv to work with. To run a command stored
2680c609719bSwdenk		in such a variable, you need to use the run command,
2681c609719bSwdenk		and you must not use the '$' sign to access them.
2682c609719bSwdenk
2683c609719bSwdenk		To store commands and special characters in a
2684c609719bSwdenk		variable, please use double quotation marks
2685c609719bSwdenk		surrounding the whole text of the variable, instead
2686c609719bSwdenk		of the backslashes before semicolons and special
2687c609719bSwdenk		symbols.
2688c609719bSwdenk
2689aa0c71acSWolfgang Denk- Commandline Editing and History:
2690aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2691aa0c71acSWolfgang Denk
269211ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2693aa0c71acSWolfgang Denk		commandline input operations
2694aa0c71acSWolfgang Denk
2695a8c7c708Swdenk- Default Environment:
2696c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2697c609719bSwdenk
2698c609719bSwdenk		Define this to contain any number of null terminated
2699c609719bSwdenk		strings (variable = value pairs) that will be part of
27007152b1d0Swdenk		the default environment compiled into the boot image.
27012262cfeeSwdenk
2702c609719bSwdenk		For example, place something like this in your
2703c609719bSwdenk		board's config file:
2704c609719bSwdenk
2705c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2706c609719bSwdenk			"myvar1=value1\0" \
2707c609719bSwdenk			"myvar2=value2\0"
2708c609719bSwdenk
2709c609719bSwdenk		Warning: This method is based on knowledge about the
2710c609719bSwdenk		internal format how the environment is stored by the
27112262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2712c609719bSwdenk		interface! Although it is unlikely that this format
27137152b1d0Swdenk		will change soon, there is no guarantee either.
2714c609719bSwdenk		You better know what you are doing here.
2715c609719bSwdenk
2716c609719bSwdenk		Note: overly (ab)use of the default environment is
2717c609719bSwdenk		discouraged. Make sure to check other ways to preset
271874de7aefSWolfgang Denk		the environment like the "source" command or the
2719c609719bSwdenk		boot command first.
2720c609719bSwdenk
27215e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
27225e724ca2SStephen Warren
27235e724ca2SStephen Warren		Define this in order to add variables describing the
27245e724ca2SStephen Warren		U-Boot build configuration to the default environment.
27255e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
27265e724ca2SStephen Warren
27275e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
27285e724ca2SStephen Warren
27295e724ca2SStephen Warren		- CONFIG_SYS_ARCH
27305e724ca2SStephen Warren		- CONFIG_SYS_CPU
27315e724ca2SStephen Warren		- CONFIG_SYS_BOARD
27325e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
27335e724ca2SStephen Warren		- CONFIG_SYS_SOC
27345e724ca2SStephen Warren
27357e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
27367e27f89fSTom Rini
27377e27f89fSTom Rini		Define this in order to add variables describing certain
27387e27f89fSTom Rini		run-time determined information about the hardware to the
27397e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
27407e27f89fSTom Rini
274106fd8538SSimon Glass		CONFIG_DELAY_ENVIRONMENT
274206fd8538SSimon Glass
274306fd8538SSimon Glass		Normally the environment is loaded when the board is
274406fd8538SSimon Glass		intialised so that it is available to U-Boot. This inhibits
274506fd8538SSimon Glass		that so that the environment is not available until
274606fd8538SSimon Glass		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
274706fd8538SSimon Glass		this is instead controlled by the value of
274806fd8538SSimon Glass		/config/load-environment.
274906fd8538SSimon Glass
2750a8c7c708Swdenk- DataFlash Support:
27512abbe075Swdenk		CONFIG_HAS_DATAFLASH
27522abbe075Swdenk
27532abbe075Swdenk		Defining this option enables DataFlash features and
27542abbe075Swdenk		allows to read/write in Dataflash via the standard
27552abbe075Swdenk		commands cp, md...
27562abbe075Swdenk
2757f61ec45eSEric Nelson- Serial Flash support
2758f61ec45eSEric Nelson		CONFIG_CMD_SF
2759f61ec45eSEric Nelson
2760f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2761f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2762f61ec45eSEric Nelson
2763f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2764f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2765f61ec45eSEric Nelson		commands.
2766f61ec45eSEric Nelson
2767f61ec45eSEric Nelson		The following defaults may be provided by the platform
2768f61ec45eSEric Nelson		to handle the common case when only a single serial
2769f61ec45eSEric Nelson		flash is present on the system.
2770f61ec45eSEric Nelson
2771f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2772f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2773f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2774f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2775f61ec45eSEric Nelson
277624007273SSimon Glass		CONFIG_CMD_SF_TEST
277724007273SSimon Glass
277824007273SSimon Glass		Define this option to include a destructive SPI flash
277924007273SSimon Glass		test ('sf test').
278024007273SSimon Glass
27811dcd6d03SJagannadha Sutradharudu Teki		CONFIG_SPI_FLASH_BAR		Ban/Extended Addr Reg
27821dcd6d03SJagannadha Sutradharudu Teki
27831dcd6d03SJagannadha Sutradharudu Teki		Define this option to use the Bank addr/Extended addr
27841dcd6d03SJagannadha Sutradharudu Teki		support on SPI flashes which has size > 16Mbytes.
27851dcd6d03SJagannadha Sutradharudu Teki
2786b902e07cSJagannadha Sutradharudu Teki		CONFIG_SF_DUAL_FLASH		Dual flash memories
2787b902e07cSJagannadha Sutradharudu Teki
2788b902e07cSJagannadha Sutradharudu Teki		Define this option to use dual flash support where two flash
2789b902e07cSJagannadha Sutradharudu Teki		memories can be connected with a given cs line.
2790b902e07cSJagannadha Sutradharudu Teki		currently Xilinx Zynq qspi support these type of connections.
2791b902e07cSJagannadha Sutradharudu Teki
27923f85ce27Swdenk- SystemACE Support:
27933f85ce27Swdenk		CONFIG_SYSTEMACE
27943f85ce27Swdenk
27953f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
27963f85ce27Swdenk		chips attached via some sort of local bus. The address
279711ccc33fSMarcel Ziswiler		of the chip must also be defined in the
27986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
27993f85ce27Swdenk
28003f85ce27Swdenk		#define CONFIG_SYSTEMACE
28016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
28023f85ce27Swdenk
28033f85ce27Swdenk		When SystemACE support is added, the "ace" device type
28043f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
28053f85ce27Swdenk
2806ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2807ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2808ecb0ccd9SWolfgang Denk
280928cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2810ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
281128cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2812ecb0ccd9SWolfgang Denk		number generator is used.
2813ecb0ccd9SWolfgang Denk
281428cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
281528cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
281628cb9375SWolfgang Denk		defined, the normal port 69 is used.
281728cb9375SWolfgang Denk
281828cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2819ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2820ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2821ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2822ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2823ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2824ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2825ecb0ccd9SWolfgang Denk
2826bf36c5d5SSimon Glass- Hashing support:
2827bf36c5d5SSimon Glass		CONFIG_CMD_HASH
2828bf36c5d5SSimon Glass
2829bf36c5d5SSimon Glass		This enables a generic 'hash' command which can produce
2830bf36c5d5SSimon Glass		hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2831bf36c5d5SSimon Glass
2832bf36c5d5SSimon Glass		CONFIG_HASH_VERIFY
2833bf36c5d5SSimon Glass
2834bf36c5d5SSimon Glass		Enable the hash verify command (hash -v). This adds to code
2835bf36c5d5SSimon Glass		size a little.
2836bf36c5d5SSimon Glass
2837bf36c5d5SSimon Glass		CONFIG_SHA1 - support SHA1 hashing
2838bf36c5d5SSimon Glass		CONFIG_SHA256 - support SHA256 hashing
2839bf36c5d5SSimon Glass
2840bf36c5d5SSimon Glass		Note: There is also a sha1sum command, which should perhaps
2841bf36c5d5SSimon Glass		be deprecated in favour of 'hash sha1'.
2842bf36c5d5SSimon Glass
2843a11f1873SRobert Winkler- Freescale i.MX specific commands:
2844a11f1873SRobert Winkler		CONFIG_CMD_HDMIDETECT
2845a11f1873SRobert Winkler		This enables 'hdmidet' command which returns true if an
2846a11f1873SRobert Winkler		HDMI monitor is detected.  This command is i.MX 6 specific.
2847a11f1873SRobert Winkler
2848a11f1873SRobert Winkler		CONFIG_CMD_BMODE
2849a11f1873SRobert Winkler		This enables the 'bmode' (bootmode) command for forcing
2850a11f1873SRobert Winkler		a boot from specific media.
2851a11f1873SRobert Winkler
2852a11f1873SRobert Winkler		This is useful for forcing the ROM's usb downloader to
2853a11f1873SRobert Winkler		activate upon a watchdog reset which is nice when iterating
2854a11f1873SRobert Winkler		on U-Boot.  Using the reset button or running bmode normal
2855a11f1873SRobert Winkler		will set it back to normal.  This command currently
2856a11f1873SRobert Winkler		supports i.MX53 and i.MX6.
2857a11f1873SRobert Winkler
285819c402afSSimon Glass- Signing support:
285919c402afSSimon Glass		CONFIG_RSA
286019c402afSSimon Glass
286119c402afSSimon Glass		This enables the RSA algorithm used for FIT image verification
28628bf2aad7SDetlev Zundel		in U-Boot. See doc/uImage.FIT/signature.txt for more information.
286319c402afSSimon Glass
286419c402afSSimon Glass		The signing part is build into mkimage regardless of this
286519c402afSSimon Glass		option.
286619c402afSSimon Glass
28679e50c406SHeiko Schocher- bootcount support:
28689e50c406SHeiko Schocher		CONFIG_BOOTCOUNT_LIMIT
28699e50c406SHeiko Schocher
28709e50c406SHeiko Schocher		This enables the bootcounter support, see:
28719e50c406SHeiko Schocher		http://www.denx.de/wiki/DULG/UBootBootCountLimit
28729e50c406SHeiko Schocher
28739e50c406SHeiko Schocher		CONFIG_AT91SAM9XE
28749e50c406SHeiko Schocher		enable special bootcounter support on at91sam9xe based boards.
28759e50c406SHeiko Schocher		CONFIG_BLACKFIN
28769e50c406SHeiko Schocher		enable special bootcounter support on blackfin based boards.
28779e50c406SHeiko Schocher		CONFIG_SOC_DA8XX
28789e50c406SHeiko Schocher		enable special bootcounter support on da850 based boards.
28799e50c406SHeiko Schocher		CONFIG_BOOTCOUNT_RAM
28809e50c406SHeiko Schocher		enable support for the bootcounter in RAM
28819e50c406SHeiko Schocher		CONFIG_BOOTCOUNT_I2C
28829e50c406SHeiko Schocher		enable support for the bootcounter on an i2c (like RTC) device.
28839e50c406SHeiko Schocher			CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
28849e50c406SHeiko Schocher			CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
28859e50c406SHeiko Schocher						    the bootcounter.
28869e50c406SHeiko Schocher			CONFIG_BOOTCOUNT_ALEN = address len
288719c402afSSimon Glass
2888a8c7c708Swdenk- Show boot progress:
2889c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2890c609719bSwdenk
2891c609719bSwdenk		Defining this option allows to add some board-
2892c609719bSwdenk		specific code (calling a user-provided function
2893c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2894c609719bSwdenk		the system's boot progress on some display (for
2895c609719bSwdenk		example, some LED's) on your board. At the moment,
2896c609719bSwdenk		the following checkpoints are implemented:
2897c609719bSwdenk
28983a608ca0SSimon Glass- Detailed boot stage timing
28993a608ca0SSimon Glass		CONFIG_BOOTSTAGE
29003a608ca0SSimon Glass		Define this option to get detailed timing of each stage
29013a608ca0SSimon Glass		of the boot process.
29023a608ca0SSimon Glass
29033a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
29043a608ca0SSimon Glass		This is the number of available user bootstage records.
29053a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
29063a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
29073a608ca0SSimon Glass		the limit, recording will stop.
29083a608ca0SSimon Glass
29093a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
29103a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
29113a608ca0SSimon Glass
29123a608ca0SSimon Glass		Timer summary in microseconds:
29133a608ca0SSimon Glass		       Mark    Elapsed  Stage
29143a608ca0SSimon Glass			  0          0  reset
29153a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
29163a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
29173a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
29183a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
29193a608ca0SSimon Glass		  3,910,375    250,777  main_loop
29203a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
29213a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
29223a608ca0SSimon Glass
29232eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
29242eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
29252eba38cfSSimon Glass		and un/stashing of bootstage data.
29262eba38cfSSimon Glass
292794fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
292894fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
292994fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
293094fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
293194fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
293294fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
293394fd1316SSimon Glass		For example:
293494fd1316SSimon Glass
293594fd1316SSimon Glass		bootstage {
293694fd1316SSimon Glass			154 {
293794fd1316SSimon Glass				name = "board_init_f";
293894fd1316SSimon Glass				mark = <3575678>;
293994fd1316SSimon Glass			};
294094fd1316SSimon Glass			170 {
294194fd1316SSimon Glass				name = "lcd";
294294fd1316SSimon Glass				accum = <33482>;
294394fd1316SSimon Glass			};
294494fd1316SSimon Glass		};
294594fd1316SSimon Glass
294694fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
294794fd1316SSimon Glass
29481372cce2SMarian BalakowiczLegacy uImage format:
29491372cce2SMarian Balakowicz
2950c609719bSwdenk  Arg	Where			When
2951c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2952c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2953c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2954c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2955c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2956c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2957c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2958c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2959c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
29601372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2961c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2962c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2963c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2964c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
29651372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2966c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
29671372cce2SMarian Balakowicz
29681372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
29691372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
29701372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
29711372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
29721372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
29731372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
29741372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
297511ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
29761372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
29771372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
29781372cce2SMarian Balakowicz
2979ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2980c609719bSwdenk
2981a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
298263e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
298363e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
298463e73c9aSwdenk
2985566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2986566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2987566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2988566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2989566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2990566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2991566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2992566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2993566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2994566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2995566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2996566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2997566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2998566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2999566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
3000566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
3001566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
3002566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
3003566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
3004566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
3005566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
3006566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
3007566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
3008566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
3009566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
3010566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
3011566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
3012566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
3013566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
3014566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
3015566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
3016566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
3017566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
3018566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
3019566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
3020566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
3021566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
3022566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
3023566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
3024566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
3025566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
3026566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
3027566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
3028566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
3029566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
3030566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
3031566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
3032c609719bSwdenk
3033566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
3034c609719bSwdenk
3035566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
3036566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
3037566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
3038206c60cbSwdenk
3039566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
3040566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
304111ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
3042566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
3043566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
3044566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
304574de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
304674de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
3047566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
3048c609719bSwdenk
30491372cce2SMarian BalakowiczFIT uImage format:
30501372cce2SMarian Balakowicz
30511372cce2SMarian Balakowicz  Arg	Where			When
30521372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
30531372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
30541372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
30551372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
30561372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
30571372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
3058f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
30591372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
30601372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
30611372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
30621372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
30631372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
306411ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
306511ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
30661372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
30671372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
30681372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
30691372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
30701372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
30711372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
30721372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
30731372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
30741372cce2SMarian Balakowicz
30751372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
30761372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
30771372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
307811ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
30791372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
30801372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
30811372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
30821372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
30831372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
30841372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
30851372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
30861372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
30871372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
30881372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
30891372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
30901372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
30911372cce2SMarian Balakowicz
309211ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
30931372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
30941372cce2SMarian Balakowicz
309511ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
30961372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
30971372cce2SMarian Balakowicz
309811ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
30991372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
31001372cce2SMarian Balakowicz
3101d95f6ec7SGabe Black- FIT image support:
3102d95f6ec7SGabe Black		CONFIG_FIT
3103d95f6ec7SGabe Black		Enable support for the FIT uImage format.
3104d95f6ec7SGabe Black
3105d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
3106d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
3107d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
3108d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
3109d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
3110d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
3111d95f6ec7SGabe Black
31123e569a6bSSimon Glass		CONFIG_FIT_SIGNATURE
31133e569a6bSSimon Glass		This option enables signature verification of FIT uImages,
31143e569a6bSSimon Glass		using a hash signed and verified using RSA. See
31153e569a6bSSimon Glass		doc/uImage.FIT/signature.txt for more details.
31163e569a6bSSimon Glass
31174cf2609bSWolfgang Denk- Standalone program support:
31184cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
31194cf2609bSWolfgang Denk
31206feff899SWolfgang Denk		This option defines a board specific value for the
31216feff899SWolfgang Denk		address where standalone program gets loaded, thus
31226feff899SWolfgang Denk		overwriting the architecture dependent default
31234cf2609bSWolfgang Denk		settings.
31244cf2609bSWolfgang Denk
31254cf2609bSWolfgang Denk- Frame Buffer Address:
31264cf2609bSWolfgang Denk		CONFIG_FB_ADDR
31274cf2609bSWolfgang Denk
31284cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
312944a53b57SWolfgang Denk		address for frame buffer.  This is typically the case
313044a53b57SWolfgang Denk		when using a graphics controller has separate video
313144a53b57SWolfgang Denk		memory.  U-Boot will then place the frame buffer at
313244a53b57SWolfgang Denk		the given address instead of dynamically reserving it
313344a53b57SWolfgang Denk		in system RAM by calling lcd_setmem(), which grabs
313444a53b57SWolfgang Denk		the memory for the frame buffer depending on the
313544a53b57SWolfgang Denk		configured panel size.
31364cf2609bSWolfgang Denk
31374cf2609bSWolfgang Denk		Please see board_init_f function.
31384cf2609bSWolfgang Denk
3139cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
3140cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
3141cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
3142cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
3143cccfc2abSDetlev Zundel
3144cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
3145cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
3146cccfc2abSDetlev Zundel
3147cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
3148cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
3149cccfc2abSDetlev Zundel
3150cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
3151cccfc2abSDetlev Zundel		Needed for mtdparts command support.
3152cccfc2abSDetlev Zundel
3153cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
3154cccfc2abSDetlev Zundel
3155cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
3156cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
3157cccfc2abSDetlev Zundel
315870c219cdSJoe Hershberger- UBI support
315970c219cdSJoe Hershberger		CONFIG_CMD_UBI
316070c219cdSJoe Hershberger
316170c219cdSJoe Hershberger		Adds commands for interacting with MTD partitions formatted
316270c219cdSJoe Hershberger		with the UBI flash translation layer
316370c219cdSJoe Hershberger
316470c219cdSJoe Hershberger		Requires also defining CONFIG_RBTREE
316570c219cdSJoe Hershberger
3166147162daSJoe Hershberger		CONFIG_UBI_SILENCE_MSG
3167147162daSJoe Hershberger
3168147162daSJoe Hershberger		Make the verbose messages from UBI stop printing.  This leaves
3169147162daSJoe Hershberger		warnings and errors enabled.
3170147162daSJoe Hershberger
317170c219cdSJoe Hershberger- UBIFS support
317270c219cdSJoe Hershberger		CONFIG_CMD_UBIFS
317370c219cdSJoe Hershberger
317470c219cdSJoe Hershberger		Adds commands for interacting with UBI volumes formatted as
317570c219cdSJoe Hershberger		UBIFS.  UBIFS is read-only in u-boot.
317670c219cdSJoe Hershberger
317770c219cdSJoe Hershberger		Requires UBI support as well as CONFIG_LZO
317870c219cdSJoe Hershberger
3179147162daSJoe Hershberger		CONFIG_UBIFS_SILENCE_MSG
3180147162daSJoe Hershberger
3181147162daSJoe Hershberger		Make the verbose messages from UBIFS stop printing.  This leaves
3182147162daSJoe Hershberger		warnings and errors enabled.
3183147162daSJoe Hershberger
31846a11cf48SDaniel Schwierzeck- SPL framework
31856a11cf48SDaniel Schwierzeck		CONFIG_SPL
31866a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
31876a11cf48SDaniel Schwierzeck
318895579793STom Rini		CONFIG_SPL_LDSCRIPT
318995579793STom Rini		LDSCRIPT for linking the SPL binary.
319095579793STom Rini
31916ebc3461SAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT
31926ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL, BSS included.
31936ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory
31946ebc3461SAlbert ARIBAUD		used by SPL from _start to __bss_end does not exceed it.
31958960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
31966ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
31976ebc3461SAlbert ARIBAUD
319895579793STom Rini		CONFIG_SPL_MAX_SIZE
31996ebc3461SAlbert ARIBAUD		Maximum size of the SPL image (text, data, rodata, and
32006ebc3461SAlbert ARIBAUD		linker lists sections), BSS excluded.
32016ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual size does
32026ebc3461SAlbert ARIBAUD		not exceed it.
320395579793STom Rini
32046a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
32056a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
32066a11cf48SDaniel Schwierzeck
320794a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
320894a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
320994a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
321094a45bb1SScott Wood
321195579793STom Rini		CONFIG_SPL_BSS_START_ADDR
321295579793STom Rini		Link address for the BSS within the SPL binary.
321395579793STom Rini
321495579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
32156ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL BSS.
32166ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory used
32176ebc3461SAlbert ARIBAUD		by SPL from __bss_start to __bss_end does not exceed it.
32188960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
32196ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
322095579793STom Rini
322195579793STom Rini		CONFIG_SPL_STACK
322295579793STom Rini		Adress of the start of the stack SPL will use
322395579793STom Rini
322494a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
322594a45bb1SScott Wood		Adress of the start of the stack SPL will use after
322694a45bb1SScott Wood		relocation.  If unspecified, this is equal to
322794a45bb1SScott Wood		CONFIG_SPL_STACK.
322894a45bb1SScott Wood
322995579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
323095579793STom Rini		Starting address of the malloc pool used in SPL.
323195579793STom Rini
323295579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
323395579793STom Rini		The size of the malloc pool used in SPL.
32346a11cf48SDaniel Schwierzeck
323547f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
323647f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
323747f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
323847f7bcaeSTom Rini		NAND loading of the Linux Kernel.
323947f7bcaeSTom Rini
3240861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
3241861a86f4STom Rini		For ARM, enable an optional function to print more information
3242861a86f4STom Rini		about the running system.
3243861a86f4STom Rini
32444b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
32454b919725SScott Wood		Arch init code should be built for a very small image
32464b919725SScott Wood
32476a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
32486a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
32496a11cf48SDaniel Schwierzeck
32506a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
32516a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
32526a11cf48SDaniel Schwierzeck
32536a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
32546a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
32556a11cf48SDaniel Schwierzeck
32566a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
32576a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
32586a11cf48SDaniel Schwierzeck
32596a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
32606a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
32616a11cf48SDaniel Schwierzeck
326295579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
326395579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
326495579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
326595579793STom Rini		Address, size and partition on the MMC to load U-Boot from
326695579793STom Rini		when the MMC is being used in raw mode.
326795579793STom Rini
32682b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
32692b75b0adSPeter Korsgaard		Sector to load kernel uImage from when MMC is being
32702b75b0adSPeter Korsgaard		used in raw mode (for Falcon mode)
32712b75b0adSPeter Korsgaard
32722b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
32732b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
32742b75b0adSPeter Korsgaard		Sector and number of sectors to load kernel argument
32752b75b0adSPeter Korsgaard		parameters from when MMC is being used in raw mode
32762b75b0adSPeter Korsgaard		(for falcon mode)
32772b75b0adSPeter Korsgaard
327895579793STom Rini		CONFIG_SPL_FAT_SUPPORT
327995579793STom Rini		Support for fs/fat/libfat.o in SPL binary
328095579793STom Rini
328195579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
328295579793STom Rini		Filename to read to load U-Boot when reading from FAT
328395579793STom Rini
32847ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_KERNEL_NAME
32857ad2cc79SPeter Korsgaard		Filename to read to load kernel uImage when reading
32867ad2cc79SPeter Korsgaard		from FAT (for Falcon mode)
32877ad2cc79SPeter Korsgaard
32887ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_ARGS_NAME
32897ad2cc79SPeter Korsgaard		Filename to read to load kernel argument parameters
32907ad2cc79SPeter Korsgaard		when reading from FAT (for Falcon mode)
32917ad2cc79SPeter Korsgaard
329206f60ae3SScott Wood		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
329306f60ae3SScott Wood		Set this for NAND SPL on PPC mpc83xx targets, so that
329406f60ae3SScott Wood		start.S waits for the rest of the SPL to load before
329506f60ae3SScott Wood		continuing (the hardware starts execution after just
329606f60ae3SScott Wood		loading the first page rather than the full 4K).
329706f60ae3SScott Wood
32986f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
32996f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
33006f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
33016f2f01b9SScott Wood
33026f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
33036f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
33046f2f01b9SScott Wood
33056f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
33066f2f01b9SScott Wood		Include standard software ECC in the SPL
33076f2f01b9SScott Wood
330895579793STom Rini		CONFIG_SPL_NAND_SIMPLE
33097d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
33107d4b7955SScott Wood		expose the cmd_ctrl() interface.
331195579793STom Rini
3312bb0dc108SYing Zhang		CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
3313bb0dc108SYing Zhang		Set for the SPL on PPC mpc8xxx targets, support for
33145614e71bSYork Sun		drivers/ddr/fsl/libddr.o in SPL binary.
3315bb0dc108SYing Zhang
33167c8eea59SYing Zhang		CONFIG_SPL_COMMON_INIT_DDR
33177c8eea59SYing Zhang		Set for common ddr init with serial presence detect in
33187c8eea59SYing Zhang		SPL binary.
33197c8eea59SYing Zhang
332095579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
332195579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
332295579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
332395579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
332495579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
332595579793STom Rini		Defines the size and behavior of the NAND that SPL uses
33267d4b7955SScott Wood		to read U-Boot
332795579793STom Rini
3328fbe76ae4SPrabhakar Kushwaha		CONFIG_SPL_NAND_BOOT
3329fbe76ae4SPrabhakar Kushwaha		Add support NAND boot
3330fbe76ae4SPrabhakar Kushwaha
333195579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
33327d4b7955SScott Wood		Location in NAND to read U-Boot from
33337d4b7955SScott Wood
33347d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
33357d4b7955SScott Wood		Location in memory to load U-Boot to
33367d4b7955SScott Wood
33377d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
33387d4b7955SScott Wood		Size of image to load
333995579793STom Rini
334095579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
33417d4b7955SScott Wood		Entry point in loaded image to jump to
334295579793STom Rini
334395579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
334495579793STom Rini		Define this if you need to first read the OOB and then the
334595579793STom Rini		data. This is used for example on davinci plattforms.
334695579793STom Rini
334795579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
334895579793STom Rini		Support for an OMAP3-specific set of functions to return the
334995579793STom Rini		ID and MFR of the first attached NAND chip, if present.
335095579793STom Rini
33516a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
33526a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
33536a11cf48SDaniel Schwierzeck
33546a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
33556a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
33566a11cf48SDaniel Schwierzeck
33576a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
33586a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
33596a11cf48SDaniel Schwierzeck
3360c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
3361c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
3362c57b953dSPavel Machek
33636a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
33646a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
33651372cce2SMarian Balakowicz
3366ba1bee43SYing Zhang		CONFIG_SPL_ENV_SUPPORT
3367ba1bee43SYing Zhang		Support for the environment operating in SPL binary
3368ba1bee43SYing Zhang
3369ba1bee43SYing Zhang		CONFIG_SPL_NET_SUPPORT
3370ba1bee43SYing Zhang		Support for the net/libnet.o in SPL binary.
3371ba1bee43SYing Zhang		It conflicts with SPL env from storage medium specified by
3372ba1bee43SYing Zhang		CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3373ba1bee43SYing Zhang
337474752baaSScott Wood		CONFIG_SPL_PAD_TO
33756113d3f2SBenoît Thébaudeau		Image offset to which the SPL should be padded before appending
33766113d3f2SBenoît Thébaudeau		the SPL payload. By default, this is defined as
33776113d3f2SBenoît Thébaudeau		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
33786113d3f2SBenoît Thébaudeau		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
33796113d3f2SBenoît Thébaudeau		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
338074752baaSScott Wood
3381ca2fca22SScott Wood		CONFIG_SPL_TARGET
3382ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
3383ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
3384ca2fca22SScott Wood		example if more than one image needs to be produced.
3385ca2fca22SScott Wood
338687ebee39SSimon Glass		CONFIG_FIT_SPL_PRINT
338787ebee39SSimon Glass		Printing information about a FIT image adds quite a bit of
338887ebee39SSimon Glass		code to SPL. So this is normally disabled in SPL. Use this
338987ebee39SSimon Glass		option to re-enable it. This will affect the output of the
339087ebee39SSimon Glass		bootm command when booting a FIT image.
339187ebee39SSimon Glass
33923aa29de0SYing Zhang- TPL framework
33933aa29de0SYing Zhang		CONFIG_TPL
33943aa29de0SYing Zhang		Enable building of TPL globally.
33953aa29de0SYing Zhang
33963aa29de0SYing Zhang		CONFIG_TPL_PAD_TO
33973aa29de0SYing Zhang		Image offset to which the TPL should be padded before appending
33983aa29de0SYing Zhang		the TPL payload. By default, this is defined as
33993aa29de0SYing Zhang		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
34003aa29de0SYing Zhang		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
34013aa29de0SYing Zhang		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
34023aa29de0SYing Zhang
3403c609719bSwdenkModem Support:
3404c609719bSwdenk--------------
3405c609719bSwdenk
3406566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
3407c609719bSwdenk
340811ccc33fSMarcel Ziswiler- Modem support enable:
3409c609719bSwdenk		CONFIG_MODEM_SUPPORT
3410c609719bSwdenk
3411c609719bSwdenk- RTS/CTS Flow control enable:
3412c609719bSwdenk		CONFIG_HWFLOW
3413c609719bSwdenk
3414c609719bSwdenk- Modem debug support:
3415c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
3416c609719bSwdenk
3417c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
3418c609719bSwdenk		for modem support. Useful only with BDI2000.
3419c609719bSwdenk
3420a8c7c708Swdenk- Interrupt support (PPC):
3421a8c7c708Swdenk
3422a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
3423a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
342411ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
3425a8c7c708Swdenk		should set decrementer_count to appropriate value. If
342611ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
3427a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
342811ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
3429a8c7c708Swdenk		specific handling. If board has watchdog / status_led
3430a8c7c708Swdenk		/ other_activity_monitor it works automatically from
3431a8c7c708Swdenk		general timer_interrupt().
3432a8c7c708Swdenk
3433c609719bSwdenk- General:
3434c609719bSwdenk
3435c609719bSwdenk		In the target system modem support is enabled when a
3436c609719bSwdenk		specific key (key combination) is pressed during
3437c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
343811ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
3439c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
3440c609719bSwdenk		function, returning 1 and thus enabling modem
3441c609719bSwdenk		initialization.
3442c609719bSwdenk
3443c609719bSwdenk		If there are no modem init strings in the
3444c609719bSwdenk		environment, U-Boot proceed to autoboot; the
3445c609719bSwdenk		previous output (banner, info printfs) will be
344611ccc33fSMarcel Ziswiler		suppressed, though.
3447c609719bSwdenk
3448c609719bSwdenk		See also: doc/README.Modem
3449c609719bSwdenk
34509660e442SHelmut RaigerBoard initialization settings:
34519660e442SHelmut Raiger------------------------------
34529660e442SHelmut Raiger
34539660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
34549660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
34559660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
34569660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
34579660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
34589660e442SHelmut Raigertypically in board_init_f() and board_init_r().
34599660e442SHelmut Raiger
34609660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
34619660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
34629660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
34639660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3464c609719bSwdenk
3465c609719bSwdenkConfiguration Settings:
3466c609719bSwdenk-----------------------
3467c609719bSwdenk
34686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3469c609719bSwdenk		undefine this when you're short of memory.
3470c609719bSwdenk
34712fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
34722fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
34732fb2604dSPeter Tyser
34746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
3475c609719bSwdenk		prompt for user input.
3476c609719bSwdenk
34776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
3478c609719bSwdenk
34796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
3480c609719bSwdenk
34816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
3482c609719bSwdenk
34836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3484c609719bSwdenk		the application (usually a Linux kernel) when it is
3485c609719bSwdenk		booted
3486c609719bSwdenk
34876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
3488c609719bSwdenk		List of legal baudrate settings for this board.
3489c609719bSwdenk
34906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
3491c609719bSwdenk		Suppress display of console information at boot.
3492c609719bSwdenk
34936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
3494c609719bSwdenk		If the board specific function
3495c609719bSwdenk			extern int overwrite_console (void);
3496c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
3497c609719bSwdenk		serial port, else the settings in the environment are used.
3498c609719bSwdenk
34996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3500c609719bSwdenk		Enable the call to overwrite_console().
3501c609719bSwdenk
35026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3503c609719bSwdenk		Enable overwrite of previous console environment settings.
3504c609719bSwdenk
35056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3506c609719bSwdenk		Begin and End addresses of the area used by the
3507c609719bSwdenk		simple memory test.
3508c609719bSwdenk
35096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
3510c609719bSwdenk		Enable an alternate, more extensive memory test.
3511c609719bSwdenk
35126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
35135f535fe1Swdenk		Scratch address used by the alternate memory test
35145f535fe1Swdenk		You only need to set this if address zero isn't writeable
35155f535fe1Swdenk
35166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
35176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
351814f73ca6SStefan Roese		this specified memory area will get subtracted from the top
351911ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
352014f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
352114f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
352214f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
35235e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
352414f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
35255e12e75dSStefan Roese		will have to get fixed in Linux additionally.
352614f73ca6SStefan Roese
352714f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
352814f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
352914f73ca6SStefan Roese		be touched.
353014f73ca6SStefan Roese
353114f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
353214f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
353314f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
353414f73ca6SStefan Roese		non page size aligned address and this could cause major
353514f73ca6SStefan Roese		problems.
353614f73ca6SStefan Roese
35376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
3538c609719bSwdenk		Enable temporary baudrate change while serial download
3539c609719bSwdenk
35406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
3541c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
3542c609719bSwdenk
35436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
3544c609719bSwdenk		Physical start address of Motherboard I/O (if using a
3545c609719bSwdenk		Cogent motherboard)
3546c609719bSwdenk
35476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
3548c609719bSwdenk		Physical start address of Flash memory.
3549c609719bSwdenk
35506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
3551c609719bSwdenk		Physical start address of boot monitor code (set by
3552c609719bSwdenk		make config files to be same as the text base address
355314d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
35546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
3555c609719bSwdenk
35566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
35573b57fe0aSwdenk		Size of memory reserved for monitor code, used to
35583b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
35593b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
35603b57fe0aSwdenk		flash sector.
3561c609719bSwdenk
35626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
3563c609719bSwdenk		Size of DRAM reserved for malloc() use.
3564c609719bSwdenk
35656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
356615940c9aSStefan Roese		Normally compressed uImages are limited to an
356715940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
35686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
356915940c9aSStefan Roese		to adjust this setting to your needs.
3570c609719bSwdenk
35716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
3572c609719bSwdenk		Maximum size of memory mapped by the startup code of
3573c609719bSwdenk		the Linux kernel; all data that must be processed by
35747d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
35757d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
35761bce2aebSRobert P. J. Day		environment variable is defined and non-zero. In such case
35777d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
3578c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
3579c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
3580c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
3581c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
3582c609719bSwdenk
3583fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3584fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
3585fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
3586fca43cc8SJohn Rigby		is enabled.
3587fca43cc8SJohn Rigby
3588fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3589fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3590fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3591fca43cc8SJohn Rigby
3592fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3593fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3594fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3595fca43cc8SJohn Rigby
35966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3597c609719bSwdenk		Max number of Flash memory banks
3598c609719bSwdenk
35996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3600c609719bSwdenk		Max number of sectors on a Flash chip
3601c609719bSwdenk
36026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3603c609719bSwdenk		Timeout for Flash erase operations (in ms)
3604c609719bSwdenk
36056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3606c609719bSwdenk		Timeout for Flash write operations (in ms)
3607c609719bSwdenk
36086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
36098564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
36108564acf9Swdenk
36116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
36128564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
36138564acf9Swdenk
36146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
36158564acf9Swdenk		If defined, hardware flash sectors protection is used
36168564acf9Swdenk		instead of U-Boot software protection.
36178564acf9Swdenk
36186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3619c609719bSwdenk
3620c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3621c609719bSwdenk		without this option such a download has to be
3622c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3623c609719bSwdenk		copy from RAM to flash.
3624c609719bSwdenk
3625c609719bSwdenk		The two-step approach is usually more reliable, since
3626c609719bSwdenk		you can check if the download worked before you erase
362711ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
362811ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3629c609719bSwdenk		downloaded image) this option may be very useful.
3630c609719bSwdenk
36316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3632c609719bSwdenk		Define if the flash driver uses extra elements in the
36335653fc33Swdenk		common flash structure for storing flash geometry.
36345653fc33Swdenk
363500b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
36365653fc33Swdenk		This option also enables the building of the cfi_flash driver
36375653fc33Swdenk		in the drivers directory
363853cf9435Sstroese
363991809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
364091809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
364191809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
364291809ed5SPiotr Ziecik		to the MTD layer.
364391809ed5SPiotr Ziecik
36446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
364596ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
364696ef831fSGuennadi Liakhovetski
364796ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
364896ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
364996ef831fSGuennadi Liakhovetski		write commands.
365096ef831fSGuennadi Liakhovetski
36516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
36525568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
36535568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
36545568e613SStefan Roese		is useful, if some of the configured banks are only
36555568e613SStefan Roese		optionally available.
36565568e613SStefan Roese
36579a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
36589a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
36599a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
36609a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
36619a042e9cSJerry Van Baren
3662352ef3f1SStefan Roese- CONFIG_FLASH_VERIFY
3663352ef3f1SStefan Roese		If defined, the content of the flash (destination) is compared
3664352ef3f1SStefan Roese		against the source after the write operation. An error message
3665352ef3f1SStefan Roese		will be printed when the contents are not identical.
3666352ef3f1SStefan Roese		Please note that this option is useless in nearly all cases,
3667352ef3f1SStefan Roese		since such flash programming errors usually are detected earlier
3668352ef3f1SStefan Roese		while unprotecting/erasing/programming. Please only enable
3669352ef3f1SStefan Roese		this option if you really know what you are doing.
3670352ef3f1SStefan Roese
36716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
367211ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
367311ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
367453cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
367553cf9435Sstroese		buffers can be full shortly after enabling the interface
367611ccc33fSMarcel Ziswiler		on high Ethernet traffic.
367753cf9435Sstroese		Defaults to 4 if not defined.
3678c609719bSwdenk
3679ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3680ea882bafSWolfgang Denk
3681ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3682ea882bafSWolfgang Denk	internally to store the environment settings. The default
3683ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3684ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3685ea882bafSWolfgang Denk	lib/hashtable.c for details.
3686ea882bafSWolfgang Denk
36872598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_DEFAULT
36882598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_STATIC
36891bce2aebSRobert P. J. Day	Enable validation of the values given to environment variables when
36902598090bSJoe Hershberger	calling env set.  Variables can be restricted to only decimal,
36912598090bSJoe Hershberger	hexadecimal, or boolean.  If CONFIG_CMD_NET is also defined,
36922598090bSJoe Hershberger	the variables can also be restricted to IP address or MAC address.
36932598090bSJoe Hershberger
36942598090bSJoe Hershberger	The format of the list is:
36952598090bSJoe Hershberger		type_attribute = [s|d|x|b|i|m]
3696267541f7SJoe Hershberger		access_atribute = [a|r|o|c]
3697267541f7SJoe Hershberger		attributes = type_attribute[access_atribute]
36982598090bSJoe Hershberger		entry = variable_name[:attributes]
36992598090bSJoe Hershberger		list = entry[,list]
37002598090bSJoe Hershberger
37012598090bSJoe Hershberger	The type attributes are:
37022598090bSJoe Hershberger		s - String (default)
37032598090bSJoe Hershberger		d - Decimal
37042598090bSJoe Hershberger		x - Hexadecimal
37052598090bSJoe Hershberger		b - Boolean ([1yYtT|0nNfF])
37062598090bSJoe Hershberger		i - IP address
37072598090bSJoe Hershberger		m - MAC address
37082598090bSJoe Hershberger
3709267541f7SJoe Hershberger	The access attributes are:
3710267541f7SJoe Hershberger		a - Any (default)
3711267541f7SJoe Hershberger		r - Read-only
3712267541f7SJoe Hershberger		o - Write-once
3713267541f7SJoe Hershberger		c - Change-default
3714267541f7SJoe Hershberger
37152598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_DEFAULT
37162598090bSJoe Hershberger		Define this to a list (string) to define the ".flags"
37172598090bSJoe Hershberger		envirnoment variable in the default or embedded environment.
37182598090bSJoe Hershberger
37192598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_STATIC
37202598090bSJoe Hershberger		Define this to a list (string) to define validation that
37212598090bSJoe Hershberger		should be done if an entry is not found in the ".flags"
37222598090bSJoe Hershberger		environment variable.  To override a setting in the static
37232598090bSJoe Hershberger		list, simply add an entry for the same variable name to the
37242598090bSJoe Hershberger		".flags" variable.
37252598090bSJoe Hershberger
3726267541f7SJoe Hershberger- CONFIG_ENV_ACCESS_IGNORE_FORCE
3727267541f7SJoe Hershberger	If defined, don't allow the -f switch to env set override variable
3728267541f7SJoe Hershberger	access flags.
3729267541f7SJoe Hershberger
37305c1a7ea6SSimon Glass- CONFIG_SYS_GENERIC_BOARD
37315c1a7ea6SSimon Glass	This selects the architecture-generic board system instead of the
37325c1a7ea6SSimon Glass	architecture-specific board files. It is intended to move boards
37335c1a7ea6SSimon Glass	to this new framework over time. Defining this will disable the
37345c1a7ea6SSimon Glass	arch/foo/lib/board.c file and use common/board_f.c and
37355c1a7ea6SSimon Glass	common/board_r.c instead. To use this option your architecture
37365c1a7ea6SSimon Glass	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
37375c1a7ea6SSimon Glass	its config.mk file). If you find problems enabling this option on
37385c1a7ea6SSimon Glass	your board please report the problem and send patches!
37395c1a7ea6SSimon Glass
3740632efa74SSimon Glass- CONFIG_SYS_SYM_OFFSETS
3741632efa74SSimon Glass	This is set by architectures that use offsets for link symbols
3742632efa74SSimon Glass	instead of absolute values. So bss_start is obtained using an
3743632efa74SSimon Glass	offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
3744632efa74SSimon Glass	directly. You should not need to touch this setting.
3745632efa74SSimon Glass
37460b1b60c7SLokesh Vutla- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
37470b1b60c7SLokesh Vutla	This is set by OMAP boards for the max time that reset should
37480b1b60c7SLokesh Vutla	be asserted. See doc/README.omap-reset-time for details on how
37490b1b60c7SLokesh Vutla	the value can be calulated on a given board.
3750632efa74SSimon Glass
3751c609719bSwdenkThe following definitions that deal with the placement and management
3752c609719bSwdenkof environment data (variable area); in general, we support the
3753c609719bSwdenkfollowing configurations:
3754c609719bSwdenk
3755c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3756c3eb3fe4SMike Frysinger
3757c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3758c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3759c3eb3fe4SMike Frysinger
37605a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3761c609719bSwdenk
3762c609719bSwdenk	Define this if the environment is in flash memory.
3763c609719bSwdenk
3764c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3765c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3766c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3767c609719bSwdenk	   sector" type flash chips, which have several smaller
3768c609719bSwdenk	   sectors at the start or the end. For instance, such a
3769c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3770c609719bSwdenk	   such a case you would place the environment in one of the
3771c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3772c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3773c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3774c609719bSwdenk	   between U-Boot and the environment.
3775c609719bSwdenk
37760e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3777c609719bSwdenk
3778c609719bSwdenk	   Offset of environment data (variable area) to the
3779c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3780c609719bSwdenk	   type flash chips the second sector can be used: the offset
3781c609719bSwdenk	   for this sector is given here.
3782c609719bSwdenk
37836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3784c609719bSwdenk
37850e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3786c609719bSwdenk
3787c609719bSwdenk	   This is just another way to specify the start address of
3788c609719bSwdenk	   the flash sector containing the environment (instead of
37890e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3790c609719bSwdenk
37910e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3792c609719bSwdenk
3793c609719bSwdenk	   Size of the sector containing the environment.
3794c609719bSwdenk
3795c609719bSwdenk
3796c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3797c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3798c609719bSwdenk	   the environment.
3799c609719bSwdenk
38000e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3801c609719bSwdenk
38025a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
38030e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3804c609719bSwdenk	   of this flash sector for the environment. This saves
3805c609719bSwdenk	   memory for the RAM copy of the environment.
3806c609719bSwdenk
3807c609719bSwdenk	   It may also save flash memory if you decide to use this
3808c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3809c609719bSwdenk	   since then the remainder of the flash sector could be used
3810c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3811c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3812c609719bSwdenk	   updating the environment in flash makes it always
3813c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3814c609719bSwdenk	   wrong before the contents has been restored from a copy in
3815c609719bSwdenk	   RAM, your target system will be dead.
3816c609719bSwdenk
38170e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
38180e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3819c609719bSwdenk
3820c609719bSwdenk	   These settings describe a second storage area used to hold
382111ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
38223e38691eSwdenk	   a valid backup copy in case there is a power failure during
3823c609719bSwdenk	   a "saveenv" operation.
3824c609719bSwdenk
3825c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3826c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3827c609719bSwdenkaccordingly!
3828c609719bSwdenk
3829c609719bSwdenk
38309314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3831c609719bSwdenk
3832c609719bSwdenk	Define this if you have some non-volatile memory device
3833c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3834c609719bSwdenk	environment.
3835c609719bSwdenk
38360e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
38370e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3838c609719bSwdenk
383911ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3840c609719bSwdenk	  want to use for environment. It is assumed that this memory
3841c609719bSwdenk	  can just be read and written to, without any special
3842c609719bSwdenk	  provision.
3843c609719bSwdenk
3844c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3845c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
384611ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3847c609719bSwdenkU-Boot will hang.
3848c609719bSwdenk
3849c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3850c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3851c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3852c609719bSwdenkto save the current settings.
3853c609719bSwdenk
3854c609719bSwdenk
3855bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3856c609719bSwdenk
3857c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3858c609719bSwdenk	device and a driver for it.
3859c609719bSwdenk
38600e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
38610e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3862c609719bSwdenk
3863c609719bSwdenk	  These two #defines specify the offset and size of the
3864c609719bSwdenk	  environment area within the total memory of your EEPROM.
3865c609719bSwdenk
38666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3867c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3868c609719bSwdenk	  The default address is zero.
3869c609719bSwdenk
38706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3871c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3872c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3873c609719bSwdenk	  would require six bits.
3874c609719bSwdenk
38756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3876c609719bSwdenk	  If defined, the number of milliseconds to delay between
3877c609719bSwdenk	  page writes.	The default is zero milliseconds.
3878c609719bSwdenk
38796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3880c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3881c609719bSwdenk	  that this is NOT the chip address length!
3882c609719bSwdenk
38836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
38845cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
38855cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
38865cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
38875cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
38885cf91d6bSwdenk	  byte chips.
38895cf91d6bSwdenk
38905cf91d6bSwdenk	  Note that we consider the length of the address field to
38915cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
38925cf91d6bSwdenk	  in the chip address.
38935cf91d6bSwdenk
38946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3895c609719bSwdenk	  The size in bytes of the EEPROM device.
3896c609719bSwdenk
3897548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3898548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3899548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3900548738b4SHeiko Schocher
3901548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3902548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3903548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3904548738b4SHeiko Schocher	  EEPROM. For example:
3905548738b4SHeiko Schocher
3906ea818dbbSHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  1
3907548738b4SHeiko Schocher
3908548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3909548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3910c609719bSwdenk
3911057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
39125779d8d9Swdenk
39135779d8d9Swdenk	Define this if you have a DataFlash memory device which you
39145779d8d9Swdenk	want to use for the environment.
39155779d8d9Swdenk
39160e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
39170e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
39180e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
39195779d8d9Swdenk
39205779d8d9Swdenk	  These three #defines specify the offset and size of the
39215779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
39225779d8d9Swdenk	  at the specified address.
39235779d8d9Swdenk
39240a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
39250a85a9e7SLiu Gang
39260a85a9e7SLiu Gang	Define this if you have a remote memory space which you
39270a85a9e7SLiu Gang	want to use for the local device's environment.
39280a85a9e7SLiu Gang
39290a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
39300a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
39310a85a9e7SLiu Gang
39320a85a9e7SLiu Gang	  These two #defines specify the address and size of the
39330a85a9e7SLiu Gang	  environment area within the remote memory space. The
39340a85a9e7SLiu Gang	  local device can get the environment from remote memory
3935fc54c7faSLiu Gang	  space by SRIO or PCIE links.
39360a85a9e7SLiu Gang
39370a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
39380a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3939fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3940fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
39410a85a9e7SLiu Gang
394251bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
394313a5695bSwdenk
394413a5695bSwdenk	Define this if you have a NAND device which you want to use
394513a5695bSwdenk	for the environment.
394613a5695bSwdenk
39470e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
39480e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
394913a5695bSwdenk
395013a5695bSwdenk	  These two #defines specify the offset and size of the environment
3951fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3952fdd813deSScott Wood	  aligned to an erase block boundary.
39535779d8d9Swdenk
3954fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3955e443c944SMarkus Klotzbuecher
39560e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3957fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3958fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3959fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3960fdd813deSScott Wood	  aligned to an erase block boundary.
3961e443c944SMarkus Klotzbuecher
3962fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3963fdd813deSScott Wood
3964fdd813deSScott Wood	  Specifies the length of the region in which the environment
3965fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3966fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3967fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3968fdd813deSScott Wood	  the range to be avoided.
3969fdd813deSScott Wood
3970fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3971fdd813deSScott Wood
3972fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3973fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3974fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3975fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3976fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3977e443c944SMarkus Klotzbuecher
3978b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3979b74ab737SGuennadi Liakhovetski
3980b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3981b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3982b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3983b74ab737SGuennadi Liakhovetski
39842b74433fSJoe Hershberger- CONFIG_ENV_IS_IN_UBI:
39852b74433fSJoe Hershberger
39862b74433fSJoe Hershberger	Define this if you have an UBI volume that you want to use for the
39872b74433fSJoe Hershberger	environment.  This has the benefit of wear-leveling the environment
39882b74433fSJoe Hershberger	accesses, which is important on NAND.
39892b74433fSJoe Hershberger
39902b74433fSJoe Hershberger	- CONFIG_ENV_UBI_PART:
39912b74433fSJoe Hershberger
39922b74433fSJoe Hershberger	  Define this to a string that is the mtd partition containing the UBI.
39932b74433fSJoe Hershberger
39942b74433fSJoe Hershberger	- CONFIG_ENV_UBI_VOLUME:
39952b74433fSJoe Hershberger
39962b74433fSJoe Hershberger	  Define this to the name of the volume that you want to store the
39972b74433fSJoe Hershberger	  environment in.
39982b74433fSJoe Hershberger
3999785881f7SJoe Hershberger	- CONFIG_ENV_UBI_VOLUME_REDUND:
4000785881f7SJoe Hershberger
4001785881f7SJoe Hershberger	  Define this to the name of another volume to store a second copy of
4002785881f7SJoe Hershberger	  the environment in.  This will enable redundant environments in UBI.
4003785881f7SJoe Hershberger	  It is assumed that both volumes are in the same MTD partition.
4004785881f7SJoe Hershberger
40052b74433fSJoe Hershberger	- CONFIG_UBI_SILENCE_MSG
40062b74433fSJoe Hershberger	- CONFIG_UBIFS_SILENCE_MSG
40072b74433fSJoe Hershberger
40082b74433fSJoe Hershberger	  You will probably want to define these to avoid a really noisy system
40092b74433fSJoe Hershberger	  when storing the env in UBI.
40102b74433fSJoe Hershberger
401106e4ae5fSStephen Warren- CONFIG_ENV_IS_IN_MMC:
401206e4ae5fSStephen Warren
401306e4ae5fSStephen Warren	Define this if you have an MMC device which you want to use for the
401406e4ae5fSStephen Warren	environment.
401506e4ae5fSStephen Warren
401606e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_DEV:
401706e4ae5fSStephen Warren
401806e4ae5fSStephen Warren	  Specifies which MMC device the environment is stored in.
401906e4ae5fSStephen Warren
402006e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_PART (optional):
402106e4ae5fSStephen Warren
402206e4ae5fSStephen Warren	  Specifies which MMC partition the environment is stored in. If not
402306e4ae5fSStephen Warren	  set, defaults to partition 0, the user area. Common values might be
402406e4ae5fSStephen Warren	  1 (first MMC boot partition), 2 (second MMC boot partition).
402506e4ae5fSStephen Warren
402606e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET:
402706e4ae5fSStephen Warren	- CONFIG_ENV_SIZE:
402806e4ae5fSStephen Warren
402906e4ae5fSStephen Warren	  These two #defines specify the offset and size of the environment
403006e4ae5fSStephen Warren	  area within the specified MMC device.
403106e4ae5fSStephen Warren
40325c088ee8SStephen Warren	  If offset is positive (the usual case), it is treated as relative to
40335c088ee8SStephen Warren	  the start of the MMC partition. If offset is negative, it is treated
40345c088ee8SStephen Warren	  as relative to the end of the MMC partition. This can be useful if
40355c088ee8SStephen Warren	  your board may be fitted with different MMC devices, which have
40365c088ee8SStephen Warren	  different sizes for the MMC partitions, and you always want the
40375c088ee8SStephen Warren	  environment placed at the very end of the partition, to leave the
40385c088ee8SStephen Warren	  maximum possible space before it, to store other data.
40395c088ee8SStephen Warren
404006e4ae5fSStephen Warren	  These two values are in units of bytes, but must be aligned to an
404106e4ae5fSStephen Warren	  MMC sector boundary.
404206e4ae5fSStephen Warren
404306e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET_REDUND (optional):
404406e4ae5fSStephen Warren
404506e4ae5fSStephen Warren	  Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
404606e4ae5fSStephen Warren	  hold a redundant copy of the environment data. This provides a
404706e4ae5fSStephen Warren	  valid backup copy in case the other copy is corrupted, e.g. due
404806e4ae5fSStephen Warren	  to a power failure during a "saveenv" operation.
404906e4ae5fSStephen Warren
40505c088ee8SStephen Warren	  This value may also be positive or negative; this is handled in the
40515c088ee8SStephen Warren	  same way as CONFIG_ENV_OFFSET.
40525c088ee8SStephen Warren
405306e4ae5fSStephen Warren	  This value is also in units of bytes, but must also be aligned to
405406e4ae5fSStephen Warren	  an MMC sector boundary.
405506e4ae5fSStephen Warren
405606e4ae5fSStephen Warren	- CONFIG_ENV_SIZE_REDUND (optional):
405706e4ae5fSStephen Warren
405806e4ae5fSStephen Warren	  This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
405906e4ae5fSStephen Warren	  set. If this value is set, it must be set to the same value as
406006e4ae5fSStephen Warren	  CONFIG_ENV_SIZE.
406106e4ae5fSStephen Warren
40626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
4063c609719bSwdenk
4064c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
4065c609719bSwdenk	area is used at an early stage (ROM part) if the environment
4066c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
4067c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
4068c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
4069c609719bSwdenk	to be a good choice since it makes it far enough from the
4070c609719bSwdenk	start of the data area as well as from the stack pointer.
4071c609719bSwdenk
4072e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
4073c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
4074cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
4075c609719bSwdenkuntil then to read environment variables.
4076c609719bSwdenk
407785ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
407885ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
407985ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
408085ec0bccSwdenknecessary, because the first environment variable we need is the
408185ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
408285ec0bccSwdenkhave any device yet where we could complain.]
4083c609719bSwdenk
4084c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
4085c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
408685ec0bccSwdenkuse the "saveenv" command to store a valid environment.
4087c609719bSwdenk
40886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
4089fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
4090fc3e2165Swdenk
40916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
4092fc3e2165Swdenk		      also needs to be defined.
4093fc3e2165Swdenk
40946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
4095fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
4096c609719bSwdenk
4097f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
4098f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
4099f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
4100f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
4101f5675aa5SRon Madrid		space for already greatly restricted images, including but not
4102f5675aa5SRon Madrid		limited to NAND_SPL configurations.
4103f5675aa5SRon Madrid
4104b2b92f53SSimon Glass- CONFIG_DISPLAY_BOARDINFO
4105b2b92f53SSimon Glass		Display information about the board that U-Boot is running on
4106b2b92f53SSimon Glass		when U-Boot starts up. The board function checkboard() is called
4107b2b92f53SSimon Glass		to do this.
4108b2b92f53SSimon Glass
4109e2e3e2b1SSimon Glass- CONFIG_DISPLAY_BOARDINFO_LATE
4110e2e3e2b1SSimon Glass		Similar to the previous option, but display this information
4111e2e3e2b1SSimon Glass		later, once stdio is running and output goes to the LCD, if
4112e2e3e2b1SSimon Glass		present.
4113e2e3e2b1SSimon Glass
4114c609719bSwdenkLow Level (hardware related) configuration options:
4115dc7c9a1aSwdenk---------------------------------------------------
4116c609719bSwdenk
41176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
4118c609719bSwdenk		Cache Line Size of the CPU.
4119c609719bSwdenk
41206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
4121c609719bSwdenk		Default address of the IMMR after system reset.
41222535d602Swdenk
41232535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
41242535d602Swdenk		and RPXsuper) to be able to adjust the position of
41252535d602Swdenk		the IMMR register after a reset.
4126c609719bSwdenk
4127e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
4128e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
4129e46fedfeSTimur Tabi		PowerPC SOCs.
4130e46fedfeSTimur Tabi
4131e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
4132e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
4133e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
4134e46fedfeSTimur Tabi
4135e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
4136e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
4137e46fedfeSTimur Tabi
4138e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
4139e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
4140e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
4141e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
4142e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
4143e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
4144e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
4145e46fedfeSTimur Tabi
4146e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
4147e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
4148e46fedfeSTimur Tabi
4149e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
4150e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
4151e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
4152e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
4153e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
4154e46fedfeSTimur Tabi
4155e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
4156e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
4157e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
4158e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
4159e46fedfeSTimur Tabi
4160e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
4161e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
4162e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
4163e46fedfeSTimur Tabi
41647f6c2cbcSwdenk- Floppy Disk Support:
41656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
41667f6c2cbcSwdenk
41677f6c2cbcSwdenk		the default drive number (default value 0)
41687f6c2cbcSwdenk
41696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
41707f6c2cbcSwdenk
417111ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
41727f6c2cbcSwdenk		(default value 1)
41737f6c2cbcSwdenk
41746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
41757f6c2cbcSwdenk
41767f6c2cbcSwdenk		defines the offset of register from address. It
41777f6c2cbcSwdenk		depends on which part of the data bus is connected to
417811ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
41797f6c2cbcSwdenk
41806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
41816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
41827f6c2cbcSwdenk		default value.
41837f6c2cbcSwdenk
41846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
41857f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
41867f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
41877f6c2cbcSwdenk		source code. It is used to make hardware dependant
41887f6c2cbcSwdenk		initializations.
41897f6c2cbcSwdenk
41900abddf82SMacpaul Lin- CONFIG_IDE_AHB:
41910abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
41920abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
41930abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
41940abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
41950abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
41960abddf82SMacpaul Lin		is requierd.
41970abddf82SMacpaul Lin
41986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
419925d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
420025d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
4201c609719bSwdenk
42026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
4203c609719bSwdenk
42047152b1d0Swdenk		Start address of memory area that can be used for
4205c609719bSwdenk		initial data and stack; please note that this must be
4206c609719bSwdenk		writable memory that is working WITHOUT special
4207c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
4208c609719bSwdenk		will become available only after programming the
4209c609719bSwdenk		memory controller and running certain initialization
4210c609719bSwdenk		sequences.
4211c609719bSwdenk
4212c609719bSwdenk		U-Boot uses the following memory types:
4213c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
4214c609719bSwdenk		- MPC824X: data cache
4215c609719bSwdenk		- PPC4xx:  data cache
4216c609719bSwdenk
42176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
4218c609719bSwdenk
4219c609719bSwdenk		Offset of the initial data structure in the memory
42206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
42216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
4222c609719bSwdenk		data is located at the end of the available space
4223553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
42246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
42256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
42266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
4227c609719bSwdenk
4228c609719bSwdenk	Note:
4229c609719bSwdenk		On the MPC824X (or other systems that use the data
4230c609719bSwdenk		cache for initial memory) the address chosen for
42316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
4232c609719bSwdenk		point to an otherwise UNUSED address space between
4233c609719bSwdenk		the top of RAM and the start of the PCI space.
4234c609719bSwdenk
42356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
4236c609719bSwdenk
42376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
4238c609719bSwdenk
42396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
4240c609719bSwdenk
42416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
4242c609719bSwdenk
42436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
4244c609719bSwdenk
42456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
4246c609719bSwdenk
42476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
4248c609719bSwdenk		SDRAM timing
4249c609719bSwdenk
42506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
4251c609719bSwdenk		periodic timer for refresh
4252c609719bSwdenk
42536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
4254c609719bSwdenk
42556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
42566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
42576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
42586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
4259c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
4260c609719bSwdenk
4261c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
42626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
42636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
4264c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
4265c609719bSwdenk
42666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
42676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
4268c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
4269c609719bSwdenk		Prescaler definitions (SDRAM timing)
4270c609719bSwdenk
42716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
4272c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
4273c609719bSwdenk		define relocation offset in DPRAM [DSP2]
4274c609719bSwdenk
42756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
4276b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
4277b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
4278b423d055SHeiko Schocher
42796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
4280c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
4281c609719bSwdenk		define relocation offset in DPRAM [SCC4]
4282c609719bSwdenk
42836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
4284c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
4285c609719bSwdenk		wrong setting might damage your board. Read
4286c609719bSwdenk		doc/README.MBX before setting this variable!
4287c609719bSwdenk
42886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
4289ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
4290ea909b76Swdenk		(Power On Self Tests). This definition overrides
4291ea909b76Swdenk		#define'd default value in commproc.h resp.
4292ea909b76Swdenk		cpm_8260.h.
4293ea909b76Swdenk
42946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
42956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
42966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
42976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
42986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
42996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
43006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
43016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
4302a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
43035d232d0eSwdenk
43049cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
43059cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
43069cacf4fcSDirk Eibach		required.
43079cacf4fcSDirk Eibach
430869fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
430969fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
431069fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
431169fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
431269fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
431369fd2d3bSAndrew Sharp		by coreboot or similar.
431469fd2d3bSAndrew Sharp
4315842033e6SGabor Juhos- CONFIG_PCI_INDIRECT_BRIDGE:
4316842033e6SGabor Juhos		Enable support for indirect PCI bridges.
4317842033e6SGabor Juhos
4318a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
4319a09b9b68SKumar Gala		Chip has SRIO or not
4320a09b9b68SKumar Gala
4321a09b9b68SKumar Gala- CONFIG_SRIO1:
4322a09b9b68SKumar Gala		Board has SRIO 1 port available
4323a09b9b68SKumar Gala
4324a09b9b68SKumar Gala- CONFIG_SRIO2:
4325a09b9b68SKumar Gala		Board has SRIO 2 port available
4326a09b9b68SKumar Gala
4327c8b28152SLiu Gang- CONFIG_SRIO_PCIE_BOOT_MASTER
4328c8b28152SLiu Gang		Board can support master function for Boot from SRIO and PCIE
4329c8b28152SLiu Gang
4330a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
4331a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
4332a09b9b68SKumar Gala
4333a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
4334a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
4335a09b9b68SKumar Gala
4336a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
4337a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
4338a09b9b68SKumar Gala
433966bd1846SFabio Estevam- CONFIG_SYS_NAND_BUSWIDTH_16BIT
434066bd1846SFabio Estevam		Defined to tell the NAND controller that the NAND chip is using
434166bd1846SFabio Estevam		a 16 bit bus.
434266bd1846SFabio Estevam		Not all NAND drivers use this symbol.
4343a430e916SFabio Estevam		Example of drivers that use it:
434466bd1846SFabio Estevam		- drivers/mtd/nand/ndfc.c
4345a430e916SFabio Estevam		- drivers/mtd/nand/mxc_nand.c
4346eced4626SAlex Waterman
4347eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
4348eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
4349eced4626SAlex Waterman		a default value will be used.
4350eced4626SAlex Waterman
4351bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
4352218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
4353218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
4354218ca724SWolfgang Denk
4355bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
4356bb99ad6dSBen Warren		I2C address of the SPD EEPROM
4357bb99ad6dSBen Warren
43586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
4359218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
4360218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
4361218ca724SWolfgang Denk		to something your driver can deal with.
4362bb99ad6dSBen Warren
43631b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
43641b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
43651b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
43661b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
43671b3e3c4fSYork Sun		header files or board specific files.
43681b3e3c4fSYork Sun
43696f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
43706f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
43716f5e1dc5SYork Sun
43726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
4373218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
4374218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
43752ad6b513STimur Tabi
4376c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
4377c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
4378c26e454dSwdenk
4379c26e454dSwdenk- CONFIG_FEC[12]_PHY
4380c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
43816e592385Swdenk		to the given FEC; i. e.
4382c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
4383c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
4384c26e454dSwdenk
4385c26e454dSwdenk		When set to -1, means to probe for first available.
4386c26e454dSwdenk
4387c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
4388c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
4389c26e454dSwdenk		(so program the FEC to ignore it).
4390c26e454dSwdenk
4391c26e454dSwdenk- CONFIG_RMII
4392c26e454dSwdenk		Enable RMII mode for all FECs.
4393c26e454dSwdenk		Note that this is a global option, we can't
4394c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
4395c26e454dSwdenk
43965cf91d6bSwdenk- CONFIG_CRC32_VERIFY
43975cf91d6bSwdenk		Add a verify option to the crc32 command.
43985cf91d6bSwdenk		The syntax is:
43995cf91d6bSwdenk
44005cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
44015cf91d6bSwdenk
44025cf91d6bSwdenk		Where address/count indicate a memory area
44035cf91d6bSwdenk		and crc32 is the correct crc32 which the
44045cf91d6bSwdenk		area should have.
44055cf91d6bSwdenk
440656523f12Swdenk- CONFIG_LOOPW
440756523f12Swdenk		Add the "loopw" memory command. This only takes effect if
4408602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
440956523f12Swdenk
44107b466641Sstroese- CONFIG_MX_CYCLIC
44117b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
44127b466641Sstroese		"md/mw" commands.
44137b466641Sstroese		Examples:
44147b466641Sstroese
44157b466641Sstroese		=> mdc.b 10 4 500
44167b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
44177b466641Sstroese
44187b466641Sstroese		=> mwc.l 100 12345678 10
44197b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
44207b466641Sstroese
44217b466641Sstroese		This only takes effect if the memory commands are activated
4422602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
44237b466641Sstroese
44248aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
4425afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
4426e03f3169SWolfgang Denk		low level initializations (like setting up the memory
4427e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
4428e03f3169SWolfgang Denk		relocate itself into RAM.
44298aa1a2d1Swdenk
4430e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
4431e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
4432e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
4433e03f3169SWolfgang Denk		these initializations itself.
44348aa1a2d1Swdenk
4435401bb30bSAneesh V- CONFIG_SPL_BUILD
4436df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
4437df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
4438df81238bSMagnus Lilja		compiling a NAND SPL.
4439400558b5Swdenk
44403aa29de0SYing Zhang- CONFIG_TPL_BUILD
44413aa29de0SYing Zhang		Modifies the behaviour of start.S  when compiling a loader
44423aa29de0SYing Zhang		that is executed after the SPL and before the actual U-Boot.
44433aa29de0SYing Zhang		It is loaded by the SPL.
44443aa29de0SYing Zhang
44455df572f0SYing Zhang- CONFIG_SYS_MPC85XX_NO_RESETVEC
44465df572f0SYing Zhang		Only for 85xx systems. If this variable is specified, the section
44475df572f0SYing Zhang		.resetvec is not kept and the section .bootpg is placed in the
44485df572f0SYing Zhang		previous 4k of the .text section.
44495df572f0SYing Zhang
44504213fc29SSimon Glass- CONFIG_ARCH_MAP_SYSMEM
44514213fc29SSimon Glass		Generally U-Boot (and in particular the md command) uses
44524213fc29SSimon Glass		effective address. It is therefore not necessary to regard
44534213fc29SSimon Glass		U-Boot address as virtual addresses that need to be translated
44544213fc29SSimon Glass		to physical addresses. However, sandbox requires this, since
44554213fc29SSimon Glass		it maintains its own little RAM buffer which contains all
44564213fc29SSimon Glass		addressable memory. This option causes some memory accesses
44574213fc29SSimon Glass		to be mapped through map_sysmem() / unmap_sysmem().
44584213fc29SSimon Glass
4459d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
4460d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
4461d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
4462d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
4463d8834a13SMatthias Weisser		conditions but may increase the binary size.
4464d8834a13SMatthias Weisser
4465588a13f7SSimon Glass- CONFIG_X86_RESET_VECTOR
4466588a13f7SSimon Glass		If defined, the x86 reset vector code is included. This is not
4467588a13f7SSimon Glass		needed when U-Boot is running from Coreboot.
4468b16f521aSGabe Black
4469fc33705eSMark Jackson- CONFIG_SYS_MPUCLK
4470fc33705eSMark Jackson		Defines the MPU clock speed (in MHz).
4471fc33705eSMark Jackson
4472fc33705eSMark Jackson		NOTE : currently only supported on AM335x platforms.
44735b5ece9eSGabe Black
447416678eb4SHeiko Schocher- CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC:
447516678eb4SHeiko Schocher		Enables the RTC32K OSC on AM33xx based plattforms
447616678eb4SHeiko Schocher
4477f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
4478f2717b47STimur Tabi-----------------------------------
4479f2717b47STimur Tabi
4480f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4481f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
4482f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
4483f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
4484f2717b47STimur Tabiwithin that device.
4485f2717b47STimur Tabi
4486f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
4487f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
4488f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4489f2717b47STimur Tabi	is also specified.
4490f2717b47STimur Tabi
4491f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
4492f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
4493f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
4494f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
4495f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
4496f2717b47STimur Tabi
4497f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
4498f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4499f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
4500f2717b47STimur Tabi	virtual address in NOR flash.
4501f2717b47STimur Tabi
4502f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
4503f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
4504f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4505f2717b47STimur Tabi
4506f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
4507f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
4508f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4509f2717b47STimur Tabi
4510f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4511f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
4512f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4513f2717b47STimur Tabi
4514292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4515292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
4516292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4517fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4518fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
4519fc54c7faSLiu Gang	master's memory space.
4520f2717b47STimur Tabi
4521c609719bSwdenkBuilding the Software:
4522c609719bSwdenk======================
4523c609719bSwdenk
4524218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
4525218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
4526218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
4527218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
4528218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4529218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
4530c609719bSwdenk
4531218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
4532218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
4533218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
4534218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
4535218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
4536c609719bSwdenk
4537218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
4538218ca724SWolfgang Denk	$ export CROSS_COMPILE
4539c609719bSwdenk
45402f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
45412f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
45422f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
45432f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
45442f8d396bSPeter Tyser
45452f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
45462f8d396bSPeter Tyser
45472f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
45482f8d396bSPeter Tyser      be executed on computers running Windows.
45492f8d396bSPeter Tyser
4550c609719bSwdenkU-Boot is intended to be simple to build. After installing the
4551c609719bSwdenksources you must configure U-Boot for one specific board type. This
4552c609719bSwdenkis done by typing:
4553c609719bSwdenk
4554c609719bSwdenk	make NAME_config
4555c609719bSwdenk
4556218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
45574d675ae6SMichael Jonesrations; see boards.cfg for supported names.
455854387ac9Swdenk
4559c609719bSwdenkNote: for some board special configuration names may exist; check if
4560c609719bSwdenk      additional information is available from the board vendor; for
45612729af9dSwdenk      instance, the TQM823L systems are available without (standard)
45622729af9dSwdenk      or with LCD support. You can select such additional "features"
456311ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
4564c609719bSwdenk
45652729af9dSwdenk      make TQM823L_config
45662729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
4567c609719bSwdenk
4568c609719bSwdenk      make TQM823L_LCD_config
4569c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
4570c609719bSwdenk
4571c609719bSwdenk      etc.
4572c609719bSwdenk
4573c609719bSwdenk
4574c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
45757152b1d0Swdenkimages ready for download to / installation on your system:
4576c609719bSwdenk
4577c609719bSwdenk- "u-boot.bin" is a raw binary image
4578c609719bSwdenk- "u-boot" is an image in ELF binary format
4579c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
4580c609719bSwdenk
4581baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
4582baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
4583baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
4584baf31249SMarian Balakowicz
4585baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
4586baf31249SMarian Balakowicz
4587baf31249SMarian Balakowicz	make O=/tmp/build distclean
4588baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
4589baf31249SMarian Balakowicz	make O=/tmp/build all
4590baf31249SMarian Balakowicz
4591baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
4592baf31249SMarian Balakowicz
4593baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4594baf31249SMarian Balakowicz	make distclean
4595baf31249SMarian Balakowicz	make NAME_config
4596baf31249SMarian Balakowicz	make all
4597baf31249SMarian Balakowicz
4598baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
4599baf31249SMarian Balakowiczvariable.
4600baf31249SMarian Balakowicz
4601c609719bSwdenk
4602c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
4603c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
4604c609719bSwdenknative "make".
4605c609719bSwdenk
4606c609719bSwdenk
4607c609719bSwdenkIf the system board that you have is not listed, then you will need
4608c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
4609c609719bSwdenksteps:
4610c609719bSwdenk
4611c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
46124d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
46134d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
4614c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
461585ec0bccSwdenk    files you need. In your board directory, you will need at least
461685ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
461785ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
461885ec0bccSwdenk    your board
4619c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
4620c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
462185ec0bccSwdenk4.  Run "make <board>_config" with your new name.
4622c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
4623c609719bSwdenk    to be installed on your target system.
462485ec0bccSwdenk6.  Debug and solve any problems that might arise.
4625c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
4626c609719bSwdenk
4627c609719bSwdenk
4628c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
4629c609719bSwdenk==============================================================
4630c609719bSwdenk
4631c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
4632c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
4633c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
4634c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
4635218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
4636c609719bSwdenk
4637c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
4638c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
4639c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
4640c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
4641c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
46427152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
4643218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
4644218ca724SWolfgang Denkyou can type
4645c609719bSwdenk
4646c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
4647c609719bSwdenk
4648c609719bSwdenkor to build on a native PowerPC system you can type
4649c609719bSwdenk
4650c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
4651c609719bSwdenk
4652218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
4653218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
4654218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
4655218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
4656218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
4657218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
4658218ca724SWolfgang Denkvariable. For example:
4659baf31249SMarian Balakowicz
4660baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4661baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
4662baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
4663baf31249SMarian Balakowicz
4664218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
4665218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
4666218ca724SWolfgang Denkduring the whole build process.
4667baf31249SMarian Balakowicz
4668baf31249SMarian Balakowicz
4669c609719bSwdenkSee also "U-Boot Porting Guide" below.
4670c609719bSwdenk
4671c609719bSwdenk
4672c609719bSwdenkMonitor Commands - Overview:
4673c609719bSwdenk============================
4674c609719bSwdenk
4675c609719bSwdenkgo	- start application at address 'addr'
4676c609719bSwdenkrun	- run commands in an environment variable
4677c609719bSwdenkbootm	- boot application image from memory
4678c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
467944f074c7SMarek Vasutbootz   - boot zImage from memory
4680c609719bSwdenktftpboot- boot image via network using TFTP protocol
4681c609719bSwdenk	       and env variables "ipaddr" and "serverip"
4682c609719bSwdenk	       (and eventually "gatewayip")
46831fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
4684c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
4685c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
4686c609719bSwdenkloads	- load S-Record file over serial line
4687c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
4688c609719bSwdenkmd	- memory display
4689c609719bSwdenkmm	- memory modify (auto-incrementing)
4690c609719bSwdenknm	- memory modify (constant address)
4691c609719bSwdenkmw	- memory write (fill)
4692c609719bSwdenkcp	- memory copy
4693c609719bSwdenkcmp	- memory compare
4694c609719bSwdenkcrc32	- checksum calculation
46950f89c54bSPeter Tyseri2c	- I2C sub-system
4696c609719bSwdenksspi	- SPI utility commands
4697c609719bSwdenkbase	- print or set address offset
4698c609719bSwdenkprintenv- print environment variables
4699c609719bSwdenksetenv	- set environment variables
4700c609719bSwdenksaveenv - save environment variables to persistent storage
4701c609719bSwdenkprotect - enable or disable FLASH write protection
4702c609719bSwdenkerase	- erase FLASH memory
4703c609719bSwdenkflinfo	- print FLASH memory information
470410635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
4705c609719bSwdenkbdinfo	- print Board Info structure
4706c609719bSwdenkiminfo	- print header information for application image
4707c609719bSwdenkconinfo - print console devices and informations
4708c609719bSwdenkide	- IDE sub-system
4709c609719bSwdenkloop	- infinite loop on address range
471056523f12Swdenkloopw	- infinite write loop on address range
4711c609719bSwdenkmtest	- simple RAM test
4712c609719bSwdenkicache	- enable or disable instruction cache
4713c609719bSwdenkdcache	- enable or disable data cache
4714c609719bSwdenkreset	- Perform RESET of the CPU
4715c609719bSwdenkecho	- echo args to console
4716c609719bSwdenkversion - print monitor version
4717c609719bSwdenkhelp	- print online help
4718c609719bSwdenk?	- alias for 'help'
4719c609719bSwdenk
4720c609719bSwdenk
4721c609719bSwdenkMonitor Commands - Detailed Description:
4722c609719bSwdenk========================================
4723c609719bSwdenk
4724c609719bSwdenkTODO.
4725c609719bSwdenk
4726c609719bSwdenkFor now: just type "help <command>".
4727c609719bSwdenk
4728c609719bSwdenk
4729c609719bSwdenkEnvironment Variables:
4730c609719bSwdenk======================
4731c609719bSwdenk
4732c609719bSwdenkU-Boot supports user configuration using Environment Variables which
4733c609719bSwdenkcan be made persistent by saving to Flash memory.
4734c609719bSwdenk
4735c609719bSwdenkEnvironment Variables are set using "setenv", printed using
4736c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
4737c609719bSwdenkwithout a value can be used to delete a variable from the
4738c609719bSwdenkenvironment. As long as you don't save the environment you are
4739c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
4740c609719bSwdenkenvironment is erased by accident, a default environment is provided.
4741c609719bSwdenk
4742c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
4743c96f86eeSWolfgang Denk
4744c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
4745c609719bSwdenk
4746c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
4747c609719bSwdenk
4748c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
4749c609719bSwdenk
4750c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
4751c609719bSwdenk
4752c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
4753c609719bSwdenk
4754c609719bSwdenk  bootfile	- Name of the image to load with TFTP
4755c609719bSwdenk
47567d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
47577d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
47587d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
47597d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
47607d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
47617d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
4762c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4763c3624e6eSGrant Likely		  bootm_mapsize.
4764c3624e6eSGrant Likely
4765c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
4766c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
4767c3624e6eSGrant Likely		  defines the size of the memory region starting at base
4768c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
4769c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
4770c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
4771c3624e6eSGrant Likely		  used otherwise.
47727d721e34SBartlomiej Sieka
47737d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
47747d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
47757d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
47767d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
47777d721e34SBartlomiej Sieka		  environment variable.
47787d721e34SBartlomiej Sieka
47794bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
47804bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
47814bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
47824bae9090SBartlomiej Sieka
4783c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
4784c609719bSwdenk		  "bootp" will just load perform a lookup of the
4785c609719bSwdenk		  configuration from the BOOTP server, but not try to
4786c609719bSwdenk		  load any image using TFTP
4787c609719bSwdenk
4788c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
4789c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
4790c609719bSwdenk		  be automatically started (by internally calling
4791c609719bSwdenk		  "bootm")
4792c609719bSwdenk
47934a6fd34bSwdenk		  If set to "no", a standalone image passed to the
47944a6fd34bSwdenk		  "bootm" command will be copied to the load address
47954a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
47964a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
47974a6fd34bSwdenk		  data.
47984a6fd34bSwdenk
4799a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
4800a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
4801fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
4802fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
4803fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
4804fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
4805fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
4806fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
4807fa34f6b2SShawn Guo		  access it during the boot procedure.
4808fa34f6b2SShawn Guo
4809a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
4810a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
4811a28afca5SDavid A. Long		  to work it must reside in writable memory, have
4812a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
4813a28afca5SDavid A. Long		  add the information it needs into it, and the memory
4814a28afca5SDavid A. Long		  must be accessible by the kernel.
4815a28afca5SDavid A. Long
4816eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
4817eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
4818eea63e05SSimon Glass		  defined.
4819eea63e05SSimon Glass
482017ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
482117ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
482217ea1177Swdenk		  mode (400kHZ). This environment variable is used in
482317ea1177Swdenk		  initialization code. So, for changes to be effective
482417ea1177Swdenk		  it must be saved and board must be reset.
482517ea1177Swdenk
4826c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
4827c609719bSwdenk		  If this variable is not set, initrd images will be
4828c609719bSwdenk		  copied to the highest possible address in RAM; this
4829c609719bSwdenk		  is usually what you want since it allows for
4830c609719bSwdenk		  maximum initrd size. If for some reason you want to
4831c609719bSwdenk		  make sure that the initrd image is loaded below the
48326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4833c609719bSwdenk		  variable to a value of "no" or "off" or "0".
4834c609719bSwdenk		  Alternatively, you can set it to a maximum upper
4835c609719bSwdenk		  address to use (U-Boot will still check that it
4836c609719bSwdenk		  does not overwrite the U-Boot stack and data).
4837c609719bSwdenk
4838c609719bSwdenk		  For instance, when you have a system with 16 MB
48397152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
4840c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
4841c609719bSwdenk		  the "bootargs" variable. However, now you must make
48427152b1d0Swdenk		  sure that the initrd image is placed in the first
4843c609719bSwdenk		  12 MB as well - this can be done with
4844c609719bSwdenk
4845c609719bSwdenk		  setenv initrd_high 00c00000
4846c609719bSwdenk
484738b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
484838b99261Swdenk		  indication to U-Boot that all addresses are legal
484938b99261Swdenk		  for the Linux kernel, including addresses in flash
485038b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
485138b99261Swdenk		  ramdisk at all. This may be useful to reduce the
485238b99261Swdenk		  boot time on your system, but requires that this
485338b99261Swdenk		  feature is supported by your Linux kernel.
485438b99261Swdenk
4855c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
4856c609719bSwdenk
4857c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
4858dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
4859c609719bSwdenk
4860c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
4861c609719bSwdenk
4862c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
4863c609719bSwdenk
4864c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
4865c609719bSwdenk
4866c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
4867c609719bSwdenk
4868c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
4869c609719bSwdenk
4870e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
4871a3d991bdSwdenk
4872e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
4873e2a53458SMike Frysinger		  For example you can do the following
4874a3d991bdSwdenk
487548690d80SHeiko Schocher		  => setenv ethact FEC
487648690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
487748690d80SHeiko Schocher		  => setenv ethact SCC
487848690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
4879a3d991bdSwdenk
4880e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
4881e1692577SMatthias Fuchs		  available network interfaces.
4882e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
4883e1692577SMatthias Fuchs
4884a3d991bdSwdenk  netretry	- When set to "no" each network operation will
4885a3d991bdSwdenk		  either succeed or fail without retrying.
48866e592385Swdenk		  When set to "once" the network operation will
48876e592385Swdenk		  fail when all the available network interfaces
48886e592385Swdenk		  are tried once without success.
4889a3d991bdSwdenk		  Useful on scripts which control the retry operation
4890a3d991bdSwdenk		  themselves.
4891a3d991bdSwdenk
4892b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
4893a1cf027aSJean-Christophe PLAGNIOL-VILLARD
48948d51aacdSSimon Glass  silent_linux  - If set then linux will be told to boot silently, by
48958d51aacdSSimon Glass		  changing the console to be empty. If "yes" it will be
48968d51aacdSSimon Glass		  made silent. If "no" it will not be made silent. If
48978d51aacdSSimon Glass		  unset, then it will be made silent if the U-Boot console
48988d51aacdSSimon Glass		  is silent.
48998d51aacdSSimon Glass
490028cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
4901ecb0ccd9SWolfgang Denk		  UDP source port.
4902ecb0ccd9SWolfgang Denk
490328cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
490428cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
490528cb9375SWolfgang Denk
4906c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
4907c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
4908c96f86eeSWolfgang Denk
4909c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
4910c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
4911c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
4912c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
4913c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
4914c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
4915c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
4916c96f86eeSWolfgang Denk
4917a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
491811ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
4919a3d991bdSwdenk		  VLAN tagged frames.
4920c609719bSwdenk
4921dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4922dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4923dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4924dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4925dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4926dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4927dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4928dc0b7b0eSJason Hobbs
4929dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4930dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4931dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4932dc0b7b0eSJason Hobbs
4933dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4934dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4935dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4936dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4937dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4938dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4939dc0b7b0eSJason Hobbs
4940c609719bSwdenkThe following environment variables may be used and automatically
4941c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4942c609719bSwdenkdepending the information provided by your boot server:
4943c609719bSwdenk
4944c609719bSwdenk  bootfile	- see above
4945c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4946fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4947c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4948c609719bSwdenk  hostname	- Target hostname
4949c609719bSwdenk  ipaddr	- see above
4950c609719bSwdenk  netmask	- Subnet Mask
4951c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4952c609719bSwdenk  serverip	- see above
4953c609719bSwdenk
4954c609719bSwdenk
4955c609719bSwdenkThere are two special Environment Variables:
4956c609719bSwdenk
4957c609719bSwdenk  serial#	- contains hardware identification information such
4958c609719bSwdenk		  as type string and/or serial number
4959c609719bSwdenk  ethaddr	- Ethernet address
4960c609719bSwdenk
4961c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4962c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4963c609719bSwdenkonce they have been set once.
4964c609719bSwdenk
4965c609719bSwdenk
4966c1551ea8SstroeseFurther special Environment Variables:
4967c1551ea8Sstroese
4968c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4969c1551ea8Sstroese		  with the "version" command. This variable is
4970c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4971c1551ea8Sstroese
4972c1551ea8Sstroese
4973c609719bSwdenkPlease note that changes to some configuration parameters may take
4974c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4975c609719bSwdenk
4976c609719bSwdenk
4977170ab110SJoe HershbergerCallback functions for environment variables:
4978170ab110SJoe Hershberger---------------------------------------------
4979170ab110SJoe Hershberger
4980170ab110SJoe HershbergerFor some environment variables, the behavior of u-boot needs to change
4981170ab110SJoe Hershbergerwhen their values are changed.  This functionailty allows functions to
4982170ab110SJoe Hershbergerbe associated with arbitrary variables.  On creation, overwrite, or
4983170ab110SJoe Hershbergerdeletion, the callback will provide the opportunity for some side
4984170ab110SJoe Hershbergereffect to happen or for the change to be rejected.
4985170ab110SJoe Hershberger
4986170ab110SJoe HershbergerThe callbacks are named and associated with a function using the
4987170ab110SJoe HershbergerU_BOOT_ENV_CALLBACK macro in your board or driver code.
4988170ab110SJoe Hershberger
4989170ab110SJoe HershbergerThese callbacks are associated with variables in one of two ways.  The
4990170ab110SJoe Hershbergerstatic list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4991170ab110SJoe Hershbergerin the board configuration to a string that defines a list of
4992170ab110SJoe Hershbergerassociations.  The list must be in the following format:
4993170ab110SJoe Hershberger
4994170ab110SJoe Hershberger	entry = variable_name[:callback_name]
4995170ab110SJoe Hershberger	list = entry[,list]
4996170ab110SJoe Hershberger
4997170ab110SJoe HershbergerIf the callback name is not specified, then the callback is deleted.
4998170ab110SJoe HershbergerSpaces are also allowed anywhere in the list.
4999170ab110SJoe Hershberger
5000170ab110SJoe HershbergerCallbacks can also be associated by defining the ".callbacks" variable
5001170ab110SJoe Hershbergerwith the same list format above.  Any association in ".callbacks" will
5002170ab110SJoe Hershbergeroverride any association in the static list. You can define
5003170ab110SJoe HershbergerCONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
5004170ab110SJoe Hershberger".callbacks" envirnoment variable in the default or embedded environment.
5005170ab110SJoe Hershberger
5006170ab110SJoe Hershberger
5007f07771ccSwdenkCommand Line Parsing:
5008f07771ccSwdenk=====================
5009f07771ccSwdenk
5010f07771ccSwdenkThere are two different command line parsers available with U-Boot:
50117152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
5012f07771ccSwdenk
5013f07771ccSwdenkOld, simple command line parser:
5014f07771ccSwdenk--------------------------------
5015f07771ccSwdenk
5016f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
5017f07771ccSwdenk- several commands on one line, separated by ';'
5018fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
5019f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
5020f07771ccSwdenk  for example:
5021fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
5022f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
5023f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
5024f07771ccSwdenk
5025f07771ccSwdenkHush shell:
5026f07771ccSwdenk-----------
5027f07771ccSwdenk
5028f07771ccSwdenk- similar to Bourne shell, with control structures like
5029f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
5030f07771ccSwdenk  until...do...done, ...
5031f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
5032f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
5033f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
5034f07771ccSwdenk  command
5035f07771ccSwdenk
5036f07771ccSwdenkGeneral rules:
5037f07771ccSwdenk--------------
5038f07771ccSwdenk
5039f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
5040f07771ccSwdenk    command) contains several commands separated by semicolon, and
5041f07771ccSwdenk    one of these commands fails, then the remaining commands will be
5042f07771ccSwdenk    executed anyway.
5043f07771ccSwdenk
5044f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
504511ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
5046f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
5047f07771ccSwdenk    variables are not executed.
5048f07771ccSwdenk
5049c609719bSwdenkNote for Redundant Ethernet Interfaces:
5050c609719bSwdenk=======================================
5051c609719bSwdenk
505211ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
5053c609719bSwdenksuch configurations and is capable of automatic selection of a
50547152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
5055c609719bSwdenk
5056c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
5057c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
5058c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
5059c609719bSwdenk
5060c609719bSwdenkIf the network interface stores some valid MAC address (for instance
5061c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
5062c609719bSwdenkding setting in the environment; if the corresponding environment
5063c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
5064c609719bSwdenk
5065c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
5066c609719bSwdenk  environment, the SROM's address is used.
5067c609719bSwdenk
5068c609719bSwdenko If there is no valid address in the SROM, and a definition in the
5069c609719bSwdenk  environment exists, then the value from the environment variable is
5070c609719bSwdenk  used.
5071c609719bSwdenk
5072c609719bSwdenko If both the SROM and the environment contain a MAC address, and
5073c609719bSwdenk  both addresses are the same, this MAC address is used.
5074c609719bSwdenk
5075c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
5076c609719bSwdenk  addresses differ, the value from the environment is used and a
5077c609719bSwdenk  warning is printed.
5078c609719bSwdenk
5079c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
5080c609719bSwdenk  is raised.
5081c609719bSwdenk
5082ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
5083ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
5084ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
5085ecee9324SBen WarrenThe naming convention is as follows:
5086ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
5087c609719bSwdenk
5088c609719bSwdenkImage Formats:
5089c609719bSwdenk==============
5090c609719bSwdenk
50913310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
50923310c549SMarian Balakowiczimages in two formats:
50933310c549SMarian Balakowicz
50943310c549SMarian BalakowiczNew uImage format (FIT)
50953310c549SMarian Balakowicz-----------------------
50963310c549SMarian Balakowicz
50973310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
50983310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
50993310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
51003310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
51013310c549SMarian Balakowicz
51023310c549SMarian Balakowicz
51033310c549SMarian BalakowiczOld uImage format
51043310c549SMarian Balakowicz-----------------
51053310c549SMarian Balakowicz
51063310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
51073310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
51083310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
5109c609719bSwdenk
5110c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
5111c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
5112f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
5113f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
5114f5ed9e39SPeter Tyser  INTEGRITY).
51157b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
5116afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
5117afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
5118c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
5119c609719bSwdenk* Load Address
5120c609719bSwdenk* Entry Point
5121c609719bSwdenk* Image Name
5122c609719bSwdenk* Image Timestamp
5123c609719bSwdenk
5124c609719bSwdenkThe header is marked by a special Magic Number, and both the header
5125c609719bSwdenkand the data portions of the image are secured against corruption by
5126c609719bSwdenkCRC32 checksums.
5127c609719bSwdenk
5128c609719bSwdenk
5129c609719bSwdenkLinux Support:
5130c609719bSwdenk==============
5131c609719bSwdenk
5132c609719bSwdenkAlthough U-Boot should support any OS or standalone application
51337152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
5134c609719bSwdenkU-Boot.
5135c609719bSwdenk
5136c609719bSwdenkU-Boot includes many features that so far have been part of some
5137c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
5138c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
5139c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
51407152b1d0Swdenkserves several purposes:
5141c609719bSwdenk
5142c609719bSwdenk- the same features can be used for other OS or standalone
5143c609719bSwdenk  applications (for instance: using compressed images to reduce the
5144c609719bSwdenk  Flash memory footprint)
5145c609719bSwdenk
5146c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
51477152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
5148c609719bSwdenk
5149c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
5150c609719bSwdenk  images; of course this also means that different kernel images can
5151c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
5152c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
5153c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
5154c609719bSwdenk  software is easier now.
5155c609719bSwdenk
5156c609719bSwdenk
5157c609719bSwdenkLinux HOWTO:
5158c609719bSwdenk============
5159c609719bSwdenk
5160c609719bSwdenkPorting Linux to U-Boot based systems:
5161c609719bSwdenk---------------------------------------
5162c609719bSwdenk
5163c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
5164c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
5165c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
5166c609719bSwdenkLinux :-).
5167c609719bSwdenk
5168a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
5169c609719bSwdenk
5170c609719bSwdenkJust make sure your machine specific header file (for instance
5171c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
51721dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
51731dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
51746d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
5175c609719bSwdenk
5176c609719bSwdenk
5177c609719bSwdenkConfiguring the Linux kernel:
5178c609719bSwdenk-----------------------------
5179c609719bSwdenk
5180c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
5181c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
5182c609719bSwdenk
5183c609719bSwdenk
5184c609719bSwdenkBuilding a Linux Image:
5185c609719bSwdenk-----------------------
5186c609719bSwdenk
518724ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
518824ee89b9Swdenknot used. If you use recent kernel source, a new build target
518924ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
519024ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
519124ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
519224ee89b9Swdenk100% compatible format.
5193c609719bSwdenk
5194c609719bSwdenkExample:
5195c609719bSwdenk
5196c609719bSwdenk	make TQM850L_config
5197c609719bSwdenk	make oldconfig
5198c609719bSwdenk	make dep
519924ee89b9Swdenk	make uImage
5200c609719bSwdenk
520124ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
520224ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
520324ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
5204c609719bSwdenk
520524ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
520624ee89b9Swdenk
520724ee89b9Swdenk* convert the kernel into a raw binary image:
520824ee89b9Swdenk
520924ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
521024ee89b9Swdenk				 -R .note -R .comment \
521124ee89b9Swdenk				 -S vmlinux linux.bin
521224ee89b9Swdenk
521324ee89b9Swdenk* compress the binary image:
521424ee89b9Swdenk
521524ee89b9Swdenk	gzip -9 linux.bin
521624ee89b9Swdenk
521724ee89b9Swdenk* package compressed binary image for U-Boot:
521824ee89b9Swdenk
521924ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
522024ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
522124ee89b9Swdenk		-d linux.bin.gz uImage
522224ee89b9Swdenk
522324ee89b9Swdenk
522424ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
522524ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
522624ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
522724ee89b9Swdenkbyte header containing information about target architecture,
522824ee89b9Swdenkoperating system, image type, compression method, entry points, time
522924ee89b9Swdenkstamp, CRC32 checksums, etc.
523024ee89b9Swdenk
523124ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
523224ee89b9Swdenkprint the header information, or to build new images.
5233c609719bSwdenk
5234c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
5235c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
5236c609719bSwdenkchecksum verification:
5237c609719bSwdenk
5238c609719bSwdenk	tools/mkimage -l image
5239c609719bSwdenk	  -l ==> list image header information
5240c609719bSwdenk
5241c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
5242c609719bSwdenkfrom a "data file" which is used as image payload:
5243c609719bSwdenk
5244c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
5245c609719bSwdenk		      -n name -d data_file image
5246c609719bSwdenk	  -A ==> set architecture to 'arch'
5247c609719bSwdenk	  -O ==> set operating system to 'os'
5248c609719bSwdenk	  -T ==> set image type to 'type'
5249c609719bSwdenk	  -C ==> set compression type 'comp'
5250c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
5251c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
5252c609719bSwdenk	  -n ==> set image name to 'name'
5253c609719bSwdenk	  -d ==> use image data from 'datafile'
5254c609719bSwdenk
525569459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
525669459791Swdenkaddress (0x00000000), but the entry point address depends on the
525769459791Swdenkkernel version:
5258c609719bSwdenk
5259c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
526024ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
5261c609719bSwdenk
5262c609719bSwdenkSo a typical call to build a U-Boot image would read:
5263c609719bSwdenk
526424ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
526524ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
5266a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
526724ee89b9Swdenk	> examples/uImage.TQM850L
526824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5269c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5270c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5271c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5272c609719bSwdenk	Load Address: 0x00000000
527324ee89b9Swdenk	Entry Point:  0x00000000
5274c609719bSwdenk
5275c609719bSwdenkTo verify the contents of the image (or check for corruption):
5276c609719bSwdenk
527724ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
527824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5279c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5280c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5281c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5282c609719bSwdenk	Load Address: 0x00000000
528324ee89b9Swdenk	Entry Point:  0x00000000
5284c609719bSwdenk
5285c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
5286c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
5287c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
5288c609719bSwdenkneed to be uncompressed:
5289c609719bSwdenk
5290a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
529124ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
529224ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
5293a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
529424ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
529524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5296c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5297c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
5298c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
5299c609719bSwdenk	Load Address: 0x00000000
530024ee89b9Swdenk	Entry Point:  0x00000000
5301c609719bSwdenk
5302c609719bSwdenk
5303c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
5304c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
5305c609719bSwdenk
5306c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
5307c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
5308c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
5309c609719bSwdenk	Image Name:   Simple Ramdisk Image
5310c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
5311c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
5312c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
5313c609719bSwdenk	Load Address: 0x00000000
5314c609719bSwdenk	Entry Point:  0x00000000
5315c609719bSwdenk
5316a804b5ceSGuilherme Maciel FerreiraThe "dumpimage" is a tool to disassemble images built by mkimage. Its "-i"
5317a804b5ceSGuilherme Maciel Ferreiraoption performs the converse operation of the mkimage's second form (the "-d"
5318a804b5ceSGuilherme Maciel Ferreiraoption). Given an image built by mkimage, the dumpimage extracts a "data file"
5319a804b5ceSGuilherme Maciel Ferreirafrom the image:
5320a804b5ceSGuilherme Maciel Ferreira
5321a804b5ceSGuilherme Maciel Ferreira	tools/dumpimage -i image -p position data_file
5322a804b5ceSGuilherme Maciel Ferreira	  -i ==> extract from the 'image' a specific 'data_file', \
5323a804b5ceSGuilherme Maciel Ferreira	   indexed by 'position'
5324a804b5ceSGuilherme Maciel Ferreira
5325c609719bSwdenk
5326c609719bSwdenkInstalling a Linux Image:
5327c609719bSwdenk-------------------------
5328c609719bSwdenk
5329c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
5330c609719bSwdenkyou must convert the image to S-Record format:
5331c609719bSwdenk
5332c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
5333c609719bSwdenk
5334c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
5335c609719bSwdenkimage header, so the resulting S-Record file will be relative to
5336c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
5337c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
5338c609719bSwdenkcommand.
5339c609719bSwdenk
5340c609719bSwdenkExample: install the image to address 0x40100000 (which on the
5341c609719bSwdenkTQM8xxL is in the first Flash bank):
5342c609719bSwdenk
5343c609719bSwdenk	=> erase 40100000 401FFFFF
5344c609719bSwdenk
5345c609719bSwdenk	.......... done
5346c609719bSwdenk	Erased 8 sectors
5347c609719bSwdenk
5348c609719bSwdenk	=> loads 40100000
5349c609719bSwdenk	## Ready for S-Record download ...
5350c609719bSwdenk	~>examples/image.srec
5351c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5352c609719bSwdenk	...
5353c609719bSwdenk	15989 15990 15991 15992
5354c609719bSwdenk	[file transfer complete]
5355c609719bSwdenk	[connected]
5356c609719bSwdenk	## Start Addr = 0x00000000
5357c609719bSwdenk
5358c609719bSwdenk
5359c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
5360c609719bSwdenkthis includes a checksum verification so you can be sure no data
5361c609719bSwdenkcorruption happened:
5362c609719bSwdenk
5363c609719bSwdenk	=> imi 40100000
5364c609719bSwdenk
5365c609719bSwdenk	## Checking Image at 40100000 ...
5366c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5367c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5368c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5369c609719bSwdenk	   Load Address: 00000000
5370c609719bSwdenk	   Entry Point:	 0000000c
5371c609719bSwdenk	   Verifying Checksum ... OK
5372c609719bSwdenk
5373c609719bSwdenk
5374c609719bSwdenkBoot Linux:
5375c609719bSwdenk-----------
5376c609719bSwdenk
5377c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
5378c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
5379c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
5380c609719bSwdenkparameters. You can check and modify this variable using the
5381c609719bSwdenk"printenv" and "setenv" commands:
5382c609719bSwdenk
5383c609719bSwdenk
5384c609719bSwdenk	=> printenv bootargs
5385c609719bSwdenk	bootargs=root=/dev/ram
5386c609719bSwdenk
5387c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5388c609719bSwdenk
5389c609719bSwdenk	=> printenv bootargs
5390c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5391c609719bSwdenk
5392c609719bSwdenk	=> bootm 40020000
5393c609719bSwdenk	## Booting Linux kernel at 40020000 ...
5394c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
5395c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5396c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
5397c609719bSwdenk	   Load Address: 00000000
5398c609719bSwdenk	   Entry Point:	 0000000c
5399c609719bSwdenk	   Verifying Checksum ... OK
5400c609719bSwdenk	   Uncompressing Kernel Image ... OK
5401c609719bSwdenk	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
5402c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5403c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5404c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5405c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5406c609719bSwdenk	...
5407c609719bSwdenk
540811ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
54097152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
5410c609719bSwdenkformat!) to the "bootm" command:
5411c609719bSwdenk
5412c609719bSwdenk	=> imi 40100000 40200000
5413c609719bSwdenk
5414c609719bSwdenk	## Checking Image at 40100000 ...
5415c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5416c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5417c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5418c609719bSwdenk	   Load Address: 00000000
5419c609719bSwdenk	   Entry Point:	 0000000c
5420c609719bSwdenk	   Verifying Checksum ... OK
5421c609719bSwdenk
5422c609719bSwdenk	## Checking Image at 40200000 ...
5423c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5424c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5425c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5426c609719bSwdenk	   Load Address: 00000000
5427c609719bSwdenk	   Entry Point:	 00000000
5428c609719bSwdenk	   Verifying Checksum ... OK
5429c609719bSwdenk
5430c609719bSwdenk	=> bootm 40100000 40200000
5431c609719bSwdenk	## Booting Linux kernel at 40100000 ...
5432c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5433c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5434c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5435c609719bSwdenk	   Load Address: 00000000
5436c609719bSwdenk	   Entry Point:	 0000000c
5437c609719bSwdenk	   Verifying Checksum ... OK
5438c609719bSwdenk	   Uncompressing Kernel Image ... OK
5439c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
5440c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5441c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5442c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5443c609719bSwdenk	   Load Address: 00000000
5444c609719bSwdenk	   Entry Point:	 00000000
5445c609719bSwdenk	   Verifying Checksum ... OK
5446c609719bSwdenk	   Loading Ramdisk ... OK
5447c609719bSwdenk	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
5448c609719bSwdenk	Boot arguments: root=/dev/ram
5449c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5450c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5451c609719bSwdenk	...
5452c609719bSwdenk	RAMDISK: Compressed image found at block 0
5453c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
5454c609719bSwdenk
5455c609719bSwdenk	bash#
5456c609719bSwdenk
54570267768eSMatthew McClintockBoot Linux and pass a flat device tree:
54580267768eSMatthew McClintock-----------
54590267768eSMatthew McClintock
54600267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
54610267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
54620267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
54630267768eSMatthew McClintockflat device tree:
54640267768eSMatthew McClintock
54650267768eSMatthew McClintock=> print oftaddr
54660267768eSMatthew McClintockoftaddr=0x300000
54670267768eSMatthew McClintock=> print oft
54680267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
54690267768eSMatthew McClintock=> tftp $oftaddr $oft
54700267768eSMatthew McClintockSpeed: 1000, full duplex
54710267768eSMatthew McClintockUsing TSEC0 device
54720267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
54730267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
54740267768eSMatthew McClintockLoad address: 0x300000
54750267768eSMatthew McClintockLoading: #
54760267768eSMatthew McClintockdone
54770267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
54780267768eSMatthew McClintock=> tftp $loadaddr $bootfile
54790267768eSMatthew McClintockSpeed: 1000, full duplex
54800267768eSMatthew McClintockUsing TSEC0 device
54810267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
54820267768eSMatthew McClintockFilename 'uImage'.
54830267768eSMatthew McClintockLoad address: 0x200000
54840267768eSMatthew McClintockLoading:############
54850267768eSMatthew McClintockdone
54860267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
54870267768eSMatthew McClintock=> print loadaddr
54880267768eSMatthew McClintockloadaddr=200000
54890267768eSMatthew McClintock=> print oftaddr
54900267768eSMatthew McClintockoftaddr=0x300000
54910267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
54920267768eSMatthew McClintock## Booting image at 00200000 ...
54930267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
54940267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
54950267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
54960267768eSMatthew McClintock   Load Address: 00000000
54970267768eSMatthew McClintock   Entry Point:	 00000000
54980267768eSMatthew McClintock   Verifying Checksum ... OK
54990267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
55000267768eSMatthew McClintockBooting using flat device tree at 0x300000
55010267768eSMatthew McClintockUsing MPC85xx ADS machine description
55020267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
55030267768eSMatthew McClintock[snip]
55040267768eSMatthew McClintock
55050267768eSMatthew McClintock
55066069ff26SwdenkMore About U-Boot Image Types:
55076069ff26Swdenk------------------------------
55086069ff26Swdenk
55096069ff26SwdenkU-Boot supports the following image types:
55106069ff26Swdenk
55116069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
55126069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
55136069ff26Swdenk	well) you can continue to work in U-Boot after return from
55146069ff26Swdenk	the Standalone Program.
55156069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
55166069ff26Swdenk	will take over control completely. Usually these programs
55176069ff26Swdenk	will install their own set of exception handlers, device
55186069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
55196069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
55206069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
55216069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
55226069ff26Swdenk	being started.
55236069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
55246069ff26Swdenk	(Linux) kernel image and one or more data images like
55256069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
55266069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
55276069ff26Swdenk	server provides just a single image file, but you want to get
55286069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
55296069ff26Swdenk
55306069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
55316069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
55326069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
55336069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
55346069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
55356069ff26Swdenk	a multiple of 4 bytes).
55366069ff26Swdenk
55376069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
55386069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
55396069ff26Swdenk	flash memory.
55406069ff26Swdenk
55416069ff26Swdenk   "Script files" are command sequences that will be executed by
55426069ff26Swdenk	U-Boot's command interpreter; this feature is especially
55436069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
55446069ff26Swdenk	as command interpreter.
55456069ff26Swdenk
554644f074c7SMarek VasutBooting the Linux zImage:
554744f074c7SMarek Vasut-------------------------
554844f074c7SMarek Vasut
554944f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
555044f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
555144f074c7SMarek Vasutas the syntax of "bootm" command.
555244f074c7SMarek Vasut
55538ac28563STom RiniNote, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
5554017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
5555017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
5556017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
5557017e1f3fSMarek Vasut
5558c609719bSwdenk
5559c609719bSwdenkStandalone HOWTO:
5560c609719bSwdenk=================
5561c609719bSwdenk
5562c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
5563c609719bSwdenkrun "standalone" applications, which can use some resources of
5564c609719bSwdenkU-Boot like console I/O functions or interrupt services.
5565c609719bSwdenk
5566c609719bSwdenkTwo simple examples are included with the sources:
5567c609719bSwdenk
5568c609719bSwdenk"Hello World" Demo:
5569c609719bSwdenk-------------------
5570c609719bSwdenk
5571c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
5572c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
5573c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
5574c609719bSwdenklike that:
5575c609719bSwdenk
5576c609719bSwdenk	=> loads
5577c609719bSwdenk	## Ready for S-Record download ...
5578c609719bSwdenk	~>examples/hello_world.srec
5579c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5580c609719bSwdenk	[file transfer complete]
5581c609719bSwdenk	[connected]
5582c609719bSwdenk	## Start Addr = 0x00040004
5583c609719bSwdenk
5584c609719bSwdenk	=> go 40004 Hello World! This is a test.
5585c609719bSwdenk	## Starting application at 0x00040004 ...
5586c609719bSwdenk	Hello World
5587c609719bSwdenk	argc = 7
5588c609719bSwdenk	argv[0] = "40004"
5589c609719bSwdenk	argv[1] = "Hello"
5590c609719bSwdenk	argv[2] = "World!"
5591c609719bSwdenk	argv[3] = "This"
5592c609719bSwdenk	argv[4] = "is"
5593c609719bSwdenk	argv[5] = "a"
5594c609719bSwdenk	argv[6] = "test."
5595c609719bSwdenk	argv[7] = "<NULL>"
5596c609719bSwdenk	Hit any key to exit ...
5597c609719bSwdenk
5598c609719bSwdenk	## Application terminated, rc = 0x0
5599c609719bSwdenk
5600c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
5601c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
5602c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
5603c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
5604c609719bSwdenkcharacter, but this is just a demo program. The application can be
5605c609719bSwdenkcontrolled by the following keys:
5606c609719bSwdenk
5607c609719bSwdenk	? - print current values og the CPM Timer registers
5608c609719bSwdenk	b - enable interrupts and start timer
5609c609719bSwdenk	e - stop timer and disable interrupts
5610c609719bSwdenk	q - quit application
5611c609719bSwdenk
5612c609719bSwdenk	=> loads
5613c609719bSwdenk	## Ready for S-Record download ...
5614c609719bSwdenk	~>examples/timer.srec
5615c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5616c609719bSwdenk	[file transfer complete]
5617c609719bSwdenk	[connected]
5618c609719bSwdenk	## Start Addr = 0x00040004
5619c609719bSwdenk
5620c609719bSwdenk	=> go 40004
5621c609719bSwdenk	## Starting application at 0x00040004 ...
5622c609719bSwdenk	TIMERS=0xfff00980
5623c609719bSwdenk	Using timer 1
5624c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5625c609719bSwdenk
5626c609719bSwdenkHit 'b':
5627c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
5628c609719bSwdenk	Enabling timer
5629c609719bSwdenkHit '?':
5630c609719bSwdenk	[q, b, e, ?] ........
5631c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5632c609719bSwdenkHit '?':
5633c609719bSwdenk	[q, b, e, ?] .
5634c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5635c609719bSwdenkHit '?':
5636c609719bSwdenk	[q, b, e, ?] .
5637c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5638c609719bSwdenkHit '?':
5639c609719bSwdenk	[q, b, e, ?] .
5640c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5641c609719bSwdenkHit 'e':
5642c609719bSwdenk	[q, b, e, ?] ...Stopping timer
5643c609719bSwdenkHit 'q':
5644c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
5645c609719bSwdenk
5646c609719bSwdenk
564785ec0bccSwdenkMinicom warning:
564885ec0bccSwdenk================
564985ec0bccSwdenk
56507152b1d0SwdenkOver time, many people have reported problems when trying to use the
565185ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
565285ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
5653f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
565485ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
5655e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
5656e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5657e53515a2SKarl O. Pincfor help with kermit.
5658e53515a2SKarl O. Pinc
565985ec0bccSwdenk
566052f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
566152f52c14Swdenkconfiguration to your "File transfer protocols" section:
566252f52c14Swdenk
566352f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
566452f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
566552f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
566652f52c14Swdenk
566752f52c14Swdenk
5668c609719bSwdenkNetBSD Notes:
5669c609719bSwdenk=============
5670c609719bSwdenk
5671c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
5672c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
5673c609719bSwdenk
5674c609719bSwdenkBuilding requires a cross environment; it is known to work on
5675c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5676c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
5677c609719bSwdenkNote that the cross-powerpc package does not install include files;
5678c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
5679c609719bSwdenkmissing.  This file has to be installed and patched manually:
5680c609719bSwdenk
5681c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
5682c609719bSwdenk	# mkdir powerpc
5683c609719bSwdenk	# ln -s powerpc machine
5684c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5685c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
5686c609719bSwdenk
5687c609719bSwdenkNative builds *don't* work due to incompatibilities between native
5688c609719bSwdenkand U-Boot include files.
5689c609719bSwdenk
5690c609719bSwdenkBooting assumes that (the first part of) the image booted is a
5691c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
5692c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
5693c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
56942a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5695c609719bSwdenk
5696c609719bSwdenk
5697c609719bSwdenkImplementation Internals:
5698c609719bSwdenk=========================
5699c609719bSwdenk
5700c609719bSwdenkThe following is not intended to be a complete description of every
5701c609719bSwdenkimplementation detail. However, it should help to understand the
5702c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
5703c609719bSwdenkhardware.
5704c609719bSwdenk
5705c609719bSwdenk
5706c609719bSwdenkInitial Stack, Global Data:
5707c609719bSwdenk---------------------------
5708c609719bSwdenk
5709c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
5710c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
5711c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
5712c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
5713c609719bSwdenkis not initialized as zero. To be able to get a C environment working
5714c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
5715c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
5716c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
5717c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
5718c609719bSwdenklocked as (mis-) used as memory, etc.
5719c609719bSwdenk
57207152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
57210668236bSWolfgang Denk	U-Boot mailing list:
572243d9616cSwdenk
572343d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
572443d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
572543d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
572643d9616cSwdenk	...
572743d9616cSwdenk
572843d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
572943d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
573043d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
573143d9616cSwdenk	is that the cache is being used as a temporary supply of
573243d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
573311ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
573443d9616cSwdenk	can see how this works by studying the cache architecture and
573543d9616cSwdenk	operation in the architecture and processor-specific manuals.
573643d9616cSwdenk
573743d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
573843d9616cSwdenk	is another option for the system designer to use as an
573911ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
574043d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
574143d9616cSwdenk	board designers haven't used it for something that would
574243d9616cSwdenk	cause you grief during the initial boot! It is frequently not
574343d9616cSwdenk	used.
574443d9616cSwdenk
57456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
574643d9616cSwdenk	with your processor/board/system design. The default value
574743d9616cSwdenk	you will find in any recent u-boot distribution in
57488a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
574943d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
575043d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
575143d9616cSwdenk	that are supposed to respond to that address! That code in
575243d9616cSwdenk	start.S has been around a while and should work as is when
575343d9616cSwdenk	you get the config right.
575443d9616cSwdenk
575543d9616cSwdenk	-Chris Hallinan
575643d9616cSwdenk	DS4.COM, Inc.
575743d9616cSwdenk
5758c609719bSwdenkIt is essential to remember this, since it has some impact on the C
5759c609719bSwdenkcode for the initialization procedures:
5760c609719bSwdenk
5761c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
5762c609719bSwdenk  to write it.
5763c609719bSwdenk
576411ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
5765c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
57667152b1d0Swdenk  zation is performed later (when relocating to RAM).
5767c609719bSwdenk
5768c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
5769c609719bSwdenk  that.
5770c609719bSwdenk
5771c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
5772c609719bSwdenknormal global data to share information beween the code. But it
5773c609719bSwdenkturned out that the implementation of U-Boot can be greatly
5774c609719bSwdenksimplified by making a global data structure (gd_t) available to all
5775c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
5776c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
5777c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
5778c609719bSwdenkplace a pointer (gd) to the global data into a register which we
5779c609719bSwdenkreserve for this purpose.
5780c609719bSwdenk
57817152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
5782c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
5783c609719bSwdenkGCC's implementation.
5784c609719bSwdenk
5785c609719bSwdenkFor PowerPC, the following registers have specific use:
5786c609719bSwdenk	R1:	stack pointer
5787e7670f6cSWolfgang Denk	R2:	reserved for system use
5788c609719bSwdenk	R3-R4:	parameter passing and return values
5789c609719bSwdenk	R5-R10: parameter passing
5790c609719bSwdenk	R13:	small data area pointer
5791c609719bSwdenk	R30:	GOT pointer
5792c609719bSwdenk	R31:	frame pointer
5793c609719bSwdenk
5794e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
5795e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
5796e6bee808SJoakim Tjernlund	going back and forth between asm and C)
5797c609719bSwdenk
5798e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
5799c609719bSwdenk
5800c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
5801c609719bSwdenk    address of the global data structure is known at compile time),
5802c609719bSwdenk    but it turned out that reserving a register results in somewhat
5803c609719bSwdenk    smaller code - although the code savings are not that big (on
5804c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
5805c609719bSwdenk    624 text + 127 data).
5806c609719bSwdenk
5807c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
58084c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
58094c58eb55SMike Frysinger
5810c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
58114c58eb55SMike Frysinger
5812c609719bSwdenkOn ARM, the following registers are used:
5813c609719bSwdenk
5814c609719bSwdenk	R0:	function argument word/integer result
5815c609719bSwdenk	R1-R3:	function argument word
581612eba1b4SJeroen Hofstee	R9:	platform specific
581712eba1b4SJeroen Hofstee	R10:	stack limit (used only if stack checking is enabled)
5818c609719bSwdenk	R11:	argument (frame) pointer
5819c609719bSwdenk	R12:	temporary workspace
5820c609719bSwdenk	R13:	stack pointer
5821c609719bSwdenk	R14:	link register
5822c609719bSwdenk	R15:	program counter
5823c609719bSwdenk
582412eba1b4SJeroen Hofstee    ==> U-Boot will use R9 to hold a pointer to the global data
582512eba1b4SJeroen Hofstee
582612eba1b4SJeroen Hofstee    Note: on ARM, only R_ARM_RELATIVE relocations are supported.
5827c609719bSwdenk
58280df01fd3SThomas ChouOn Nios II, the ABI is documented here:
58290df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
58300df01fd3SThomas Chou
58310df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
58320df01fd3SThomas Chou
58330df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
58340df01fd3SThomas Chou    to access small data sections, so gp is free.
58350df01fd3SThomas Chou
5836afc1ce82SMacpaul LinOn NDS32, the following registers are used:
5837afc1ce82SMacpaul Lin
5838afc1ce82SMacpaul Lin	R0-R1:	argument/return
5839afc1ce82SMacpaul Lin	R2-R5:	argument
5840afc1ce82SMacpaul Lin	R15:	temporary register for assembler
5841afc1ce82SMacpaul Lin	R16:	trampoline register
5842afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
5843afc1ce82SMacpaul Lin	R29:	global pointer (GP)
5844afc1ce82SMacpaul Lin	R30:	link register (LP)
5845afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
5846afc1ce82SMacpaul Lin	PC:	program counter (PC)
5847afc1ce82SMacpaul Lin
5848afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
5849afc1ce82SMacpaul Lin
5850d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5851d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
5852c609719bSwdenk
5853c609719bSwdenkMemory Management:
5854c609719bSwdenk------------------
5855c609719bSwdenk
5856c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
5857c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
5858c609719bSwdenk
5859c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
5860c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
5861c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
5862c609719bSwdenkphysical memory banks.
5863c609719bSwdenk
5864c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
5865c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5866c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
5867c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
58686d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5869c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
5870c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
5871c609719bSwdenk
5872c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
5873c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
5874c609719bSwdenk
5875c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
5876c609719bSwdenkthis:
5877c609719bSwdenk
5878c609719bSwdenk	0x0000 0000	Exception Vector code
5879c609719bSwdenk	      :
5880c609719bSwdenk	0x0000 1FFF
5881c609719bSwdenk	0x0000 2000	Free for Application Use
5882c609719bSwdenk	      :
5883c609719bSwdenk	      :
5884c609719bSwdenk
5885c609719bSwdenk	      :
5886c609719bSwdenk	      :
5887c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
5888c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
5889c609719bSwdenk	0x00FC 0000	Malloc Arena
5890c609719bSwdenk	      :
5891c609719bSwdenk	0x00FD FFFF
5892c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
5893c609719bSwdenk	...		eventually: LCD or video framebuffer
5894c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
5895c609719bSwdenk	0x00FF FFFF	[End of RAM]
5896c609719bSwdenk
5897c609719bSwdenk
5898c609719bSwdenkSystem Initialization:
5899c609719bSwdenk----------------------
5900c609719bSwdenk
5901c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
590211ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
5903c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
59047152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
5905c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
5906c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
5907c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
5908c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
5909c609719bSwdenkthe caches and the SIU.
5910c609719bSwdenk
5911c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
5912c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
5913c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5914c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5915c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
5916c609719bSwdenksimple memory test is run that determines the size of the SDRAM
5917c609719bSwdenkbanks.
5918c609719bSwdenk
5919c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
59207152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
5921c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
5922c609719bSwdenk0x00000000, with any additional banks following immediately to create
5923c609719bSwdenkcontiguous memory starting from 0.
5924c609719bSwdenk
5925c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
5926c609719bSwdenkand allocates memory for use by malloc() and for the global Board
5927c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
5928c609719bSwdenkpages, and the final stack is set up.
5929c609719bSwdenk
5930c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
5931c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
5932c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
5933c609719bSwdenknew address in RAM.
5934c609719bSwdenk
5935c609719bSwdenk
5936c609719bSwdenkU-Boot Porting Guide:
5937c609719bSwdenk----------------------
5938c609719bSwdenk
5939c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
59406aff3115Swdenklist, October 2002]
5941c609719bSwdenk
5942c609719bSwdenk
5943c609719bSwdenkint main(int argc, char *argv[])
5944c609719bSwdenk{
5945c609719bSwdenk	sighandler_t no_more_time;
5946c609719bSwdenk
5947c609719bSwdenk	signal(SIGALRM, no_more_time);
5948c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5949c609719bSwdenk
5950c609719bSwdenk	if (available_money > available_manpower) {
59516c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
5952c609719bSwdenk		return 0;
5953c609719bSwdenk	}
5954c609719bSwdenk
5955c609719bSwdenk	Download latest U-Boot source;
5956c609719bSwdenk
59570668236bSWolfgang Denk	Subscribe to u-boot mailing list;
59586aff3115Swdenk
59596c3fef28SJerry Van Baren	if (clueless)
5960c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
5961c609719bSwdenk
5962c609719bSwdenk	while (learning) {
5963c609719bSwdenk		Read the README file in the top level directory;
59647cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
59656c3fef28SJerry Van Baren		Read applicable doc/*.README;
5966c609719bSwdenk		Read the source, Luke;
59676c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5968c609719bSwdenk	}
5969c609719bSwdenk
59706c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
59716c3fef28SJerry Van Baren		Buy a BDI3000;
59726c3fef28SJerry Van Baren	else
5973c609719bSwdenk		Add a lot of aggravation and time;
5974c609719bSwdenk
59756c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
59766c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
59776c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
59786c3fef28SJerry Van Baren	} else {
5979c609719bSwdenk		Create your own board support subdirectory;
59806c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
59816c3fef28SJerry Van Baren	}
59826c3fef28SJerry Van Baren	Edit new board/<myboard> files
59836c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5984c609719bSwdenk
59856c3fef28SJerry Van Baren	while (!accepted) {
5986c609719bSwdenk		while (!running) {
5987c609719bSwdenk			do {
5988c609719bSwdenk				Add / modify source code;
5989c609719bSwdenk			} until (compiles);
5990c609719bSwdenk			Debug;
5991c609719bSwdenk			if (clueless)
5992c609719bSwdenk				email("Hi, I am having problems...");
5993c609719bSwdenk		}
59946c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
59956c3fef28SJerry Van Baren		if (reasonable critiques)
59966c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
59976c3fef28SJerry Van Baren		else
59986c3fef28SJerry Van Baren			Defend code as written;
59996c3fef28SJerry Van Baren	}
6000c609719bSwdenk
6001c609719bSwdenk	return 0;
6002c609719bSwdenk}
6003c609719bSwdenk
6004c609719bSwdenkvoid no_more_time (int sig)
6005c609719bSwdenk{
6006c609719bSwdenk      hire_a_guru();
6007c609719bSwdenk}
6008c609719bSwdenk
6009c609719bSwdenk
6010c609719bSwdenkCoding Standards:
6011c609719bSwdenk-----------------
6012c609719bSwdenk
6013c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
60142c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
60157ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
6016c609719bSwdenk
60172c051651SDetlev ZundelSource files originating from a different project (for example the
60182c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
60192c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
60202c051651SDetlev Zundelsources.
60212c051651SDetlev Zundel
60222c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
60232c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
60242c051651SDetlev Zundelin your code.
6025c609719bSwdenk
6026c178d3daSwdenkPlease also stick to the following formatting rules:
6027180d3f74Swdenk- remove any trailing white space
60287ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
6029180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
60307ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
6031180d3f74Swdenk- do not add trailing empty lines to source files
6032180d3f74Swdenk
6033c609719bSwdenkSubmissions which do not conform to the standards may be returned
6034c609719bSwdenkwith a request to reformat the changes.
6035c609719bSwdenk
6036c609719bSwdenk
6037c609719bSwdenkSubmitting Patches:
6038c609719bSwdenk-------------------
6039c609719bSwdenk
6040c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
6041c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
6042c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
6043c609719bSwdenk
60440d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
6045218ca724SWolfgang Denk
60460668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
60470668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
60480668236bSWolfgang Denk
6049c609719bSwdenkWhen you send a patch, please include the following information with
6050c609719bSwdenkit:
6051c609719bSwdenk
6052c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
6053c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
6054c609719bSwdenk  patch actually fixes something.
6055c609719bSwdenk
6056c609719bSwdenk* For new features: a description of the feature and your
6057c609719bSwdenk  implementation.
6058c609719bSwdenk
6059c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
6060c609719bSwdenk
6061c609719bSwdenk* For major contributions, your entry to the CREDITS file
6062c609719bSwdenk
606327af930eSAlbert ARIBAUD* When you add support for a new board, don't forget to add a
606427af930eSAlbert ARIBAUD  maintainer e-mail address to the boards.cfg file, too.
6065c609719bSwdenk
6066c609719bSwdenk* If your patch adds new configuration options, don't forget to
6067c609719bSwdenk  document these in the README file.
6068c609719bSwdenk
6069218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
6070218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
60717ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
6072218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
6073218ca724SWolfgang Denk  with some other mail clients.
6074c609719bSwdenk
6075218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
6076218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
6077218ca724SWolfgang Denk  GNU diff.
60786dff5529Swdenk
6079218ca724SWolfgang Denk  The current directory when running this command shall be the parent
6080218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
6081218ca724SWolfgang Denk  your patch includes sufficient directory information for the
6082218ca724SWolfgang Denk  affected files).
6083218ca724SWolfgang Denk
6084218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
6085218ca724SWolfgang Denk  and compressed attachments must not be used.
6086c609719bSwdenk
608752f52c14Swdenk* If one logical set of modifications affects or creates several
608852f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
608952f52c14Swdenk
609052f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
609152f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
609252f52c14Swdenk
609352f52c14Swdenk
6094c609719bSwdenkNotes:
6095c609719bSwdenk
6096c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
6097c609719bSwdenk  source tree and make sure that no errors or warnings are reported
6098c609719bSwdenk  for any of the boards.
6099c609719bSwdenk
6100c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
6101c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
6102c609719bSwdenk  returned with a request to re-formatting / split it.
6103c609719bSwdenk
6104c609719bSwdenk* If you modify existing code, make sure that your new code does not
6105c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
6106c609719bSwdenk  When adding new features, these should compile conditionally only
6107c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
6108c609719bSwdenk  disabled must not need more memory than the old code without your
6109c609719bSwdenk  modification.
611090dc6704Swdenk
61110668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
61120668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
61130668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
61140668236bSWolfgang Denk  bigger than the size limit should be avoided.
6115