xref: /openbmc/u-boot/README (revision eda0ba38a8dfd2572089bd229a027d497c340158)
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      /ixp		Files specific to Intel XScale IXP CPUs
1458d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1468d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1478d321b81SPeter Tyser    /lib		Architecture specific library files
1488d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1498d321b81SPeter Tyser    /cpu		CPU specific files
1508d321b81SPeter Tyser    /lib		Architecture specific library files
1518d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1528d321b81SPeter Tyser    /cpu		CPU specific files
1538d321b81SPeter Tyser    /lib		Architecture specific library files
1548d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1558d321b81SPeter Tyser    /cpu		CPU specific files
1568d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1578d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1588d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1598d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1608d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1618d321b81SPeter Tyser    /lib		Architecture specific library files
1628d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1638d321b81SPeter Tyser    /cpu		CPU specific files
1648d321b81SPeter Tyser    /lib		Architecture specific library files
1658d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1668d321b81SPeter Tyser    /cpu		CPU specific files
16792bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
16880421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1698d321b81SPeter Tyser    /lib		Architecture specific library files
170afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
171afc1ce82SMacpaul Lin    /cpu		CPU specific files
172afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
173afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1748d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1758d321b81SPeter Tyser    /cpu		CPU specific files
1768d321b81SPeter Tyser    /lib		Architecture specific library files
17733c7731bSRobert P. J. Day  /openrisc		Files generic to OpenRISC architecture
17833c7731bSRobert P. J. Day    /cpu		CPU specific files
17933c7731bSRobert P. J. Day    /lib		Architecture specific library files
180a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1818d321b81SPeter Tyser    /cpu		CPU specific files
1828d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1838d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1848d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1858d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1868d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
1878d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
1888d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
1898d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
1908d321b81SPeter Tyser    /lib		Architecture specific library files
1918d321b81SPeter Tyser  /sh			Files generic to SH architecture
1928d321b81SPeter Tyser    /cpu		CPU specific files
1938d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
1948d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
1958d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
1968d321b81SPeter Tyser    /lib		Architecture specific library files
1978d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
1988d321b81SPeter Tyser    /cpu		CPU specific files
1998d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2008d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2018d321b81SPeter Tyser    /lib		Architecture specific library files
20233c7731bSRobert P. J. Day  /x86			Files generic to x86 architecture
20333c7731bSRobert P. J. Day    /cpu		CPU specific files
20433c7731bSRobert P. J. Day    /lib		Architecture specific library files
2058d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2068d321b81SPeter Tyser/board			Board dependent files
2078d321b81SPeter Tyser/common			Misc architecture independent functions
2088d321b81SPeter Tyser/disk			Code for disk drive partition handling
2098d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2108d321b81SPeter Tyser/drivers		Commonly used device drivers
21133c7731bSRobert P. J. Day/dts			Contains Makefile for building internal U-Boot fdt.
2128d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2138d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2148d321b81SPeter Tyser/include		Header Files
2158d321b81SPeter Tyser/lib			Files generic to all architectures
2168d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2178d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2188d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2198d321b81SPeter Tyser/net			Networking code
2208d321b81SPeter Tyser/post			Power On Self Test
22133c7731bSRobert P. J. Day/spl			Secondary Program Loader framework
2228d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
223c609719bSwdenk
224c609719bSwdenkSoftware Configuration:
225c609719bSwdenk=======================
226c609719bSwdenk
227c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
228c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
229c609719bSwdenk
230c609719bSwdenkThere are two classes of configuration variables:
231c609719bSwdenk
232c609719bSwdenk* Configuration _OPTIONS_:
233c609719bSwdenk  These are selectable by the user and have names beginning with
234c609719bSwdenk  "CONFIG_".
235c609719bSwdenk
236c609719bSwdenk* Configuration _SETTINGS_:
237c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
238c609719bSwdenk  you don't know what you're doing; they have names beginning with
2396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
240c609719bSwdenk
241c609719bSwdenkLater we will add a configuration tool - probably similar to or even
242c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
243c609719bSwdenkdo the configuration by hand, which means creating some symbolic
244c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
245c609719bSwdenkas an example here.
246c609719bSwdenk
247c609719bSwdenk
248c609719bSwdenkSelection of Processor Architecture and Board Type:
249c609719bSwdenk---------------------------------------------------
250c609719bSwdenk
251c609719bSwdenkFor all supported boards there are ready-to-use default
252c609719bSwdenkconfigurations available; just type "make <board_name>_config".
253c609719bSwdenk
254c609719bSwdenkExample: For a TQM823L module type:
255c609719bSwdenk
256c609719bSwdenk	cd u-boot
257c609719bSwdenk	make TQM823L_config
258c609719bSwdenk
25911ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
260c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
261c609719bSwdenkdirectory according to the instructions in cogent/README.
262c609719bSwdenk
263c609719bSwdenk
264c609719bSwdenkConfiguration Options:
265c609719bSwdenk----------------------
266c609719bSwdenk
267c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
268c609719bSwdenksuch information is kept in a configuration file
269c609719bSwdenk"include/configs/<board_name>.h".
270c609719bSwdenk
271c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
272c609719bSwdenk"include/configs/TQM823L.h".
273c609719bSwdenk
274c609719bSwdenk
2757f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2767f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2777f6c2cbcSwdenkbuild a config tool - later.
2787f6c2cbcSwdenk
2797f6c2cbcSwdenk
280c609719bSwdenkThe following options need to be configured:
281c609719bSwdenk
2822628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
283c609719bSwdenk
2842628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2856ccec449SWolfgang Denk
2866ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
28709ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
288c609719bSwdenk
289c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
290c609719bSwdenk		Define exactly one of
291c609719bSwdenk		CONFIG_CMA286_60_OLD
292c609719bSwdenk--- FIXME --- not tested yet:
293c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
294c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
295c609719bSwdenk
296c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
297c609719bSwdenk		Define exactly one of
298c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
299c609719bSwdenk
300c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
301c609719bSwdenk		Define one or more of
302c609719bSwdenk		CONFIG_CMA302
303c609719bSwdenk
304c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
305c609719bSwdenk		Define one or more of
306c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
30711ccc33fSMarcel Ziswiler					  the LCD display every second with
308c609719bSwdenk					  a "rotator" |\-/|\-/
309c609719bSwdenk
3102535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3112535d602Swdenk		CONFIG_ADSTYPE
3122535d602Swdenk		Possible values are:
3136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3172535d602Swdenk
318cf946c6dSLei Wen- Marvell Family Member
319cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
320cf946c6dSLei Wen					  multiple fs option at one time
321cf946c6dSLei Wen					  for marvell soc family
322cf946c6dSLei Wen
323c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
324c609719bSwdenk		Define exactly one of
325c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
326c609719bSwdenk
32711ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
32866ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
32966ca92a5Swdenk					  get_gclk_freq() cannot work
3305da627a4Swdenk					  e.g. if there is no 32KHz
3315da627a4Swdenk					  reference PIT/RTC clock
33266ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
33366ca92a5Swdenk					  or XTAL/EXTAL)
334c609719bSwdenk
33566ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
33866ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
33975d1ea7fSwdenk			See doc/README.MPC866
34075d1ea7fSwdenk
3416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
34275d1ea7fSwdenk
34375d1ea7fSwdenk		Define this to measure the actual CPU clock instead
34475d1ea7fSwdenk		of relying on the correctness of the configured
34575d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
34675d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
34775d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
34975d1ea7fSwdenk
350506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
351506f3918SHeiko Schocher
352506f3918SHeiko Schocher		Define this option if you want to enable the
353506f3918SHeiko Schocher		ICache only when Code runs from RAM.
354506f3918SHeiko Schocher
35566412c63SKumar Gala- 85xx CPU Options:
356ffd06e02SYork Sun		CONFIG_SYS_PPC64
357ffd06e02SYork Sun
358ffd06e02SYork Sun		Specifies that the core is a 64-bit PowerPC implementation (implements
359ffd06e02SYork Sun		the "64" category of the Power ISA). This is necessary for ePAPR
360ffd06e02SYork Sun		compliance, among other possible reasons.
361ffd06e02SYork Sun
36266412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36366412c63SKumar Gala
36466412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
36566412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
36666412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
36766412c63SKumar Gala
3688f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3698f29084aSKumar Gala
3708f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3718f29084aSKumar Gala		tree nodes for the given platform.
3728f29084aSKumar Gala
373afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
374afa6b551SPrabhakar Kushwaha
375afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
376afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
377afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
378afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
379afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
380afa6b551SPrabhakar Kushwaha		purpose.
381afa6b551SPrabhakar Kushwaha
38233eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
38333eee330SScott Wood
38433eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
38533eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
38633eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
38733eee330SScott Wood
38833eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
38933eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
39033eee330SScott Wood
39133eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
39233eee330SScott Wood		for which the A004510 workaround should be applied.
39333eee330SScott Wood
39433eee330SScott Wood		The rest of SVR is either not relevant to the decision
39533eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
39633eee330SScott Wood		p2041) or is implied by the build target, which controls
39733eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
39833eee330SScott Wood
39933eee330SScott Wood		See Freescale App Note 4493 for more information about
40033eee330SScott Wood		this erratum.
40133eee330SScott Wood
40274fa22edSPrabhakar Kushwaha		CONFIG_A003399_NOR_WORKAROUND
40374fa22edSPrabhakar Kushwaha		Enables a workaround for IFC erratum A003399. It is only
40474fa22edSPrabhakar Kushwaha		requred during NOR boot.
40574fa22edSPrabhakar Kushwaha
40633eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
40733eee330SScott Wood
40833eee330SScott Wood		This is the value to write into CCSR offset 0x18600
40933eee330SScott Wood		according to the A004510 workaround.
41033eee330SScott Wood
41164501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_DDR_ADDR
41264501c66SPriyanka Jain		This value denotes start offset of DDR memory which is
41364501c66SPriyanka Jain		connected exclusively to the DSP cores.
41464501c66SPriyanka Jain
415765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
416765b0bdbSPriyanka Jain		This value denotes start offset of M2 memory
417765b0bdbSPriyanka Jain		which is directly connected to the DSP core.
418765b0bdbSPriyanka Jain
41964501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
42064501c66SPriyanka Jain		This value denotes start offset of M3 memory which is directly
42164501c66SPriyanka Jain		connected to the DSP core.
42264501c66SPriyanka Jain
423765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
424765b0bdbSPriyanka Jain		This value denotes start offset of DSP CCSR space.
425765b0bdbSPriyanka Jain
426cb93071bSYork Sun		CONFIG_SYS_FSL_DDR_EMU
427cb93071bSYork Sun		Specify emulator support for DDR. Some DDR features such as
428cb93071bSYork Sun		deskew training are not available.
429cb93071bSYork Sun
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
4360b953ffcSMarkus Klotzbuecher- Intel Monahans options:
4376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
4380b953ffcSMarkus Klotzbuecher
4390b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
4400b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
4410b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
4420b953ffcSMarkus Klotzbuecher
4436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
4440b953ffcSMarkus Klotzbuecher
4450b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
4460b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
4470b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
4480b953ffcSMarkus Klotzbuecher		by this value.
4490b953ffcSMarkus Klotzbuecher
45092bbd64eSDaniel Schwierzeck- MIPS CPU options:
45192bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
45292bbd64eSDaniel Schwierzeck
45392bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
45492bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
45592bbd64eSDaniel Schwierzeck		relocation.
45692bbd64eSDaniel Schwierzeck
45792bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
45892bbd64eSDaniel Schwierzeck
45992bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
46092bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
46192bbd64eSDaniel Schwierzeck		Possible values are:
46292bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
46392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
46492bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
46592bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
46692bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
46792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
46892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
46992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
47092bbd64eSDaniel Schwierzeck
47192bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
47292bbd64eSDaniel Schwierzeck
47392bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
47492bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
47592bbd64eSDaniel Schwierzeck
47692bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
47792bbd64eSDaniel Schwierzeck
47892bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
47992bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
48092bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
48192bbd64eSDaniel Schwierzeck
482b67d8816SChristian Riesch- ARM options:
483b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
484b67d8816SChristian Riesch
485b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
486b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
487b67d8816SChristian Riesch
4885356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
4895356f545SAneesh V
4905356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
4915356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
4925356f545SAneesh V		better code density. For ARM architectures that support
4935356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
4945356f545SAneesh V		GCC.
4955356f545SAneesh V
496c5d4752cSStephen Warren		CONFIG_ARM_ERRATA_716044
4970678587fSStephen Warren		CONFIG_ARM_ERRATA_742230
4980678587fSStephen Warren		CONFIG_ARM_ERRATA_743622
4990678587fSStephen Warren		CONFIG_ARM_ERRATA_751472
5000678587fSStephen Warren
5010678587fSStephen Warren		If set, the workarounds for these ARM errata are applied early
5020678587fSStephen Warren		during U-Boot startup. Note that these options force the
5030678587fSStephen Warren		workarounds to be applied; no CPU-type/version detection
5040678587fSStephen Warren		exists, unlike the similar options in the Linux kernel. Do not
5050678587fSStephen Warren		set these options unless they apply!
5060678587fSStephen Warren
507795659dcSStephen Warren- CPU timer options:
508795659dcSStephen Warren		CONFIG_SYS_HZ
509795659dcSStephen Warren
510795659dcSStephen Warren		The frequency of the timer returned by get_timer().
511795659dcSStephen Warren		get_timer() must operate in milliseconds and this CONFIG
512795659dcSStephen Warren		option must be set to 1000.
513795659dcSStephen Warren
5145da627a4Swdenk- Linux Kernel Interface:
515c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
516c609719bSwdenk
517c609719bSwdenk		U-Boot stores all clock information in Hz
518c609719bSwdenk		internally. For binary compatibility with older Linux
519c609719bSwdenk		kernels (which expect the clocks passed in the
520c609719bSwdenk		bd_info data to be in MHz) the environment variable
521c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
522c609719bSwdenk		converts clock data to MHZ before passing it to the
523c609719bSwdenk		Linux kernel.
524c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
525c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
526c609719bSwdenk		default environment.
527c609719bSwdenk
5285da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
5295da627a4Swdenk
53011ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
5315da627a4Swdenk		expect it to be in bytes, others in MB.
5325da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
5335da627a4Swdenk
534fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
535f57f70aaSWolfgang Denk
536f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
537213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
538213bf8c8SGerald Van Baren		concepts).
539213bf8c8SGerald Van Baren
540213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
541213bf8c8SGerald Van Baren		 * New libfdt-based support
542213bf8c8SGerald Van Baren		 * Adds the "fdt" command
5433bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
544213bf8c8SGerald Van Baren
545b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
546b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
547b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
548b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
549f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
550c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
551f57f70aaSWolfgang Denk
55211ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
55311ccc33fSMarcel Ziswiler		addresses
5543bb342fcSKim Phillips
5554e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
5564e253137SKumar Gala
5574e253137SKumar Gala		Board code has addition modification that it wants to make
5584e253137SKumar Gala		to the flat device tree before handing it off to the kernel
5596705d81eSwdenk
5600267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
5610267768eSMatthew McClintock
56211ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
5630267768eSMatthew McClintock		param header, the default value is zero if undefined.
5640267768eSMatthew McClintock
5653887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
5663887c3fbSHeiko Schocher
5673887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
5683887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
5693887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
5703887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
5713887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
5723887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
5733887c3fbSHeiko Schocher
5747eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
5757eb29398SIgor Grinberg
5767eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
5777eb29398SIgor Grinberg		machine type and must be used to specify the machine type
5787eb29398SIgor Grinberg		number as it appears in the ARM machine registry
5797eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
5807eb29398SIgor Grinberg		Only boards that have multiple machine types supported
5817eb29398SIgor Grinberg		in a single configuration file and the machine type is
5827eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
5837eb29398SIgor Grinberg
5840b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5850b2f4ecaSNiklaus Giger
5860b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5870b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5880b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5890b2f4ecaSNiklaus Giger
5900b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5910b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5920b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5930b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5940b2f4ecaSNiklaus Giger
5950b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5960b2f4ecaSNiklaus Giger
5970b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5980b2f4ecaSNiklaus Giger
5990b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
6000b2f4ecaSNiklaus Giger		the defaults discussed just above.
6010b2f4ecaSNiklaus Giger
6022c451f78SAneesh V- Cache Configuration:
6032c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
6042c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
6052c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
6062c451f78SAneesh V
60793bc2193SAneesh V- Cache Configuration for ARM:
60893bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
60993bc2193SAneesh V				      controller
61093bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
61193bc2193SAneesh V					controller register space
61293bc2193SAneesh V
6136705d81eSwdenk- Serial Ports:
61448d0192fSAndreas Engel		CONFIG_PL010_SERIAL
6156705d81eSwdenk
6166705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
6176705d81eSwdenk
61848d0192fSAndreas Engel		CONFIG_PL011_SERIAL
6196705d81eSwdenk
6206705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
6216705d81eSwdenk
6226705d81eSwdenk		CONFIG_PL011_CLOCK
6236705d81eSwdenk
6246705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
6256705d81eSwdenk		the clock speed of the UARTs.
6266705d81eSwdenk
6276705d81eSwdenk		CONFIG_PL01x_PORTS
6286705d81eSwdenk
6296705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
6306705d81eSwdenk		define this to a list of base addresses for each (supported)
6316705d81eSwdenk		port. See e.g. include/configs/versatile.h
6326705d81eSwdenk
633910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
634910f1ae3SJohn Rigby
635910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
636910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
637910f1ae3SJohn Rigby		this variable to initialize the extra register.
638910f1ae3SJohn Rigby
639910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
640910f1ae3SJohn Rigby
641910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
642910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
643910f1ae3SJohn Rigby		variable to flush the UART at init time.
644910f1ae3SJohn Rigby
6456705d81eSwdenk
646c609719bSwdenk- Console Interface:
647c609719bSwdenk		Depending on board, define exactly one serial port
648c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
649c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
650c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
651c609719bSwdenk
652c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
653c609719bSwdenk		port routines must be defined elsewhere
654c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
655c609719bSwdenk
656c609719bSwdenk		CONFIG_CFB_CONSOLE
657c609719bSwdenk		Enables console device for a color framebuffer. Needs following
658c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
659c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
660c609719bSwdenk						(default big endian)
661c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
662c609719bSwdenk						rectangle fill
663c609719bSwdenk						(cf. smiLynxEM)
664c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
665c609719bSwdenk						bit-blit (cf. smiLynxEM)
666c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
667c609719bSwdenk						(cols=pitch)
668c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
669c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
670c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
671c609719bSwdenk						(0-5, cf. cfb_console.c)
672c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
673c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
674c609719bSwdenk						(i.e. i8042_kbd_init())
675c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
676c609719bSwdenk						(i.e. i8042_tstc)
677c609719bSwdenk			VIDEO_GETC_FCT		get char fct
678c609719bSwdenk						(i.e. i8042_getc)
679c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
680c609719bSwdenk						(requires blink timer
681c609719bSwdenk						cf. i8042.c)
6826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
683c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
684c609719bSwdenk						upper right corner
685602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
686c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
687c609719bSwdenk						upper left corner
688a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
689a6c7ad2fSwdenk						linux_logo.h for logo.
690a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
691c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
69211ccc33fSMarcel Ziswiler						additional board info beside
693c609719bSwdenk						the logo
694c609719bSwdenk
69533a35bbbSPali Rohár		When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
69633a35bbbSPali Rohár		a limited number of ANSI escape sequences (cursor control,
69733a35bbbSPali Rohár		erase functions and limited graphics rendition control).
69833a35bbbSPali Rohár
699c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
700c609719bSwdenk		default i/o. Serial console can be forced with
701c609719bSwdenk		environment 'console=serial'.
702c609719bSwdenk
703a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
704a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
705a3ad8e26Swdenk		the "silent" environment variable. See
706a3ad8e26Swdenk		doc/README.silent for more information.
707a3ad8e26Swdenk
70845ae2546SHeiko Schocher		CONFIG_SYS_CONSOLE_BG_COL: define the backgroundcolor, default
70945ae2546SHeiko Schocher			is 0x00.
71045ae2546SHeiko Schocher		CONFIG_SYS_CONSOLE_FG_COL: define the foregroundcolor, default
71145ae2546SHeiko Schocher			is 0xa0.
71245ae2546SHeiko Schocher
713c609719bSwdenk- Console Baudrate:
714c609719bSwdenk		CONFIG_BAUDRATE - in bps
715c609719bSwdenk		Select one of the baudrates listed in
7166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
7176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
718c609719bSwdenk
719c92fac91SHeiko Schocher- Console Rx buffer length
720c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
721c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
7222b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
723c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
724c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
725c92fac91SHeiko Schocher		the SMC.
726c92fac91SHeiko Schocher
7279558b48aSGraeme Russ- Pre-Console Buffer:
7289558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
7299558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
7309558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
7319558b48aSGraeme Russ		buffer any console messages prior to the console being
7329558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
7339558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
7349558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
7359558b48aSGraeme Russ		bytes are output before the console is initialised, the
7369558b48aSGraeme Russ		earlier bytes are discarded.
7379558b48aSGraeme Russ
7389558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
7399558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
7409558b48aSGraeme Russ
741046a37bdSSonny Rao- Safe printf() functions
742046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
743046a37bdSSonny Rao		the printf() functions. These are defined in
744046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
745046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
746046a37bdSSonny Rao		If this option is not given then these functions will
747046a37bdSSonny Rao		silently discard their buffer size argument - this means
748046a37bdSSonny Rao		you are not getting any overflow checking in this case.
749046a37bdSSonny Rao
750c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
751c609719bSwdenk		Delay before automatically booting the default image;
752c609719bSwdenk		set to -1 to disable autoboot.
75393d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
75493d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
755c609719bSwdenk
756c609719bSwdenk		See doc/README.autoboot for these options that
757c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
758c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
759c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
760c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
761c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
762c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
763c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
764c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
765c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
766c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
767c609719bSwdenk		CONFIG_RESET_TO_RETRY
768c609719bSwdenk
769c609719bSwdenk- Autoboot Command:
770c609719bSwdenk		CONFIG_BOOTCOMMAND
771c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
772c609719bSwdenk		define a command string that is automatically executed
773c609719bSwdenk		when no character is read on the console interface
774c609719bSwdenk		within "Boot Delay" after reset.
775c609719bSwdenk
776c609719bSwdenk		CONFIG_BOOTARGS
777c609719bSwdenk		This can be used to pass arguments to the bootm
778c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
779c609719bSwdenk		environment value "bootargs".
780c609719bSwdenk
781c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
782c609719bSwdenk		The value of these goes into the environment as
783c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
784c609719bSwdenk		as a convenience, when switching between booting from
78511ccc33fSMarcel Ziswiler		RAM and NFS.
786c609719bSwdenk
787*eda0ba38SHeiko Schocher- Bootcount:
788*eda0ba38SHeiko Schocher		CONFIG_BOOTCOUNT_LIMIT
789*eda0ba38SHeiko Schocher		Implements a mechanism for detecting a repeating reboot
790*eda0ba38SHeiko Schocher		cycle, see:
791*eda0ba38SHeiko Schocher		http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
792*eda0ba38SHeiko Schocher
793*eda0ba38SHeiko Schocher		CONFIG_BOOTCOUNT_ENV
794*eda0ba38SHeiko Schocher		If no softreset save registers are found on the hardware
795*eda0ba38SHeiko Schocher		"bootcount" is stored in the environment. To prevent a
796*eda0ba38SHeiko Schocher		saveenv on all reboots, the environment variable
797*eda0ba38SHeiko Schocher		"upgrade_available" is used. If "upgrade_available" is
798*eda0ba38SHeiko Schocher		0, "bootcount" is always 0, if "upgrade_available" is
799*eda0ba38SHeiko Schocher		1 "bootcount" is incremented in the environment.
800*eda0ba38SHeiko Schocher		So the Userspace Applikation must set the "upgrade_available"
801*eda0ba38SHeiko Schocher		and "bootcount" variable to 0, if a boot was successfully.
802*eda0ba38SHeiko Schocher
803c609719bSwdenk- Pre-Boot Commands:
804c609719bSwdenk		CONFIG_PREBOOT
805c609719bSwdenk
806c609719bSwdenk		When this option is #defined, the existence of the
807c609719bSwdenk		environment variable "preboot" will be checked
808c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
809c609719bSwdenk		countdown and/or running the auto-boot command resp.
810c609719bSwdenk		entering interactive mode.
811c609719bSwdenk
812c609719bSwdenk		This feature is especially useful when "preboot" is
813c609719bSwdenk		automatically generated or modified. For an example
814c609719bSwdenk		see the LWMON board specific code: here "preboot" is
815c609719bSwdenk		modified when the user holds down a certain
816c609719bSwdenk		combination of keys on the (special) keyboard when
817c609719bSwdenk		booting the systems
818c609719bSwdenk
819c609719bSwdenk- Serial Download Echo Mode:
820c609719bSwdenk		CONFIG_LOADS_ECHO
821c609719bSwdenk		If defined to 1, all characters received during a
822c609719bSwdenk		serial download (using the "loads" command) are
823c609719bSwdenk		echoed back. This might be needed by some terminal
824c609719bSwdenk		emulations (like "cu"), but may as well just take
825c609719bSwdenk		time on others. This setting #define's the initial
826c609719bSwdenk		value of the "loads_echo" environment variable.
827c609719bSwdenk
828602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
829c609719bSwdenk		CONFIG_KGDB_BAUDRATE
830c609719bSwdenk		Select one of the baudrates listed in
8316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
832c609719bSwdenk
833c609719bSwdenk- Monitor Functions:
834602ad3b3SJon Loeliger		Monitor commands can be included or excluded
835602ad3b3SJon Loeliger		from the build by using the #include files
836c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
837c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
838602ad3b3SJon Loeliger		and augmenting with additional #define's
839602ad3b3SJon Loeliger		for wanted commands.
840c609719bSwdenk
841602ad3b3SJon Loeliger		The default command configuration includes all commands
842602ad3b3SJon Loeliger		except those marked below with a "*".
843602ad3b3SJon Loeliger
844602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
845602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
846602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
847602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
848602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
849602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
850602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
851602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
852710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
853602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
854602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
855602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
856a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
857a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
858a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
859a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
860602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
861602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
862246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
863602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
864602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
8655e2b3e0cSJoe Hershberger		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
866fffad71bSJoe Hershberger		CONFIG_CMD_ENV_FLAGS	* display details about env flags
86788733e2cSAndrew Ruder		CONFIG_CMD_ENV_EXISTS	* check existence of env variable
8680c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
86903e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
87003e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
871bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
872602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
87303e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
874602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
875602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
876602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
8774d98b5c8SVincent Stehlé		CONFIG_CMD_FUSE		* Device fuse support
87853fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
879a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
880a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
881bf36c5d5SSimon Glass		CONFIG_CMD_HASH		* calculate hash / digest
882602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
883602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
884602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
885602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
8868fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS		  List all images found in NOR flash
8874d98b5c8SVincent Stehlé		CONFIG_CMD_IMLS_NAND	* List all images found in NAND flash
888602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
8890c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
890c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
891602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
892602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
893602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
894602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
8954d98b5c8SVincent Stehlé		CONFIG_CMD_LDRINFO	* ldrinfo (display Blackfin loader)
896d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
897d22c338eSJoe Hershberger					  (169.254.*.*)
898602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
899602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
9004d98b5c8SVincent Stehlé		CONFIG_CMD_MD5SUM	* print md5 message digest
90102c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
90215a33e49SSimon Glass		CONFIG_CMD_MEMINFO	* Display detailed memory information
903602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
904a2681707SWolfgang Denk					  loop, loopw
9054d98b5c8SVincent Stehlé		CONFIG_CMD_MEMTEST	* mtest
906602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
907602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
908602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
90968d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
910602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
911602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
9124d98b5c8SVincent Stehlé		CONFIG_CMD_NFS		  NFS support
913e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
914e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
915602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
916602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
917602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
918602ad3b3SJon Loeliger					  host
919602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
920ff048ea9SKenneth Waters		CONFIG_CMD_READ		* Read raw data from partition
921602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
922602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
923d304931fSSimon Glass		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
924602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
925602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
926602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
927602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
928602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
929602ad3b3SJon Loeliger					  (4xx only)
930f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
9314d98b5c8SVincent Stehlé		CONFIG_CMD_SHA1SUM	* print sha1 memory digest
93202c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
9337d861d95SBob Liu		CONFIG_CMD_SOFTSWITCH	* Soft switch setting command for BF60x
93474de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
935602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
9367a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
9371fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
938da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
939da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
940602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
941602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
942c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
9434d98b5c8SVincent Stehlé		CONFIG_CMD_XIMG		  Load part of Multi Image
944c609719bSwdenk
945c609719bSwdenk
946c609719bSwdenk		EXAMPLE: If you want all functions except of network
947c609719bSwdenk		support you can write:
948c609719bSwdenk
949602ad3b3SJon Loeliger		#include "config_cmd_all.h"
950602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
951c609719bSwdenk
952213bf8c8SGerald Van Baren	Other Commands:
953213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
954c609719bSwdenk
955c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
956602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
957c609719bSwdenk		what you (and your U-Boot users) are doing. Data
958c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
959c609719bSwdenk		8260 (where accesses to the IMMR region must be
960c609719bSwdenk		uncached), and it cannot be disabled on all other
961c609719bSwdenk		systems where we (mis-) use the data cache to hold an
962c609719bSwdenk		initial stack and some data.
963c609719bSwdenk
964c609719bSwdenk
965c609719bSwdenk		XXX - this list needs to get updated!
966c609719bSwdenk
967a5ecbe62SWolfgang Denk- Regular expression support:
968a5ecbe62SWolfgang Denk		CONFIG_REGEX
969a5ecbe62SWolfgang Denk		If this variable is defined, U-Boot is linked against
970a5ecbe62SWolfgang Denk		the SLRE (Super Light Regular Expression) library,
971a5ecbe62SWolfgang Denk		which adds regex support to some commands, as for
972a5ecbe62SWolfgang Denk		example "env grep" and "setexpr".
973a5ecbe62SWolfgang Denk
97445ba8077SSimon Glass- Device tree:
97545ba8077SSimon Glass		CONFIG_OF_CONTROL
97645ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
97745ba8077SSimon Glass		to configure its devices, instead of relying on statically
97845ba8077SSimon Glass		compiled #defines in the board file. This option is
97945ba8077SSimon Glass		experimental and only available on a few boards. The device
98045ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
98145ba8077SSimon Glass
9822c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
9832c0f79e4SSimon Glass		be done using one of the two options below:
984bbb0b128SSimon Glass
985bbb0b128SSimon Glass		CONFIG_OF_EMBED
986bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
987bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
988bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
989bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
990bbb0b128SSimon Glass		the global data structure as gd->blob.
99145ba8077SSimon Glass
9922c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
9932c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
9942c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
9952c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
9962c0f79e4SSimon Glass
9972c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
9982c0f79e4SSimon Glass
9992c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
10002c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
10012c0f79e4SSimon Glass		still use the individual files if you need something more
10022c0f79e4SSimon Glass		exotic.
10032c0f79e4SSimon Glass
1004c609719bSwdenk- Watchdog:
1005c609719bSwdenk		CONFIG_WATCHDOG
1006c609719bSwdenk		If this variable is defined, it enables watchdog
10076abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
10086abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
10096abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
10106abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
10116abe6fb6SDetlev Zundel		available, then no further board specific code should
10126abe6fb6SDetlev Zundel		be needed to use it.
10136abe6fb6SDetlev Zundel
10146abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
10156abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
10166abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
10176abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
1018c609719bSwdenk
1019c1551ea8Sstroese- U-Boot Version:
1020c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
1021c1551ea8Sstroese		If this variable is defined, an environment variable
1022c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
1023c1551ea8Sstroese		version as printed by the "version" command.
1024a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
1025a1ea8e51SBenoît Thébaudeau		next reset.
1026c1551ea8Sstroese
1027c609719bSwdenk- Real-Time Clock:
1028c609719bSwdenk
1029602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
1030c609719bSwdenk		has to be selected, too. Define exactly one of the
1031c609719bSwdenk		following options:
1032c609719bSwdenk
1033c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
1034c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
10354e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
1036c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
10371cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
1038c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
10397f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
10403bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
10419536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
10424c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
10436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
104471d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
104571d19f30SHeiko Schocher					  RV3029 RTC.
1046c609719bSwdenk
1047b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
1048b37c7e5eSwdenk		must also be configured. See I2C Support, below.
1049b37c7e5eSwdenk
1050e92739d3SPeter Tyser- GPIO Support:
1051e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
1052e92739d3SPeter Tyser
10535dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
10545dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
10555dec49caSChris Packham		pins supported by a particular chip.
10565dec49caSChris Packham
1057e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
1058e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
1059e92739d3SPeter Tyser
1060c609719bSwdenk- Timestamp Support:
1061c609719bSwdenk
1062c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
1063c609719bSwdenk		(date and time) of an image is printed by image
1064c609719bSwdenk		commands like bootm or iminfo. This option is
1065602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1066c609719bSwdenk
1067923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1068923c46f9SKarl O. Pinc		Zero or more of the following:
1069923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1070923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1071923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1072923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1073923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1074923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1075923c46f9SKarl O. Pinc				       disk/part_efi.c
1076923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1077c609719bSwdenk
1078602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1079218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1080923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1081c609719bSwdenk
1082c609719bSwdenk- IDE Reset method:
10834d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
10844d13cbadSwdenk		board configurations files but used nowhere!
1085c609719bSwdenk
10864d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
10874d13cbadSwdenk		be performed by calling the function
10884d13cbadSwdenk			ide_set_reset(int reset)
10894d13cbadSwdenk		which has to be defined in a board specific file
1090c609719bSwdenk
1091c609719bSwdenk- ATAPI Support:
1092c609719bSwdenk		CONFIG_ATAPI
1093c609719bSwdenk
1094c609719bSwdenk		Set this to enable ATAPI support.
1095c609719bSwdenk
1096c40b2956Swdenk- LBA48 Support
1097c40b2956Swdenk		CONFIG_LBA48
1098c40b2956Swdenk
1099c40b2956Swdenk		Set this to enable support for disks larger than 137GB
11004b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1101c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1102c40b2956Swdenk		support disks up to 2.1TB.
1103c40b2956Swdenk
11046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1105c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1106c40b2956Swdenk			Default is 32bit.
1107c40b2956Swdenk
1108c609719bSwdenk- SCSI Support:
1109c609719bSwdenk		At the moment only there is only support for the
1110c609719bSwdenk		SYM53C8XX SCSI controller; define
1111c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1112c609719bSwdenk
11136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
11146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
11156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1116c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1117c609719bSwdenk		devices.
11186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1119c609719bSwdenk
1120447c031bSStefan Reinauer		The environment variable 'scsidevs' is set to the number of
1121447c031bSStefan Reinauer		SCSI devices found during the last scan.
1122447c031bSStefan Reinauer
1123c609719bSwdenk- NETWORK Support (PCI):
1124682011ffSwdenk		CONFIG_E1000
1125ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1126ce5207e1SKyle Moffett
1127ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1128ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1129ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1130ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1131ce5207e1SKyle Moffett
1132ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1133ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1134ce5207e1SKyle Moffett		example with the "sspi" command.
1135ce5207e1SKyle Moffett
1136ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1137ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1138ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1139682011ffSwdenk
1140ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
114111ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1142ac3315c2SAndre Schwarz
1143c609719bSwdenk		CONFIG_EEPRO100
1144c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
114511ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1146c609719bSwdenk		write routine for first time initialisation.
1147c609719bSwdenk
1148c609719bSwdenk		CONFIG_TULIP
1149c609719bSwdenk		Support for Digital 2114x chips.
1150c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1151c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1152c609719bSwdenk
1153c609719bSwdenk		CONFIG_NATSEMI
1154c609719bSwdenk		Support for National dp83815 chips.
1155c609719bSwdenk
1156c609719bSwdenk		CONFIG_NS8382X
1157c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1158c609719bSwdenk
115945219c46Swdenk- NETWORK Support (other):
116045219c46Swdenk
1161c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1162c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1163c041e9d2SJens Scharsig
1164c041e9d2SJens Scharsig			CONFIG_RMII
1165c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1166c041e9d2SJens Scharsig
1167c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1168c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1169c041e9d2SJens Scharsig			The driver doen't show link status messages.
1170c041e9d2SJens Scharsig
1171efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1172efdd7319SRob Herring		Support for the Calxeda XGMAC device
1173efdd7319SRob Herring
11743bb46d23SAshok		CONFIG_LAN91C96
117545219c46Swdenk		Support for SMSC's LAN91C96 chips.
117645219c46Swdenk
117745219c46Swdenk			CONFIG_LAN91C96_BASE
117845219c46Swdenk			Define this to hold the physical address
117945219c46Swdenk			of the LAN91C96's I/O space
118045219c46Swdenk
118145219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
118245219c46Swdenk			Define this to enable 32 bit addressing
118345219c46Swdenk
11843bb46d23SAshok		CONFIG_SMC91111
1185f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1186f39748aeSwdenk
1187f39748aeSwdenk			CONFIG_SMC91111_BASE
1188f39748aeSwdenk			Define this to hold the physical address
1189f39748aeSwdenk			of the device (I/O space)
1190f39748aeSwdenk
1191f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1192f39748aeSwdenk			Define this if data bus is 32 bits
1193f39748aeSwdenk
1194f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1195f39748aeSwdenk			Define this to use i/o functions instead of macros
1196f39748aeSwdenk			(some hardware wont work with macros)
1197f39748aeSwdenk
1198dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1199dc02badaSHeiko Schocher		Support for davinci emac
1200dc02badaSHeiko Schocher
1201dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1202dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1203dc02badaSHeiko Schocher
1204b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1205b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1206b3dbf4a5SMacpaul Lin
1207b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1208b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1209b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1210b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1211b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1212b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1213b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1214b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1215b3dbf4a5SMacpaul Lin
1216c2fff331SMike Rapoport		CONFIG_SMC911X
1217557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1218557b377dSJens Gehrlein
1219c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1220557b377dSJens Gehrlein			Define this to hold the physical address
1221557b377dSJens Gehrlein			of the device (I/O space)
1222557b377dSJens Gehrlein
1223c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1224557b377dSJens Gehrlein			Define this if data bus is 32 bits
1225557b377dSJens Gehrlein
1226c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1227557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1228557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1229c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1230557b377dSJens Gehrlein
12313d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
12323d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
12333d0075faSYoshihiro Shimoda
12343d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
12353d0075faSYoshihiro Shimoda			Define the number of ports to be used
12363d0075faSYoshihiro Shimoda
12373d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
12383d0075faSYoshihiro Shimoda			Define the ETH PHY's address
12393d0075faSYoshihiro Shimoda
124068260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
124168260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
124268260aabSYoshihiro Shimoda
12435e124724SVadim Bendebury- TPM Support:
124490899cc0SChe-liang Chiou		CONFIG_TPM
124590899cc0SChe-liang Chiou		Support TPM devices.
124690899cc0SChe-liang Chiou
12471b393db5STom Wai-Hong Tam		CONFIG_TPM_TIS_I2C
12481b393db5STom Wai-Hong Tam		Support for i2c bus TPM devices. Only one device
12491b393db5STom Wai-Hong Tam		per system is supported at this time.
12501b393db5STom Wai-Hong Tam
12511b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BUS_NUMBER
12521b393db5STom Wai-Hong Tam			Define the the i2c bus number for the TPM device
12531b393db5STom Wai-Hong Tam
12541b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
12551b393db5STom Wai-Hong Tam			Define the TPM's address on the i2c bus
12561b393db5STom Wai-Hong Tam
12571b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BURST_LIMITATION
12581b393db5STom Wai-Hong Tam			Define the burst count bytes upper limit
12591b393db5STom Wai-Hong Tam
1260c01939c7SDirk Eibach		CONFIG_TPM_ATMEL_TWI
1261c01939c7SDirk Eibach		Support for Atmel TWI TPM device. Requires I2C support.
1262c01939c7SDirk Eibach
126390899cc0SChe-liang Chiou		CONFIG_TPM_TIS_LPC
12645e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
12655e124724SVadim Bendebury		per system is supported at this time.
12665e124724SVadim Bendebury
12675e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
12685e124724SVadim Bendebury			Base address where the generic TPM device is mapped
12695e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
12705e124724SVadim Bendebury			0xfed40000.
12715e124724SVadim Bendebury
1272be6c1529SReinhard Pfau		CONFIG_CMD_TPM
1273be6c1529SReinhard Pfau		Add tpm monitor functions.
1274be6c1529SReinhard Pfau		Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
1275be6c1529SReinhard Pfau		provides monitor access to authorized functions.
1276be6c1529SReinhard Pfau
1277be6c1529SReinhard Pfau		CONFIG_TPM
1278be6c1529SReinhard Pfau		Define this to enable the TPM support library which provides
1279be6c1529SReinhard Pfau		functional interfaces to some TPM commands.
1280be6c1529SReinhard Pfau		Requires support for a TPM device.
1281be6c1529SReinhard Pfau
1282be6c1529SReinhard Pfau		CONFIG_TPM_AUTH_SESSIONS
1283be6c1529SReinhard Pfau		Define this to enable authorized functions in the TPM library.
1284be6c1529SReinhard Pfau		Requires CONFIG_TPM and CONFIG_SHA1.
1285be6c1529SReinhard Pfau
1286c609719bSwdenk- USB Support:
1287c609719bSwdenk		At the moment only the UHCI host controller is
12884d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1289c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1290c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
129130d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1292c609719bSwdenk		storage devices.
1293c609719bSwdenk		Note:
1294c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1295c609719bSwdenk		(TEAC FD-05PUB).
12964d13cbadSwdenk		MPC5200 USB requires additional defines:
12974d13cbadSwdenk			CONFIG_USB_CLOCK
12984d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1299307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1300307ecb6dSEric Millbrandt				for USB on PSC3
13014d13cbadSwdenk			CONFIG_USB_CONFIG
13024d13cbadSwdenk				for differential drivers: 0x00001000
13034d13cbadSwdenk				for single ended drivers: 0x00005000
1304307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1305307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
13066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1307fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1308fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
13094d13cbadSwdenk
13109ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
13119ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
13129ab4ce22SSimon Glass
1313aa155058SKuo-Jung Su		CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
1314aa155058SKuo-Jung Su		interval for usb hub power-on delay.(minimum 100msec)
1315aa155058SKuo-Jung Su
131616c8d5e7SWolfgang Denk- USB Device:
131716c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
131816c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
131916c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
132011ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
132116c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
132216c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
132316c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
132416c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
132516c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
132616c8d5e7SWolfgang Denk		a Linux host by
132716c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
132816c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
132916c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
133016c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
133116c8d5e7SWolfgang Denk
133216c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
133316c8d5e7SWolfgang Denk			Define this to build a UDC device
133416c8d5e7SWolfgang Denk
133516c8d5e7SWolfgang Denk			CONFIG_USB_TTY
133616c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
133716c8d5e7SWolfgang Denk			talk to the UDC device
133816c8d5e7SWolfgang Denk
1339f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1340f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1341f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1342f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1343f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1344f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1345f9da0f89SVipin KUMAR			speed.
1346f9da0f89SVipin KUMAR
13476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
134816c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
134916c8d5e7SWolfgang Denk			be set to usbtty.
135016c8d5e7SWolfgang Denk
135116c8d5e7SWolfgang Denk			mpc8xx:
13526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
135316c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
13546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
135516c8d5e7SWolfgang Denk
13566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
135716c8d5e7SWolfgang Denk				Derive USB clock from brgclk
13586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
135916c8d5e7SWolfgang Denk
136016c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
136116c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
136216c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
136316c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
136416c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
136516c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
136616c8d5e7SWolfgang Denk
136716c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
136816c8d5e7SWolfgang Denk			Define this string as the name of your company for
136916c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
137016c8d5e7SWolfgang Denk
137116c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
137216c8d5e7SWolfgang Denk			Define this string as the name of your product
137316c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
137416c8d5e7SWolfgang Denk
137516c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
137616c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
137716c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
137816c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
137916c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
138016c8d5e7SWolfgang Denk
138116c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
138216c8d5e7SWolfgang Denk			Define this as the unique Product ID
138316c8d5e7SWolfgang Denk			for your device
138416c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1385c609719bSwdenk
1386351e9b20SPrzemyslaw Marczak		Some USB device drivers may need to check USB cable attachment.
1387351e9b20SPrzemyslaw Marczak		In this case you can enable following config in BoardName.h:
1388351e9b20SPrzemyslaw Marczak			CONFIG_USB_CABLE_CHECK
1389351e9b20SPrzemyslaw Marczak			This enables function definition:
1390351e9b20SPrzemyslaw Marczak			- usb_cable_connected() in include/usb.h
1391351e9b20SPrzemyslaw Marczak			Implementation of this function is board-specific.
1392351e9b20SPrzemyslaw Marczak
1393d70a560fSIgor Grinberg- ULPI Layer Support:
1394d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1395d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1396d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1397d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1398d70a560fSIgor Grinberg		viewport is supported.
1399d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1400d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
14016d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
14026d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
14036d365ea0SLucas Stach		the appropriate value in Hz.
1404c609719bSwdenk
1405c609719bSwdenk- MMC Support:
1406c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1407c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1408c609719bSwdenk		accessed from the boot prompt by mapping the device
1409c609719bSwdenk		to physical memory similar to flash. Command line is
1410602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1411602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1412c609719bSwdenk
1413afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1414afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1415afb35666SYoshihiro Shimoda
1416afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1417afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1418afb35666SYoshihiro Shimoda
1419afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1420afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1421afb35666SYoshihiro Shimoda
1422b3ba6e94STom Rini- USB Device Firmware Update (DFU) class support:
1423b3ba6e94STom Rini		CONFIG_DFU_FUNCTION
1424b3ba6e94STom Rini		This enables the USB portion of the DFU USB class
1425b3ba6e94STom Rini
1426b3ba6e94STom Rini		CONFIG_CMD_DFU
1427b3ba6e94STom Rini		This enables the command "dfu" which is used to have
1428b3ba6e94STom Rini		U-Boot create a DFU class device via USB.  This command
1429b3ba6e94STom Rini		requires that the "dfu_alt_info" environment variable be
1430b3ba6e94STom Rini		set and define the alt settings to expose to the host.
1431b3ba6e94STom Rini
1432b3ba6e94STom Rini		CONFIG_DFU_MMC
1433b3ba6e94STom Rini		This enables support for exposing (e)MMC devices via DFU.
1434b3ba6e94STom Rini
1435c6631764SPantelis Antoniou		CONFIG_DFU_NAND
1436c6631764SPantelis Antoniou		This enables support for exposing NAND devices via DFU.
1437c6631764SPantelis Antoniou
1438a9479f04SAfzal Mohammed		CONFIG_DFU_RAM
1439a9479f04SAfzal Mohammed		This enables support for exposing RAM via DFU.
1440a9479f04SAfzal Mohammed		Note: DFU spec refer to non-volatile memory usage, but
1441a9479f04SAfzal Mohammed		allow usages beyond the scope of spec - here RAM usage,
1442a9479f04SAfzal Mohammed		one that would help mostly the developer.
1443a9479f04SAfzal Mohammed
1444e7e75c70SHeiko Schocher		CONFIG_SYS_DFU_DATA_BUF_SIZE
1445e7e75c70SHeiko Schocher		Dfu transfer uses a buffer before writing data to the
1446e7e75c70SHeiko Schocher		raw storage device. Make the size (in bytes) of this buffer
1447e7e75c70SHeiko Schocher		configurable. The size of this buffer is also configurable
1448e7e75c70SHeiko Schocher		through the "dfu_bufsiz" environment variable.
1449e7e75c70SHeiko Schocher
1450ea2453d5SPantelis Antoniou		CONFIG_SYS_DFU_MAX_FILE_SIZE
1451ea2453d5SPantelis Antoniou		When updating files rather than the raw storage device,
1452ea2453d5SPantelis Antoniou		we use a static buffer to copy the file into and then write
1453ea2453d5SPantelis Antoniou		the buffer once we've been given the whole file.  Define
1454ea2453d5SPantelis Antoniou		this to the maximum filesize (in bytes) for the buffer.
1455ea2453d5SPantelis Antoniou		Default is 4 MiB if undefined.
1456ea2453d5SPantelis Antoniou
14576705d81eSwdenk- Journaling Flash filesystem support:
14586705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
14596705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
14606705d81eSwdenk		Define these for a default partition on a NAND device
14616705d81eSwdenk
14626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
14636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
14646705d81eSwdenk		Define these for a default partition on a NOR device
14656705d81eSwdenk
14666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
14676705d81eSwdenk		Define this to create an own partition. You have to provide a
14686705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
14696705d81eSwdenk
14706705d81eSwdenk		If you define only one JFFS2 partition you may also want to
14716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
14726705d81eSwdenk		to disable the command chpart. This is the default when you
14736705d81eSwdenk		have not defined a custom partition
14746705d81eSwdenk
1475c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1476c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1477656f4c65SDonggeun Kim
1478656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1479656f4c65SDonggeun Kim		file in FAT formatted partition.
1480656f4c65SDonggeun Kim
1481656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1482656f4c65SDonggeun Kim		user to write files to FAT.
1483c30a15e5SDonggeun Kim
148484cd9327SGabe BlackCBFS (Coreboot Filesystem) support
148584cd9327SGabe Black		CONFIG_CMD_CBFS
148684cd9327SGabe Black
148784cd9327SGabe Black		Define this to enable support for reading from a Coreboot
148884cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
148984cd9327SGabe Black		and cbfsload.
149084cd9327SGabe Black
1491c609719bSwdenk- Keyboard Support:
1492c609719bSwdenk		CONFIG_ISA_KEYBOARD
1493c609719bSwdenk
1494c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1495c609719bSwdenk		support
1496c609719bSwdenk
1497c609719bSwdenk		CONFIG_I8042_KBD
1498c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1499c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1500c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1501c609719bSwdenk		for cfb_console. Supports cursor blinking.
1502c609719bSwdenk
1503713cb680SHung-ying Tyan		CONFIG_CROS_EC_KEYB
1504713cb680SHung-ying Tyan		Enables a Chrome OS keyboard using the CROS_EC interface.
1505713cb680SHung-ying Tyan		This uses CROS_EC to communicate with a second microcontroller
1506713cb680SHung-ying Tyan		which provides key scans on request.
1507713cb680SHung-ying Tyan
1508c609719bSwdenk- Video support:
1509c609719bSwdenk		CONFIG_VIDEO
1510c609719bSwdenk
1511c609719bSwdenk		Define this to enable video support (for output to
1512c609719bSwdenk		video).
1513c609719bSwdenk
1514c609719bSwdenk		CONFIG_VIDEO_CT69000
1515c609719bSwdenk
1516c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1517c609719bSwdenk
1518c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1519eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1520eeb1b77bSwdenk		video output is selected via environment 'videoout'
1521eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1522eeb1b77bSwdenk		assumed.
1523c609719bSwdenk
1524eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
152511ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1526eeb1b77bSwdenk		are possible:
1527eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1528eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1529eeb1b77bSwdenk
1530eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1531eeb1b77bSwdenk		-------------+---------------------------------------------
1532eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1533eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1534eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1535eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1536eeb1b77bSwdenk		-------------+---------------------------------------------
1537c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1538c609719bSwdenk
1539eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
15407817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1541eeb1b77bSwdenk
1542eeb1b77bSwdenk
1543a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1544a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1545a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1546a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1547a6c7ad2fSwdenk
15487d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
15497d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
15507d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
15517d3053fbSTimur Tabi		support, and should also define these other macros:
15527d3053fbSTimur Tabi
15537d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
15547d3053fbSTimur Tabi			CONFIG_VIDEO
15557d3053fbSTimur Tabi			CONFIG_CMD_BMP
15567d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
15577d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
15587d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
15597d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
15607d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
15617d3053fbSTimur Tabi
1562ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1563ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1564ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1565ba8e76bdSTimur Tabi		description of this variable.
15667d3053fbSTimur Tabi
1567058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1568058d59b0SSimon Glass
1569058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1570058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1571058d59b0SSimon Glass		driver.
1572058d59b0SSimon Glass
1573058d59b0SSimon Glass
1574682011ffSwdenk- Keyboard Support:
1575682011ffSwdenk		CONFIG_KEYBOARD
1576682011ffSwdenk
1577682011ffSwdenk		Define this to enable a custom keyboard support.
1578682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1579682011ffSwdenk		defined in your board-specific files.
1580682011ffSwdenk		The only board using this so far is RBC823.
1581a6c7ad2fSwdenk
1582c609719bSwdenk- LCD Support:	CONFIG_LCD
1583c609719bSwdenk
1584c609719bSwdenk		Define this to enable LCD support (for output to LCD
1585c609719bSwdenk		display); also select one of the supported displays
1586c609719bSwdenk		by defining one of these:
1587c609719bSwdenk
158839cf4804SStelian Pop		CONFIG_ATMEL_LCD:
158939cf4804SStelian Pop
159039cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
159139cf4804SStelian Pop
1592fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1593c609719bSwdenk
1594fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1595c609719bSwdenk
1596fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1597c609719bSwdenk
1598fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1599fd3103bbSwdenk			Active, color, single scan.
1600fd3103bbSwdenk
1601fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1602fd3103bbSwdenk
1603fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1604c609719bSwdenk			Active, color, single scan.
1605c609719bSwdenk
1606c609719bSwdenk		CONFIG_SHARP_16x9
1607c609719bSwdenk
1608c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1609c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1610c609719bSwdenk
1611c609719bSwdenk		CONFIG_SHARP_LQ64D341
1612c609719bSwdenk
1613c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1614c609719bSwdenk			Active, color, single scan.
1615c609719bSwdenk
1616c609719bSwdenk		CONFIG_HLD1045
1617c609719bSwdenk
1618c609719bSwdenk			HLD1045 display, 640x480.
1619c609719bSwdenk			Active, color, single scan.
1620c609719bSwdenk
1621c609719bSwdenk		CONFIG_OPTREX_BW
1622c609719bSwdenk
1623c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1624c609719bSwdenk			or
1625c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1626c609719bSwdenk			or
1627c609719bSwdenk			Hitachi	 SP14Q002
1628c609719bSwdenk
1629c609719bSwdenk			320x240. Black & white.
1630c609719bSwdenk
1631c609719bSwdenk		Normally display is black on white background; define
16326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1633c609719bSwdenk
1634676d319eSSimon Glass		CONFIG_LCD_ALIGNMENT
1635676d319eSSimon Glass
1636676d319eSSimon Glass		Normally the LCD is page-aligned (tyically 4KB). If this is
1637676d319eSSimon Glass		defined then the LCD will be aligned to this value instead.
1638676d319eSSimon Glass		For ARM it is sometimes useful to use MMU_SECTION_SIZE
1639676d319eSSimon Glass		here, since it is cheaper to change data cache settings on
1640676d319eSSimon Glass		a per-section basis.
1641676d319eSSimon Glass
16420d89efefSSimon Glass		CONFIG_CONSOLE_SCROLL_LINES
16430d89efefSSimon Glass
16440d89efefSSimon Glass		When the console need to be scrolled, this is the number of
16450d89efefSSimon Glass		lines to scroll by. It defaults to 1. Increasing this makes
16460d89efefSSimon Glass		the console jump but can help speed up operation when scrolling
16470d89efefSSimon Glass		is slow.
1648676d319eSSimon Glass
164945d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
165045d7f525STom Wai-Hong Tam
165145d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
165245d7f525STom Wai-Hong Tam
1653735987c5STom Wai-Hong Tam		CONFIG_I2C_EDID
1654735987c5STom Wai-Hong Tam
1655735987c5STom Wai-Hong Tam		Enables an 'i2c edid' command which can read EDID
1656735987c5STom Wai-Hong Tam		information over I2C from an attached LCD display.
1657735987c5STom Wai-Hong Tam
16587152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1659d791b1dcSwdenk
1660d791b1dcSwdenk		If this option is set, the environment is checked for
1661d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1662d791b1dcSwdenk		of logo, copyright and system information on the LCD
1663e94d2cd9Swdenk		is suppressed and the BMP image at the address
1664d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1665d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1666d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1667d791b1dcSwdenk		loaded very quickly after power-on.
1668d791b1dcSwdenk
1669c0880485SNikita Kiryanov		CONFIG_SPLASHIMAGE_GUARD
1670c0880485SNikita Kiryanov
1671c0880485SNikita Kiryanov		If this option is set, then U-Boot will prevent the environment
1672c0880485SNikita Kiryanov		variable "splashimage" from being set to a problematic address
1673c0880485SNikita Kiryanov		(see README.displaying-bmps and README.arm-unaligned-accesses).
1674c0880485SNikita Kiryanov		This option is useful for targets where, due to alignment
1675c0880485SNikita Kiryanov		restrictions, an improperly aligned BMP image will cause a data
1676c0880485SNikita Kiryanov		abort. If you think you will not have problems with unaligned
1677c0880485SNikita Kiryanov		accesses (for example because your toolchain prevents them)
1678c0880485SNikita Kiryanov		there is no need to set this option.
1679c0880485SNikita Kiryanov
16801ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
16811ca298ceSMatthias Weisser
16821ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
16831ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
16841ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
16851ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
16861ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
16871ca298ceSMatthias Weisser		specify 'm' for centering the image.
16881ca298ceSMatthias Weisser
16891ca298ceSMatthias Weisser		Example:
16901ca298ceSMatthias Weisser		setenv splashpos m,m
16911ca298ceSMatthias Weisser			=> image at center of screen
16921ca298ceSMatthias Weisser
16931ca298ceSMatthias Weisser		setenv splashpos 30,20
16941ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
16951ca298ceSMatthias Weisser
16961ca298ceSMatthias Weisser		setenv splashpos -10,m
16971ca298ceSMatthias Weisser			=> vertically centered image
16981ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
16991ca298ceSMatthias Weisser
170098f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
170198f4a3dfSStefan Roese
170298f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
170398f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
170498f4a3dfSStefan Roese		splashscreen support or the bmp command.
170598f4a3dfSStefan Roese
1706d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1707d5011762SAnatolij Gustschin
1708d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1709d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1710d5011762SAnatolij Gustschin		bmp command.
1711d5011762SAnatolij Gustschin
1712f2b96dfbSLei Wen- Do compresssing for memory range:
1713f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1714f2b96dfbSLei Wen
1715f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1716f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1717f2b96dfbSLei Wen
1718c29fdfc1Swdenk- Compression support:
17198ef70478SKees Cook		CONFIG_GZIP
17208ef70478SKees Cook
17218ef70478SKees Cook		Enabled by default to support gzip compressed images.
17228ef70478SKees Cook
1723c29fdfc1Swdenk		CONFIG_BZIP2
1724c29fdfc1Swdenk
1725c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1726c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1727c29fdfc1Swdenk		compressed images are supported.
1728c29fdfc1Swdenk
1729c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
17306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1731c29fdfc1Swdenk		be at least 4MB.
1732d791b1dcSwdenk
1733fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1734fc9c1727SLuigi 'Comio' Mantellini
1735fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1736fc9c1727SLuigi 'Comio' Mantellini		images is included.
1737fc9c1727SLuigi 'Comio' Mantellini
1738fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1739fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1740fc9c1727SLuigi 'Comio' Mantellini		formula:
1741fc9c1727SLuigi 'Comio' Mantellini
1742fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1743fc9c1727SLuigi 'Comio' Mantellini
1744fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1745fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1746fc9c1727SLuigi 'Comio' Mantellini
1747fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1748fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1749fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1750fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1751fc9c1727SLuigi 'Comio' Mantellini
1752fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1753fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
17546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1755fc9c1727SLuigi 'Comio' Mantellini
17568ef70478SKees Cook		CONFIG_LZO
17578ef70478SKees Cook
17588ef70478SKees Cook		If this option is set, support for LZO compressed images
17598ef70478SKees Cook		is included.
17608ef70478SKees Cook
176117ea1177Swdenk- MII/PHY support:
176217ea1177Swdenk		CONFIG_PHY_ADDR
176317ea1177Swdenk
176417ea1177Swdenk		The address of PHY on MII bus.
176517ea1177Swdenk
176617ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
176717ea1177Swdenk
176817ea1177Swdenk		The clock frequency of the MII bus
176917ea1177Swdenk
177017ea1177Swdenk		CONFIG_PHY_GIGE
177117ea1177Swdenk
177217ea1177Swdenk		If this option is set, support for speed/duplex
177311ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
177417ea1177Swdenk
177517ea1177Swdenk		CONFIG_PHY_RESET_DELAY
177617ea1177Swdenk
177717ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
177817ea1177Swdenk		reset before any MII register access is possible.
177917ea1177Swdenk		For such PHY, set this option to the usec delay
178017ea1177Swdenk		required. (minimum 300usec for LXT971A)
178117ea1177Swdenk
178217ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
178317ea1177Swdenk
178417ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
178517ea1177Swdenk		command issued before MII status register can be read
178617ea1177Swdenk
1787c609719bSwdenk- Ethernet address:
1788c609719bSwdenk		CONFIG_ETHADDR
1789c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1790c609719bSwdenk		CONFIG_ETH2ADDR
1791c609719bSwdenk		CONFIG_ETH3ADDR
1792c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1793c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1794c609719bSwdenk
179511ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
179611ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1797c609719bSwdenk		is not determined automatically.
1798c609719bSwdenk
1799c609719bSwdenk- IP address:
1800c609719bSwdenk		CONFIG_IPADDR
1801c609719bSwdenk
1802c609719bSwdenk		Define a default value for the IP address to use for
180311ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1804c609719bSwdenk		determined through e.g. bootp.
18051ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1806c609719bSwdenk
1807c609719bSwdenk- Server IP address:
1808c609719bSwdenk		CONFIG_SERVERIP
1809c609719bSwdenk
1810c609719bSwdenk		Defines a default value for the IP address of a TFTP
1811c609719bSwdenk		server to contact when using the "tftboot" command.
18121ebcd654SWolfgang Denk		(Environment variable "serverip")
1813c609719bSwdenk
181497cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
181597cfe861SRobin Getz
181697cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
181797cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
181897cfe861SRobin Getz
18191ebcd654SWolfgang Denk- Gateway IP address:
18201ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
18211ebcd654SWolfgang Denk
18221ebcd654SWolfgang Denk		Defines a default value for the IP address of the
18231ebcd654SWolfgang Denk		default router where packets to other networks are
18241ebcd654SWolfgang Denk		sent to.
18251ebcd654SWolfgang Denk		(Environment variable "gatewayip")
18261ebcd654SWolfgang Denk
18271ebcd654SWolfgang Denk- Subnet mask:
18281ebcd654SWolfgang Denk		CONFIG_NETMASK
18291ebcd654SWolfgang Denk
18301ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
18311ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
18321ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
18331ebcd654SWolfgang Denk		forwarded through a router.
18341ebcd654SWolfgang Denk		(Environment variable "netmask")
18351ebcd654SWolfgang Denk
183653a5c424SDavid Updegraff- Multicast TFTP Mode:
183753a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
183853a5c424SDavid Updegraff
183953a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
184053a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
184111ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
184253a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
184353a5c424SDavid Updegraff		multicast group.
184453a5c424SDavid Updegraff
1845c609719bSwdenk- BOOTP Recovery Mode:
1846c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1847c609719bSwdenk
1848c609719bSwdenk		If you have many targets in a network that try to
1849c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1850c609719bSwdenk		systems send out BOOTP requests at precisely the same
1851c609719bSwdenk		moment (which would happen for instance at recovery
1852c609719bSwdenk		from a power failure, when all systems will try to
1853c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1854c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1855c609719bSwdenk		inserted before sending out BOOTP requests. The
18566c33c785SWolfgang Denk		following delays are inserted then:
1857c609719bSwdenk
1858c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1859c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1860c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1861c609719bSwdenk		4th and following
1862c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1863c609719bSwdenk
1864fe389a82Sstroese- DHCP Advanced Options:
18651fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
18661fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1867fe389a82Sstroese
18681fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
18691fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
18701fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
18711fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
18721fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
18731fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
18741fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
18751fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
18761fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
18771fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
18781fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
18791fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
18802c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1881fe389a82Sstroese
18825d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
18835d110f0aSWilson Callan		environment variable, not the BOOTP server.
1884fe389a82Sstroese
18852c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
18862c00e099SJoe Hershberger		after the configured retry count, the call will fail
18872c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
18882c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
18892c00e099SJoe Hershberger		is not available.
18902c00e099SJoe Hershberger
1891fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1892fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1893fe389a82Sstroese		than one DNS serverip is offered to the client.
1894fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1895fe389a82Sstroese		serverip will be stored in the additional environment
1896fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1897fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
18981fe80d79SJon Loeliger		is defined.
1899fe389a82Sstroese
1900fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1901fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1902fe389a82Sstroese		need the hostname of the DHCP requester.
19035d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
19041fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
19051fe80d79SJon Loeliger		option 12 to the DHCP server.
1906fe389a82Sstroese
1907d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1908d9a2f416SAras Vaichas
1909d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1910d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1911d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1912d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1913d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1914d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1915d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1916d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1917d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1918d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1919d9a2f416SAras Vaichas		this delay.
1920d9a2f416SAras Vaichas
1921d22c338eSJoe Hershberger - Link-local IP address negotiation:
1922d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1923d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1924d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1925d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1926d22c338eSJoe Hershberger
1927d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1928d22c338eSJoe Hershberger
1929a3d991bdSwdenk - CDP Options:
1930a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1931a3d991bdSwdenk
1932a3d991bdSwdenk		The device id used in CDP trigger frames.
1933a3d991bdSwdenk
1934a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1935a3d991bdSwdenk
1936a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1937a3d991bdSwdenk		of the device.
1938a3d991bdSwdenk
1939a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1940a3d991bdSwdenk
1941a3d991bdSwdenk		A printf format string which contains the ascii name of
1942a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
194311ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1944a3d991bdSwdenk
1945a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1946a3d991bdSwdenk
1947a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1948a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1949a3d991bdSwdenk
1950a3d991bdSwdenk		CONFIG_CDP_VERSION
1951a3d991bdSwdenk
1952a3d991bdSwdenk		An ascii string containing the version of the software.
1953a3d991bdSwdenk
1954a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1955a3d991bdSwdenk
1956a3d991bdSwdenk		An ascii string containing the name of the platform.
1957a3d991bdSwdenk
1958a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1959a3d991bdSwdenk
1960a3d991bdSwdenk		A 32bit integer sent on the trigger.
1961a3d991bdSwdenk
1962a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1963a3d991bdSwdenk
1964a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1965a3d991bdSwdenk		device in .1 of milliwatts.
1966a3d991bdSwdenk
1967a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1968a3d991bdSwdenk
1969a3d991bdSwdenk		A byte containing the id of the VLAN.
1970a3d991bdSwdenk
1971c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1972c609719bSwdenk
1973c609719bSwdenk		Several configurations allow to display the current
1974c609719bSwdenk		status using a LED. For instance, the LED will blink
1975c609719bSwdenk		fast while running U-Boot code, stop blinking as
1976c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1977c609719bSwdenk		start blinking slow once the Linux kernel is running
1978c609719bSwdenk		(supported by a status LED driver in the Linux
1979c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1980c609719bSwdenk		feature in U-Boot.
1981c609719bSwdenk
1982c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1983c609719bSwdenk
1984c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1985c609719bSwdenk		on those systems that support this (optional)
1986c609719bSwdenk		feature, like the TQM8xxL modules.
1987c609719bSwdenk
19883f4978c7SHeiko Schocher- I2C Support:	CONFIG_SYS_I2C
1989c609719bSwdenk
19903f4978c7SHeiko Schocher		This enable the NEW i2c subsystem, and will allow you to use
19913f4978c7SHeiko Schocher		i2c commands at the u-boot command line (as long as you set
19923f4978c7SHeiko Schocher		CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
19933f4978c7SHeiko Schocher		based realtime clock chips or other i2c devices. See
19943f4978c7SHeiko Schocher		common/cmd_i2c.c for a description of the command line
19953f4978c7SHeiko Schocher		interface.
19963f4978c7SHeiko Schocher
19973f4978c7SHeiko Schocher		ported i2c driver to the new framework:
1998ea818dbbSHeiko Schocher		- drivers/i2c/soft_i2c.c:
1999ea818dbbSHeiko Schocher		  - activate first bus with CONFIG_SYS_I2C_SOFT define
2000ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
2001ea818dbbSHeiko Schocher		    for defining speed and slave address
2002ea818dbbSHeiko Schocher		  - activate second bus with I2C_SOFT_DECLARATIONS2 define
2003ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
2004ea818dbbSHeiko Schocher		    for defining speed and slave address
2005ea818dbbSHeiko Schocher		  - activate third bus with I2C_SOFT_DECLARATIONS3 define
2006ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
2007ea818dbbSHeiko Schocher		    for defining speed and slave address
2008ea818dbbSHeiko Schocher		  - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
2009ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
2010ea818dbbSHeiko Schocher		    for defining speed and slave address
20113f4978c7SHeiko Schocher
201200f792e0SHeiko Schocher		- drivers/i2c/fsl_i2c.c:
201300f792e0SHeiko Schocher		  - activate i2c driver with CONFIG_SYS_I2C_FSL
201400f792e0SHeiko Schocher		    define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
201500f792e0SHeiko Schocher		    offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
201600f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
201700f792e0SHeiko Schocher		    bus.
201800f792e0SHeiko Schocher		  - If your board supports a second fsl i2c bus, define
201900f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
202000f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SPEED for the speed and
202100f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
202200f792e0SHeiko Schocher		    second bus.
202300f792e0SHeiko Schocher
20241f2ba722SSimon Glass		- drivers/i2c/tegra_i2c.c:
20251f2ba722SSimon Glass		  - activate this driver with CONFIG_SYS_I2C_TEGRA
20261f2ba722SSimon Glass		  - This driver adds 4 i2c buses with a fix speed from
20271f2ba722SSimon Glass		    100000 and the slave addr 0!
20281f2ba722SSimon Glass
2029880540deSDirk Eibach		- drivers/i2c/ppc4xx_i2c.c
2030880540deSDirk Eibach		  - activate this driver with CONFIG_SYS_I2C_PPC4XX
2031880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
2032880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
2033880540deSDirk Eibach
2034fac96408Strem		- drivers/i2c/i2c_mxc.c
2035fac96408Strem		  - activate this driver with CONFIG_SYS_I2C_MXC
2036fac96408Strem		  - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED
2037fac96408Strem		  - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE
2038fac96408Strem		  - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED
2039fac96408Strem		  - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE
2040fac96408Strem		  - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED
2041fac96408Strem		  - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
2042fac96408Strem		If thoses defines are not set, default value is 100000
2043fac96408Strem		for speed, and 0 for slave.
2044fac96408Strem
20451086bfa9SNobuhiro Iwamatsu		- drivers/i2c/rcar_i2c.c:
20461086bfa9SNobuhiro Iwamatsu		  - activate this driver with CONFIG_SYS_I2C_RCAR
20471086bfa9SNobuhiro Iwamatsu		  - This driver adds 4 i2c buses
20481086bfa9SNobuhiro Iwamatsu
20491086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0
20501086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0
20511086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1
20521086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1
20531086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2
20541086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2
20551086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3
20561086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3
20571086bfa9SNobuhiro Iwamatsu		  - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses
20581086bfa9SNobuhiro Iwamatsu
20593f4978c7SHeiko Schocher		additional defines:
20603f4978c7SHeiko Schocher
20613f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES
20623f4978c7SHeiko Schocher		Hold the number of i2c busses you want to use. If you
20633f4978c7SHeiko Schocher		don't use/have i2c muxes on your i2c bus, this
20643f4978c7SHeiko Schocher		is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
20653f4978c7SHeiko Schocher		omit this define.
20663f4978c7SHeiko Schocher
20673f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS
20683f4978c7SHeiko Schocher		define this, if you don't use i2c muxes on your hardware.
20693f4978c7SHeiko Schocher		if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
20703f4978c7SHeiko Schocher		omit this define.
20713f4978c7SHeiko Schocher
20723f4978c7SHeiko Schocher		CONFIG_SYS_I2C_MAX_HOPS
20733f4978c7SHeiko Schocher		define how many muxes are maximal consecutively connected
20743f4978c7SHeiko Schocher		on one i2c bus. If you not use i2c muxes, omit this
20753f4978c7SHeiko Schocher		define.
20763f4978c7SHeiko Schocher
20773f4978c7SHeiko Schocher		CONFIG_SYS_I2C_BUSES
20783f4978c7SHeiko Schocher		hold a list of busses you want to use, only used if
20793f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
20803f4978c7SHeiko Schocher		a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
20813f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES = 9:
20823f4978c7SHeiko Schocher
20833f4978c7SHeiko Schocher		 CONFIG_SYS_I2C_BUSES	{{0, {I2C_NULL_HOP}}, \
20843f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
20853f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
20863f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
20873f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
20883f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
20893f4978c7SHeiko Schocher					{1, {I2C_NULL_HOP}}, \
20903f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
20913f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
20923f4978c7SHeiko Schocher					}
20933f4978c7SHeiko Schocher
20943f4978c7SHeiko Schocher		which defines
20953f4978c7SHeiko Schocher			bus 0 on adapter 0 without a mux
2096ea818dbbSHeiko Schocher			bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
2097ea818dbbSHeiko Schocher			bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
2098ea818dbbSHeiko Schocher			bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
2099ea818dbbSHeiko Schocher			bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
2100ea818dbbSHeiko Schocher			bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
21013f4978c7SHeiko Schocher			bus 6 on adapter 1 without a mux
2102ea818dbbSHeiko Schocher			bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
2103ea818dbbSHeiko Schocher			bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
21043f4978c7SHeiko Schocher
21053f4978c7SHeiko Schocher		If you do not have i2c muxes on your board, omit this define.
21063f4978c7SHeiko Schocher
2107ea818dbbSHeiko Schocher- Legacy I2C Support:	CONFIG_HARD_I2C
21083f4978c7SHeiko Schocher
21093f4978c7SHeiko Schocher		NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
21103f4978c7SHeiko Schocher		provides the following compelling advantages:
21113f4978c7SHeiko Schocher
21123f4978c7SHeiko Schocher		- more than one i2c adapter is usable
21133f4978c7SHeiko Schocher		- approved multibus support
21143f4978c7SHeiko Schocher		- better i2c mux support
21153f4978c7SHeiko Schocher
21163f4978c7SHeiko Schocher		** Please consider updating your I2C driver now. **
21173f4978c7SHeiko Schocher
2118ea818dbbSHeiko Schocher		These enable legacy I2C serial bus commands. Defining
2119ea818dbbSHeiko Schocher		CONFIG_HARD_I2C will include the appropriate I2C driver
2120ea818dbbSHeiko Schocher		for the selected CPU.
2121c609719bSwdenk
2122b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
2123602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
2124b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
2125b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
2126c609719bSwdenk		command line interface.
2127c609719bSwdenk
2128bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
2129c609719bSwdenk
2130b37c7e5eSwdenk		There are several other quantities that must also be
2131ea818dbbSHeiko Schocher		defined when you define CONFIG_HARD_I2C.
2132c609719bSwdenk
21336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
2134b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
21356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
213611ccc33fSMarcel Ziswiler		the CPU's i2c node address).
2137c609719bSwdenk
21388d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
2139a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
21408d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
21418d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
21428d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
2143b37c7e5eSwdenk
21445da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
21455da71efaSEric Millbrandt
21465da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
21475da71efaSEric Millbrandt		chips might think that the current transfer is still
21485da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
21495da71efaSEric Millbrandt		commands until the slave device responds.
21505da71efaSEric Millbrandt
2151b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
2152b37c7e5eSwdenk
2153ea818dbbSHeiko Schocher		If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
2154b37c7e5eSwdenk		then the following macros need to be defined (examples are
2155b37c7e5eSwdenk		from include/configs/lwmon.h):
2156c609719bSwdenk
2157c609719bSwdenk		I2C_INIT
2158c609719bSwdenk
2159b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
2160c609719bSwdenk		controller or configure ports.
2161c609719bSwdenk
2162b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
2163b37c7e5eSwdenk
2164c609719bSwdenk		I2C_PORT
2165c609719bSwdenk
2166c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
2167c609719bSwdenk		assumes both bits are on the same port). Valid values
2168c609719bSwdenk		are 0..3 for ports A..D.
2169c609719bSwdenk
2170c609719bSwdenk		I2C_ACTIVE
2171c609719bSwdenk
2172c609719bSwdenk		The code necessary to make the I2C data line active
2173c609719bSwdenk		(driven).  If the data line is open collector, this
2174c609719bSwdenk		define can be null.
2175c609719bSwdenk
2176b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
2177b37c7e5eSwdenk
2178c609719bSwdenk		I2C_TRISTATE
2179c609719bSwdenk
2180c609719bSwdenk		The code necessary to make the I2C data line tri-stated
2181c609719bSwdenk		(inactive).  If the data line is open collector, this
2182c609719bSwdenk		define can be null.
2183c609719bSwdenk
2184b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2185b37c7e5eSwdenk
2186c609719bSwdenk		I2C_READ
2187c609719bSwdenk
2188472d5460SYork Sun		Code that returns true if the I2C data line is high,
2189472d5460SYork Sun		false if it is low.
2190c609719bSwdenk
2191b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2192b37c7e5eSwdenk
2193c609719bSwdenk		I2C_SDA(bit)
2194c609719bSwdenk
2195472d5460SYork Sun		If <bit> is true, sets the I2C data line high. If it
2196472d5460SYork Sun		is false, it clears it (low).
2197c609719bSwdenk
2198b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
2199b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
2200b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
2201b37c7e5eSwdenk
2202c609719bSwdenk		I2C_SCL(bit)
2203c609719bSwdenk
2204472d5460SYork Sun		If <bit> is true, sets the I2C clock line high. If it
2205472d5460SYork Sun		is false, it clears it (low).
2206c609719bSwdenk
2207b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
2208b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
2209b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
2210b37c7e5eSwdenk
2211c609719bSwdenk		I2C_DELAY
2212c609719bSwdenk
2213c609719bSwdenk		This delay is invoked four times per clock cycle so this
2214c609719bSwdenk		controls the rate of data transfer.  The data rate thus
2215b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
2216b37c7e5eSwdenk		like:
2217b37c7e5eSwdenk
2218b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
2219c609719bSwdenk
2220793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2221793b5726SMike Frysinger
2222793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
2223793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
2224793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
2225793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
2226793b5726SMike Frysinger
2227793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
2228793b5726SMike Frysinger		the generic GPIO functions.
2229793b5726SMike Frysinger
22306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
223147cd00faSwdenk
223247cd00faSwdenk		When a board is reset during an i2c bus transfer
223347cd00faSwdenk		chips might think that the current transfer is still
223447cd00faSwdenk		in progress. On some boards it is possible to access
223547cd00faSwdenk		the i2c SCLK line directly, either by using the
223647cd00faSwdenk		processor pin as a GPIO or by having a second pin
223747cd00faSwdenk		connected to the bus. If this option is defined a
223847cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
223947cd00faSwdenk		is run early in the boot sequence.
224047cd00faSwdenk
224126a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
224226a33504SRichard Retanubun
224326a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
224426a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
224526a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
224626a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
224726a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
224826a33504SRichard Retanubun		controller provide such a method. It is called at the end of
224926a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
225026a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
225126a33504SRichard Retanubun
225217ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
225317ea1177Swdenk
225417ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
225517ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
225617ea1177Swdenk		variable "i2cfast". (see also i2cfast)
225717ea1177Swdenk
2258bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
2259bb99ad6dSBen Warren
2260bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
2261bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
2262bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
2263bb99ad6dSBen Warren		Note that bus numbering is zero-based.
2264bb99ad6dSBen Warren
22656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
2266bb99ad6dSBen Warren
2267bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
22680f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
22690f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
22700f89c54bSPeter Tyser		a 1D array of device addresses
2271bb99ad6dSBen Warren
2272bb99ad6dSBen Warren		e.g.
2273bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
22746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2275bb99ad6dSBen Warren
2276bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
2277bb99ad6dSBen Warren
2278bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
22796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
2280bb99ad6dSBen Warren
2281bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2282bb99ad6dSBen Warren
22836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
2284be5e6181STimur Tabi
2285be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
2286be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2287be5e6181STimur Tabi
22886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
22890dc018ecSStefan Roese
22900dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
22910dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
22920dc018ecSStefan Roese
22936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
22940dc018ecSStefan Roese
22950dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
22960dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
22970dc018ecSStefan Roese
22986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
22999ebbb54fSVictor Gallardo
23009ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
23019ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
23029ebbb54fSVictor Gallardo		specified DTT device.
23039ebbb54fSVictor Gallardo
23042ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
23052ac6985aSAndrew Dyer
23062ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
23072ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
23082ac6985aSAndrew Dyer		between writing the address pointer and reading the
23092ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
23102ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
23112ac6985aSAndrew Dyer		devices can use either method, but some require one or
23122ac6985aSAndrew Dyer		the other.
2313be5e6181STimur Tabi
2314c609719bSwdenk- SPI Support:	CONFIG_SPI
2315c609719bSwdenk
2316c609719bSwdenk		Enables SPI driver (so far only tested with
2317c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2318c609719bSwdenk		D/As on the SACSng board)
2319c609719bSwdenk
23206639562eSYoshihiro Shimoda		CONFIG_SH_SPI
23216639562eSYoshihiro Shimoda
23226639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
23236639562eSYoshihiro Shimoda		only SH7757 is supported.
23246639562eSYoshihiro Shimoda
2325c609719bSwdenk		CONFIG_SPI_X
2326c609719bSwdenk
2327c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2328c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2329c609719bSwdenk
2330c609719bSwdenk		CONFIG_SOFT_SPI
2331c609719bSwdenk
2332c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2333c609719bSwdenk		using hardware support. This is a general purpose
2334c609719bSwdenk		driver that only requires three general I/O port pins
2335c609719bSwdenk		(two outputs, one input) to function. If this is
2336c609719bSwdenk		defined, the board configuration must define several
2337c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2338c609719bSwdenk		an example, see include/configs/sacsng.h.
2339c609719bSwdenk
234004a9e118SBen Warren		CONFIG_HARD_SPI
234104a9e118SBen Warren
234204a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
234304a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
234404a9e118SBen Warren		must define a list of chip-select function pointers.
234504a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
234604a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
234704a9e118SBen Warren
234838254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
234938254f45SGuennadi Liakhovetski
235038254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
23512e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
235238254f45SGuennadi Liakhovetski
23530133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
23540133502eSMatthias Fuchs
23550133502eSMatthias Fuchs		Enables FPGA subsystem.
23560133502eSMatthias Fuchs
23570133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
23580133502eSMatthias Fuchs
23590133502eSMatthias Fuchs		Enables support for specific chip vendors.
23600133502eSMatthias Fuchs		(ALTERA, XILINX)
23610133502eSMatthias Fuchs
23620133502eSMatthias Fuchs		CONFIG_FPGA_<family>
23630133502eSMatthias Fuchs
23640133502eSMatthias Fuchs		Enables support for FPGA family.
23650133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
23660133502eSMatthias Fuchs
23670133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2368c609719bSwdenk
2369c609719bSwdenk		Specify the number of FPGA devices to support.
2370c609719bSwdenk
23716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2372c609719bSwdenk
2373c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2374c609719bSwdenk
23756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2376c609719bSwdenk
2377c609719bSwdenk		Enable checks on FPGA configuration interface busy
2378c609719bSwdenk		status by the configuration function. This option
2379c609719bSwdenk		will require a board or device specific function to
2380c609719bSwdenk		be written.
2381c609719bSwdenk
2382c609719bSwdenk		CONFIG_FPGA_DELAY
2383c609719bSwdenk
2384c609719bSwdenk		If defined, a function that provides delays in the FPGA
2385c609719bSwdenk		configuration driver.
2386c609719bSwdenk
23876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2388c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2389c609719bSwdenk
23906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2391c609719bSwdenk
2392c609719bSwdenk		Check for configuration errors during FPGA bitfile
2393c609719bSwdenk		loading. For example, abort during Virtex II
2394c609719bSwdenk		configuration if the INIT_B line goes low (which
2395c609719bSwdenk		indicated a CRC error).
2396c609719bSwdenk
23976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2398c609719bSwdenk
2399c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2400c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2401c609719bSwdenk		FPGA configuration sequence. The default time is 500
240211ccc33fSMarcel Ziswiler		ms.
2403c609719bSwdenk
24046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2405c609719bSwdenk
2406c609719bSwdenk		Maximum time to wait for BUSY to deassert during
240711ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2408c609719bSwdenk
24096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2410c609719bSwdenk
2411c609719bSwdenk		Time to wait after FPGA configuration. The default is
241211ccc33fSMarcel Ziswiler		200 ms.
2413c609719bSwdenk
2414c609719bSwdenk- Configuration Management:
2415c609719bSwdenk		CONFIG_IDENT_STRING
2416c609719bSwdenk
2417c609719bSwdenk		If defined, this string will be added to the U-Boot
2418c609719bSwdenk		version information (U_BOOT_VERSION)
2419c609719bSwdenk
2420c609719bSwdenk- Vendor Parameter Protection:
2421c609719bSwdenk
2422c609719bSwdenk		U-Boot considers the values of the environment
2423c609719bSwdenk		variables "serial#" (Board Serial Number) and
24247152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2425c609719bSwdenk		are set once by the board vendor / manufacturer, and
2426c609719bSwdenk		protects these variables from casual modification by
2427c609719bSwdenk		the user. Once set, these variables are read-only,
2428c609719bSwdenk		and write or delete attempts are rejected. You can
242911ccc33fSMarcel Ziswiler		change this behaviour:
2430c609719bSwdenk
2431c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2432c609719bSwdenk		file, the write protection for vendor parameters is
243347cd00faSwdenk		completely disabled. Anybody can change or delete
2434c609719bSwdenk		these parameters.
2435c609719bSwdenk
2436c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2437c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
243811ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2439c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2440c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2441c609719bSwdenk		read-only.]
2442c609719bSwdenk
24432598090bSJoe Hershberger		The same can be accomplished in a more flexible way
24442598090bSJoe Hershberger		for any variable by configuring the type of access
24452598090bSJoe Hershberger		to allow for those variables in the ".flags" variable
24462598090bSJoe Hershberger		or define CONFIG_ENV_FLAGS_LIST_STATIC.
24472598090bSJoe Hershberger
2448c609719bSwdenk- Protected RAM:
2449c609719bSwdenk		CONFIG_PRAM
2450c609719bSwdenk
2451c609719bSwdenk		Define this variable to enable the reservation of
2452c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2453c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2454c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2455c609719bSwdenk		this default value by defining an environment
2456c609719bSwdenk		variable "pram" to the number of kB you want to
2457c609719bSwdenk		reserve. Note that the board info structure will
2458c609719bSwdenk		still show the full amount of RAM. If pRAM is
2459c609719bSwdenk		reserved, a new environment variable "mem" will
2460c609719bSwdenk		automatically be defined to hold the amount of
2461c609719bSwdenk		remaining RAM in a form that can be passed as boot
2462c609719bSwdenk		argument to Linux, for instance like that:
2463c609719bSwdenk
2464fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2465c609719bSwdenk			saveenv
2466c609719bSwdenk
2467c609719bSwdenk		This way you can tell Linux not to use this memory,
2468c609719bSwdenk		either, which results in a memory region that will
2469c609719bSwdenk		not be affected by reboots.
2470c609719bSwdenk
2471c609719bSwdenk		*WARNING* If your board configuration uses automatic
2472c609719bSwdenk		detection of the RAM size, you must make sure that
2473c609719bSwdenk		this memory test is non-destructive. So far, the
2474c609719bSwdenk		following board configurations are known to be
2475c609719bSwdenk		"pRAM-clean":
2476c609719bSwdenk
24771b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
24781b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2479544d97e9SWolfgang Denk			FLAGADM, TQM8260
2480c609719bSwdenk
248140fef049SGabe Black- Access to physical memory region (> 4GB)
248240fef049SGabe Black		Some basic support is provided for operations on memory not
248340fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
248440fef049SGabe Black		support access to more than 4GB of memory on 32-bit
248540fef049SGabe Black		machines using physical address extension or similar.
248640fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
248740fef049SGabe Black		currently only supports clearing the memory.
248840fef049SGabe Black
2489c609719bSwdenk- Error Recovery:
2490c609719bSwdenk		CONFIG_PANIC_HANG
2491c609719bSwdenk
2492c609719bSwdenk		Define this variable to stop the system in case of a
2493c609719bSwdenk		fatal error, so that you have to reset it manually.
2494c609719bSwdenk		This is probably NOT a good idea for an embedded
249511ccc33fSMarcel Ziswiler		system where you want the system to reboot
2496c609719bSwdenk		automatically as fast as possible, but it may be
2497c609719bSwdenk		useful during development since you can try to debug
2498c609719bSwdenk		the conditions that lead to the situation.
2499c609719bSwdenk
2500c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2501c609719bSwdenk
2502c609719bSwdenk		This variable defines the number of retries for
2503c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2504c609719bSwdenk		before giving up the operation. If not defined, a
2505c609719bSwdenk		default value of 5 is used.
2506c609719bSwdenk
250740cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
250840cb90eeSGuennadi Liakhovetski
250940cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
251040cb90eeSGuennadi Liakhovetski
251148a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
251248a3e999STetsuyuki Kobayashi
251348a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
251448a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
251548a3e999STetsuyuki Kobayashi		try longer timeout such as
251648a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
251748a3e999STetsuyuki Kobayashi
2518c609719bSwdenk- Command Interpreter:
25198078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
252004a85b3bSwdenk
252104a85b3bSwdenk		Enable auto completion of commands using TAB.
252204a85b3bSwdenk
25238078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
25248078f1a5SWolfgang Denk		for the "hush" shell.
25258078f1a5SWolfgang Denk
25268078f1a5SWolfgang Denk
25276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2528c609719bSwdenk
2529c609719bSwdenk		Define this variable to enable the "hush" shell (from
2530c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2531c609719bSwdenk		powerful command line syntax like
2532c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2533c609719bSwdenk		constructs ("shell scripts").
2534c609719bSwdenk
2535c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2536c609719bSwdenk		with a somewhat smaller memory footprint.
2537c609719bSwdenk
2538c609719bSwdenk
25396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2540c609719bSwdenk
2541c609719bSwdenk		This defines the secondary prompt string, which is
2542c609719bSwdenk		printed when the command interpreter needs more input
2543c609719bSwdenk		to complete a command. Usually "> ".
2544c609719bSwdenk
2545c609719bSwdenk	Note:
2546c609719bSwdenk
2547c609719bSwdenk		In the current implementation, the local variables
2548c609719bSwdenk		space and global environment variables space are
2549c609719bSwdenk		separated. Local variables are those you define by
25503b57fe0aSwdenk		simply typing `name=value'. To access a local
2551c609719bSwdenk		variable later on, you have write `$name' or
25523b57fe0aSwdenk		`${name}'; to execute the contents of a variable
25533b57fe0aSwdenk		directly type `$name' at the command prompt.
2554c609719bSwdenk
2555c609719bSwdenk		Global environment variables are those you use
2556c609719bSwdenk		setenv/printenv to work with. To run a command stored
2557c609719bSwdenk		in such a variable, you need to use the run command,
2558c609719bSwdenk		and you must not use the '$' sign to access them.
2559c609719bSwdenk
2560c609719bSwdenk		To store commands and special characters in a
2561c609719bSwdenk		variable, please use double quotation marks
2562c609719bSwdenk		surrounding the whole text of the variable, instead
2563c609719bSwdenk		of the backslashes before semicolons and special
2564c609719bSwdenk		symbols.
2565c609719bSwdenk
2566aa0c71acSWolfgang Denk- Commandline Editing and History:
2567aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2568aa0c71acSWolfgang Denk
256911ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2570aa0c71acSWolfgang Denk		commandline input operations
2571aa0c71acSWolfgang Denk
2572a8c7c708Swdenk- Default Environment:
2573c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2574c609719bSwdenk
2575c609719bSwdenk		Define this to contain any number of null terminated
2576c609719bSwdenk		strings (variable = value pairs) that will be part of
25777152b1d0Swdenk		the default environment compiled into the boot image.
25782262cfeeSwdenk
2579c609719bSwdenk		For example, place something like this in your
2580c609719bSwdenk		board's config file:
2581c609719bSwdenk
2582c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2583c609719bSwdenk			"myvar1=value1\0" \
2584c609719bSwdenk			"myvar2=value2\0"
2585c609719bSwdenk
2586c609719bSwdenk		Warning: This method is based on knowledge about the
2587c609719bSwdenk		internal format how the environment is stored by the
25882262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2589c609719bSwdenk		interface! Although it is unlikely that this format
25907152b1d0Swdenk		will change soon, there is no guarantee either.
2591c609719bSwdenk		You better know what you are doing here.
2592c609719bSwdenk
2593c609719bSwdenk		Note: overly (ab)use of the default environment is
2594c609719bSwdenk		discouraged. Make sure to check other ways to preset
259574de7aefSWolfgang Denk		the environment like the "source" command or the
2596c609719bSwdenk		boot command first.
2597c609719bSwdenk
25985e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
25995e724ca2SStephen Warren
26005e724ca2SStephen Warren		Define this in order to add variables describing the
26015e724ca2SStephen Warren		U-Boot build configuration to the default environment.
26025e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
26035e724ca2SStephen Warren
26045e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
26055e724ca2SStephen Warren
26065e724ca2SStephen Warren		- CONFIG_SYS_ARCH
26075e724ca2SStephen Warren		- CONFIG_SYS_CPU
26085e724ca2SStephen Warren		- CONFIG_SYS_BOARD
26095e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
26105e724ca2SStephen Warren		- CONFIG_SYS_SOC
26115e724ca2SStephen Warren
26127e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
26137e27f89fSTom Rini
26147e27f89fSTom Rini		Define this in order to add variables describing certain
26157e27f89fSTom Rini		run-time determined information about the hardware to the
26167e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
26177e27f89fSTom Rini
261806fd8538SSimon Glass		CONFIG_DELAY_ENVIRONMENT
261906fd8538SSimon Glass
262006fd8538SSimon Glass		Normally the environment is loaded when the board is
262106fd8538SSimon Glass		intialised so that it is available to U-Boot. This inhibits
262206fd8538SSimon Glass		that so that the environment is not available until
262306fd8538SSimon Glass		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
262406fd8538SSimon Glass		this is instead controlled by the value of
262506fd8538SSimon Glass		/config/load-environment.
262606fd8538SSimon Glass
2627a8c7c708Swdenk- DataFlash Support:
26282abbe075Swdenk		CONFIG_HAS_DATAFLASH
26292abbe075Swdenk
26302abbe075Swdenk		Defining this option enables DataFlash features and
26312abbe075Swdenk		allows to read/write in Dataflash via the standard
26322abbe075Swdenk		commands cp, md...
26332abbe075Swdenk
2634f61ec45eSEric Nelson- Serial Flash support
2635f61ec45eSEric Nelson		CONFIG_CMD_SF
2636f61ec45eSEric Nelson
2637f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2638f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2639f61ec45eSEric Nelson
2640f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2641f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2642f61ec45eSEric Nelson		commands.
2643f61ec45eSEric Nelson
2644f61ec45eSEric Nelson		The following defaults may be provided by the platform
2645f61ec45eSEric Nelson		to handle the common case when only a single serial
2646f61ec45eSEric Nelson		flash is present on the system.
2647f61ec45eSEric Nelson
2648f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2649f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2650f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2651f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2652f61ec45eSEric Nelson
265324007273SSimon Glass		CONFIG_CMD_SF_TEST
265424007273SSimon Glass
265524007273SSimon Glass		Define this option to include a destructive SPI flash
265624007273SSimon Glass		test ('sf test').
265724007273SSimon Glass
26581dcd6d03SJagannadha Sutradharudu Teki		CONFIG_SPI_FLASH_BAR		Ban/Extended Addr Reg
26591dcd6d03SJagannadha Sutradharudu Teki
26601dcd6d03SJagannadha Sutradharudu Teki		Define this option to use the Bank addr/Extended addr
26611dcd6d03SJagannadha Sutradharudu Teki		support on SPI flashes which has size > 16Mbytes.
26621dcd6d03SJagannadha Sutradharudu Teki
26633f85ce27Swdenk- SystemACE Support:
26643f85ce27Swdenk		CONFIG_SYSTEMACE
26653f85ce27Swdenk
26663f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
26673f85ce27Swdenk		chips attached via some sort of local bus. The address
266811ccc33fSMarcel Ziswiler		of the chip must also be defined in the
26696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
26703f85ce27Swdenk
26713f85ce27Swdenk		#define CONFIG_SYSTEMACE
26726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
26733f85ce27Swdenk
26743f85ce27Swdenk		When SystemACE support is added, the "ace" device type
26753f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
26763f85ce27Swdenk
2677ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2678ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2679ecb0ccd9SWolfgang Denk
268028cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2681ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
268228cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2683ecb0ccd9SWolfgang Denk		number generator is used.
2684ecb0ccd9SWolfgang Denk
268528cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
268628cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
268728cb9375SWolfgang Denk		defined, the normal port 69 is used.
268828cb9375SWolfgang Denk
268928cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2690ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2691ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2692ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2693ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2694ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2695ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2696ecb0ccd9SWolfgang Denk
2697bf36c5d5SSimon Glass- Hashing support:
2698bf36c5d5SSimon Glass		CONFIG_CMD_HASH
2699bf36c5d5SSimon Glass
2700bf36c5d5SSimon Glass		This enables a generic 'hash' command which can produce
2701bf36c5d5SSimon Glass		hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2702bf36c5d5SSimon Glass
2703bf36c5d5SSimon Glass		CONFIG_HASH_VERIFY
2704bf36c5d5SSimon Glass
2705bf36c5d5SSimon Glass		Enable the hash verify command (hash -v). This adds to code
2706bf36c5d5SSimon Glass		size a little.
2707bf36c5d5SSimon Glass
2708bf36c5d5SSimon Glass		CONFIG_SHA1 - support SHA1 hashing
2709bf36c5d5SSimon Glass		CONFIG_SHA256 - support SHA256 hashing
2710bf36c5d5SSimon Glass
2711bf36c5d5SSimon Glass		Note: There is also a sha1sum command, which should perhaps
2712bf36c5d5SSimon Glass		be deprecated in favour of 'hash sha1'.
2713bf36c5d5SSimon Glass
2714a11f1873SRobert Winkler- Freescale i.MX specific commands:
2715a11f1873SRobert Winkler		CONFIG_CMD_HDMIDETECT
2716a11f1873SRobert Winkler		This enables 'hdmidet' command which returns true if an
2717a11f1873SRobert Winkler		HDMI monitor is detected.  This command is i.MX 6 specific.
2718a11f1873SRobert Winkler
2719a11f1873SRobert Winkler		CONFIG_CMD_BMODE
2720a11f1873SRobert Winkler		This enables the 'bmode' (bootmode) command for forcing
2721a11f1873SRobert Winkler		a boot from specific media.
2722a11f1873SRobert Winkler
2723a11f1873SRobert Winkler		This is useful for forcing the ROM's usb downloader to
2724a11f1873SRobert Winkler		activate upon a watchdog reset which is nice when iterating
2725a11f1873SRobert Winkler		on U-Boot.  Using the reset button or running bmode normal
2726a11f1873SRobert Winkler		will set it back to normal.  This command currently
2727a11f1873SRobert Winkler		supports i.MX53 and i.MX6.
2728a11f1873SRobert Winkler
272919c402afSSimon Glass- Signing support:
273019c402afSSimon Glass		CONFIG_RSA
273119c402afSSimon Glass
273219c402afSSimon Glass		This enables the RSA algorithm used for FIT image verification
273319c402afSSimon Glass		in U-Boot. See doc/uImage/signature for more information.
273419c402afSSimon Glass
273519c402afSSimon Glass		The signing part is build into mkimage regardless of this
273619c402afSSimon Glass		option.
273719c402afSSimon Glass
273819c402afSSimon Glass
2739a8c7c708Swdenk- Show boot progress:
2740c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2741c609719bSwdenk
2742c609719bSwdenk		Defining this option allows to add some board-
2743c609719bSwdenk		specific code (calling a user-provided function
2744c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2745c609719bSwdenk		the system's boot progress on some display (for
2746c609719bSwdenk		example, some LED's) on your board. At the moment,
2747c609719bSwdenk		the following checkpoints are implemented:
2748c609719bSwdenk
27493a608ca0SSimon Glass- Detailed boot stage timing
27503a608ca0SSimon Glass		CONFIG_BOOTSTAGE
27513a608ca0SSimon Glass		Define this option to get detailed timing of each stage
27523a608ca0SSimon Glass		of the boot process.
27533a608ca0SSimon Glass
27543a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
27553a608ca0SSimon Glass		This is the number of available user bootstage records.
27563a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
27573a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
27583a608ca0SSimon Glass		the limit, recording will stop.
27593a608ca0SSimon Glass
27603a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
27613a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
27623a608ca0SSimon Glass
27633a608ca0SSimon Glass		Timer summary in microseconds:
27643a608ca0SSimon Glass		       Mark    Elapsed  Stage
27653a608ca0SSimon Glass			  0          0  reset
27663a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
27673a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
27683a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
27693a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
27703a608ca0SSimon Glass		  3,910,375    250,777  main_loop
27713a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
27723a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
27733a608ca0SSimon Glass
27742eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
27752eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
27762eba38cfSSimon Glass		and un/stashing of bootstage data.
27772eba38cfSSimon Glass
277894fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
277994fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
278094fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
278194fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
278294fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
278394fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
278494fd1316SSimon Glass		For example:
278594fd1316SSimon Glass
278694fd1316SSimon Glass		bootstage {
278794fd1316SSimon Glass			154 {
278894fd1316SSimon Glass				name = "board_init_f";
278994fd1316SSimon Glass				mark = <3575678>;
279094fd1316SSimon Glass			};
279194fd1316SSimon Glass			170 {
279294fd1316SSimon Glass				name = "lcd";
279394fd1316SSimon Glass				accum = <33482>;
279494fd1316SSimon Glass			};
279594fd1316SSimon Glass		};
279694fd1316SSimon Glass
279794fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
279894fd1316SSimon Glass
27991372cce2SMarian BalakowiczLegacy uImage format:
28001372cce2SMarian Balakowicz
2801c609719bSwdenk  Arg	Where			When
2802c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2803c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2804c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2805c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2806c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2807c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2808c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2809c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2810c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
28111372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2812c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2813c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2814c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2815c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
28161372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2817c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
28181372cce2SMarian Balakowicz
28191372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
28201372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
28211372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
28221372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
28231372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
28241372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
28251372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
282611ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
28271372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
28281372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
28291372cce2SMarian Balakowicz
2830ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2831c609719bSwdenk
2832a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
283363e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
283463e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
283563e73c9aSwdenk
2836566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2837566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2838566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2839566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2840566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2841566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2842566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2843566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2844566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2845566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2846566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2847566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2848566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2849566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2850566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2851566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2852566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2853566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2854566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2855566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2856566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2857566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2858566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2859566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2860566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2861566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2862566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2863566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2864566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2865566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2866566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2867566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2868566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2869566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2870566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2871566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2872566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2873566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2874566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2875566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2876566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2877566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2878566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2879566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2880566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2881566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2882566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2883c609719bSwdenk
2884566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2885c609719bSwdenk
2886566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2887566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2888566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2889206c60cbSwdenk
2890566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2891566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
289211ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2893566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2894566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2895566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
289674de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
289774de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2898566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2899c609719bSwdenk
29001372cce2SMarian BalakowiczFIT uImage format:
29011372cce2SMarian Balakowicz
29021372cce2SMarian Balakowicz  Arg	Where			When
29031372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
29041372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
29051372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
29061372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
29071372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
29081372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2909f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
29101372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
29111372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
29121372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
29131372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
29141372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
291511ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
291611ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
29171372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
29181372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
29191372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
29201372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
29211372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
29221372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
29231372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
29241372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
29251372cce2SMarian Balakowicz
29261372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
29271372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
29281372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
292911ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
29301372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
29311372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
29321372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
29331372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
29341372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
29351372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
29361372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
29371372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
29381372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
29391372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
29401372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
29411372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
29421372cce2SMarian Balakowicz
294311ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
29441372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
29451372cce2SMarian Balakowicz
294611ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
29471372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
29481372cce2SMarian Balakowicz
294911ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
29501372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
29511372cce2SMarian Balakowicz
2952d95f6ec7SGabe Black- FIT image support:
2953d95f6ec7SGabe Black		CONFIG_FIT
2954d95f6ec7SGabe Black		Enable support for the FIT uImage format.
2955d95f6ec7SGabe Black
2956d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
2957d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
2958d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
2959d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
2960d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
2961d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
2962d95f6ec7SGabe Black
29633e569a6bSSimon Glass		CONFIG_FIT_SIGNATURE
29643e569a6bSSimon Glass		This option enables signature verification of FIT uImages,
29653e569a6bSSimon Glass		using a hash signed and verified using RSA. See
29663e569a6bSSimon Glass		doc/uImage.FIT/signature.txt for more details.
29673e569a6bSSimon Glass
29684cf2609bSWolfgang Denk- Standalone program support:
29694cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
29704cf2609bSWolfgang Denk
29716feff899SWolfgang Denk		This option defines a board specific value for the
29726feff899SWolfgang Denk		address where standalone program gets loaded, thus
29736feff899SWolfgang Denk		overwriting the architecture dependent default
29744cf2609bSWolfgang Denk		settings.
29754cf2609bSWolfgang Denk
29764cf2609bSWolfgang Denk- Frame Buffer Address:
29774cf2609bSWolfgang Denk		CONFIG_FB_ADDR
29784cf2609bSWolfgang Denk
29794cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
298044a53b57SWolfgang Denk		address for frame buffer.  This is typically the case
298144a53b57SWolfgang Denk		when using a graphics controller has separate video
298244a53b57SWolfgang Denk		memory.  U-Boot will then place the frame buffer at
298344a53b57SWolfgang Denk		the given address instead of dynamically reserving it
298444a53b57SWolfgang Denk		in system RAM by calling lcd_setmem(), which grabs
298544a53b57SWolfgang Denk		the memory for the frame buffer depending on the
298644a53b57SWolfgang Denk		configured panel size.
29874cf2609bSWolfgang Denk
29884cf2609bSWolfgang Denk		Please see board_init_f function.
29894cf2609bSWolfgang Denk
2990cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2991cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2992cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2993cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2994cccfc2abSDetlev Zundel
2995cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2996cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2997cccfc2abSDetlev Zundel
2998cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2999cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
3000cccfc2abSDetlev Zundel
3001cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
3002cccfc2abSDetlev Zundel		Needed for mtdparts command support.
3003cccfc2abSDetlev Zundel
3004cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
3005cccfc2abSDetlev Zundel
3006cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
3007cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
3008cccfc2abSDetlev Zundel
300970c219cdSJoe Hershberger- UBI support
301070c219cdSJoe Hershberger		CONFIG_CMD_UBI
301170c219cdSJoe Hershberger
301270c219cdSJoe Hershberger		Adds commands for interacting with MTD partitions formatted
301370c219cdSJoe Hershberger		with the UBI flash translation layer
301470c219cdSJoe Hershberger
301570c219cdSJoe Hershberger		Requires also defining CONFIG_RBTREE
301670c219cdSJoe Hershberger
3017147162daSJoe Hershberger		CONFIG_UBI_SILENCE_MSG
3018147162daSJoe Hershberger
3019147162daSJoe Hershberger		Make the verbose messages from UBI stop printing.  This leaves
3020147162daSJoe Hershberger		warnings and errors enabled.
3021147162daSJoe Hershberger
302270c219cdSJoe Hershberger- UBIFS support
302370c219cdSJoe Hershberger		CONFIG_CMD_UBIFS
302470c219cdSJoe Hershberger
302570c219cdSJoe Hershberger		Adds commands for interacting with UBI volumes formatted as
302670c219cdSJoe Hershberger		UBIFS.  UBIFS is read-only in u-boot.
302770c219cdSJoe Hershberger
302870c219cdSJoe Hershberger		Requires UBI support as well as CONFIG_LZO
302970c219cdSJoe Hershberger
3030147162daSJoe Hershberger		CONFIG_UBIFS_SILENCE_MSG
3031147162daSJoe Hershberger
3032147162daSJoe Hershberger		Make the verbose messages from UBIFS stop printing.  This leaves
3033147162daSJoe Hershberger		warnings and errors enabled.
3034147162daSJoe Hershberger
30356a11cf48SDaniel Schwierzeck- SPL framework
30366a11cf48SDaniel Schwierzeck		CONFIG_SPL
30376a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
30386a11cf48SDaniel Schwierzeck
303995579793STom Rini		CONFIG_SPL_LDSCRIPT
304095579793STom Rini		LDSCRIPT for linking the SPL binary.
304195579793STom Rini
30426ebc3461SAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT
30436ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL, BSS included.
30446ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory
30456ebc3461SAlbert ARIBAUD		used by SPL from _start to __bss_end does not exceed it.
30468960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
30476ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
30486ebc3461SAlbert ARIBAUD
304995579793STom Rini		CONFIG_SPL_MAX_SIZE
30506ebc3461SAlbert ARIBAUD		Maximum size of the SPL image (text, data, rodata, and
30516ebc3461SAlbert ARIBAUD		linker lists sections), BSS excluded.
30526ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual size does
30536ebc3461SAlbert ARIBAUD		not exceed it.
305495579793STom Rini
30556a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
30566a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
30576a11cf48SDaniel Schwierzeck
305894a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
305994a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
306094a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
306194a45bb1SScott Wood
306295579793STom Rini		CONFIG_SPL_BSS_START_ADDR
306395579793STom Rini		Link address for the BSS within the SPL binary.
306495579793STom Rini
306595579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
30666ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL BSS.
30676ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory used
30686ebc3461SAlbert ARIBAUD		by SPL from __bss_start to __bss_end does not exceed it.
30698960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
30706ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
307195579793STom Rini
307295579793STom Rini		CONFIG_SPL_STACK
307395579793STom Rini		Adress of the start of the stack SPL will use
307495579793STom Rini
307594a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
307694a45bb1SScott Wood		Adress of the start of the stack SPL will use after
307794a45bb1SScott Wood		relocation.  If unspecified, this is equal to
307894a45bb1SScott Wood		CONFIG_SPL_STACK.
307994a45bb1SScott Wood
308095579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
308195579793STom Rini		Starting address of the malloc pool used in SPL.
308295579793STom Rini
308395579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
308495579793STom Rini		The size of the malloc pool used in SPL.
30856a11cf48SDaniel Schwierzeck
308647f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
308747f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
308847f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
308947f7bcaeSTom Rini		NAND loading of the Linux Kernel.
309047f7bcaeSTom Rini
3091861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
3092861a86f4STom Rini		For ARM, enable an optional function to print more information
3093861a86f4STom Rini		about the running system.
3094861a86f4STom Rini
30954b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
30964b919725SScott Wood		Arch init code should be built for a very small image
30974b919725SScott Wood
30986a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
30996a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
31006a11cf48SDaniel Schwierzeck
31016a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
31026a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
31036a11cf48SDaniel Schwierzeck
31046a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
31056a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
31066a11cf48SDaniel Schwierzeck
31076a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
31086a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
31096a11cf48SDaniel Schwierzeck
31106a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
31116a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
31126a11cf48SDaniel Schwierzeck
311395579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
311495579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
311595579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
311695579793STom Rini		Address, size and partition on the MMC to load U-Boot from
311795579793STom Rini		when the MMC is being used in raw mode.
311895579793STom Rini
31192b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
31202b75b0adSPeter Korsgaard		Sector to load kernel uImage from when MMC is being
31212b75b0adSPeter Korsgaard		used in raw mode (for Falcon mode)
31222b75b0adSPeter Korsgaard
31232b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
31242b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
31252b75b0adSPeter Korsgaard		Sector and number of sectors to load kernel argument
31262b75b0adSPeter Korsgaard		parameters from when MMC is being used in raw mode
31272b75b0adSPeter Korsgaard		(for falcon mode)
31282b75b0adSPeter Korsgaard
312995579793STom Rini		CONFIG_SPL_FAT_SUPPORT
313095579793STom Rini		Support for fs/fat/libfat.o in SPL binary
313195579793STom Rini
313295579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
313395579793STom Rini		Filename to read to load U-Boot when reading from FAT
313495579793STom Rini
31357ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_KERNEL_NAME
31367ad2cc79SPeter Korsgaard		Filename to read to load kernel uImage when reading
31377ad2cc79SPeter Korsgaard		from FAT (for Falcon mode)
31387ad2cc79SPeter Korsgaard
31397ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_ARGS_NAME
31407ad2cc79SPeter Korsgaard		Filename to read to load kernel argument parameters
31417ad2cc79SPeter Korsgaard		when reading from FAT (for Falcon mode)
31427ad2cc79SPeter Korsgaard
314306f60ae3SScott Wood		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
314406f60ae3SScott Wood		Set this for NAND SPL on PPC mpc83xx targets, so that
314506f60ae3SScott Wood		start.S waits for the rest of the SPL to load before
314606f60ae3SScott Wood		continuing (the hardware starts execution after just
314706f60ae3SScott Wood		loading the first page rather than the full 4K).
314806f60ae3SScott Wood
31496f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
31506f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
31516f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
31526f2f01b9SScott Wood
31536f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
31546f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
31556f2f01b9SScott Wood
31566f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
31576f2f01b9SScott Wood		Include standard software ECC in the SPL
31586f2f01b9SScott Wood
315995579793STom Rini		CONFIG_SPL_NAND_SIMPLE
31607d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
31617d4b7955SScott Wood		expose the cmd_ctrl() interface.
316295579793STom Rini
3163bb0dc108SYing Zhang		CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
3164bb0dc108SYing Zhang		Set for the SPL on PPC mpc8xxx targets, support for
3165bb0dc108SYing Zhang		arch/powerpc/cpu/mpc8xxx/ddr/libddr.o in SPL binary.
3166bb0dc108SYing Zhang
31677c8eea59SYing Zhang		CONFIG_SPL_COMMON_INIT_DDR
31687c8eea59SYing Zhang		Set for common ddr init with serial presence detect in
31697c8eea59SYing Zhang		SPL binary.
31707c8eea59SYing Zhang
317195579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
317295579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
317395579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
317495579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
317595579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
317695579793STom Rini		Defines the size and behavior of the NAND that SPL uses
31777d4b7955SScott Wood		to read U-Boot
317895579793STom Rini
317995579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
31807d4b7955SScott Wood		Location in NAND to read U-Boot from
31817d4b7955SScott Wood
31827d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
31837d4b7955SScott Wood		Location in memory to load U-Boot to
31847d4b7955SScott Wood
31857d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
31867d4b7955SScott Wood		Size of image to load
318795579793STom Rini
318895579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
31897d4b7955SScott Wood		Entry point in loaded image to jump to
319095579793STom Rini
319195579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
319295579793STom Rini		Define this if you need to first read the OOB and then the
319395579793STom Rini		data. This is used for example on davinci plattforms.
319495579793STom Rini
319595579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
319695579793STom Rini		Support for an OMAP3-specific set of functions to return the
319795579793STom Rini		ID and MFR of the first attached NAND chip, if present.
319895579793STom Rini
31996a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
32006a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
32016a11cf48SDaniel Schwierzeck
32026a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
32036a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
32046a11cf48SDaniel Schwierzeck
32056a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
32066a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
32076a11cf48SDaniel Schwierzeck
3208c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
3209c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
3210c57b953dSPavel Machek
32116a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
32126a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
32131372cce2SMarian Balakowicz
3214ba1bee43SYing Zhang		CONFIG_SPL_ENV_SUPPORT
3215ba1bee43SYing Zhang		Support for the environment operating in SPL binary
3216ba1bee43SYing Zhang
3217ba1bee43SYing Zhang		CONFIG_SPL_NET_SUPPORT
3218ba1bee43SYing Zhang		Support for the net/libnet.o in SPL binary.
3219ba1bee43SYing Zhang		It conflicts with SPL env from storage medium specified by
3220ba1bee43SYing Zhang		CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3221ba1bee43SYing Zhang
322274752baaSScott Wood		CONFIG_SPL_PAD_TO
32236113d3f2SBenoît Thébaudeau		Image offset to which the SPL should be padded before appending
32246113d3f2SBenoît Thébaudeau		the SPL payload. By default, this is defined as
32256113d3f2SBenoît Thébaudeau		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
32266113d3f2SBenoît Thébaudeau		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
32276113d3f2SBenoît Thébaudeau		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
322874752baaSScott Wood
3229ca2fca22SScott Wood		CONFIG_SPL_TARGET
3230ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
3231ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
3232ca2fca22SScott Wood		example if more than one image needs to be produced.
3233ca2fca22SScott Wood
323487ebee39SSimon Glass		CONFIG_FIT_SPL_PRINT
323587ebee39SSimon Glass		Printing information about a FIT image adds quite a bit of
323687ebee39SSimon Glass		code to SPL. So this is normally disabled in SPL. Use this
323787ebee39SSimon Glass		option to re-enable it. This will affect the output of the
323887ebee39SSimon Glass		bootm command when booting a FIT image.
323987ebee39SSimon Glass
32403aa29de0SYing Zhang- TPL framework
32413aa29de0SYing Zhang		CONFIG_TPL
32423aa29de0SYing Zhang		Enable building of TPL globally.
32433aa29de0SYing Zhang
32443aa29de0SYing Zhang		CONFIG_TPL_PAD_TO
32453aa29de0SYing Zhang		Image offset to which the TPL should be padded before appending
32463aa29de0SYing Zhang		the TPL payload. By default, this is defined as
32473aa29de0SYing Zhang		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
32483aa29de0SYing Zhang		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
32493aa29de0SYing Zhang		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
32503aa29de0SYing Zhang
3251c609719bSwdenkModem Support:
3252c609719bSwdenk--------------
3253c609719bSwdenk
3254566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
3255c609719bSwdenk
325611ccc33fSMarcel Ziswiler- Modem support enable:
3257c609719bSwdenk		CONFIG_MODEM_SUPPORT
3258c609719bSwdenk
3259c609719bSwdenk- RTS/CTS Flow control enable:
3260c609719bSwdenk		CONFIG_HWFLOW
3261c609719bSwdenk
3262c609719bSwdenk- Modem debug support:
3263c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
3264c609719bSwdenk
3265c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
3266c609719bSwdenk		for modem support. Useful only with BDI2000.
3267c609719bSwdenk
3268a8c7c708Swdenk- Interrupt support (PPC):
3269a8c7c708Swdenk
3270a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
3271a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
327211ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
3273a8c7c708Swdenk		should set decrementer_count to appropriate value. If
327411ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
3275a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
327611ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
3277a8c7c708Swdenk		specific handling. If board has watchdog / status_led
3278a8c7c708Swdenk		/ other_activity_monitor it works automatically from
3279a8c7c708Swdenk		general timer_interrupt().
3280a8c7c708Swdenk
3281c609719bSwdenk- General:
3282c609719bSwdenk
3283c609719bSwdenk		In the target system modem support is enabled when a
3284c609719bSwdenk		specific key (key combination) is pressed during
3285c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
328611ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
3287c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
3288c609719bSwdenk		function, returning 1 and thus enabling modem
3289c609719bSwdenk		initialization.
3290c609719bSwdenk
3291c609719bSwdenk		If there are no modem init strings in the
3292c609719bSwdenk		environment, U-Boot proceed to autoboot; the
3293c609719bSwdenk		previous output (banner, info printfs) will be
329411ccc33fSMarcel Ziswiler		suppressed, though.
3295c609719bSwdenk
3296c609719bSwdenk		See also: doc/README.Modem
3297c609719bSwdenk
32989660e442SHelmut RaigerBoard initialization settings:
32999660e442SHelmut Raiger------------------------------
33009660e442SHelmut Raiger
33019660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
33029660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
33039660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
33049660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
33059660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
33069660e442SHelmut Raigertypically in board_init_f() and board_init_r().
33079660e442SHelmut Raiger
33089660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
33099660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
33109660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
33119660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3312c609719bSwdenk
3313c609719bSwdenkConfiguration Settings:
3314c609719bSwdenk-----------------------
3315c609719bSwdenk
33166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3317c609719bSwdenk		undefine this when you're short of memory.
3318c609719bSwdenk
33192fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
33202fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
33212fb2604dSPeter Tyser
33226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
3323c609719bSwdenk		prompt for user input.
3324c609719bSwdenk
33256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
3326c609719bSwdenk
33276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
3328c609719bSwdenk
33296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
3330c609719bSwdenk
33316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3332c609719bSwdenk		the application (usually a Linux kernel) when it is
3333c609719bSwdenk		booted
3334c609719bSwdenk
33356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
3336c609719bSwdenk		List of legal baudrate settings for this board.
3337c609719bSwdenk
33386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
3339c609719bSwdenk		Suppress display of console information at boot.
3340c609719bSwdenk
33416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
3342c609719bSwdenk		If the board specific function
3343c609719bSwdenk			extern int overwrite_console (void);
3344c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
3345c609719bSwdenk		serial port, else the settings in the environment are used.
3346c609719bSwdenk
33476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3348c609719bSwdenk		Enable the call to overwrite_console().
3349c609719bSwdenk
33506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3351c609719bSwdenk		Enable overwrite of previous console environment settings.
3352c609719bSwdenk
33536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3354c609719bSwdenk		Begin and End addresses of the area used by the
3355c609719bSwdenk		simple memory test.
3356c609719bSwdenk
33576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
3358c609719bSwdenk		Enable an alternate, more extensive memory test.
3359c609719bSwdenk
33606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
33615f535fe1Swdenk		Scratch address used by the alternate memory test
33625f535fe1Swdenk		You only need to set this if address zero isn't writeable
33635f535fe1Swdenk
33646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
33656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
336614f73ca6SStefan Roese		this specified memory area will get subtracted from the top
336711ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
336814f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
336914f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
337014f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
33715e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
337214f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
33735e12e75dSStefan Roese		will have to get fixed in Linux additionally.
337414f73ca6SStefan Roese
337514f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
337614f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
337714f73ca6SStefan Roese		be touched.
337814f73ca6SStefan Roese
337914f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
338014f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
338114f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
338214f73ca6SStefan Roese		non page size aligned address and this could cause major
338314f73ca6SStefan Roese		problems.
338414f73ca6SStefan Roese
33856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
3386c609719bSwdenk		Enable temporary baudrate change while serial download
3387c609719bSwdenk
33886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
3389c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
3390c609719bSwdenk
33916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
3392c609719bSwdenk		Physical start address of Motherboard I/O (if using a
3393c609719bSwdenk		Cogent motherboard)
3394c609719bSwdenk
33956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
3396c609719bSwdenk		Physical start address of Flash memory.
3397c609719bSwdenk
33986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
3399c609719bSwdenk		Physical start address of boot monitor code (set by
3400c609719bSwdenk		make config files to be same as the text base address
340114d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
34026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
3403c609719bSwdenk
34046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
34053b57fe0aSwdenk		Size of memory reserved for monitor code, used to
34063b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
34073b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
34083b57fe0aSwdenk		flash sector.
3409c609719bSwdenk
34106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
3411c609719bSwdenk		Size of DRAM reserved for malloc() use.
3412c609719bSwdenk
34136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
341415940c9aSStefan Roese		Normally compressed uImages are limited to an
341515940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
34166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
341715940c9aSStefan Roese		to adjust this setting to your needs.
3418c609719bSwdenk
34196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
3420c609719bSwdenk		Maximum size of memory mapped by the startup code of
3421c609719bSwdenk		the Linux kernel; all data that must be processed by
34227d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
34237d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
34241bce2aebSRobert P. J. Day		environment variable is defined and non-zero. In such case
34257d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
3426c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
3427c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
3428c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
3429c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
3430c609719bSwdenk
3431fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3432fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
3433fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
3434fca43cc8SJohn Rigby		is enabled.
3435fca43cc8SJohn Rigby
3436fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3437fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3438fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3439fca43cc8SJohn Rigby
3440fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3441fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3442fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3443fca43cc8SJohn Rigby
34446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3445c609719bSwdenk		Max number of Flash memory banks
3446c609719bSwdenk
34476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3448c609719bSwdenk		Max number of sectors on a Flash chip
3449c609719bSwdenk
34506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3451c609719bSwdenk		Timeout for Flash erase operations (in ms)
3452c609719bSwdenk
34536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3454c609719bSwdenk		Timeout for Flash write operations (in ms)
3455c609719bSwdenk
34566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
34578564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
34588564acf9Swdenk
34596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
34608564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
34618564acf9Swdenk
34626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
34638564acf9Swdenk		If defined, hardware flash sectors protection is used
34648564acf9Swdenk		instead of U-Boot software protection.
34658564acf9Swdenk
34666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3467c609719bSwdenk
3468c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3469c609719bSwdenk		without this option such a download has to be
3470c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3471c609719bSwdenk		copy from RAM to flash.
3472c609719bSwdenk
3473c609719bSwdenk		The two-step approach is usually more reliable, since
3474c609719bSwdenk		you can check if the download worked before you erase
347511ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
347611ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3477c609719bSwdenk		downloaded image) this option may be very useful.
3478c609719bSwdenk
34796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3480c609719bSwdenk		Define if the flash driver uses extra elements in the
34815653fc33Swdenk		common flash structure for storing flash geometry.
34825653fc33Swdenk
348300b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
34845653fc33Swdenk		This option also enables the building of the cfi_flash driver
34855653fc33Swdenk		in the drivers directory
348653cf9435Sstroese
348791809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
348891809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
348991809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
349091809ed5SPiotr Ziecik		to the MTD layer.
349191809ed5SPiotr Ziecik
34926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
349396ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
349496ef831fSGuennadi Liakhovetski
349596ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
349696ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
349796ef831fSGuennadi Liakhovetski		write commands.
349896ef831fSGuennadi Liakhovetski
34996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
35005568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
35015568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
35025568e613SStefan Roese		is useful, if some of the configured banks are only
35035568e613SStefan Roese		optionally available.
35045568e613SStefan Roese
35059a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
35069a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
35079a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
35089a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
35099a042e9cSJerry Van Baren
3510352ef3f1SStefan Roese- CONFIG_FLASH_VERIFY
3511352ef3f1SStefan Roese		If defined, the content of the flash (destination) is compared
3512352ef3f1SStefan Roese		against the source after the write operation. An error message
3513352ef3f1SStefan Roese		will be printed when the contents are not identical.
3514352ef3f1SStefan Roese		Please note that this option is useless in nearly all cases,
3515352ef3f1SStefan Roese		since such flash programming errors usually are detected earlier
3516352ef3f1SStefan Roese		while unprotecting/erasing/programming. Please only enable
3517352ef3f1SStefan Roese		this option if you really know what you are doing.
3518352ef3f1SStefan Roese
35196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
352011ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
352111ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
352253cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
352353cf9435Sstroese		buffers can be full shortly after enabling the interface
352411ccc33fSMarcel Ziswiler		on high Ethernet traffic.
352553cf9435Sstroese		Defaults to 4 if not defined.
3526c609719bSwdenk
3527ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3528ea882bafSWolfgang Denk
3529ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3530ea882bafSWolfgang Denk	internally to store the environment settings. The default
3531ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3532ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3533ea882bafSWolfgang Denk	lib/hashtable.c for details.
3534ea882bafSWolfgang Denk
35352598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_DEFAULT
35362598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_STATIC
35371bce2aebSRobert P. J. Day	Enable validation of the values given to environment variables when
35382598090bSJoe Hershberger	calling env set.  Variables can be restricted to only decimal,
35392598090bSJoe Hershberger	hexadecimal, or boolean.  If CONFIG_CMD_NET is also defined,
35402598090bSJoe Hershberger	the variables can also be restricted to IP address or MAC address.
35412598090bSJoe Hershberger
35422598090bSJoe Hershberger	The format of the list is:
35432598090bSJoe Hershberger		type_attribute = [s|d|x|b|i|m]
3544267541f7SJoe Hershberger		access_atribute = [a|r|o|c]
3545267541f7SJoe Hershberger		attributes = type_attribute[access_atribute]
35462598090bSJoe Hershberger		entry = variable_name[:attributes]
35472598090bSJoe Hershberger		list = entry[,list]
35482598090bSJoe Hershberger
35492598090bSJoe Hershberger	The type attributes are:
35502598090bSJoe Hershberger		s - String (default)
35512598090bSJoe Hershberger		d - Decimal
35522598090bSJoe Hershberger		x - Hexadecimal
35532598090bSJoe Hershberger		b - Boolean ([1yYtT|0nNfF])
35542598090bSJoe Hershberger		i - IP address
35552598090bSJoe Hershberger		m - MAC address
35562598090bSJoe Hershberger
3557267541f7SJoe Hershberger	The access attributes are:
3558267541f7SJoe Hershberger		a - Any (default)
3559267541f7SJoe Hershberger		r - Read-only
3560267541f7SJoe Hershberger		o - Write-once
3561267541f7SJoe Hershberger		c - Change-default
3562267541f7SJoe Hershberger
35632598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_DEFAULT
35642598090bSJoe Hershberger		Define this to a list (string) to define the ".flags"
35652598090bSJoe Hershberger		envirnoment variable in the default or embedded environment.
35662598090bSJoe Hershberger
35672598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_STATIC
35682598090bSJoe Hershberger		Define this to a list (string) to define validation that
35692598090bSJoe Hershberger		should be done if an entry is not found in the ".flags"
35702598090bSJoe Hershberger		environment variable.  To override a setting in the static
35712598090bSJoe Hershberger		list, simply add an entry for the same variable name to the
35722598090bSJoe Hershberger		".flags" variable.
35732598090bSJoe Hershberger
3574267541f7SJoe Hershberger- CONFIG_ENV_ACCESS_IGNORE_FORCE
3575267541f7SJoe Hershberger	If defined, don't allow the -f switch to env set override variable
3576267541f7SJoe Hershberger	access flags.
3577267541f7SJoe Hershberger
35785c1a7ea6SSimon Glass- CONFIG_SYS_GENERIC_BOARD
35795c1a7ea6SSimon Glass	This selects the architecture-generic board system instead of the
35805c1a7ea6SSimon Glass	architecture-specific board files. It is intended to move boards
35815c1a7ea6SSimon Glass	to this new framework over time. Defining this will disable the
35825c1a7ea6SSimon Glass	arch/foo/lib/board.c file and use common/board_f.c and
35835c1a7ea6SSimon Glass	common/board_r.c instead. To use this option your architecture
35845c1a7ea6SSimon Glass	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
35855c1a7ea6SSimon Glass	its config.mk file). If you find problems enabling this option on
35865c1a7ea6SSimon Glass	your board please report the problem and send patches!
35875c1a7ea6SSimon Glass
3588632efa74SSimon Glass- CONFIG_SYS_SYM_OFFSETS
3589632efa74SSimon Glass	This is set by architectures that use offsets for link symbols
3590632efa74SSimon Glass	instead of absolute values. So bss_start is obtained using an
3591632efa74SSimon Glass	offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
3592632efa74SSimon Glass	directly. You should not need to touch this setting.
3593632efa74SSimon Glass
35940b1b60c7SLokesh Vutla- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
35950b1b60c7SLokesh Vutla	This is set by OMAP boards for the max time that reset should
35960b1b60c7SLokesh Vutla	be asserted. See doc/README.omap-reset-time for details on how
35970b1b60c7SLokesh Vutla	the value can be calulated on a given board.
3598632efa74SSimon Glass
3599c609719bSwdenkThe following definitions that deal with the placement and management
3600c609719bSwdenkof environment data (variable area); in general, we support the
3601c609719bSwdenkfollowing configurations:
3602c609719bSwdenk
3603c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3604c3eb3fe4SMike Frysinger
3605c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3606c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3607c3eb3fe4SMike Frysinger
36085a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3609c609719bSwdenk
3610c609719bSwdenk	Define this if the environment is in flash memory.
3611c609719bSwdenk
3612c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3613c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3614c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3615c609719bSwdenk	   sector" type flash chips, which have several smaller
3616c609719bSwdenk	   sectors at the start or the end. For instance, such a
3617c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3618c609719bSwdenk	   such a case you would place the environment in one of the
3619c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3620c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3621c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3622c609719bSwdenk	   between U-Boot and the environment.
3623c609719bSwdenk
36240e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3625c609719bSwdenk
3626c609719bSwdenk	   Offset of environment data (variable area) to the
3627c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3628c609719bSwdenk	   type flash chips the second sector can be used: the offset
3629c609719bSwdenk	   for this sector is given here.
3630c609719bSwdenk
36316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3632c609719bSwdenk
36330e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3634c609719bSwdenk
3635c609719bSwdenk	   This is just another way to specify the start address of
3636c609719bSwdenk	   the flash sector containing the environment (instead of
36370e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3638c609719bSwdenk
36390e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3640c609719bSwdenk
3641c609719bSwdenk	   Size of the sector containing the environment.
3642c609719bSwdenk
3643c609719bSwdenk
3644c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3645c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3646c609719bSwdenk	   the environment.
3647c609719bSwdenk
36480e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3649c609719bSwdenk
36505a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
36510e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3652c609719bSwdenk	   of this flash sector for the environment. This saves
3653c609719bSwdenk	   memory for the RAM copy of the environment.
3654c609719bSwdenk
3655c609719bSwdenk	   It may also save flash memory if you decide to use this
3656c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3657c609719bSwdenk	   since then the remainder of the flash sector could be used
3658c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3659c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3660c609719bSwdenk	   updating the environment in flash makes it always
3661c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3662c609719bSwdenk	   wrong before the contents has been restored from a copy in
3663c609719bSwdenk	   RAM, your target system will be dead.
3664c609719bSwdenk
36650e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
36660e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3667c609719bSwdenk
3668c609719bSwdenk	   These settings describe a second storage area used to hold
366911ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
36703e38691eSwdenk	   a valid backup copy in case there is a power failure during
3671c609719bSwdenk	   a "saveenv" operation.
3672c609719bSwdenk
3673c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3674c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3675c609719bSwdenkaccordingly!
3676c609719bSwdenk
3677c609719bSwdenk
36789314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3679c609719bSwdenk
3680c609719bSwdenk	Define this if you have some non-volatile memory device
3681c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3682c609719bSwdenk	environment.
3683c609719bSwdenk
36840e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
36850e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3686c609719bSwdenk
368711ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3688c609719bSwdenk	  want to use for environment. It is assumed that this memory
3689c609719bSwdenk	  can just be read and written to, without any special
3690c609719bSwdenk	  provision.
3691c609719bSwdenk
3692c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3693c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
369411ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3695c609719bSwdenkU-Boot will hang.
3696c609719bSwdenk
3697c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3698c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3699c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3700c609719bSwdenkto save the current settings.
3701c609719bSwdenk
3702c609719bSwdenk
3703bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3704c609719bSwdenk
3705c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3706c609719bSwdenk	device and a driver for it.
3707c609719bSwdenk
37080e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
37090e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3710c609719bSwdenk
3711c609719bSwdenk	  These two #defines specify the offset and size of the
3712c609719bSwdenk	  environment area within the total memory of your EEPROM.
3713c609719bSwdenk
37146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3715c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3716c609719bSwdenk	  The default address is zero.
3717c609719bSwdenk
37186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3719c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3720c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3721c609719bSwdenk	  would require six bits.
3722c609719bSwdenk
37236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3724c609719bSwdenk	  If defined, the number of milliseconds to delay between
3725c609719bSwdenk	  page writes.	The default is zero milliseconds.
3726c609719bSwdenk
37276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3728c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3729c609719bSwdenk	  that this is NOT the chip address length!
3730c609719bSwdenk
37316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
37325cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
37335cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
37345cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
37355cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
37365cf91d6bSwdenk	  byte chips.
37375cf91d6bSwdenk
37385cf91d6bSwdenk	  Note that we consider the length of the address field to
37395cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
37405cf91d6bSwdenk	  in the chip address.
37415cf91d6bSwdenk
37426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3743c609719bSwdenk	  The size in bytes of the EEPROM device.
3744c609719bSwdenk
3745548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3746548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3747548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3748548738b4SHeiko Schocher
3749548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3750548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3751548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3752548738b4SHeiko Schocher	  EEPROM. For example:
3753548738b4SHeiko Schocher
3754ea818dbbSHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  1
3755548738b4SHeiko Schocher
3756548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3757548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3758c609719bSwdenk
3759057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
37605779d8d9Swdenk
37615779d8d9Swdenk	Define this if you have a DataFlash memory device which you
37625779d8d9Swdenk	want to use for the environment.
37635779d8d9Swdenk
37640e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
37650e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
37660e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
37675779d8d9Swdenk
37685779d8d9Swdenk	  These three #defines specify the offset and size of the
37695779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
37705779d8d9Swdenk	  at the specified address.
37715779d8d9Swdenk
37720a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
37730a85a9e7SLiu Gang
37740a85a9e7SLiu Gang	Define this if you have a remote memory space which you
37750a85a9e7SLiu Gang	want to use for the local device's environment.
37760a85a9e7SLiu Gang
37770a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
37780a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
37790a85a9e7SLiu Gang
37800a85a9e7SLiu Gang	  These two #defines specify the address and size of the
37810a85a9e7SLiu Gang	  environment area within the remote memory space. The
37820a85a9e7SLiu Gang	  local device can get the environment from remote memory
3783fc54c7faSLiu Gang	  space by SRIO or PCIE links.
37840a85a9e7SLiu Gang
37850a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
37860a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3787fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3788fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
37890a85a9e7SLiu Gang
379051bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
379113a5695bSwdenk
379213a5695bSwdenk	Define this if you have a NAND device which you want to use
379313a5695bSwdenk	for the environment.
379413a5695bSwdenk
37950e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
37960e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
379713a5695bSwdenk
379813a5695bSwdenk	  These two #defines specify the offset and size of the environment
3799fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3800fdd813deSScott Wood	  aligned to an erase block boundary.
38015779d8d9Swdenk
3802fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3803e443c944SMarkus Klotzbuecher
38040e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3805fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3806fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3807fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3808fdd813deSScott Wood	  aligned to an erase block boundary.
3809e443c944SMarkus Klotzbuecher
3810fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3811fdd813deSScott Wood
3812fdd813deSScott Wood	  Specifies the length of the region in which the environment
3813fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3814fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3815fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3816fdd813deSScott Wood	  the range to be avoided.
3817fdd813deSScott Wood
3818fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3819fdd813deSScott Wood
3820fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3821fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3822fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3823fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3824fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3825e443c944SMarkus Klotzbuecher
3826b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3827b74ab737SGuennadi Liakhovetski
3828b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3829b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3830b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3831b74ab737SGuennadi Liakhovetski
38322b74433fSJoe Hershberger- CONFIG_ENV_IS_IN_UBI:
38332b74433fSJoe Hershberger
38342b74433fSJoe Hershberger	Define this if you have an UBI volume that you want to use for the
38352b74433fSJoe Hershberger	environment.  This has the benefit of wear-leveling the environment
38362b74433fSJoe Hershberger	accesses, which is important on NAND.
38372b74433fSJoe Hershberger
38382b74433fSJoe Hershberger	- CONFIG_ENV_UBI_PART:
38392b74433fSJoe Hershberger
38402b74433fSJoe Hershberger	  Define this to a string that is the mtd partition containing the UBI.
38412b74433fSJoe Hershberger
38422b74433fSJoe Hershberger	- CONFIG_ENV_UBI_VOLUME:
38432b74433fSJoe Hershberger
38442b74433fSJoe Hershberger	  Define this to the name of the volume that you want to store the
38452b74433fSJoe Hershberger	  environment in.
38462b74433fSJoe Hershberger
3847785881f7SJoe Hershberger	- CONFIG_ENV_UBI_VOLUME_REDUND:
3848785881f7SJoe Hershberger
3849785881f7SJoe Hershberger	  Define this to the name of another volume to store a second copy of
3850785881f7SJoe Hershberger	  the environment in.  This will enable redundant environments in UBI.
3851785881f7SJoe Hershberger	  It is assumed that both volumes are in the same MTD partition.
3852785881f7SJoe Hershberger
38532b74433fSJoe Hershberger	- CONFIG_UBI_SILENCE_MSG
38542b74433fSJoe Hershberger	- CONFIG_UBIFS_SILENCE_MSG
38552b74433fSJoe Hershberger
38562b74433fSJoe Hershberger	  You will probably want to define these to avoid a really noisy system
38572b74433fSJoe Hershberger	  when storing the env in UBI.
38582b74433fSJoe Hershberger
385906e4ae5fSStephen Warren- CONFIG_ENV_IS_IN_MMC:
386006e4ae5fSStephen Warren
386106e4ae5fSStephen Warren	Define this if you have an MMC device which you want to use for the
386206e4ae5fSStephen Warren	environment.
386306e4ae5fSStephen Warren
386406e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_DEV:
386506e4ae5fSStephen Warren
386606e4ae5fSStephen Warren	  Specifies which MMC device the environment is stored in.
386706e4ae5fSStephen Warren
386806e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_PART (optional):
386906e4ae5fSStephen Warren
387006e4ae5fSStephen Warren	  Specifies which MMC partition the environment is stored in. If not
387106e4ae5fSStephen Warren	  set, defaults to partition 0, the user area. Common values might be
387206e4ae5fSStephen Warren	  1 (first MMC boot partition), 2 (second MMC boot partition).
387306e4ae5fSStephen Warren
387406e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET:
387506e4ae5fSStephen Warren	- CONFIG_ENV_SIZE:
387606e4ae5fSStephen Warren
387706e4ae5fSStephen Warren	  These two #defines specify the offset and size of the environment
387806e4ae5fSStephen Warren	  area within the specified MMC device.
387906e4ae5fSStephen Warren
38805c088ee8SStephen Warren	  If offset is positive (the usual case), it is treated as relative to
38815c088ee8SStephen Warren	  the start of the MMC partition. If offset is negative, it is treated
38825c088ee8SStephen Warren	  as relative to the end of the MMC partition. This can be useful if
38835c088ee8SStephen Warren	  your board may be fitted with different MMC devices, which have
38845c088ee8SStephen Warren	  different sizes for the MMC partitions, and you always want the
38855c088ee8SStephen Warren	  environment placed at the very end of the partition, to leave the
38865c088ee8SStephen Warren	  maximum possible space before it, to store other data.
38875c088ee8SStephen Warren
388806e4ae5fSStephen Warren	  These two values are in units of bytes, but must be aligned to an
388906e4ae5fSStephen Warren	  MMC sector boundary.
389006e4ae5fSStephen Warren
389106e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET_REDUND (optional):
389206e4ae5fSStephen Warren
389306e4ae5fSStephen Warren	  Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
389406e4ae5fSStephen Warren	  hold a redundant copy of the environment data. This provides a
389506e4ae5fSStephen Warren	  valid backup copy in case the other copy is corrupted, e.g. due
389606e4ae5fSStephen Warren	  to a power failure during a "saveenv" operation.
389706e4ae5fSStephen Warren
38985c088ee8SStephen Warren	  This value may also be positive or negative; this is handled in the
38995c088ee8SStephen Warren	  same way as CONFIG_ENV_OFFSET.
39005c088ee8SStephen Warren
390106e4ae5fSStephen Warren	  This value is also in units of bytes, but must also be aligned to
390206e4ae5fSStephen Warren	  an MMC sector boundary.
390306e4ae5fSStephen Warren
390406e4ae5fSStephen Warren	- CONFIG_ENV_SIZE_REDUND (optional):
390506e4ae5fSStephen Warren
390606e4ae5fSStephen Warren	  This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
390706e4ae5fSStephen Warren	  set. If this value is set, it must be set to the same value as
390806e4ae5fSStephen Warren	  CONFIG_ENV_SIZE.
390906e4ae5fSStephen Warren
39106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3911c609719bSwdenk
3912c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3913c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3914c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3915c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3916c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3917c609719bSwdenk	to be a good choice since it makes it far enough from the
3918c609719bSwdenk	start of the data area as well as from the stack pointer.
3919c609719bSwdenk
3920e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3921c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3922cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3923c609719bSwdenkuntil then to read environment variables.
3924c609719bSwdenk
392585ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
392685ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
392785ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
392885ec0bccSwdenknecessary, because the first environment variable we need is the
392985ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
393085ec0bccSwdenkhave any device yet where we could complain.]
3931c609719bSwdenk
3932c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3933c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
393485ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3935c609719bSwdenk
39366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3937fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3938fc3e2165Swdenk
39396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3940fc3e2165Swdenk		      also needs to be defined.
3941fc3e2165Swdenk
39426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3943fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3944c609719bSwdenk
3945f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3946f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3947f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3948f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3949f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3950f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3951f5675aa5SRon Madrid
3952b2b92f53SSimon Glass- CONFIG_DISPLAY_BOARDINFO
3953b2b92f53SSimon Glass		Display information about the board that U-Boot is running on
3954b2b92f53SSimon Glass		when U-Boot starts up. The board function checkboard() is called
3955b2b92f53SSimon Glass		to do this.
3956b2b92f53SSimon Glass
3957e2e3e2b1SSimon Glass- CONFIG_DISPLAY_BOARDINFO_LATE
3958e2e3e2b1SSimon Glass		Similar to the previous option, but display this information
3959e2e3e2b1SSimon Glass		later, once stdio is running and output goes to the LCD, if
3960e2e3e2b1SSimon Glass		present.
3961e2e3e2b1SSimon Glass
3962c609719bSwdenkLow Level (hardware related) configuration options:
3963dc7c9a1aSwdenk---------------------------------------------------
3964c609719bSwdenk
39656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3966c609719bSwdenk		Cache Line Size of the CPU.
3967c609719bSwdenk
39686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3969c609719bSwdenk		Default address of the IMMR after system reset.
39702535d602Swdenk
39712535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
39722535d602Swdenk		and RPXsuper) to be able to adjust the position of
39732535d602Swdenk		the IMMR register after a reset.
3974c609719bSwdenk
3975e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3976e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3977e46fedfeSTimur Tabi		PowerPC SOCs.
3978e46fedfeSTimur Tabi
3979e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3980e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3981e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3982e46fedfeSTimur Tabi
3983e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3984e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3985e46fedfeSTimur Tabi
3986e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3987e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3988e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3989e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3990e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3991e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3992e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3993e46fedfeSTimur Tabi
3994e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3995e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3996e46fedfeSTimur Tabi
3997e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3998e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3999e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
4000e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
4001e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
4002e46fedfeSTimur Tabi
4003e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
4004e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
4005e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
4006e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
4007e46fedfeSTimur Tabi
4008e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
4009e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
4010e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
4011e46fedfeSTimur Tabi
40127f6c2cbcSwdenk- Floppy Disk Support:
40136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
40147f6c2cbcSwdenk
40157f6c2cbcSwdenk		the default drive number (default value 0)
40167f6c2cbcSwdenk
40176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
40187f6c2cbcSwdenk
401911ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
40207f6c2cbcSwdenk		(default value 1)
40217f6c2cbcSwdenk
40226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
40237f6c2cbcSwdenk
40247f6c2cbcSwdenk		defines the offset of register from address. It
40257f6c2cbcSwdenk		depends on which part of the data bus is connected to
402611ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
40277f6c2cbcSwdenk
40286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
40296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
40307f6c2cbcSwdenk		default value.
40317f6c2cbcSwdenk
40326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
40337f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
40347f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
40357f6c2cbcSwdenk		source code. It is used to make hardware dependant
40367f6c2cbcSwdenk		initializations.
40377f6c2cbcSwdenk
40380abddf82SMacpaul Lin- CONFIG_IDE_AHB:
40390abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
40400abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
40410abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
40420abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
40430abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
40440abddf82SMacpaul Lin		is requierd.
40450abddf82SMacpaul Lin
40466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
404725d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
404825d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
4049c609719bSwdenk
40506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
4051c609719bSwdenk
40527152b1d0Swdenk		Start address of memory area that can be used for
4053c609719bSwdenk		initial data and stack; please note that this must be
4054c609719bSwdenk		writable memory that is working WITHOUT special
4055c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
4056c609719bSwdenk		will become available only after programming the
4057c609719bSwdenk		memory controller and running certain initialization
4058c609719bSwdenk		sequences.
4059c609719bSwdenk
4060c609719bSwdenk		U-Boot uses the following memory types:
4061c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
4062c609719bSwdenk		- MPC824X: data cache
4063c609719bSwdenk		- PPC4xx:  data cache
4064c609719bSwdenk
40656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
4066c609719bSwdenk
4067c609719bSwdenk		Offset of the initial data structure in the memory
40686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
40696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
4070c609719bSwdenk		data is located at the end of the available space
4071553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
40726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
40736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
40746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
4075c609719bSwdenk
4076c609719bSwdenk	Note:
4077c609719bSwdenk		On the MPC824X (or other systems that use the data
4078c609719bSwdenk		cache for initial memory) the address chosen for
40796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
4080c609719bSwdenk		point to an otherwise UNUSED address space between
4081c609719bSwdenk		the top of RAM and the start of the PCI space.
4082c609719bSwdenk
40836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
4084c609719bSwdenk
40856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
4086c609719bSwdenk
40876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
4088c609719bSwdenk
40896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
4090c609719bSwdenk
40916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
4092c609719bSwdenk
40936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
4094c609719bSwdenk
40956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
4096c609719bSwdenk		SDRAM timing
4097c609719bSwdenk
40986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
4099c609719bSwdenk		periodic timer for refresh
4100c609719bSwdenk
41016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
4102c609719bSwdenk
41036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
41046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
41056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
41066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
4107c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
4108c609719bSwdenk
4109c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
41106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
41116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
4112c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
4113c609719bSwdenk
41146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
41156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
4116c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
4117c609719bSwdenk		Prescaler definitions (SDRAM timing)
4118c609719bSwdenk
41196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
4120c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
4121c609719bSwdenk		define relocation offset in DPRAM [DSP2]
4122c609719bSwdenk
41236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
4124b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
4125b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
4126b423d055SHeiko Schocher
41276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
4128c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
4129c609719bSwdenk		define relocation offset in DPRAM [SCC4]
4130c609719bSwdenk
41316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
4132c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
4133c609719bSwdenk		wrong setting might damage your board. Read
4134c609719bSwdenk		doc/README.MBX before setting this variable!
4135c609719bSwdenk
41366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
4137ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
4138ea909b76Swdenk		(Power On Self Tests). This definition overrides
4139ea909b76Swdenk		#define'd default value in commproc.h resp.
4140ea909b76Swdenk		cpm_8260.h.
4141ea909b76Swdenk
41426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
41436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
41446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
41456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
41466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
41476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
41486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
41496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
4150a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
41515d232d0eSwdenk
41529cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
41539cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
41549cacf4fcSDirk Eibach		required.
41559cacf4fcSDirk Eibach
415669fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
415769fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
415869fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
415969fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
416069fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
416169fd2d3bSAndrew Sharp		by coreboot or similar.
416269fd2d3bSAndrew Sharp
4163842033e6SGabor Juhos- CONFIG_PCI_INDIRECT_BRIDGE:
4164842033e6SGabor Juhos		Enable support for indirect PCI bridges.
4165842033e6SGabor Juhos
4166a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
4167a09b9b68SKumar Gala		Chip has SRIO or not
4168a09b9b68SKumar Gala
4169a09b9b68SKumar Gala- CONFIG_SRIO1:
4170a09b9b68SKumar Gala		Board has SRIO 1 port available
4171a09b9b68SKumar Gala
4172a09b9b68SKumar Gala- CONFIG_SRIO2:
4173a09b9b68SKumar Gala		Board has SRIO 2 port available
4174a09b9b68SKumar Gala
4175c8b28152SLiu Gang- CONFIG_SRIO_PCIE_BOOT_MASTER
4176c8b28152SLiu Gang		Board can support master function for Boot from SRIO and PCIE
4177c8b28152SLiu Gang
4178a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
4179a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
4180a09b9b68SKumar Gala
4181a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
4182a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
4183a09b9b68SKumar Gala
4184a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
4185a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
4186a09b9b68SKumar Gala
418766bd1846SFabio Estevam- CONFIG_SYS_NAND_BUSWIDTH_16BIT
418866bd1846SFabio Estevam		Defined to tell the NAND controller that the NAND chip is using
418966bd1846SFabio Estevam		a 16 bit bus.
419066bd1846SFabio Estevam		Not all NAND drivers use this symbol.
4191a430e916SFabio Estevam		Example of drivers that use it:
419266bd1846SFabio Estevam		- drivers/mtd/nand/ndfc.c
4193a430e916SFabio Estevam		- drivers/mtd/nand/mxc_nand.c
4194eced4626SAlex Waterman
4195eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
4196eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
4197eced4626SAlex Waterman		a default value will be used.
4198eced4626SAlex Waterman
4199bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
4200218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
4201218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
4202218ca724SWolfgang Denk
4203bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
4204bb99ad6dSBen Warren		I2C address of the SPD EEPROM
4205bb99ad6dSBen Warren
42066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
4207218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
4208218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
4209218ca724SWolfgang Denk		to something your driver can deal with.
4210bb99ad6dSBen Warren
42111b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
42121b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
42131b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
42141b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
42151b3e3c4fSYork Sun		header files or board specific files.
42161b3e3c4fSYork Sun
42176f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
42186f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
42196f5e1dc5SYork Sun
42206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
4221218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
4222218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
42232ad6b513STimur Tabi
4224c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
4225c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
4226c26e454dSwdenk
4227c26e454dSwdenk- CONFIG_FEC[12]_PHY
4228c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
42296e592385Swdenk		to the given FEC; i. e.
4230c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
4231c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
4232c26e454dSwdenk
4233c26e454dSwdenk		When set to -1, means to probe for first available.
4234c26e454dSwdenk
4235c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
4236c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
4237c26e454dSwdenk		(so program the FEC to ignore it).
4238c26e454dSwdenk
4239c26e454dSwdenk- CONFIG_RMII
4240c26e454dSwdenk		Enable RMII mode for all FECs.
4241c26e454dSwdenk		Note that this is a global option, we can't
4242c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
4243c26e454dSwdenk
42445cf91d6bSwdenk- CONFIG_CRC32_VERIFY
42455cf91d6bSwdenk		Add a verify option to the crc32 command.
42465cf91d6bSwdenk		The syntax is:
42475cf91d6bSwdenk
42485cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
42495cf91d6bSwdenk
42505cf91d6bSwdenk		Where address/count indicate a memory area
42515cf91d6bSwdenk		and crc32 is the correct crc32 which the
42525cf91d6bSwdenk		area should have.
42535cf91d6bSwdenk
425456523f12Swdenk- CONFIG_LOOPW
425556523f12Swdenk		Add the "loopw" memory command. This only takes effect if
4256602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
425756523f12Swdenk
42587b466641Sstroese- CONFIG_MX_CYCLIC
42597b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
42607b466641Sstroese		"md/mw" commands.
42617b466641Sstroese		Examples:
42627b466641Sstroese
42637b466641Sstroese		=> mdc.b 10 4 500
42647b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
42657b466641Sstroese
42667b466641Sstroese		=> mwc.l 100 12345678 10
42677b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
42687b466641Sstroese
42697b466641Sstroese		This only takes effect if the memory commands are activated
4270602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
42717b466641Sstroese
42728aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
4273afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
4274e03f3169SWolfgang Denk		low level initializations (like setting up the memory
4275e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
4276e03f3169SWolfgang Denk		relocate itself into RAM.
42778aa1a2d1Swdenk
4278e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
4279e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
4280e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
4281e03f3169SWolfgang Denk		these initializations itself.
42828aa1a2d1Swdenk
4283401bb30bSAneesh V- CONFIG_SPL_BUILD
4284df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
4285df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
4286df81238bSMagnus Lilja		compiling a NAND SPL.
4287400558b5Swdenk
42883aa29de0SYing Zhang- CONFIG_TPL_BUILD
42893aa29de0SYing Zhang		Modifies the behaviour of start.S  when compiling a loader
42903aa29de0SYing Zhang		that is executed after the SPL and before the actual U-Boot.
42913aa29de0SYing Zhang		It is loaded by the SPL.
42923aa29de0SYing Zhang
42935df572f0SYing Zhang- CONFIG_SYS_MPC85XX_NO_RESETVEC
42945df572f0SYing Zhang		Only for 85xx systems. If this variable is specified, the section
42955df572f0SYing Zhang		.resetvec is not kept and the section .bootpg is placed in the
42965df572f0SYing Zhang		previous 4k of the .text section.
42975df572f0SYing Zhang
42984213fc29SSimon Glass- CONFIG_ARCH_MAP_SYSMEM
42994213fc29SSimon Glass		Generally U-Boot (and in particular the md command) uses
43004213fc29SSimon Glass		effective address. It is therefore not necessary to regard
43014213fc29SSimon Glass		U-Boot address as virtual addresses that need to be translated
43024213fc29SSimon Glass		to physical addresses. However, sandbox requires this, since
43034213fc29SSimon Glass		it maintains its own little RAM buffer which contains all
43044213fc29SSimon Glass		addressable memory. This option causes some memory accesses
43054213fc29SSimon Glass		to be mapped through map_sysmem() / unmap_sysmem().
43064213fc29SSimon Glass
4307d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
4308d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
4309d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
4310d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
4311d8834a13SMatthias Weisser		conditions but may increase the binary size.
4312d8834a13SMatthias Weisser
4313588a13f7SSimon Glass- CONFIG_X86_RESET_VECTOR
4314588a13f7SSimon Glass		If defined, the x86 reset vector code is included. This is not
4315588a13f7SSimon Glass		needed when U-Boot is running from Coreboot.
4316b16f521aSGabe Black
4317fc33705eSMark Jackson- CONFIG_SYS_MPUCLK
4318fc33705eSMark Jackson		Defines the MPU clock speed (in MHz).
4319fc33705eSMark Jackson
4320fc33705eSMark Jackson		NOTE : currently only supported on AM335x platforms.
43215b5ece9eSGabe Black
4322f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
4323f2717b47STimur Tabi-----------------------------------
4324f2717b47STimur Tabi
4325f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4326f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
4327f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
4328f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
4329f2717b47STimur Tabiwithin that device.
4330f2717b47STimur Tabi
4331f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
4332f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
4333f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4334f2717b47STimur Tabi	is also specified.
4335f2717b47STimur Tabi
4336f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
4337f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
4338f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
4339f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
4340f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
4341f2717b47STimur Tabi
4342f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
4343f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4344f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
4345f2717b47STimur Tabi	virtual address in NOR flash.
4346f2717b47STimur Tabi
4347f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
4348f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
4349f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4350f2717b47STimur Tabi
4351f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
4352f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
4353f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4354f2717b47STimur Tabi
4355f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4356f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
4357f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4358f2717b47STimur Tabi
4359292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4360292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
4361292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4362fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4363fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
4364fc54c7faSLiu Gang	master's memory space.
4365f2717b47STimur Tabi
4366c609719bSwdenkBuilding the Software:
4367c609719bSwdenk======================
4368c609719bSwdenk
4369218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
4370218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
4371218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
4372218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
4373218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4374218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
4375c609719bSwdenk
4376218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
4377218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
4378218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
4379218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
4380218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
4381c609719bSwdenk
4382218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
4383218ca724SWolfgang Denk	$ export CROSS_COMPILE
4384c609719bSwdenk
43852f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
43862f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
43872f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
43882f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
43892f8d396bSPeter Tyser
43902f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
43912f8d396bSPeter Tyser
43922f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
43932f8d396bSPeter Tyser      be executed on computers running Windows.
43942f8d396bSPeter Tyser
4395c609719bSwdenkU-Boot is intended to be simple to build. After installing the
4396c609719bSwdenksources you must configure U-Boot for one specific board type. This
4397c609719bSwdenkis done by typing:
4398c609719bSwdenk
4399c609719bSwdenk	make NAME_config
4400c609719bSwdenk
4401218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
44024d675ae6SMichael Jonesrations; see boards.cfg for supported names.
440354387ac9Swdenk
4404c609719bSwdenkNote: for some board special configuration names may exist; check if
4405c609719bSwdenk      additional information is available from the board vendor; for
44062729af9dSwdenk      instance, the TQM823L systems are available without (standard)
44072729af9dSwdenk      or with LCD support. You can select such additional "features"
440811ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
4409c609719bSwdenk
44102729af9dSwdenk      make TQM823L_config
44112729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
4412c609719bSwdenk
4413c609719bSwdenk      make TQM823L_LCD_config
4414c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
4415c609719bSwdenk
4416c609719bSwdenk      etc.
4417c609719bSwdenk
4418c609719bSwdenk
4419c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
44207152b1d0Swdenkimages ready for download to / installation on your system:
4421c609719bSwdenk
4422c609719bSwdenk- "u-boot.bin" is a raw binary image
4423c609719bSwdenk- "u-boot" is an image in ELF binary format
4424c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
4425c609719bSwdenk
4426baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
4427baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
4428baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
4429baf31249SMarian Balakowicz
4430baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
4431baf31249SMarian Balakowicz
4432baf31249SMarian Balakowicz	make O=/tmp/build distclean
4433baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
4434baf31249SMarian Balakowicz	make O=/tmp/build all
4435baf31249SMarian Balakowicz
4436baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
4437baf31249SMarian Balakowicz
4438baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4439baf31249SMarian Balakowicz	make distclean
4440baf31249SMarian Balakowicz	make NAME_config
4441baf31249SMarian Balakowicz	make all
4442baf31249SMarian Balakowicz
4443baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
4444baf31249SMarian Balakowiczvariable.
4445baf31249SMarian Balakowicz
4446c609719bSwdenk
4447c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
4448c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
4449c609719bSwdenknative "make".
4450c609719bSwdenk
4451c609719bSwdenk
4452c609719bSwdenkIf the system board that you have is not listed, then you will need
4453c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
4454c609719bSwdenksteps:
4455c609719bSwdenk
4456c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
44574d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
44584d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
4459c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
446085ec0bccSwdenk    files you need. In your board directory, you will need at least
446185ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
446285ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
446385ec0bccSwdenk    your board
4464c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
4465c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
446685ec0bccSwdenk4.  Run "make <board>_config" with your new name.
4467c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
4468c609719bSwdenk    to be installed on your target system.
446985ec0bccSwdenk6.  Debug and solve any problems that might arise.
4470c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
4471c609719bSwdenk
4472c609719bSwdenk
4473c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
4474c609719bSwdenk==============================================================
4475c609719bSwdenk
4476c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
4477c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
4478c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
4479c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
4480218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
4481c609719bSwdenk
4482c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
4483c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
4484c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
4485c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
4486c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
44877152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
4488218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
4489218ca724SWolfgang Denkyou can type
4490c609719bSwdenk
4491c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
4492c609719bSwdenk
4493c609719bSwdenkor to build on a native PowerPC system you can type
4494c609719bSwdenk
4495c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
4496c609719bSwdenk
4497218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
4498218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
4499218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
4500218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
4501218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
4502218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
4503218ca724SWolfgang Denkvariable. For example:
4504baf31249SMarian Balakowicz
4505baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4506baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
4507baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
4508baf31249SMarian Balakowicz
4509218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
4510218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
4511218ca724SWolfgang Denkduring the whole build process.
4512baf31249SMarian Balakowicz
4513baf31249SMarian Balakowicz
4514c609719bSwdenkSee also "U-Boot Porting Guide" below.
4515c609719bSwdenk
4516c609719bSwdenk
4517c609719bSwdenkMonitor Commands - Overview:
4518c609719bSwdenk============================
4519c609719bSwdenk
4520c609719bSwdenkgo	- start application at address 'addr'
4521c609719bSwdenkrun	- run commands in an environment variable
4522c609719bSwdenkbootm	- boot application image from memory
4523c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
452444f074c7SMarek Vasutbootz   - boot zImage from memory
4525c609719bSwdenktftpboot- boot image via network using TFTP protocol
4526c609719bSwdenk	       and env variables "ipaddr" and "serverip"
4527c609719bSwdenk	       (and eventually "gatewayip")
45281fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
4529c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
4530c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
4531c609719bSwdenkloads	- load S-Record file over serial line
4532c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
4533c609719bSwdenkmd	- memory display
4534c609719bSwdenkmm	- memory modify (auto-incrementing)
4535c609719bSwdenknm	- memory modify (constant address)
4536c609719bSwdenkmw	- memory write (fill)
4537c609719bSwdenkcp	- memory copy
4538c609719bSwdenkcmp	- memory compare
4539c609719bSwdenkcrc32	- checksum calculation
45400f89c54bSPeter Tyseri2c	- I2C sub-system
4541c609719bSwdenksspi	- SPI utility commands
4542c609719bSwdenkbase	- print or set address offset
4543c609719bSwdenkprintenv- print environment variables
4544c609719bSwdenksetenv	- set environment variables
4545c609719bSwdenksaveenv - save environment variables to persistent storage
4546c609719bSwdenkprotect - enable or disable FLASH write protection
4547c609719bSwdenkerase	- erase FLASH memory
4548c609719bSwdenkflinfo	- print FLASH memory information
454910635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
4550c609719bSwdenkbdinfo	- print Board Info structure
4551c609719bSwdenkiminfo	- print header information for application image
4552c609719bSwdenkconinfo - print console devices and informations
4553c609719bSwdenkide	- IDE sub-system
4554c609719bSwdenkloop	- infinite loop on address range
455556523f12Swdenkloopw	- infinite write loop on address range
4556c609719bSwdenkmtest	- simple RAM test
4557c609719bSwdenkicache	- enable or disable instruction cache
4558c609719bSwdenkdcache	- enable or disable data cache
4559c609719bSwdenkreset	- Perform RESET of the CPU
4560c609719bSwdenkecho	- echo args to console
4561c609719bSwdenkversion - print monitor version
4562c609719bSwdenkhelp	- print online help
4563c609719bSwdenk?	- alias for 'help'
4564c609719bSwdenk
4565c609719bSwdenk
4566c609719bSwdenkMonitor Commands - Detailed Description:
4567c609719bSwdenk========================================
4568c609719bSwdenk
4569c609719bSwdenkTODO.
4570c609719bSwdenk
4571c609719bSwdenkFor now: just type "help <command>".
4572c609719bSwdenk
4573c609719bSwdenk
4574c609719bSwdenkEnvironment Variables:
4575c609719bSwdenk======================
4576c609719bSwdenk
4577c609719bSwdenkU-Boot supports user configuration using Environment Variables which
4578c609719bSwdenkcan be made persistent by saving to Flash memory.
4579c609719bSwdenk
4580c609719bSwdenkEnvironment Variables are set using "setenv", printed using
4581c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
4582c609719bSwdenkwithout a value can be used to delete a variable from the
4583c609719bSwdenkenvironment. As long as you don't save the environment you are
4584c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
4585c609719bSwdenkenvironment is erased by accident, a default environment is provided.
4586c609719bSwdenk
4587c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
4588c96f86eeSWolfgang Denk
4589c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
4590c609719bSwdenk
4591c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
4592c609719bSwdenk
4593c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
4594c609719bSwdenk
4595c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
4596c609719bSwdenk
4597c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
4598c609719bSwdenk
4599c609719bSwdenk  bootfile	- Name of the image to load with TFTP
4600c609719bSwdenk
46017d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
46027d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
46037d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
46047d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
46057d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
46067d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
4607c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4608c3624e6eSGrant Likely		  bootm_mapsize.
4609c3624e6eSGrant Likely
4610c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
4611c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
4612c3624e6eSGrant Likely		  defines the size of the memory region starting at base
4613c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
4614c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
4615c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
4616c3624e6eSGrant Likely		  used otherwise.
46177d721e34SBartlomiej Sieka
46187d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
46197d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
46207d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
46217d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
46227d721e34SBartlomiej Sieka		  environment variable.
46237d721e34SBartlomiej Sieka
46244bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
46254bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
46264bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
46274bae9090SBartlomiej Sieka
4628c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
4629c609719bSwdenk		  "bootp" will just load perform a lookup of the
4630c609719bSwdenk		  configuration from the BOOTP server, but not try to
4631c609719bSwdenk		  load any image using TFTP
4632c609719bSwdenk
4633c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
4634c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
4635c609719bSwdenk		  be automatically started (by internally calling
4636c609719bSwdenk		  "bootm")
4637c609719bSwdenk
46384a6fd34bSwdenk		  If set to "no", a standalone image passed to the
46394a6fd34bSwdenk		  "bootm" command will be copied to the load address
46404a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
46414a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
46424a6fd34bSwdenk		  data.
46434a6fd34bSwdenk
4644a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
4645a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
4646fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
4647fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
4648fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
4649fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
4650fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
4651fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
4652fa34f6b2SShawn Guo		  access it during the boot procedure.
4653fa34f6b2SShawn Guo
4654a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
4655a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
4656a28afca5SDavid A. Long		  to work it must reside in writable memory, have
4657a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
4658a28afca5SDavid A. Long		  add the information it needs into it, and the memory
4659a28afca5SDavid A. Long		  must be accessible by the kernel.
4660a28afca5SDavid A. Long
4661eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
4662eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
4663eea63e05SSimon Glass		  defined.
4664eea63e05SSimon Glass
466517ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
466617ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
466717ea1177Swdenk		  mode (400kHZ). This environment variable is used in
466817ea1177Swdenk		  initialization code. So, for changes to be effective
466917ea1177Swdenk		  it must be saved and board must be reset.
467017ea1177Swdenk
4671c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
4672c609719bSwdenk		  If this variable is not set, initrd images will be
4673c609719bSwdenk		  copied to the highest possible address in RAM; this
4674c609719bSwdenk		  is usually what you want since it allows for
4675c609719bSwdenk		  maximum initrd size. If for some reason you want to
4676c609719bSwdenk		  make sure that the initrd image is loaded below the
46776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4678c609719bSwdenk		  variable to a value of "no" or "off" or "0".
4679c609719bSwdenk		  Alternatively, you can set it to a maximum upper
4680c609719bSwdenk		  address to use (U-Boot will still check that it
4681c609719bSwdenk		  does not overwrite the U-Boot stack and data).
4682c609719bSwdenk
4683c609719bSwdenk		  For instance, when you have a system with 16 MB
46847152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
4685c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
4686c609719bSwdenk		  the "bootargs" variable. However, now you must make
46877152b1d0Swdenk		  sure that the initrd image is placed in the first
4688c609719bSwdenk		  12 MB as well - this can be done with
4689c609719bSwdenk
4690c609719bSwdenk		  setenv initrd_high 00c00000
4691c609719bSwdenk
469238b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
469338b99261Swdenk		  indication to U-Boot that all addresses are legal
469438b99261Swdenk		  for the Linux kernel, including addresses in flash
469538b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
469638b99261Swdenk		  ramdisk at all. This may be useful to reduce the
469738b99261Swdenk		  boot time on your system, but requires that this
469838b99261Swdenk		  feature is supported by your Linux kernel.
469938b99261Swdenk
4700c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
4701c609719bSwdenk
4702c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
4703dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
4704c609719bSwdenk
4705c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
4706c609719bSwdenk
4707c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
4708c609719bSwdenk
4709c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
4710c609719bSwdenk
4711c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
4712c609719bSwdenk
4713c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
4714c609719bSwdenk
4715e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
4716a3d991bdSwdenk
4717e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
4718e2a53458SMike Frysinger		  For example you can do the following
4719a3d991bdSwdenk
472048690d80SHeiko Schocher		  => setenv ethact FEC
472148690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
472248690d80SHeiko Schocher		  => setenv ethact SCC
472348690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
4724a3d991bdSwdenk
4725e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
4726e1692577SMatthias Fuchs		  available network interfaces.
4727e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
4728e1692577SMatthias Fuchs
4729a3d991bdSwdenk  netretry	- When set to "no" each network operation will
4730a3d991bdSwdenk		  either succeed or fail without retrying.
47316e592385Swdenk		  When set to "once" the network operation will
47326e592385Swdenk		  fail when all the available network interfaces
47336e592385Swdenk		  are tried once without success.
4734a3d991bdSwdenk		  Useful on scripts which control the retry operation
4735a3d991bdSwdenk		  themselves.
4736a3d991bdSwdenk
4737b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
4738a1cf027aSJean-Christophe PLAGNIOL-VILLARD
47398d51aacdSSimon Glass  silent_linux  - If set then linux will be told to boot silently, by
47408d51aacdSSimon Glass		  changing the console to be empty. If "yes" it will be
47418d51aacdSSimon Glass		  made silent. If "no" it will not be made silent. If
47428d51aacdSSimon Glass		  unset, then it will be made silent if the U-Boot console
47438d51aacdSSimon Glass		  is silent.
47448d51aacdSSimon Glass
474528cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
4746ecb0ccd9SWolfgang Denk		  UDP source port.
4747ecb0ccd9SWolfgang Denk
474828cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
474928cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
475028cb9375SWolfgang Denk
4751c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
4752c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
4753c96f86eeSWolfgang Denk
4754c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
4755c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
4756c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
4757c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
4758c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
4759c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
4760c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
4761c96f86eeSWolfgang Denk
4762a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
476311ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
4764a3d991bdSwdenk		  VLAN tagged frames.
4765c609719bSwdenk
4766dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4767dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4768dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4769dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4770dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4771dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4772dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4773dc0b7b0eSJason Hobbs
4774dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4775dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4776dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4777dc0b7b0eSJason Hobbs
4778dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4779dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4780dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4781dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4782dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4783dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4784dc0b7b0eSJason Hobbs
4785c609719bSwdenkThe following environment variables may be used and automatically
4786c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4787c609719bSwdenkdepending the information provided by your boot server:
4788c609719bSwdenk
4789c609719bSwdenk  bootfile	- see above
4790c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4791fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4792c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4793c609719bSwdenk  hostname	- Target hostname
4794c609719bSwdenk  ipaddr	- see above
4795c609719bSwdenk  netmask	- Subnet Mask
4796c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4797c609719bSwdenk  serverip	- see above
4798c609719bSwdenk
4799c609719bSwdenk
4800c609719bSwdenkThere are two special Environment Variables:
4801c609719bSwdenk
4802c609719bSwdenk  serial#	- contains hardware identification information such
4803c609719bSwdenk		  as type string and/or serial number
4804c609719bSwdenk  ethaddr	- Ethernet address
4805c609719bSwdenk
4806c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4807c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4808c609719bSwdenkonce they have been set once.
4809c609719bSwdenk
4810c609719bSwdenk
4811c1551ea8SstroeseFurther special Environment Variables:
4812c1551ea8Sstroese
4813c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4814c1551ea8Sstroese		  with the "version" command. This variable is
4815c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4816c1551ea8Sstroese
4817c1551ea8Sstroese
4818c609719bSwdenkPlease note that changes to some configuration parameters may take
4819c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4820c609719bSwdenk
4821c609719bSwdenk
4822170ab110SJoe HershbergerCallback functions for environment variables:
4823170ab110SJoe Hershberger---------------------------------------------
4824170ab110SJoe Hershberger
4825170ab110SJoe HershbergerFor some environment variables, the behavior of u-boot needs to change
4826170ab110SJoe Hershbergerwhen their values are changed.  This functionailty allows functions to
4827170ab110SJoe Hershbergerbe associated with arbitrary variables.  On creation, overwrite, or
4828170ab110SJoe Hershbergerdeletion, the callback will provide the opportunity for some side
4829170ab110SJoe Hershbergereffect to happen or for the change to be rejected.
4830170ab110SJoe Hershberger
4831170ab110SJoe HershbergerThe callbacks are named and associated with a function using the
4832170ab110SJoe HershbergerU_BOOT_ENV_CALLBACK macro in your board or driver code.
4833170ab110SJoe Hershberger
4834170ab110SJoe HershbergerThese callbacks are associated with variables in one of two ways.  The
4835170ab110SJoe Hershbergerstatic list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4836170ab110SJoe Hershbergerin the board configuration to a string that defines a list of
4837170ab110SJoe Hershbergerassociations.  The list must be in the following format:
4838170ab110SJoe Hershberger
4839170ab110SJoe Hershberger	entry = variable_name[:callback_name]
4840170ab110SJoe Hershberger	list = entry[,list]
4841170ab110SJoe Hershberger
4842170ab110SJoe HershbergerIf the callback name is not specified, then the callback is deleted.
4843170ab110SJoe HershbergerSpaces are also allowed anywhere in the list.
4844170ab110SJoe Hershberger
4845170ab110SJoe HershbergerCallbacks can also be associated by defining the ".callbacks" variable
4846170ab110SJoe Hershbergerwith the same list format above.  Any association in ".callbacks" will
4847170ab110SJoe Hershbergeroverride any association in the static list. You can define
4848170ab110SJoe HershbergerCONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4849170ab110SJoe Hershberger".callbacks" envirnoment variable in the default or embedded environment.
4850170ab110SJoe Hershberger
4851170ab110SJoe Hershberger
4852f07771ccSwdenkCommand Line Parsing:
4853f07771ccSwdenk=====================
4854f07771ccSwdenk
4855f07771ccSwdenkThere are two different command line parsers available with U-Boot:
48567152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
4857f07771ccSwdenk
4858f07771ccSwdenkOld, simple command line parser:
4859f07771ccSwdenk--------------------------------
4860f07771ccSwdenk
4861f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4862f07771ccSwdenk- several commands on one line, separated by ';'
4863fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4864f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4865f07771ccSwdenk  for example:
4866fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4867f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4868f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4869f07771ccSwdenk
4870f07771ccSwdenkHush shell:
4871f07771ccSwdenk-----------
4872f07771ccSwdenk
4873f07771ccSwdenk- similar to Bourne shell, with control structures like
4874f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4875f07771ccSwdenk  until...do...done, ...
4876f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4877f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4878f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4879f07771ccSwdenk  command
4880f07771ccSwdenk
4881f07771ccSwdenkGeneral rules:
4882f07771ccSwdenk--------------
4883f07771ccSwdenk
4884f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4885f07771ccSwdenk    command) contains several commands separated by semicolon, and
4886f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4887f07771ccSwdenk    executed anyway.
4888f07771ccSwdenk
4889f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
489011ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4891f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4892f07771ccSwdenk    variables are not executed.
4893f07771ccSwdenk
4894c609719bSwdenkNote for Redundant Ethernet Interfaces:
4895c609719bSwdenk=======================================
4896c609719bSwdenk
489711ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4898c609719bSwdenksuch configurations and is capable of automatic selection of a
48997152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4900c609719bSwdenk
4901c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4902c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4903c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4904c609719bSwdenk
4905c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4906c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4907c609719bSwdenkding setting in the environment; if the corresponding environment
4908c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4909c609719bSwdenk
4910c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4911c609719bSwdenk  environment, the SROM's address is used.
4912c609719bSwdenk
4913c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4914c609719bSwdenk  environment exists, then the value from the environment variable is
4915c609719bSwdenk  used.
4916c609719bSwdenk
4917c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4918c609719bSwdenk  both addresses are the same, this MAC address is used.
4919c609719bSwdenk
4920c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4921c609719bSwdenk  addresses differ, the value from the environment is used and a
4922c609719bSwdenk  warning is printed.
4923c609719bSwdenk
4924c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4925c609719bSwdenk  is raised.
4926c609719bSwdenk
4927ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4928ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4929ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4930ecee9324SBen WarrenThe naming convention is as follows:
4931ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4932c609719bSwdenk
4933c609719bSwdenkImage Formats:
4934c609719bSwdenk==============
4935c609719bSwdenk
49363310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
49373310c549SMarian Balakowiczimages in two formats:
49383310c549SMarian Balakowicz
49393310c549SMarian BalakowiczNew uImage format (FIT)
49403310c549SMarian Balakowicz-----------------------
49413310c549SMarian Balakowicz
49423310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
49433310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
49443310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
49453310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
49463310c549SMarian Balakowicz
49473310c549SMarian Balakowicz
49483310c549SMarian BalakowiczOld uImage format
49493310c549SMarian Balakowicz-----------------
49503310c549SMarian Balakowicz
49513310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
49523310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
49533310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4954c609719bSwdenk
4955c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4956c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4957f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4958f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4959f5ed9e39SPeter Tyser  INTEGRITY).
49607b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4961afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4962afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4963c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4964c609719bSwdenk* Load Address
4965c609719bSwdenk* Entry Point
4966c609719bSwdenk* Image Name
4967c609719bSwdenk* Image Timestamp
4968c609719bSwdenk
4969c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4970c609719bSwdenkand the data portions of the image are secured against corruption by
4971c609719bSwdenkCRC32 checksums.
4972c609719bSwdenk
4973c609719bSwdenk
4974c609719bSwdenkLinux Support:
4975c609719bSwdenk==============
4976c609719bSwdenk
4977c609719bSwdenkAlthough U-Boot should support any OS or standalone application
49787152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4979c609719bSwdenkU-Boot.
4980c609719bSwdenk
4981c609719bSwdenkU-Boot includes many features that so far have been part of some
4982c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4983c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4984c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
49857152b1d0Swdenkserves several purposes:
4986c609719bSwdenk
4987c609719bSwdenk- the same features can be used for other OS or standalone
4988c609719bSwdenk  applications (for instance: using compressed images to reduce the
4989c609719bSwdenk  Flash memory footprint)
4990c609719bSwdenk
4991c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
49927152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4993c609719bSwdenk
4994c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4995c609719bSwdenk  images; of course this also means that different kernel images can
4996c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4997c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4998c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4999c609719bSwdenk  software is easier now.
5000c609719bSwdenk
5001c609719bSwdenk
5002c609719bSwdenkLinux HOWTO:
5003c609719bSwdenk============
5004c609719bSwdenk
5005c609719bSwdenkPorting Linux to U-Boot based systems:
5006c609719bSwdenk---------------------------------------
5007c609719bSwdenk
5008c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
5009c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
5010c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
5011c609719bSwdenkLinux :-).
5012c609719bSwdenk
5013a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
5014c609719bSwdenk
5015c609719bSwdenkJust make sure your machine specific header file (for instance
5016c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
50171dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
50181dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
50196d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
5020c609719bSwdenk
5021c609719bSwdenk
5022c609719bSwdenkConfiguring the Linux kernel:
5023c609719bSwdenk-----------------------------
5024c609719bSwdenk
5025c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
5026c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
5027c609719bSwdenk
5028c609719bSwdenk
5029c609719bSwdenkBuilding a Linux Image:
5030c609719bSwdenk-----------------------
5031c609719bSwdenk
503224ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
503324ee89b9Swdenknot used. If you use recent kernel source, a new build target
503424ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
503524ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
503624ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
503724ee89b9Swdenk100% compatible format.
5038c609719bSwdenk
5039c609719bSwdenkExample:
5040c609719bSwdenk
5041c609719bSwdenk	make TQM850L_config
5042c609719bSwdenk	make oldconfig
5043c609719bSwdenk	make dep
504424ee89b9Swdenk	make uImage
5045c609719bSwdenk
504624ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
504724ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
504824ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
5049c609719bSwdenk
505024ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
505124ee89b9Swdenk
505224ee89b9Swdenk* convert the kernel into a raw binary image:
505324ee89b9Swdenk
505424ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
505524ee89b9Swdenk				 -R .note -R .comment \
505624ee89b9Swdenk				 -S vmlinux linux.bin
505724ee89b9Swdenk
505824ee89b9Swdenk* compress the binary image:
505924ee89b9Swdenk
506024ee89b9Swdenk	gzip -9 linux.bin
506124ee89b9Swdenk
506224ee89b9Swdenk* package compressed binary image for U-Boot:
506324ee89b9Swdenk
506424ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
506524ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
506624ee89b9Swdenk		-d linux.bin.gz uImage
506724ee89b9Swdenk
506824ee89b9Swdenk
506924ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
507024ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
507124ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
507224ee89b9Swdenkbyte header containing information about target architecture,
507324ee89b9Swdenkoperating system, image type, compression method, entry points, time
507424ee89b9Swdenkstamp, CRC32 checksums, etc.
507524ee89b9Swdenk
507624ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
507724ee89b9Swdenkprint the header information, or to build new images.
5078c609719bSwdenk
5079c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
5080c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
5081c609719bSwdenkchecksum verification:
5082c609719bSwdenk
5083c609719bSwdenk	tools/mkimage -l image
5084c609719bSwdenk	  -l ==> list image header information
5085c609719bSwdenk
5086c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
5087c609719bSwdenkfrom a "data file" which is used as image payload:
5088c609719bSwdenk
5089c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
5090c609719bSwdenk		      -n name -d data_file image
5091c609719bSwdenk	  -A ==> set architecture to 'arch'
5092c609719bSwdenk	  -O ==> set operating system to 'os'
5093c609719bSwdenk	  -T ==> set image type to 'type'
5094c609719bSwdenk	  -C ==> set compression type 'comp'
5095c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
5096c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
5097c609719bSwdenk	  -n ==> set image name to 'name'
5098c609719bSwdenk	  -d ==> use image data from 'datafile'
5099c609719bSwdenk
510069459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
510169459791Swdenkaddress (0x00000000), but the entry point address depends on the
510269459791Swdenkkernel version:
5103c609719bSwdenk
5104c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
510524ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
5106c609719bSwdenk
5107c609719bSwdenkSo a typical call to build a U-Boot image would read:
5108c609719bSwdenk
510924ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
511024ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
5111a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
511224ee89b9Swdenk	> examples/uImage.TQM850L
511324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5114c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5115c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5116c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5117c609719bSwdenk	Load Address: 0x00000000
511824ee89b9Swdenk	Entry Point:  0x00000000
5119c609719bSwdenk
5120c609719bSwdenkTo verify the contents of the image (or check for corruption):
5121c609719bSwdenk
512224ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
512324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5124c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5125c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5126c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5127c609719bSwdenk	Load Address: 0x00000000
512824ee89b9Swdenk	Entry Point:  0x00000000
5129c609719bSwdenk
5130c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
5131c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
5132c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
5133c609719bSwdenkneed to be uncompressed:
5134c609719bSwdenk
5135a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
513624ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
513724ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
5138a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
513924ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
514024ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5141c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5142c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
5143c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
5144c609719bSwdenk	Load Address: 0x00000000
514524ee89b9Swdenk	Entry Point:  0x00000000
5146c609719bSwdenk
5147c609719bSwdenk
5148c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
5149c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
5150c609719bSwdenk
5151c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
5152c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
5153c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
5154c609719bSwdenk	Image Name:   Simple Ramdisk Image
5155c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
5156c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
5157c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
5158c609719bSwdenk	Load Address: 0x00000000
5159c609719bSwdenk	Entry Point:  0x00000000
5160c609719bSwdenk
5161c609719bSwdenk
5162c609719bSwdenkInstalling a Linux Image:
5163c609719bSwdenk-------------------------
5164c609719bSwdenk
5165c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
5166c609719bSwdenkyou must convert the image to S-Record format:
5167c609719bSwdenk
5168c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
5169c609719bSwdenk
5170c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
5171c609719bSwdenkimage header, so the resulting S-Record file will be relative to
5172c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
5173c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
5174c609719bSwdenkcommand.
5175c609719bSwdenk
5176c609719bSwdenkExample: install the image to address 0x40100000 (which on the
5177c609719bSwdenkTQM8xxL is in the first Flash bank):
5178c609719bSwdenk
5179c609719bSwdenk	=> erase 40100000 401FFFFF
5180c609719bSwdenk
5181c609719bSwdenk	.......... done
5182c609719bSwdenk	Erased 8 sectors
5183c609719bSwdenk
5184c609719bSwdenk	=> loads 40100000
5185c609719bSwdenk	## Ready for S-Record download ...
5186c609719bSwdenk	~>examples/image.srec
5187c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5188c609719bSwdenk	...
5189c609719bSwdenk	15989 15990 15991 15992
5190c609719bSwdenk	[file transfer complete]
5191c609719bSwdenk	[connected]
5192c609719bSwdenk	## Start Addr = 0x00000000
5193c609719bSwdenk
5194c609719bSwdenk
5195c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
5196c609719bSwdenkthis includes a checksum verification so you can be sure no data
5197c609719bSwdenkcorruption happened:
5198c609719bSwdenk
5199c609719bSwdenk	=> imi 40100000
5200c609719bSwdenk
5201c609719bSwdenk	## Checking Image at 40100000 ...
5202c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5203c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5204c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5205c609719bSwdenk	   Load Address: 00000000
5206c609719bSwdenk	   Entry Point:	 0000000c
5207c609719bSwdenk	   Verifying Checksum ... OK
5208c609719bSwdenk
5209c609719bSwdenk
5210c609719bSwdenkBoot Linux:
5211c609719bSwdenk-----------
5212c609719bSwdenk
5213c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
5214c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
5215c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
5216c609719bSwdenkparameters. You can check and modify this variable using the
5217c609719bSwdenk"printenv" and "setenv" commands:
5218c609719bSwdenk
5219c609719bSwdenk
5220c609719bSwdenk	=> printenv bootargs
5221c609719bSwdenk	bootargs=root=/dev/ram
5222c609719bSwdenk
5223c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5224c609719bSwdenk
5225c609719bSwdenk	=> printenv bootargs
5226c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5227c609719bSwdenk
5228c609719bSwdenk	=> bootm 40020000
5229c609719bSwdenk	## Booting Linux kernel at 40020000 ...
5230c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
5231c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5232c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
5233c609719bSwdenk	   Load Address: 00000000
5234c609719bSwdenk	   Entry Point:	 0000000c
5235c609719bSwdenk	   Verifying Checksum ... OK
5236c609719bSwdenk	   Uncompressing Kernel Image ... OK
5237c609719bSwdenk	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
5238c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5239c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5240c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5241c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5242c609719bSwdenk	...
5243c609719bSwdenk
524411ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
52457152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
5246c609719bSwdenkformat!) to the "bootm" command:
5247c609719bSwdenk
5248c609719bSwdenk	=> imi 40100000 40200000
5249c609719bSwdenk
5250c609719bSwdenk	## Checking Image at 40100000 ...
5251c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5252c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5253c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5254c609719bSwdenk	   Load Address: 00000000
5255c609719bSwdenk	   Entry Point:	 0000000c
5256c609719bSwdenk	   Verifying Checksum ... OK
5257c609719bSwdenk
5258c609719bSwdenk	## Checking Image at 40200000 ...
5259c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5260c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5261c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5262c609719bSwdenk	   Load Address: 00000000
5263c609719bSwdenk	   Entry Point:	 00000000
5264c609719bSwdenk	   Verifying Checksum ... OK
5265c609719bSwdenk
5266c609719bSwdenk	=> bootm 40100000 40200000
5267c609719bSwdenk	## Booting Linux kernel at 40100000 ...
5268c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5269c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5270c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5271c609719bSwdenk	   Load Address: 00000000
5272c609719bSwdenk	   Entry Point:	 0000000c
5273c609719bSwdenk	   Verifying Checksum ... OK
5274c609719bSwdenk	   Uncompressing Kernel Image ... OK
5275c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
5276c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5277c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5278c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5279c609719bSwdenk	   Load Address: 00000000
5280c609719bSwdenk	   Entry Point:	 00000000
5281c609719bSwdenk	   Verifying Checksum ... OK
5282c609719bSwdenk	   Loading Ramdisk ... OK
5283c609719bSwdenk	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
5284c609719bSwdenk	Boot arguments: root=/dev/ram
5285c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5286c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5287c609719bSwdenk	...
5288c609719bSwdenk	RAMDISK: Compressed image found at block 0
5289c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
5290c609719bSwdenk
5291c609719bSwdenk	bash#
5292c609719bSwdenk
52930267768eSMatthew McClintockBoot Linux and pass a flat device tree:
52940267768eSMatthew McClintock-----------
52950267768eSMatthew McClintock
52960267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
52970267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
52980267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
52990267768eSMatthew McClintockflat device tree:
53000267768eSMatthew McClintock
53010267768eSMatthew McClintock=> print oftaddr
53020267768eSMatthew McClintockoftaddr=0x300000
53030267768eSMatthew McClintock=> print oft
53040267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
53050267768eSMatthew McClintock=> tftp $oftaddr $oft
53060267768eSMatthew McClintockSpeed: 1000, full duplex
53070267768eSMatthew McClintockUsing TSEC0 device
53080267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
53090267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
53100267768eSMatthew McClintockLoad address: 0x300000
53110267768eSMatthew McClintockLoading: #
53120267768eSMatthew McClintockdone
53130267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
53140267768eSMatthew McClintock=> tftp $loadaddr $bootfile
53150267768eSMatthew McClintockSpeed: 1000, full duplex
53160267768eSMatthew McClintockUsing TSEC0 device
53170267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
53180267768eSMatthew McClintockFilename 'uImage'.
53190267768eSMatthew McClintockLoad address: 0x200000
53200267768eSMatthew McClintockLoading:############
53210267768eSMatthew McClintockdone
53220267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
53230267768eSMatthew McClintock=> print loadaddr
53240267768eSMatthew McClintockloadaddr=200000
53250267768eSMatthew McClintock=> print oftaddr
53260267768eSMatthew McClintockoftaddr=0x300000
53270267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
53280267768eSMatthew McClintock## Booting image at 00200000 ...
53290267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
53300267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
53310267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
53320267768eSMatthew McClintock   Load Address: 00000000
53330267768eSMatthew McClintock   Entry Point:	 00000000
53340267768eSMatthew McClintock   Verifying Checksum ... OK
53350267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
53360267768eSMatthew McClintockBooting using flat device tree at 0x300000
53370267768eSMatthew McClintockUsing MPC85xx ADS machine description
53380267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
53390267768eSMatthew McClintock[snip]
53400267768eSMatthew McClintock
53410267768eSMatthew McClintock
53426069ff26SwdenkMore About U-Boot Image Types:
53436069ff26Swdenk------------------------------
53446069ff26Swdenk
53456069ff26SwdenkU-Boot supports the following image types:
53466069ff26Swdenk
53476069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
53486069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
53496069ff26Swdenk	well) you can continue to work in U-Boot after return from
53506069ff26Swdenk	the Standalone Program.
53516069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
53526069ff26Swdenk	will take over control completely. Usually these programs
53536069ff26Swdenk	will install their own set of exception handlers, device
53546069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
53556069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
53566069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
53576069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
53586069ff26Swdenk	being started.
53596069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
53606069ff26Swdenk	(Linux) kernel image and one or more data images like
53616069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
53626069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
53636069ff26Swdenk	server provides just a single image file, but you want to get
53646069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
53656069ff26Swdenk
53666069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
53676069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
53686069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
53696069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
53706069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
53716069ff26Swdenk	a multiple of 4 bytes).
53726069ff26Swdenk
53736069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
53746069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
53756069ff26Swdenk	flash memory.
53766069ff26Swdenk
53776069ff26Swdenk   "Script files" are command sequences that will be executed by
53786069ff26Swdenk	U-Boot's command interpreter; this feature is especially
53796069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
53806069ff26Swdenk	as command interpreter.
53816069ff26Swdenk
538244f074c7SMarek VasutBooting the Linux zImage:
538344f074c7SMarek Vasut-------------------------
538444f074c7SMarek Vasut
538544f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
538644f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
538744f074c7SMarek Vasutas the syntax of "bootm" command.
538844f074c7SMarek Vasut
53898ac28563STom RiniNote, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
5390017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
5391017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
5392017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
5393017e1f3fSMarek Vasut
5394c609719bSwdenk
5395c609719bSwdenkStandalone HOWTO:
5396c609719bSwdenk=================
5397c609719bSwdenk
5398c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
5399c609719bSwdenkrun "standalone" applications, which can use some resources of
5400c609719bSwdenkU-Boot like console I/O functions or interrupt services.
5401c609719bSwdenk
5402c609719bSwdenkTwo simple examples are included with the sources:
5403c609719bSwdenk
5404c609719bSwdenk"Hello World" Demo:
5405c609719bSwdenk-------------------
5406c609719bSwdenk
5407c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
5408c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
5409c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
5410c609719bSwdenklike that:
5411c609719bSwdenk
5412c609719bSwdenk	=> loads
5413c609719bSwdenk	## Ready for S-Record download ...
5414c609719bSwdenk	~>examples/hello_world.srec
5415c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5416c609719bSwdenk	[file transfer complete]
5417c609719bSwdenk	[connected]
5418c609719bSwdenk	## Start Addr = 0x00040004
5419c609719bSwdenk
5420c609719bSwdenk	=> go 40004 Hello World! This is a test.
5421c609719bSwdenk	## Starting application at 0x00040004 ...
5422c609719bSwdenk	Hello World
5423c609719bSwdenk	argc = 7
5424c609719bSwdenk	argv[0] = "40004"
5425c609719bSwdenk	argv[1] = "Hello"
5426c609719bSwdenk	argv[2] = "World!"
5427c609719bSwdenk	argv[3] = "This"
5428c609719bSwdenk	argv[4] = "is"
5429c609719bSwdenk	argv[5] = "a"
5430c609719bSwdenk	argv[6] = "test."
5431c609719bSwdenk	argv[7] = "<NULL>"
5432c609719bSwdenk	Hit any key to exit ...
5433c609719bSwdenk
5434c609719bSwdenk	## Application terminated, rc = 0x0
5435c609719bSwdenk
5436c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
5437c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
5438c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
5439c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
5440c609719bSwdenkcharacter, but this is just a demo program. The application can be
5441c609719bSwdenkcontrolled by the following keys:
5442c609719bSwdenk
5443c609719bSwdenk	? - print current values og the CPM Timer registers
5444c609719bSwdenk	b - enable interrupts and start timer
5445c609719bSwdenk	e - stop timer and disable interrupts
5446c609719bSwdenk	q - quit application
5447c609719bSwdenk
5448c609719bSwdenk	=> loads
5449c609719bSwdenk	## Ready for S-Record download ...
5450c609719bSwdenk	~>examples/timer.srec
5451c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5452c609719bSwdenk	[file transfer complete]
5453c609719bSwdenk	[connected]
5454c609719bSwdenk	## Start Addr = 0x00040004
5455c609719bSwdenk
5456c609719bSwdenk	=> go 40004
5457c609719bSwdenk	## Starting application at 0x00040004 ...
5458c609719bSwdenk	TIMERS=0xfff00980
5459c609719bSwdenk	Using timer 1
5460c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5461c609719bSwdenk
5462c609719bSwdenkHit 'b':
5463c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
5464c609719bSwdenk	Enabling timer
5465c609719bSwdenkHit '?':
5466c609719bSwdenk	[q, b, e, ?] ........
5467c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5468c609719bSwdenkHit '?':
5469c609719bSwdenk	[q, b, e, ?] .
5470c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5471c609719bSwdenkHit '?':
5472c609719bSwdenk	[q, b, e, ?] .
5473c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5474c609719bSwdenkHit '?':
5475c609719bSwdenk	[q, b, e, ?] .
5476c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5477c609719bSwdenkHit 'e':
5478c609719bSwdenk	[q, b, e, ?] ...Stopping timer
5479c609719bSwdenkHit 'q':
5480c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
5481c609719bSwdenk
5482c609719bSwdenk
548385ec0bccSwdenkMinicom warning:
548485ec0bccSwdenk================
548585ec0bccSwdenk
54867152b1d0SwdenkOver time, many people have reported problems when trying to use the
548785ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
548885ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
5489f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
549085ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
5491e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
5492e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5493e53515a2SKarl O. Pincfor help with kermit.
5494e53515a2SKarl O. Pinc
549585ec0bccSwdenk
549652f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
549752f52c14Swdenkconfiguration to your "File transfer protocols" section:
549852f52c14Swdenk
549952f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
550052f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
550152f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
550252f52c14Swdenk
550352f52c14Swdenk
5504c609719bSwdenkNetBSD Notes:
5505c609719bSwdenk=============
5506c609719bSwdenk
5507c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
5508c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
5509c609719bSwdenk
5510c609719bSwdenkBuilding requires a cross environment; it is known to work on
5511c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5512c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
5513c609719bSwdenkNote that the cross-powerpc package does not install include files;
5514c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
5515c609719bSwdenkmissing.  This file has to be installed and patched manually:
5516c609719bSwdenk
5517c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
5518c609719bSwdenk	# mkdir powerpc
5519c609719bSwdenk	# ln -s powerpc machine
5520c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5521c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
5522c609719bSwdenk
5523c609719bSwdenkNative builds *don't* work due to incompatibilities between native
5524c609719bSwdenkand U-Boot include files.
5525c609719bSwdenk
5526c609719bSwdenkBooting assumes that (the first part of) the image booted is a
5527c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
5528c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
5529c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
55302a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5531c609719bSwdenk
5532c609719bSwdenk
5533c609719bSwdenkImplementation Internals:
5534c609719bSwdenk=========================
5535c609719bSwdenk
5536c609719bSwdenkThe following is not intended to be a complete description of every
5537c609719bSwdenkimplementation detail. However, it should help to understand the
5538c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
5539c609719bSwdenkhardware.
5540c609719bSwdenk
5541c609719bSwdenk
5542c609719bSwdenkInitial Stack, Global Data:
5543c609719bSwdenk---------------------------
5544c609719bSwdenk
5545c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
5546c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
5547c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
5548c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
5549c609719bSwdenkis not initialized as zero. To be able to get a C environment working
5550c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
5551c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
5552c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
5553c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
5554c609719bSwdenklocked as (mis-) used as memory, etc.
5555c609719bSwdenk
55567152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
55570668236bSWolfgang Denk	U-Boot mailing list:
555843d9616cSwdenk
555943d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
556043d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
556143d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
556243d9616cSwdenk	...
556343d9616cSwdenk
556443d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
556543d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
556643d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
556743d9616cSwdenk	is that the cache is being used as a temporary supply of
556843d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
556911ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
557043d9616cSwdenk	can see how this works by studying the cache architecture and
557143d9616cSwdenk	operation in the architecture and processor-specific manuals.
557243d9616cSwdenk
557343d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
557443d9616cSwdenk	is another option for the system designer to use as an
557511ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
557643d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
557743d9616cSwdenk	board designers haven't used it for something that would
557843d9616cSwdenk	cause you grief during the initial boot! It is frequently not
557943d9616cSwdenk	used.
558043d9616cSwdenk
55816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
558243d9616cSwdenk	with your processor/board/system design. The default value
558343d9616cSwdenk	you will find in any recent u-boot distribution in
55848a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
558543d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
558643d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
558743d9616cSwdenk	that are supposed to respond to that address! That code in
558843d9616cSwdenk	start.S has been around a while and should work as is when
558943d9616cSwdenk	you get the config right.
559043d9616cSwdenk
559143d9616cSwdenk	-Chris Hallinan
559243d9616cSwdenk	DS4.COM, Inc.
559343d9616cSwdenk
5594c609719bSwdenkIt is essential to remember this, since it has some impact on the C
5595c609719bSwdenkcode for the initialization procedures:
5596c609719bSwdenk
5597c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
5598c609719bSwdenk  to write it.
5599c609719bSwdenk
560011ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
5601c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
56027152b1d0Swdenk  zation is performed later (when relocating to RAM).
5603c609719bSwdenk
5604c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
5605c609719bSwdenk  that.
5606c609719bSwdenk
5607c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
5608c609719bSwdenknormal global data to share information beween the code. But it
5609c609719bSwdenkturned out that the implementation of U-Boot can be greatly
5610c609719bSwdenksimplified by making a global data structure (gd_t) available to all
5611c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
5612c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
5613c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
5614c609719bSwdenkplace a pointer (gd) to the global data into a register which we
5615c609719bSwdenkreserve for this purpose.
5616c609719bSwdenk
56177152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
5618c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
5619c609719bSwdenkGCC's implementation.
5620c609719bSwdenk
5621c609719bSwdenkFor PowerPC, the following registers have specific use:
5622c609719bSwdenk	R1:	stack pointer
5623e7670f6cSWolfgang Denk	R2:	reserved for system use
5624c609719bSwdenk	R3-R4:	parameter passing and return values
5625c609719bSwdenk	R5-R10: parameter passing
5626c609719bSwdenk	R13:	small data area pointer
5627c609719bSwdenk	R30:	GOT pointer
5628c609719bSwdenk	R31:	frame pointer
5629c609719bSwdenk
5630e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
5631e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
5632e6bee808SJoakim Tjernlund	going back and forth between asm and C)
5633c609719bSwdenk
5634e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
5635c609719bSwdenk
5636c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
5637c609719bSwdenk    address of the global data structure is known at compile time),
5638c609719bSwdenk    but it turned out that reserving a register results in somewhat
5639c609719bSwdenk    smaller code - although the code savings are not that big (on
5640c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
5641c609719bSwdenk    624 text + 127 data).
5642c609719bSwdenk
5643c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
56444c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
56454c58eb55SMike Frysinger
5646c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
56474c58eb55SMike Frysinger
5648c609719bSwdenkOn ARM, the following registers are used:
5649c609719bSwdenk
5650c609719bSwdenk	R0:	function argument word/integer result
5651c609719bSwdenk	R1-R3:	function argument word
565212eba1b4SJeroen Hofstee	R9:	platform specific
565312eba1b4SJeroen Hofstee	R10:	stack limit (used only if stack checking is enabled)
5654c609719bSwdenk	R11:	argument (frame) pointer
5655c609719bSwdenk	R12:	temporary workspace
5656c609719bSwdenk	R13:	stack pointer
5657c609719bSwdenk	R14:	link register
5658c609719bSwdenk	R15:	program counter
5659c609719bSwdenk
566012eba1b4SJeroen Hofstee    ==> U-Boot will use R9 to hold a pointer to the global data
566112eba1b4SJeroen Hofstee
566212eba1b4SJeroen Hofstee    Note: on ARM, only R_ARM_RELATIVE relocations are supported.
5663c609719bSwdenk
56640df01fd3SThomas ChouOn Nios II, the ABI is documented here:
56650df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
56660df01fd3SThomas Chou
56670df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
56680df01fd3SThomas Chou
56690df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
56700df01fd3SThomas Chou    to access small data sections, so gp is free.
56710df01fd3SThomas Chou
5672afc1ce82SMacpaul LinOn NDS32, the following registers are used:
5673afc1ce82SMacpaul Lin
5674afc1ce82SMacpaul Lin	R0-R1:	argument/return
5675afc1ce82SMacpaul Lin	R2-R5:	argument
5676afc1ce82SMacpaul Lin	R15:	temporary register for assembler
5677afc1ce82SMacpaul Lin	R16:	trampoline register
5678afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
5679afc1ce82SMacpaul Lin	R29:	global pointer (GP)
5680afc1ce82SMacpaul Lin	R30:	link register (LP)
5681afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
5682afc1ce82SMacpaul Lin	PC:	program counter (PC)
5683afc1ce82SMacpaul Lin
5684afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
5685afc1ce82SMacpaul Lin
5686d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5687d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
5688c609719bSwdenk
5689c609719bSwdenkMemory Management:
5690c609719bSwdenk------------------
5691c609719bSwdenk
5692c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
5693c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
5694c609719bSwdenk
5695c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
5696c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
5697c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
5698c609719bSwdenkphysical memory banks.
5699c609719bSwdenk
5700c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
5701c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5702c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
5703c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
57046d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5705c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
5706c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
5707c609719bSwdenk
5708c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
5709c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
5710c609719bSwdenk
5711c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
5712c609719bSwdenkthis:
5713c609719bSwdenk
5714c609719bSwdenk	0x0000 0000	Exception Vector code
5715c609719bSwdenk	      :
5716c609719bSwdenk	0x0000 1FFF
5717c609719bSwdenk	0x0000 2000	Free for Application Use
5718c609719bSwdenk	      :
5719c609719bSwdenk	      :
5720c609719bSwdenk
5721c609719bSwdenk	      :
5722c609719bSwdenk	      :
5723c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
5724c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
5725c609719bSwdenk	0x00FC 0000	Malloc Arena
5726c609719bSwdenk	      :
5727c609719bSwdenk	0x00FD FFFF
5728c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
5729c609719bSwdenk	...		eventually: LCD or video framebuffer
5730c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
5731c609719bSwdenk	0x00FF FFFF	[End of RAM]
5732c609719bSwdenk
5733c609719bSwdenk
5734c609719bSwdenkSystem Initialization:
5735c609719bSwdenk----------------------
5736c609719bSwdenk
5737c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
573811ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
5739c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
57407152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
5741c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
5742c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
5743c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
5744c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
5745c609719bSwdenkthe caches and the SIU.
5746c609719bSwdenk
5747c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
5748c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
5749c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5750c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5751c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
5752c609719bSwdenksimple memory test is run that determines the size of the SDRAM
5753c609719bSwdenkbanks.
5754c609719bSwdenk
5755c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
57567152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
5757c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
5758c609719bSwdenk0x00000000, with any additional banks following immediately to create
5759c609719bSwdenkcontiguous memory starting from 0.
5760c609719bSwdenk
5761c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
5762c609719bSwdenkand allocates memory for use by malloc() and for the global Board
5763c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
5764c609719bSwdenkpages, and the final stack is set up.
5765c609719bSwdenk
5766c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
5767c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
5768c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
5769c609719bSwdenknew address in RAM.
5770c609719bSwdenk
5771c609719bSwdenk
5772c609719bSwdenkU-Boot Porting Guide:
5773c609719bSwdenk----------------------
5774c609719bSwdenk
5775c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
57766aff3115Swdenklist, October 2002]
5777c609719bSwdenk
5778c609719bSwdenk
5779c609719bSwdenkint main(int argc, char *argv[])
5780c609719bSwdenk{
5781c609719bSwdenk	sighandler_t no_more_time;
5782c609719bSwdenk
5783c609719bSwdenk	signal(SIGALRM, no_more_time);
5784c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5785c609719bSwdenk
5786c609719bSwdenk	if (available_money > available_manpower) {
57876c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
5788c609719bSwdenk		return 0;
5789c609719bSwdenk	}
5790c609719bSwdenk
5791c609719bSwdenk	Download latest U-Boot source;
5792c609719bSwdenk
57930668236bSWolfgang Denk	Subscribe to u-boot mailing list;
57946aff3115Swdenk
57956c3fef28SJerry Van Baren	if (clueless)
5796c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
5797c609719bSwdenk
5798c609719bSwdenk	while (learning) {
5799c609719bSwdenk		Read the README file in the top level directory;
58007cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
58016c3fef28SJerry Van Baren		Read applicable doc/*.README;
5802c609719bSwdenk		Read the source, Luke;
58036c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5804c609719bSwdenk	}
5805c609719bSwdenk
58066c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
58076c3fef28SJerry Van Baren		Buy a BDI3000;
58086c3fef28SJerry Van Baren	else
5809c609719bSwdenk		Add a lot of aggravation and time;
5810c609719bSwdenk
58116c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
58126c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
58136c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
58146c3fef28SJerry Van Baren	} else {
5815c609719bSwdenk		Create your own board support subdirectory;
58166c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
58176c3fef28SJerry Van Baren	}
58186c3fef28SJerry Van Baren	Edit new board/<myboard> files
58196c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5820c609719bSwdenk
58216c3fef28SJerry Van Baren	while (!accepted) {
5822c609719bSwdenk		while (!running) {
5823c609719bSwdenk			do {
5824c609719bSwdenk				Add / modify source code;
5825c609719bSwdenk			} until (compiles);
5826c609719bSwdenk			Debug;
5827c609719bSwdenk			if (clueless)
5828c609719bSwdenk				email("Hi, I am having problems...");
5829c609719bSwdenk		}
58306c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
58316c3fef28SJerry Van Baren		if (reasonable critiques)
58326c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
58336c3fef28SJerry Van Baren		else
58346c3fef28SJerry Van Baren			Defend code as written;
58356c3fef28SJerry Van Baren	}
5836c609719bSwdenk
5837c609719bSwdenk	return 0;
5838c609719bSwdenk}
5839c609719bSwdenk
5840c609719bSwdenkvoid no_more_time (int sig)
5841c609719bSwdenk{
5842c609719bSwdenk      hire_a_guru();
5843c609719bSwdenk}
5844c609719bSwdenk
5845c609719bSwdenk
5846c609719bSwdenkCoding Standards:
5847c609719bSwdenk-----------------
5848c609719bSwdenk
5849c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
58502c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
58517ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
5852c609719bSwdenk
58532c051651SDetlev ZundelSource files originating from a different project (for example the
58542c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
58552c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
58562c051651SDetlev Zundelsources.
58572c051651SDetlev Zundel
58582c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
58592c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
58602c051651SDetlev Zundelin your code.
5861c609719bSwdenk
5862c178d3daSwdenkPlease also stick to the following formatting rules:
5863180d3f74Swdenk- remove any trailing white space
58647ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5865180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
58667ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5867180d3f74Swdenk- do not add trailing empty lines to source files
5868180d3f74Swdenk
5869c609719bSwdenkSubmissions which do not conform to the standards may be returned
5870c609719bSwdenkwith a request to reformat the changes.
5871c609719bSwdenk
5872c609719bSwdenk
5873c609719bSwdenkSubmitting Patches:
5874c609719bSwdenk-------------------
5875c609719bSwdenk
5876c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5877c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5878c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5879c609719bSwdenk
58800d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5881218ca724SWolfgang Denk
58820668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
58830668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
58840668236bSWolfgang Denk
5885c609719bSwdenkWhen you send a patch, please include the following information with
5886c609719bSwdenkit:
5887c609719bSwdenk
5888c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5889c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5890c609719bSwdenk  patch actually fixes something.
5891c609719bSwdenk
5892c609719bSwdenk* For new features: a description of the feature and your
5893c609719bSwdenk  implementation.
5894c609719bSwdenk
5895c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5896c609719bSwdenk
5897c609719bSwdenk* For major contributions, your entry to the CREDITS file
5898c609719bSwdenk
589927af930eSAlbert ARIBAUD* When you add support for a new board, don't forget to add a
590027af930eSAlbert ARIBAUD  maintainer e-mail address to the boards.cfg file, too.
5901c609719bSwdenk
5902c609719bSwdenk* If your patch adds new configuration options, don't forget to
5903c609719bSwdenk  document these in the README file.
5904c609719bSwdenk
5905218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5906218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
59077ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5908218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5909218ca724SWolfgang Denk  with some other mail clients.
5910c609719bSwdenk
5911218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5912218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5913218ca724SWolfgang Denk  GNU diff.
59146dff5529Swdenk
5915218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5916218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5917218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5918218ca724SWolfgang Denk  affected files).
5919218ca724SWolfgang Denk
5920218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5921218ca724SWolfgang Denk  and compressed attachments must not be used.
5922c609719bSwdenk
592352f52c14Swdenk* If one logical set of modifications affects or creates several
592452f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
592552f52c14Swdenk
592652f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
592752f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
592852f52c14Swdenk
592952f52c14Swdenk
5930c609719bSwdenkNotes:
5931c609719bSwdenk
5932c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5933c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5934c609719bSwdenk  for any of the boards.
5935c609719bSwdenk
5936c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5937c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5938c609719bSwdenk  returned with a request to re-formatting / split it.
5939c609719bSwdenk
5940c609719bSwdenk* If you modify existing code, make sure that your new code does not
5941c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5942c609719bSwdenk  When adding new features, these should compile conditionally only
5943c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5944c609719bSwdenk  disabled must not need more memory than the old code without your
5945c609719bSwdenk  modification.
594690dc6704Swdenk
59470668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
59480668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
59490668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
59500668236bSWolfgang Denk  bigger than the size limit should be avoided.
5951