xref: /openbmc/u-boot/README (revision 1086bfa9f49127e40a92b1225af1ed5e41f8fa1c)
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
708c609719bSwdenk- Console Baudrate:
709c609719bSwdenk		CONFIG_BAUDRATE - in bps
710c609719bSwdenk		Select one of the baudrates listed in
7116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
7126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
713c609719bSwdenk
714c92fac91SHeiko Schocher- Console Rx buffer length
715c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
716c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
7172b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
718c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
719c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
720c92fac91SHeiko Schocher		the SMC.
721c92fac91SHeiko Schocher
7229558b48aSGraeme Russ- Pre-Console Buffer:
7239558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
7249558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
7259558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
7269558b48aSGraeme Russ		buffer any console messages prior to the console being
7279558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
7289558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
7299558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
7309558b48aSGraeme Russ		bytes are output before the console is initialised, the
7319558b48aSGraeme Russ		earlier bytes are discarded.
7329558b48aSGraeme Russ
7339558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
7349558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
7359558b48aSGraeme Russ
736046a37bdSSonny Rao- Safe printf() functions
737046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
738046a37bdSSonny Rao		the printf() functions. These are defined in
739046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
740046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
741046a37bdSSonny Rao		If this option is not given then these functions will
742046a37bdSSonny Rao		silently discard their buffer size argument - this means
743046a37bdSSonny Rao		you are not getting any overflow checking in this case.
744046a37bdSSonny Rao
745c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
746c609719bSwdenk		Delay before automatically booting the default image;
747c609719bSwdenk		set to -1 to disable autoboot.
74893d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
74993d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
750c609719bSwdenk
751c609719bSwdenk		See doc/README.autoboot for these options that
752c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
753c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
754c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
755c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
756c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
757c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
758c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
759c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
760c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
761c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
762c609719bSwdenk		CONFIG_RESET_TO_RETRY
763c609719bSwdenk
764c609719bSwdenk- Autoboot Command:
765c609719bSwdenk		CONFIG_BOOTCOMMAND
766c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
767c609719bSwdenk		define a command string that is automatically executed
768c609719bSwdenk		when no character is read on the console interface
769c609719bSwdenk		within "Boot Delay" after reset.
770c609719bSwdenk
771c609719bSwdenk		CONFIG_BOOTARGS
772c609719bSwdenk		This can be used to pass arguments to the bootm
773c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
774c609719bSwdenk		environment value "bootargs".
775c609719bSwdenk
776c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
777c609719bSwdenk		The value of these goes into the environment as
778c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
779c609719bSwdenk		as a convenience, when switching between booting from
78011ccc33fSMarcel Ziswiler		RAM and NFS.
781c609719bSwdenk
782c609719bSwdenk- Pre-Boot Commands:
783c609719bSwdenk		CONFIG_PREBOOT
784c609719bSwdenk
785c609719bSwdenk		When this option is #defined, the existence of the
786c609719bSwdenk		environment variable "preboot" will be checked
787c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
788c609719bSwdenk		countdown and/or running the auto-boot command resp.
789c609719bSwdenk		entering interactive mode.
790c609719bSwdenk
791c609719bSwdenk		This feature is especially useful when "preboot" is
792c609719bSwdenk		automatically generated or modified. For an example
793c609719bSwdenk		see the LWMON board specific code: here "preboot" is
794c609719bSwdenk		modified when the user holds down a certain
795c609719bSwdenk		combination of keys on the (special) keyboard when
796c609719bSwdenk		booting the systems
797c609719bSwdenk
798c609719bSwdenk- Serial Download Echo Mode:
799c609719bSwdenk		CONFIG_LOADS_ECHO
800c609719bSwdenk		If defined to 1, all characters received during a
801c609719bSwdenk		serial download (using the "loads" command) are
802c609719bSwdenk		echoed back. This might be needed by some terminal
803c609719bSwdenk		emulations (like "cu"), but may as well just take
804c609719bSwdenk		time on others. This setting #define's the initial
805c609719bSwdenk		value of the "loads_echo" environment variable.
806c609719bSwdenk
807602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
808c609719bSwdenk		CONFIG_KGDB_BAUDRATE
809c609719bSwdenk		Select one of the baudrates listed in
8106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
811c609719bSwdenk
812c609719bSwdenk- Monitor Functions:
813602ad3b3SJon Loeliger		Monitor commands can be included or excluded
814602ad3b3SJon Loeliger		from the build by using the #include files
815c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
816c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
817602ad3b3SJon Loeliger		and augmenting with additional #define's
818602ad3b3SJon Loeliger		for wanted commands.
819c609719bSwdenk
820602ad3b3SJon Loeliger		The default command configuration includes all commands
821602ad3b3SJon Loeliger		except those marked below with a "*".
822602ad3b3SJon Loeliger
823602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
824602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
825602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
826602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
827602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
828602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
829602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
830602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
831710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
832602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
833602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
834602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
835a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
836a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
837a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
838a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
839602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
840602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
841246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
842602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
843602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
8445e2b3e0cSJoe Hershberger		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
845fffad71bSJoe Hershberger		CONFIG_CMD_ENV_FLAGS	* display details about env flags
8460c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
84703e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
84803e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
849bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
850602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
85103e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
852602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
853602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
854602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
8554d98b5c8SVincent Stehlé		CONFIG_CMD_FUSE		* Device fuse support
85653fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
857a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
858a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
859bf36c5d5SSimon Glass		CONFIG_CMD_HASH		* calculate hash / digest
860602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
861602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
862602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
863602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
8648fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS		  List all images found in NOR flash
8654d98b5c8SVincent Stehlé		CONFIG_CMD_IMLS_NAND	* List all images found in NAND flash
866602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
8670c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
868c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
869602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
870602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
871602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
872602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
8734d98b5c8SVincent Stehlé		CONFIG_CMD_LDRINFO	* ldrinfo (display Blackfin loader)
874d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
875d22c338eSJoe Hershberger					  (169.254.*.*)
876602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
877602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
8784d98b5c8SVincent Stehlé		CONFIG_CMD_MD5SUM	* print md5 message digest
87902c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
88015a33e49SSimon Glass		CONFIG_CMD_MEMINFO	* Display detailed memory information
881602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
882a2681707SWolfgang Denk					  loop, loopw
8834d98b5c8SVincent Stehlé		CONFIG_CMD_MEMTEST	* mtest
884602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
885602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
886602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
88768d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
888602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
889602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
8904d98b5c8SVincent Stehlé		CONFIG_CMD_NFS		  NFS support
891e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
892e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
893602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
894602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
895602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
896602ad3b3SJon Loeliger					  host
897602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
898ff048ea9SKenneth Waters		CONFIG_CMD_READ		* Read raw data from partition
899602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
900602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
901d304931fSSimon Glass		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
902602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
903602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
904602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
905602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
906602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
907602ad3b3SJon Loeliger					  (4xx only)
908f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
9094d98b5c8SVincent Stehlé		CONFIG_CMD_SHA1SUM	* print sha1 memory digest
91002c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
9117d861d95SBob Liu		CONFIG_CMD_SOFTSWITCH	* Soft switch setting command for BF60x
91274de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
913602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
9147a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
9151fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
916da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
917da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
918602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
919602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
920c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
9214d98b5c8SVincent Stehlé		CONFIG_CMD_XIMG		  Load part of Multi Image
922c609719bSwdenk
923c609719bSwdenk
924c609719bSwdenk		EXAMPLE: If you want all functions except of network
925c609719bSwdenk		support you can write:
926c609719bSwdenk
927602ad3b3SJon Loeliger		#include "config_cmd_all.h"
928602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
929c609719bSwdenk
930213bf8c8SGerald Van Baren	Other Commands:
931213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
932c609719bSwdenk
933c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
934602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
935c609719bSwdenk		what you (and your U-Boot users) are doing. Data
936c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
937c609719bSwdenk		8260 (where accesses to the IMMR region must be
938c609719bSwdenk		uncached), and it cannot be disabled on all other
939c609719bSwdenk		systems where we (mis-) use the data cache to hold an
940c609719bSwdenk		initial stack and some data.
941c609719bSwdenk
942c609719bSwdenk
943c609719bSwdenk		XXX - this list needs to get updated!
944c609719bSwdenk
945a5ecbe62SWolfgang Denk- Regular expression support:
946a5ecbe62SWolfgang Denk		CONFIG_REGEX
947a5ecbe62SWolfgang Denk		If this variable is defined, U-Boot is linked against
948a5ecbe62SWolfgang Denk		the SLRE (Super Light Regular Expression) library,
949a5ecbe62SWolfgang Denk		which adds regex support to some commands, as for
950a5ecbe62SWolfgang Denk		example "env grep" and "setexpr".
951a5ecbe62SWolfgang Denk
95245ba8077SSimon Glass- Device tree:
95345ba8077SSimon Glass		CONFIG_OF_CONTROL
95445ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
95545ba8077SSimon Glass		to configure its devices, instead of relying on statically
95645ba8077SSimon Glass		compiled #defines in the board file. This option is
95745ba8077SSimon Glass		experimental and only available on a few boards. The device
95845ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
95945ba8077SSimon Glass
9602c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
9612c0f79e4SSimon Glass		be done using one of the two options below:
962bbb0b128SSimon Glass
963bbb0b128SSimon Glass		CONFIG_OF_EMBED
964bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
965bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
966bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
967bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
968bbb0b128SSimon Glass		the global data structure as gd->blob.
96945ba8077SSimon Glass
9702c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
9712c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
9722c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
9732c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
9742c0f79e4SSimon Glass
9752c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
9762c0f79e4SSimon Glass
9772c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
9782c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
9792c0f79e4SSimon Glass		still use the individual files if you need something more
9802c0f79e4SSimon Glass		exotic.
9812c0f79e4SSimon Glass
982c609719bSwdenk- Watchdog:
983c609719bSwdenk		CONFIG_WATCHDOG
984c609719bSwdenk		If this variable is defined, it enables watchdog
9856abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
9866abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
9876abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
9886abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
9896abe6fb6SDetlev Zundel		available, then no further board specific code should
9906abe6fb6SDetlev Zundel		be needed to use it.
9916abe6fb6SDetlev Zundel
9926abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
9936abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
9946abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
9956abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
996c609719bSwdenk
997c1551ea8Sstroese- U-Boot Version:
998c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
999c1551ea8Sstroese		If this variable is defined, an environment variable
1000c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
1001c1551ea8Sstroese		version as printed by the "version" command.
1002a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
1003a1ea8e51SBenoît Thébaudeau		next reset.
1004c1551ea8Sstroese
1005c609719bSwdenk- Real-Time Clock:
1006c609719bSwdenk
1007602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
1008c609719bSwdenk		has to be selected, too. Define exactly one of the
1009c609719bSwdenk		following options:
1010c609719bSwdenk
1011c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
1012c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
10134e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
1014c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
10151cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
1016c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
10177f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
10183bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
10199536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
10204c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
10216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
102271d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
102371d19f30SHeiko Schocher					  RV3029 RTC.
1024c609719bSwdenk
1025b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
1026b37c7e5eSwdenk		must also be configured. See I2C Support, below.
1027b37c7e5eSwdenk
1028e92739d3SPeter Tyser- GPIO Support:
1029e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
1030e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
1031e92739d3SPeter Tyser
10325dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
10335dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
10345dec49caSChris Packham		pins supported by a particular chip.
10355dec49caSChris Packham
1036e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
1037e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
1038e92739d3SPeter Tyser
1039c609719bSwdenk- Timestamp Support:
1040c609719bSwdenk
1041c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
1042c609719bSwdenk		(date and time) of an image is printed by image
1043c609719bSwdenk		commands like bootm or iminfo. This option is
1044602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1045c609719bSwdenk
1046923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1047923c46f9SKarl O. Pinc		Zero or more of the following:
1048923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1049923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1050923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1051923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1052923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1053923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1054923c46f9SKarl O. Pinc				       disk/part_efi.c
1055923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1056c609719bSwdenk
1057602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1058218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1059923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1060c609719bSwdenk
1061c609719bSwdenk- IDE Reset method:
10624d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
10634d13cbadSwdenk		board configurations files but used nowhere!
1064c609719bSwdenk
10654d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
10664d13cbadSwdenk		be performed by calling the function
10674d13cbadSwdenk			ide_set_reset(int reset)
10684d13cbadSwdenk		which has to be defined in a board specific file
1069c609719bSwdenk
1070c609719bSwdenk- ATAPI Support:
1071c609719bSwdenk		CONFIG_ATAPI
1072c609719bSwdenk
1073c609719bSwdenk		Set this to enable ATAPI support.
1074c609719bSwdenk
1075c40b2956Swdenk- LBA48 Support
1076c40b2956Swdenk		CONFIG_LBA48
1077c40b2956Swdenk
1078c40b2956Swdenk		Set this to enable support for disks larger than 137GB
10794b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1080c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1081c40b2956Swdenk		support disks up to 2.1TB.
1082c40b2956Swdenk
10836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1084c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1085c40b2956Swdenk			Default is 32bit.
1086c40b2956Swdenk
1087c609719bSwdenk- SCSI Support:
1088c609719bSwdenk		At the moment only there is only support for the
1089c609719bSwdenk		SYM53C8XX SCSI controller; define
1090c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1091c609719bSwdenk
10926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
10936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
10946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1095c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1096c609719bSwdenk		devices.
10976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1098c609719bSwdenk
1099447c031bSStefan Reinauer		The environment variable 'scsidevs' is set to the number of
1100447c031bSStefan Reinauer		SCSI devices found during the last scan.
1101447c031bSStefan Reinauer
1102c609719bSwdenk- NETWORK Support (PCI):
1103682011ffSwdenk		CONFIG_E1000
1104ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1105ce5207e1SKyle Moffett
1106ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1107ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1108ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1109ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1110ce5207e1SKyle Moffett
1111ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1112ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1113ce5207e1SKyle Moffett		example with the "sspi" command.
1114ce5207e1SKyle Moffett
1115ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1116ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1117ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1118682011ffSwdenk
1119ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
112011ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1121ac3315c2SAndre Schwarz
1122c609719bSwdenk		CONFIG_EEPRO100
1123c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
112411ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1125c609719bSwdenk		write routine for first time initialisation.
1126c609719bSwdenk
1127c609719bSwdenk		CONFIG_TULIP
1128c609719bSwdenk		Support for Digital 2114x chips.
1129c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1130c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1131c609719bSwdenk
1132c609719bSwdenk		CONFIG_NATSEMI
1133c609719bSwdenk		Support for National dp83815 chips.
1134c609719bSwdenk
1135c609719bSwdenk		CONFIG_NS8382X
1136c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1137c609719bSwdenk
113845219c46Swdenk- NETWORK Support (other):
113945219c46Swdenk
1140c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1141c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1142c041e9d2SJens Scharsig
1143c041e9d2SJens Scharsig			CONFIG_RMII
1144c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1145c041e9d2SJens Scharsig
1146c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1147c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1148c041e9d2SJens Scharsig			The driver doen't show link status messages.
1149c041e9d2SJens Scharsig
1150efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1151efdd7319SRob Herring		Support for the Calxeda XGMAC device
1152efdd7319SRob Herring
11533bb46d23SAshok		CONFIG_LAN91C96
115445219c46Swdenk		Support for SMSC's LAN91C96 chips.
115545219c46Swdenk
115645219c46Swdenk			CONFIG_LAN91C96_BASE
115745219c46Swdenk			Define this to hold the physical address
115845219c46Swdenk			of the LAN91C96's I/O space
115945219c46Swdenk
116045219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
116145219c46Swdenk			Define this to enable 32 bit addressing
116245219c46Swdenk
11633bb46d23SAshok		CONFIG_SMC91111
1164f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1165f39748aeSwdenk
1166f39748aeSwdenk			CONFIG_SMC91111_BASE
1167f39748aeSwdenk			Define this to hold the physical address
1168f39748aeSwdenk			of the device (I/O space)
1169f39748aeSwdenk
1170f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1171f39748aeSwdenk			Define this if data bus is 32 bits
1172f39748aeSwdenk
1173f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1174f39748aeSwdenk			Define this to use i/o functions instead of macros
1175f39748aeSwdenk			(some hardware wont work with macros)
1176f39748aeSwdenk
1177dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1178dc02badaSHeiko Schocher		Support for davinci emac
1179dc02badaSHeiko Schocher
1180dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1181dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1182dc02badaSHeiko Schocher
1183b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1184b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1185b3dbf4a5SMacpaul Lin
1186b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1187b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1188b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1189b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1190b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1191b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1192b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1193b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1194b3dbf4a5SMacpaul Lin
1195c2fff331SMike Rapoport		CONFIG_SMC911X
1196557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1197557b377dSJens Gehrlein
1198c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1199557b377dSJens Gehrlein			Define this to hold the physical address
1200557b377dSJens Gehrlein			of the device (I/O space)
1201557b377dSJens Gehrlein
1202c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1203557b377dSJens Gehrlein			Define this if data bus is 32 bits
1204557b377dSJens Gehrlein
1205c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1206557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1207557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1208c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1209557b377dSJens Gehrlein
12103d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
12113d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
12123d0075faSYoshihiro Shimoda
12133d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
12143d0075faSYoshihiro Shimoda			Define the number of ports to be used
12153d0075faSYoshihiro Shimoda
12163d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
12173d0075faSYoshihiro Shimoda			Define the ETH PHY's address
12183d0075faSYoshihiro Shimoda
121968260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
122068260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
122168260aabSYoshihiro Shimoda
12225e124724SVadim Bendebury- TPM Support:
122390899cc0SChe-liang Chiou		CONFIG_TPM
122490899cc0SChe-liang Chiou		Support TPM devices.
122590899cc0SChe-liang Chiou
12261b393db5STom Wai-Hong Tam		CONFIG_TPM_TIS_I2C
12271b393db5STom Wai-Hong Tam		Support for i2c bus TPM devices. Only one device
12281b393db5STom Wai-Hong Tam		per system is supported at this time.
12291b393db5STom Wai-Hong Tam
12301b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BUS_NUMBER
12311b393db5STom Wai-Hong Tam			Define the the i2c bus number for the TPM device
12321b393db5STom Wai-Hong Tam
12331b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
12341b393db5STom Wai-Hong Tam			Define the TPM's address on the i2c bus
12351b393db5STom Wai-Hong Tam
12361b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BURST_LIMITATION
12371b393db5STom Wai-Hong Tam			Define the burst count bytes upper limit
12381b393db5STom Wai-Hong Tam
1239c01939c7SDirk Eibach		CONFIG_TPM_ATMEL_TWI
1240c01939c7SDirk Eibach		Support for Atmel TWI TPM device. Requires I2C support.
1241c01939c7SDirk Eibach
124290899cc0SChe-liang Chiou		CONFIG_TPM_TIS_LPC
12435e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
12445e124724SVadim Bendebury		per system is supported at this time.
12455e124724SVadim Bendebury
12465e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
12475e124724SVadim Bendebury			Base address where the generic TPM device is mapped
12485e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
12495e124724SVadim Bendebury			0xfed40000.
12505e124724SVadim Bendebury
1251be6c1529SReinhard Pfau		CONFIG_CMD_TPM
1252be6c1529SReinhard Pfau		Add tpm monitor functions.
1253be6c1529SReinhard Pfau		Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
1254be6c1529SReinhard Pfau		provides monitor access to authorized functions.
1255be6c1529SReinhard Pfau
1256be6c1529SReinhard Pfau		CONFIG_TPM
1257be6c1529SReinhard Pfau		Define this to enable the TPM support library which provides
1258be6c1529SReinhard Pfau		functional interfaces to some TPM commands.
1259be6c1529SReinhard Pfau		Requires support for a TPM device.
1260be6c1529SReinhard Pfau
1261be6c1529SReinhard Pfau		CONFIG_TPM_AUTH_SESSIONS
1262be6c1529SReinhard Pfau		Define this to enable authorized functions in the TPM library.
1263be6c1529SReinhard Pfau		Requires CONFIG_TPM and CONFIG_SHA1.
1264be6c1529SReinhard Pfau
1265c609719bSwdenk- USB Support:
1266c609719bSwdenk		At the moment only the UHCI host controller is
12674d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1268c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1269c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
127030d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1271c609719bSwdenk		storage devices.
1272c609719bSwdenk		Note:
1273c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1274c609719bSwdenk		(TEAC FD-05PUB).
12754d13cbadSwdenk		MPC5200 USB requires additional defines:
12764d13cbadSwdenk			CONFIG_USB_CLOCK
12774d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1278307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1279307ecb6dSEric Millbrandt				for USB on PSC3
12804d13cbadSwdenk			CONFIG_USB_CONFIG
12814d13cbadSwdenk				for differential drivers: 0x00001000
12824d13cbadSwdenk				for single ended drivers: 0x00005000
1283307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1284307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
12856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1286fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1287fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
12884d13cbadSwdenk
12899ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
12909ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
12919ab4ce22SSimon Glass
1292aa155058SKuo-Jung Su		CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
1293aa155058SKuo-Jung Su		interval for usb hub power-on delay.(minimum 100msec)
1294aa155058SKuo-Jung Su
129516c8d5e7SWolfgang Denk- USB Device:
129616c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
129716c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
129816c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
129911ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
130016c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
130116c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
130216c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
130316c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
130416c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
130516c8d5e7SWolfgang Denk		a Linux host by
130616c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
130716c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
130816c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
130916c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
131016c8d5e7SWolfgang Denk
131116c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
131216c8d5e7SWolfgang Denk			Define this to build a UDC device
131316c8d5e7SWolfgang Denk
131416c8d5e7SWolfgang Denk			CONFIG_USB_TTY
131516c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
131616c8d5e7SWolfgang Denk			talk to the UDC device
131716c8d5e7SWolfgang Denk
1318f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1319f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1320f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1321f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1322f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1323f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1324f9da0f89SVipin KUMAR			speed.
1325f9da0f89SVipin KUMAR
13266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
132716c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
132816c8d5e7SWolfgang Denk			be set to usbtty.
132916c8d5e7SWolfgang Denk
133016c8d5e7SWolfgang Denk			mpc8xx:
13316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
133216c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
13336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
133416c8d5e7SWolfgang Denk
13356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
133616c8d5e7SWolfgang Denk				Derive USB clock from brgclk
13376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
133816c8d5e7SWolfgang Denk
133916c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
134016c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
134116c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
134216c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
134316c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
134416c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
134516c8d5e7SWolfgang Denk
134616c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
134716c8d5e7SWolfgang Denk			Define this string as the name of your company for
134816c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
134916c8d5e7SWolfgang Denk
135016c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
135116c8d5e7SWolfgang Denk			Define this string as the name of your product
135216c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
135316c8d5e7SWolfgang Denk
135416c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
135516c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
135616c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
135716c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
135816c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
135916c8d5e7SWolfgang Denk
136016c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
136116c8d5e7SWolfgang Denk			Define this as the unique Product ID
136216c8d5e7SWolfgang Denk			for your device
136316c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1364c609719bSwdenk
1365d70a560fSIgor Grinberg- ULPI Layer Support:
1366d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1367d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1368d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1369d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1370d70a560fSIgor Grinberg		viewport is supported.
1371d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1372d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
13736d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
13746d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
13756d365ea0SLucas Stach		the appropriate value in Hz.
1376c609719bSwdenk
1377c609719bSwdenk- MMC Support:
1378c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1379c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1380c609719bSwdenk		accessed from the boot prompt by mapping the device
1381c609719bSwdenk		to physical memory similar to flash. Command line is
1382602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1383602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1384c609719bSwdenk
1385afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1386afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1387afb35666SYoshihiro Shimoda
1388afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1389afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1390afb35666SYoshihiro Shimoda
1391afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1392afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1393afb35666SYoshihiro Shimoda
1394b3ba6e94STom Rini- USB Device Firmware Update (DFU) class support:
1395b3ba6e94STom Rini		CONFIG_DFU_FUNCTION
1396b3ba6e94STom Rini		This enables the USB portion of the DFU USB class
1397b3ba6e94STom Rini
1398b3ba6e94STom Rini		CONFIG_CMD_DFU
1399b3ba6e94STom Rini		This enables the command "dfu" which is used to have
1400b3ba6e94STom Rini		U-Boot create a DFU class device via USB.  This command
1401b3ba6e94STom Rini		requires that the "dfu_alt_info" environment variable be
1402b3ba6e94STom Rini		set and define the alt settings to expose to the host.
1403b3ba6e94STom Rini
1404b3ba6e94STom Rini		CONFIG_DFU_MMC
1405b3ba6e94STom Rini		This enables support for exposing (e)MMC devices via DFU.
1406b3ba6e94STom Rini
1407c6631764SPantelis Antoniou		CONFIG_DFU_NAND
1408c6631764SPantelis Antoniou		This enables support for exposing NAND devices via DFU.
1409c6631764SPantelis Antoniou
1410a9479f04SAfzal Mohammed		CONFIG_DFU_RAM
1411a9479f04SAfzal Mohammed		This enables support for exposing RAM via DFU.
1412a9479f04SAfzal Mohammed		Note: DFU spec refer to non-volatile memory usage, but
1413a9479f04SAfzal Mohammed		allow usages beyond the scope of spec - here RAM usage,
1414a9479f04SAfzal Mohammed		one that would help mostly the developer.
1415a9479f04SAfzal Mohammed
1416e7e75c70SHeiko Schocher		CONFIG_SYS_DFU_DATA_BUF_SIZE
1417e7e75c70SHeiko Schocher		Dfu transfer uses a buffer before writing data to the
1418e7e75c70SHeiko Schocher		raw storage device. Make the size (in bytes) of this buffer
1419e7e75c70SHeiko Schocher		configurable. The size of this buffer is also configurable
1420e7e75c70SHeiko Schocher		through the "dfu_bufsiz" environment variable.
1421e7e75c70SHeiko Schocher
1422ea2453d5SPantelis Antoniou		CONFIG_SYS_DFU_MAX_FILE_SIZE
1423ea2453d5SPantelis Antoniou		When updating files rather than the raw storage device,
1424ea2453d5SPantelis Antoniou		we use a static buffer to copy the file into and then write
1425ea2453d5SPantelis Antoniou		the buffer once we've been given the whole file.  Define
1426ea2453d5SPantelis Antoniou		this to the maximum filesize (in bytes) for the buffer.
1427ea2453d5SPantelis Antoniou		Default is 4 MiB if undefined.
1428ea2453d5SPantelis Antoniou
14296705d81eSwdenk- Journaling Flash filesystem support:
14306705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
14316705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
14326705d81eSwdenk		Define these for a default partition on a NAND device
14336705d81eSwdenk
14346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
14356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
14366705d81eSwdenk		Define these for a default partition on a NOR device
14376705d81eSwdenk
14386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
14396705d81eSwdenk		Define this to create an own partition. You have to provide a
14406705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
14416705d81eSwdenk
14426705d81eSwdenk		If you define only one JFFS2 partition you may also want to
14436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
14446705d81eSwdenk		to disable the command chpart. This is the default when you
14456705d81eSwdenk		have not defined a custom partition
14466705d81eSwdenk
1447c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1448c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1449656f4c65SDonggeun Kim
1450656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1451656f4c65SDonggeun Kim		file in FAT formatted partition.
1452656f4c65SDonggeun Kim
1453656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1454656f4c65SDonggeun Kim		user to write files to FAT.
1455c30a15e5SDonggeun Kim
145684cd9327SGabe BlackCBFS (Coreboot Filesystem) support
145784cd9327SGabe Black		CONFIG_CMD_CBFS
145884cd9327SGabe Black
145984cd9327SGabe Black		Define this to enable support for reading from a Coreboot
146084cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
146184cd9327SGabe Black		and cbfsload.
146284cd9327SGabe Black
1463c609719bSwdenk- Keyboard Support:
1464c609719bSwdenk		CONFIG_ISA_KEYBOARD
1465c609719bSwdenk
1466c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1467c609719bSwdenk		support
1468c609719bSwdenk
1469c609719bSwdenk		CONFIG_I8042_KBD
1470c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1471c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1472c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1473c609719bSwdenk		for cfb_console. Supports cursor blinking.
1474c609719bSwdenk
1475713cb680SHung-ying Tyan		CONFIG_CROS_EC_KEYB
1476713cb680SHung-ying Tyan		Enables a Chrome OS keyboard using the CROS_EC interface.
1477713cb680SHung-ying Tyan		This uses CROS_EC to communicate with a second microcontroller
1478713cb680SHung-ying Tyan		which provides key scans on request.
1479713cb680SHung-ying Tyan
1480c609719bSwdenk- Video support:
1481c609719bSwdenk		CONFIG_VIDEO
1482c609719bSwdenk
1483c609719bSwdenk		Define this to enable video support (for output to
1484c609719bSwdenk		video).
1485c609719bSwdenk
1486c609719bSwdenk		CONFIG_VIDEO_CT69000
1487c609719bSwdenk
1488c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1489c609719bSwdenk
1490c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1491eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1492eeb1b77bSwdenk		video output is selected via environment 'videoout'
1493eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1494eeb1b77bSwdenk		assumed.
1495c609719bSwdenk
1496eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
149711ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1498eeb1b77bSwdenk		are possible:
1499eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1500eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1501eeb1b77bSwdenk
1502eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1503eeb1b77bSwdenk		-------------+---------------------------------------------
1504eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1505eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1506eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1507eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1508eeb1b77bSwdenk		-------------+---------------------------------------------
1509c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1510c609719bSwdenk
1511eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
15127817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1513eeb1b77bSwdenk
1514eeb1b77bSwdenk
1515a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1516a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1517a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1518a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1519a6c7ad2fSwdenk
15207d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
15217d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
15227d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
15237d3053fbSTimur Tabi		support, and should also define these other macros:
15247d3053fbSTimur Tabi
15257d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
15267d3053fbSTimur Tabi			CONFIG_VIDEO
15277d3053fbSTimur Tabi			CONFIG_CMD_BMP
15287d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
15297d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
15307d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
15317d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
15327d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
15337d3053fbSTimur Tabi
1534ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1535ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1536ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1537ba8e76bdSTimur Tabi		description of this variable.
15387d3053fbSTimur Tabi
1539058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1540058d59b0SSimon Glass
1541058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1542058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1543058d59b0SSimon Glass		driver.
1544058d59b0SSimon Glass
1545058d59b0SSimon Glass
1546682011ffSwdenk- Keyboard Support:
1547682011ffSwdenk		CONFIG_KEYBOARD
1548682011ffSwdenk
1549682011ffSwdenk		Define this to enable a custom keyboard support.
1550682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1551682011ffSwdenk		defined in your board-specific files.
1552682011ffSwdenk		The only board using this so far is RBC823.
1553a6c7ad2fSwdenk
1554c609719bSwdenk- LCD Support:	CONFIG_LCD
1555c609719bSwdenk
1556c609719bSwdenk		Define this to enable LCD support (for output to LCD
1557c609719bSwdenk		display); also select one of the supported displays
1558c609719bSwdenk		by defining one of these:
1559c609719bSwdenk
156039cf4804SStelian Pop		CONFIG_ATMEL_LCD:
156139cf4804SStelian Pop
156239cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
156339cf4804SStelian Pop
1564fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1565c609719bSwdenk
1566fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1567c609719bSwdenk
1568fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1569c609719bSwdenk
1570fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1571fd3103bbSwdenk			Active, color, single scan.
1572fd3103bbSwdenk
1573fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1574fd3103bbSwdenk
1575fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1576c609719bSwdenk			Active, color, single scan.
1577c609719bSwdenk
1578c609719bSwdenk		CONFIG_SHARP_16x9
1579c609719bSwdenk
1580c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1581c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1582c609719bSwdenk
1583c609719bSwdenk		CONFIG_SHARP_LQ64D341
1584c609719bSwdenk
1585c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1586c609719bSwdenk			Active, color, single scan.
1587c609719bSwdenk
1588c609719bSwdenk		CONFIG_HLD1045
1589c609719bSwdenk
1590c609719bSwdenk			HLD1045 display, 640x480.
1591c609719bSwdenk			Active, color, single scan.
1592c609719bSwdenk
1593c609719bSwdenk		CONFIG_OPTREX_BW
1594c609719bSwdenk
1595c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1596c609719bSwdenk			or
1597c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1598c609719bSwdenk			or
1599c609719bSwdenk			Hitachi	 SP14Q002
1600c609719bSwdenk
1601c609719bSwdenk			320x240. Black & white.
1602c609719bSwdenk
1603c609719bSwdenk		Normally display is black on white background; define
16046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1605c609719bSwdenk
1606676d319eSSimon Glass		CONFIG_LCD_ALIGNMENT
1607676d319eSSimon Glass
1608676d319eSSimon Glass		Normally the LCD is page-aligned (tyically 4KB). If this is
1609676d319eSSimon Glass		defined then the LCD will be aligned to this value instead.
1610676d319eSSimon Glass		For ARM it is sometimes useful to use MMU_SECTION_SIZE
1611676d319eSSimon Glass		here, since it is cheaper to change data cache settings on
1612676d319eSSimon Glass		a per-section basis.
1613676d319eSSimon Glass
16140d89efefSSimon Glass		CONFIG_CONSOLE_SCROLL_LINES
16150d89efefSSimon Glass
16160d89efefSSimon Glass		When the console need to be scrolled, this is the number of
16170d89efefSSimon Glass		lines to scroll by. It defaults to 1. Increasing this makes
16180d89efefSSimon Glass		the console jump but can help speed up operation when scrolling
16190d89efefSSimon Glass		is slow.
1620676d319eSSimon Glass
162145d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
162245d7f525STom Wai-Hong Tam
162345d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
162445d7f525STom Wai-Hong Tam
1625735987c5STom Wai-Hong Tam		CONFIG_I2C_EDID
1626735987c5STom Wai-Hong Tam
1627735987c5STom Wai-Hong Tam		Enables an 'i2c edid' command which can read EDID
1628735987c5STom Wai-Hong Tam		information over I2C from an attached LCD display.
1629735987c5STom Wai-Hong Tam
16307152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1631d791b1dcSwdenk
1632d791b1dcSwdenk		If this option is set, the environment is checked for
1633d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1634d791b1dcSwdenk		of logo, copyright and system information on the LCD
1635e94d2cd9Swdenk		is suppressed and the BMP image at the address
1636d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1637d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1638d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1639d791b1dcSwdenk		loaded very quickly after power-on.
1640d791b1dcSwdenk
1641c0880485SNikita Kiryanov		CONFIG_SPLASHIMAGE_GUARD
1642c0880485SNikita Kiryanov
1643c0880485SNikita Kiryanov		If this option is set, then U-Boot will prevent the environment
1644c0880485SNikita Kiryanov		variable "splashimage" from being set to a problematic address
1645c0880485SNikita Kiryanov		(see README.displaying-bmps and README.arm-unaligned-accesses).
1646c0880485SNikita Kiryanov		This option is useful for targets where, due to alignment
1647c0880485SNikita Kiryanov		restrictions, an improperly aligned BMP image will cause a data
1648c0880485SNikita Kiryanov		abort. If you think you will not have problems with unaligned
1649c0880485SNikita Kiryanov		accesses (for example because your toolchain prevents them)
1650c0880485SNikita Kiryanov		there is no need to set this option.
1651c0880485SNikita Kiryanov
16521ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
16531ca298ceSMatthias Weisser
16541ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
16551ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
16561ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
16571ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
16581ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
16591ca298ceSMatthias Weisser		specify 'm' for centering the image.
16601ca298ceSMatthias Weisser
16611ca298ceSMatthias Weisser		Example:
16621ca298ceSMatthias Weisser		setenv splashpos m,m
16631ca298ceSMatthias Weisser			=> image at center of screen
16641ca298ceSMatthias Weisser
16651ca298ceSMatthias Weisser		setenv splashpos 30,20
16661ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
16671ca298ceSMatthias Weisser
16681ca298ceSMatthias Weisser		setenv splashpos -10,m
16691ca298ceSMatthias Weisser			=> vertically centered image
16701ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
16711ca298ceSMatthias Weisser
167298f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
167398f4a3dfSStefan Roese
167498f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
167598f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
167698f4a3dfSStefan Roese		splashscreen support or the bmp command.
167798f4a3dfSStefan Roese
1678d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1679d5011762SAnatolij Gustschin
1680d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1681d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1682d5011762SAnatolij Gustschin		bmp command.
1683d5011762SAnatolij Gustschin
1684f2b96dfbSLei Wen- Do compresssing for memory range:
1685f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1686f2b96dfbSLei Wen
1687f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1688f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1689f2b96dfbSLei Wen
1690c29fdfc1Swdenk- Compression support:
16918ef70478SKees Cook		CONFIG_GZIP
16928ef70478SKees Cook
16938ef70478SKees Cook		Enabled by default to support gzip compressed images.
16948ef70478SKees Cook
1695c29fdfc1Swdenk		CONFIG_BZIP2
1696c29fdfc1Swdenk
1697c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1698c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1699c29fdfc1Swdenk		compressed images are supported.
1700c29fdfc1Swdenk
1701c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
17026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1703c29fdfc1Swdenk		be at least 4MB.
1704d791b1dcSwdenk
1705fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1706fc9c1727SLuigi 'Comio' Mantellini
1707fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1708fc9c1727SLuigi 'Comio' Mantellini		images is included.
1709fc9c1727SLuigi 'Comio' Mantellini
1710fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1711fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1712fc9c1727SLuigi 'Comio' Mantellini		formula:
1713fc9c1727SLuigi 'Comio' Mantellini
1714fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1715fc9c1727SLuigi 'Comio' Mantellini
1716fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1717fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1718fc9c1727SLuigi 'Comio' Mantellini
1719fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1720fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1721fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1722fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1723fc9c1727SLuigi 'Comio' Mantellini
1724fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1725fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
17266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1727fc9c1727SLuigi 'Comio' Mantellini
17288ef70478SKees Cook		CONFIG_LZO
17298ef70478SKees Cook
17308ef70478SKees Cook		If this option is set, support for LZO compressed images
17318ef70478SKees Cook		is included.
17328ef70478SKees Cook
173317ea1177Swdenk- MII/PHY support:
173417ea1177Swdenk		CONFIG_PHY_ADDR
173517ea1177Swdenk
173617ea1177Swdenk		The address of PHY on MII bus.
173717ea1177Swdenk
173817ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
173917ea1177Swdenk
174017ea1177Swdenk		The clock frequency of the MII bus
174117ea1177Swdenk
174217ea1177Swdenk		CONFIG_PHY_GIGE
174317ea1177Swdenk
174417ea1177Swdenk		If this option is set, support for speed/duplex
174511ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
174617ea1177Swdenk
174717ea1177Swdenk		CONFIG_PHY_RESET_DELAY
174817ea1177Swdenk
174917ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
175017ea1177Swdenk		reset before any MII register access is possible.
175117ea1177Swdenk		For such PHY, set this option to the usec delay
175217ea1177Swdenk		required. (minimum 300usec for LXT971A)
175317ea1177Swdenk
175417ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
175517ea1177Swdenk
175617ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
175717ea1177Swdenk		command issued before MII status register can be read
175817ea1177Swdenk
1759c609719bSwdenk- Ethernet address:
1760c609719bSwdenk		CONFIG_ETHADDR
1761c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1762c609719bSwdenk		CONFIG_ETH2ADDR
1763c609719bSwdenk		CONFIG_ETH3ADDR
1764c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1765c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1766c609719bSwdenk
176711ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
176811ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1769c609719bSwdenk		is not determined automatically.
1770c609719bSwdenk
1771c609719bSwdenk- IP address:
1772c609719bSwdenk		CONFIG_IPADDR
1773c609719bSwdenk
1774c609719bSwdenk		Define a default value for the IP address to use for
177511ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1776c609719bSwdenk		determined through e.g. bootp.
17771ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1778c609719bSwdenk
1779c609719bSwdenk- Server IP address:
1780c609719bSwdenk		CONFIG_SERVERIP
1781c609719bSwdenk
1782c609719bSwdenk		Defines a default value for the IP address of a TFTP
1783c609719bSwdenk		server to contact when using the "tftboot" command.
17841ebcd654SWolfgang Denk		(Environment variable "serverip")
1785c609719bSwdenk
178697cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
178797cfe861SRobin Getz
178897cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
178997cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
179097cfe861SRobin Getz
17911ebcd654SWolfgang Denk- Gateway IP address:
17921ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
17931ebcd654SWolfgang Denk
17941ebcd654SWolfgang Denk		Defines a default value for the IP address of the
17951ebcd654SWolfgang Denk		default router where packets to other networks are
17961ebcd654SWolfgang Denk		sent to.
17971ebcd654SWolfgang Denk		(Environment variable "gatewayip")
17981ebcd654SWolfgang Denk
17991ebcd654SWolfgang Denk- Subnet mask:
18001ebcd654SWolfgang Denk		CONFIG_NETMASK
18011ebcd654SWolfgang Denk
18021ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
18031ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
18041ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
18051ebcd654SWolfgang Denk		forwarded through a router.
18061ebcd654SWolfgang Denk		(Environment variable "netmask")
18071ebcd654SWolfgang Denk
180853a5c424SDavid Updegraff- Multicast TFTP Mode:
180953a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
181053a5c424SDavid Updegraff
181153a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
181253a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
181311ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
181453a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
181553a5c424SDavid Updegraff		multicast group.
181653a5c424SDavid Updegraff
1817c609719bSwdenk- BOOTP Recovery Mode:
1818c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1819c609719bSwdenk
1820c609719bSwdenk		If you have many targets in a network that try to
1821c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1822c609719bSwdenk		systems send out BOOTP requests at precisely the same
1823c609719bSwdenk		moment (which would happen for instance at recovery
1824c609719bSwdenk		from a power failure, when all systems will try to
1825c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1826c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1827c609719bSwdenk		inserted before sending out BOOTP requests. The
18286c33c785SWolfgang Denk		following delays are inserted then:
1829c609719bSwdenk
1830c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1831c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1832c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1833c609719bSwdenk		4th and following
1834c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1835c609719bSwdenk
1836fe389a82Sstroese- DHCP Advanced Options:
18371fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
18381fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1839fe389a82Sstroese
18401fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
18411fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
18421fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
18431fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
18441fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
18451fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
18461fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
18471fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
18481fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
18491fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
18501fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
18511fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
18522c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1853fe389a82Sstroese
18545d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
18555d110f0aSWilson Callan		environment variable, not the BOOTP server.
1856fe389a82Sstroese
18572c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
18582c00e099SJoe Hershberger		after the configured retry count, the call will fail
18592c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
18602c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
18612c00e099SJoe Hershberger		is not available.
18622c00e099SJoe Hershberger
1863fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1864fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1865fe389a82Sstroese		than one DNS serverip is offered to the client.
1866fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1867fe389a82Sstroese		serverip will be stored in the additional environment
1868fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1869fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
18701fe80d79SJon Loeliger		is defined.
1871fe389a82Sstroese
1872fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1873fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1874fe389a82Sstroese		need the hostname of the DHCP requester.
18755d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
18761fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
18771fe80d79SJon Loeliger		option 12 to the DHCP server.
1878fe389a82Sstroese
1879d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1880d9a2f416SAras Vaichas
1881d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1882d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1883d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1884d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1885d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1886d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1887d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1888d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1889d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1890d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1891d9a2f416SAras Vaichas		this delay.
1892d9a2f416SAras Vaichas
1893d22c338eSJoe Hershberger - Link-local IP address negotiation:
1894d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1895d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1896d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1897d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1898d22c338eSJoe Hershberger
1899d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1900d22c338eSJoe Hershberger
1901a3d991bdSwdenk - CDP Options:
1902a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1903a3d991bdSwdenk
1904a3d991bdSwdenk		The device id used in CDP trigger frames.
1905a3d991bdSwdenk
1906a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1907a3d991bdSwdenk
1908a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1909a3d991bdSwdenk		of the device.
1910a3d991bdSwdenk
1911a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1912a3d991bdSwdenk
1913a3d991bdSwdenk		A printf format string which contains the ascii name of
1914a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
191511ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1916a3d991bdSwdenk
1917a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1918a3d991bdSwdenk
1919a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1920a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1921a3d991bdSwdenk
1922a3d991bdSwdenk		CONFIG_CDP_VERSION
1923a3d991bdSwdenk
1924a3d991bdSwdenk		An ascii string containing the version of the software.
1925a3d991bdSwdenk
1926a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1927a3d991bdSwdenk
1928a3d991bdSwdenk		An ascii string containing the name of the platform.
1929a3d991bdSwdenk
1930a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1931a3d991bdSwdenk
1932a3d991bdSwdenk		A 32bit integer sent on the trigger.
1933a3d991bdSwdenk
1934a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1935a3d991bdSwdenk
1936a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1937a3d991bdSwdenk		device in .1 of milliwatts.
1938a3d991bdSwdenk
1939a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1940a3d991bdSwdenk
1941a3d991bdSwdenk		A byte containing the id of the VLAN.
1942a3d991bdSwdenk
1943c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1944c609719bSwdenk
1945c609719bSwdenk		Several configurations allow to display the current
1946c609719bSwdenk		status using a LED. For instance, the LED will blink
1947c609719bSwdenk		fast while running U-Boot code, stop blinking as
1948c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1949c609719bSwdenk		start blinking slow once the Linux kernel is running
1950c609719bSwdenk		(supported by a status LED driver in the Linux
1951c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1952c609719bSwdenk		feature in U-Boot.
1953c609719bSwdenk
1954c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1955c609719bSwdenk
1956c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1957c609719bSwdenk		on those systems that support this (optional)
1958c609719bSwdenk		feature, like the TQM8xxL modules.
1959c609719bSwdenk
19603f4978c7SHeiko Schocher- I2C Support:	CONFIG_SYS_I2C
1961c609719bSwdenk
19623f4978c7SHeiko Schocher		This enable the NEW i2c subsystem, and will allow you to use
19633f4978c7SHeiko Schocher		i2c commands at the u-boot command line (as long as you set
19643f4978c7SHeiko Schocher		CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
19653f4978c7SHeiko Schocher		based realtime clock chips or other i2c devices. See
19663f4978c7SHeiko Schocher		common/cmd_i2c.c for a description of the command line
19673f4978c7SHeiko Schocher		interface.
19683f4978c7SHeiko Schocher
19693f4978c7SHeiko Schocher		ported i2c driver to the new framework:
1970ea818dbbSHeiko Schocher		- drivers/i2c/soft_i2c.c:
1971ea818dbbSHeiko Schocher		  - activate first bus with CONFIG_SYS_I2C_SOFT define
1972ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
1973ea818dbbSHeiko Schocher		    for defining speed and slave address
1974ea818dbbSHeiko Schocher		  - activate second bus with I2C_SOFT_DECLARATIONS2 define
1975ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
1976ea818dbbSHeiko Schocher		    for defining speed and slave address
1977ea818dbbSHeiko Schocher		  - activate third bus with I2C_SOFT_DECLARATIONS3 define
1978ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
1979ea818dbbSHeiko Schocher		    for defining speed and slave address
1980ea818dbbSHeiko Schocher		  - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
1981ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
1982ea818dbbSHeiko Schocher		    for defining speed and slave address
19833f4978c7SHeiko Schocher
198400f792e0SHeiko Schocher		- drivers/i2c/fsl_i2c.c:
198500f792e0SHeiko Schocher		  - activate i2c driver with CONFIG_SYS_I2C_FSL
198600f792e0SHeiko Schocher		    define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
198700f792e0SHeiko Schocher		    offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
198800f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
198900f792e0SHeiko Schocher		    bus.
199000f792e0SHeiko Schocher		  - If your board supports a second fsl i2c bus, define
199100f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
199200f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SPEED for the speed and
199300f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
199400f792e0SHeiko Schocher		    second bus.
199500f792e0SHeiko Schocher
19961f2ba722SSimon Glass		- drivers/i2c/tegra_i2c.c:
19971f2ba722SSimon Glass		 - activate this driver with CONFIG_SYS_I2C_TEGRA
19981f2ba722SSimon Glass		 - This driver adds 4 i2c buses with a fix speed from
19991f2ba722SSimon Glass		   100000 and the slave addr 0!
20001f2ba722SSimon Glass
2001880540deSDirk Eibach		- drivers/i2c/ppc4xx_i2c.c
2002880540deSDirk Eibach		  - activate this driver with CONFIG_SYS_I2C_PPC4XX
2003880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
2004880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
2005880540deSDirk Eibach
2006fac96408Strem		- drivers/i2c/i2c_mxc.c
2007fac96408Strem		  - activate this driver with CONFIG_SYS_I2C_MXC
2008fac96408Strem		  - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED
2009fac96408Strem		  - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE
2010fac96408Strem		  - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED
2011fac96408Strem		  - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE
2012fac96408Strem		  - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED
2013fac96408Strem		  - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
2014fac96408Strem		If thoses defines are not set, default value is 100000
2015fac96408Strem		for speed, and 0 for slave.
2016fac96408Strem
2017*1086bfa9SNobuhiro Iwamatsu		- drivers/i2c/rcar_i2c.c:
2018*1086bfa9SNobuhiro Iwamatsu		  - activate this driver with CONFIG_SYS_I2C_RCAR
2019*1086bfa9SNobuhiro Iwamatsu		  - This driver adds 4 i2c buses
2020*1086bfa9SNobuhiro Iwamatsu
2021*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0
2022*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0
2023*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1
2024*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1
2025*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2
2026*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2
2027*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3
2028*1086bfa9SNobuhiro Iwamatsu		  - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3
2029*1086bfa9SNobuhiro Iwamatsu		  - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses
2030*1086bfa9SNobuhiro Iwamatsu
20313f4978c7SHeiko Schocher		additional defines:
20323f4978c7SHeiko Schocher
20333f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES
20343f4978c7SHeiko Schocher		Hold the number of i2c busses you want to use. If you
20353f4978c7SHeiko Schocher		don't use/have i2c muxes on your i2c bus, this
20363f4978c7SHeiko Schocher		is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
20373f4978c7SHeiko Schocher		omit this define.
20383f4978c7SHeiko Schocher
20393f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS
20403f4978c7SHeiko Schocher		define this, if you don't use i2c muxes on your hardware.
20413f4978c7SHeiko Schocher		if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
20423f4978c7SHeiko Schocher		omit this define.
20433f4978c7SHeiko Schocher
20443f4978c7SHeiko Schocher		CONFIG_SYS_I2C_MAX_HOPS
20453f4978c7SHeiko Schocher		define how many muxes are maximal consecutively connected
20463f4978c7SHeiko Schocher		on one i2c bus. If you not use i2c muxes, omit this
20473f4978c7SHeiko Schocher		define.
20483f4978c7SHeiko Schocher
20493f4978c7SHeiko Schocher		CONFIG_SYS_I2C_BUSES
20503f4978c7SHeiko Schocher		hold a list of busses you want to use, only used if
20513f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
20523f4978c7SHeiko Schocher		a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
20533f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES = 9:
20543f4978c7SHeiko Schocher
20553f4978c7SHeiko Schocher		 CONFIG_SYS_I2C_BUSES	{{0, {I2C_NULL_HOP}}, \
20563f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
20573f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
20583f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
20593f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
20603f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
20613f4978c7SHeiko Schocher					{1, {I2C_NULL_HOP}}, \
20623f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
20633f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
20643f4978c7SHeiko Schocher					}
20653f4978c7SHeiko Schocher
20663f4978c7SHeiko Schocher		which defines
20673f4978c7SHeiko Schocher			bus 0 on adapter 0 without a mux
2068ea818dbbSHeiko Schocher			bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
2069ea818dbbSHeiko Schocher			bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
2070ea818dbbSHeiko Schocher			bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
2071ea818dbbSHeiko Schocher			bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
2072ea818dbbSHeiko Schocher			bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
20733f4978c7SHeiko Schocher			bus 6 on adapter 1 without a mux
2074ea818dbbSHeiko Schocher			bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
2075ea818dbbSHeiko Schocher			bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
20763f4978c7SHeiko Schocher
20773f4978c7SHeiko Schocher		If you do not have i2c muxes on your board, omit this define.
20783f4978c7SHeiko Schocher
2079ea818dbbSHeiko Schocher- Legacy I2C Support:	CONFIG_HARD_I2C
20803f4978c7SHeiko Schocher
20813f4978c7SHeiko Schocher		NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
20823f4978c7SHeiko Schocher		provides the following compelling advantages:
20833f4978c7SHeiko Schocher
20843f4978c7SHeiko Schocher		- more than one i2c adapter is usable
20853f4978c7SHeiko Schocher		- approved multibus support
20863f4978c7SHeiko Schocher		- better i2c mux support
20873f4978c7SHeiko Schocher
20883f4978c7SHeiko Schocher		** Please consider updating your I2C driver now. **
20893f4978c7SHeiko Schocher
2090ea818dbbSHeiko Schocher		These enable legacy I2C serial bus commands. Defining
2091ea818dbbSHeiko Schocher		CONFIG_HARD_I2C will include the appropriate I2C driver
2092ea818dbbSHeiko Schocher		for the selected CPU.
2093c609719bSwdenk
2094b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
2095602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
2096b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
2097b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
2098c609719bSwdenk		command line interface.
2099c609719bSwdenk
2100bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
2101c609719bSwdenk
2102b37c7e5eSwdenk		There are several other quantities that must also be
2103ea818dbbSHeiko Schocher		defined when you define CONFIG_HARD_I2C.
2104c609719bSwdenk
21056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
2106b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
21076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
210811ccc33fSMarcel Ziswiler		the CPU's i2c node address).
2109c609719bSwdenk
21108d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
2111a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
21128d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
21138d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
21148d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
2115b37c7e5eSwdenk
21165da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
21175da71efaSEric Millbrandt
21185da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
21195da71efaSEric Millbrandt		chips might think that the current transfer is still
21205da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
21215da71efaSEric Millbrandt		commands until the slave device responds.
21225da71efaSEric Millbrandt
2123b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
2124b37c7e5eSwdenk
2125ea818dbbSHeiko Schocher		If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
2126b37c7e5eSwdenk		then the following macros need to be defined (examples are
2127b37c7e5eSwdenk		from include/configs/lwmon.h):
2128c609719bSwdenk
2129c609719bSwdenk		I2C_INIT
2130c609719bSwdenk
2131b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
2132c609719bSwdenk		controller or configure ports.
2133c609719bSwdenk
2134b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
2135b37c7e5eSwdenk
2136c609719bSwdenk		I2C_PORT
2137c609719bSwdenk
2138c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
2139c609719bSwdenk		assumes both bits are on the same port). Valid values
2140c609719bSwdenk		are 0..3 for ports A..D.
2141c609719bSwdenk
2142c609719bSwdenk		I2C_ACTIVE
2143c609719bSwdenk
2144c609719bSwdenk		The code necessary to make the I2C data line active
2145c609719bSwdenk		(driven).  If the data line is open collector, this
2146c609719bSwdenk		define can be null.
2147c609719bSwdenk
2148b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
2149b37c7e5eSwdenk
2150c609719bSwdenk		I2C_TRISTATE
2151c609719bSwdenk
2152c609719bSwdenk		The code necessary to make the I2C data line tri-stated
2153c609719bSwdenk		(inactive).  If the data line is open collector, this
2154c609719bSwdenk		define can be null.
2155c609719bSwdenk
2156b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2157b37c7e5eSwdenk
2158c609719bSwdenk		I2C_READ
2159c609719bSwdenk
2160472d5460SYork Sun		Code that returns true if the I2C data line is high,
2161472d5460SYork Sun		false if it is low.
2162c609719bSwdenk
2163b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2164b37c7e5eSwdenk
2165c609719bSwdenk		I2C_SDA(bit)
2166c609719bSwdenk
2167472d5460SYork Sun		If <bit> is true, sets the I2C data line high. If it
2168472d5460SYork Sun		is false, it clears it (low).
2169c609719bSwdenk
2170b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
2171b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
2172b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
2173b37c7e5eSwdenk
2174c609719bSwdenk		I2C_SCL(bit)
2175c609719bSwdenk
2176472d5460SYork Sun		If <bit> is true, sets the I2C clock line high. If it
2177472d5460SYork Sun		is false, it clears it (low).
2178c609719bSwdenk
2179b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
2180b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
2181b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
2182b37c7e5eSwdenk
2183c609719bSwdenk		I2C_DELAY
2184c609719bSwdenk
2185c609719bSwdenk		This delay is invoked four times per clock cycle so this
2186c609719bSwdenk		controls the rate of data transfer.  The data rate thus
2187b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
2188b37c7e5eSwdenk		like:
2189b37c7e5eSwdenk
2190b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
2191c609719bSwdenk
2192793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2193793b5726SMike Frysinger
2194793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
2195793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
2196793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
2197793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
2198793b5726SMike Frysinger
2199793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
2200793b5726SMike Frysinger		the generic GPIO functions.
2201793b5726SMike Frysinger
22026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
220347cd00faSwdenk
220447cd00faSwdenk		When a board is reset during an i2c bus transfer
220547cd00faSwdenk		chips might think that the current transfer is still
220647cd00faSwdenk		in progress. On some boards it is possible to access
220747cd00faSwdenk		the i2c SCLK line directly, either by using the
220847cd00faSwdenk		processor pin as a GPIO or by having a second pin
220947cd00faSwdenk		connected to the bus. If this option is defined a
221047cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
221147cd00faSwdenk		is run early in the boot sequence.
221247cd00faSwdenk
221326a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
221426a33504SRichard Retanubun
221526a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
221626a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
221726a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
221826a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
221926a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
222026a33504SRichard Retanubun		controller provide such a method. It is called at the end of
222126a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
222226a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
222326a33504SRichard Retanubun
222417ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
222517ea1177Swdenk
222617ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
222717ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
222817ea1177Swdenk		variable "i2cfast". (see also i2cfast)
222917ea1177Swdenk
2230bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
2231bb99ad6dSBen Warren
2232bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
2233bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
2234bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
2235bb99ad6dSBen Warren		Note that bus numbering is zero-based.
2236bb99ad6dSBen Warren
22376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
2238bb99ad6dSBen Warren
2239bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
22400f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
22410f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
22420f89c54bSPeter Tyser		a 1D array of device addresses
2243bb99ad6dSBen Warren
2244bb99ad6dSBen Warren		e.g.
2245bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
22466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2247bb99ad6dSBen Warren
2248bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
2249bb99ad6dSBen Warren
2250bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
22516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
2252bb99ad6dSBen Warren
2253bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2254bb99ad6dSBen Warren
22556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
2256be5e6181STimur Tabi
2257be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
2258be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2259be5e6181STimur Tabi
22606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
22610dc018ecSStefan Roese
22620dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
22630dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
22640dc018ecSStefan Roese
22656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
22660dc018ecSStefan Roese
22670dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
22680dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
22690dc018ecSStefan Roese
22706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
22719ebbb54fSVictor Gallardo
22729ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
22739ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
22749ebbb54fSVictor Gallardo		specified DTT device.
22759ebbb54fSVictor Gallardo
22762ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
22772ac6985aSAndrew Dyer
22782ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
22792ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
22802ac6985aSAndrew Dyer		between writing the address pointer and reading the
22812ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
22822ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
22832ac6985aSAndrew Dyer		devices can use either method, but some require one or
22842ac6985aSAndrew Dyer		the other.
2285be5e6181STimur Tabi
2286c609719bSwdenk- SPI Support:	CONFIG_SPI
2287c609719bSwdenk
2288c609719bSwdenk		Enables SPI driver (so far only tested with
2289c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2290c609719bSwdenk		D/As on the SACSng board)
2291c609719bSwdenk
22926639562eSYoshihiro Shimoda		CONFIG_SH_SPI
22936639562eSYoshihiro Shimoda
22946639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
22956639562eSYoshihiro Shimoda		only SH7757 is supported.
22966639562eSYoshihiro Shimoda
2297c609719bSwdenk		CONFIG_SPI_X
2298c609719bSwdenk
2299c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2300c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2301c609719bSwdenk
2302c609719bSwdenk		CONFIG_SOFT_SPI
2303c609719bSwdenk
2304c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2305c609719bSwdenk		using hardware support. This is a general purpose
2306c609719bSwdenk		driver that only requires three general I/O port pins
2307c609719bSwdenk		(two outputs, one input) to function. If this is
2308c609719bSwdenk		defined, the board configuration must define several
2309c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2310c609719bSwdenk		an example, see include/configs/sacsng.h.
2311c609719bSwdenk
231204a9e118SBen Warren		CONFIG_HARD_SPI
231304a9e118SBen Warren
231404a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
231504a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
231604a9e118SBen Warren		must define a list of chip-select function pointers.
231704a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
231804a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
231904a9e118SBen Warren
232038254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
232138254f45SGuennadi Liakhovetski
232238254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
23232e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
232438254f45SGuennadi Liakhovetski
23250133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
23260133502eSMatthias Fuchs
23270133502eSMatthias Fuchs		Enables FPGA subsystem.
23280133502eSMatthias Fuchs
23290133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
23300133502eSMatthias Fuchs
23310133502eSMatthias Fuchs		Enables support for specific chip vendors.
23320133502eSMatthias Fuchs		(ALTERA, XILINX)
23330133502eSMatthias Fuchs
23340133502eSMatthias Fuchs		CONFIG_FPGA_<family>
23350133502eSMatthias Fuchs
23360133502eSMatthias Fuchs		Enables support for FPGA family.
23370133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
23380133502eSMatthias Fuchs
23390133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2340c609719bSwdenk
2341c609719bSwdenk		Specify the number of FPGA devices to support.
2342c609719bSwdenk
23436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2344c609719bSwdenk
2345c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2346c609719bSwdenk
23476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2348c609719bSwdenk
2349c609719bSwdenk		Enable checks on FPGA configuration interface busy
2350c609719bSwdenk		status by the configuration function. This option
2351c609719bSwdenk		will require a board or device specific function to
2352c609719bSwdenk		be written.
2353c609719bSwdenk
2354c609719bSwdenk		CONFIG_FPGA_DELAY
2355c609719bSwdenk
2356c609719bSwdenk		If defined, a function that provides delays in the FPGA
2357c609719bSwdenk		configuration driver.
2358c609719bSwdenk
23596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2360c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2361c609719bSwdenk
23626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2363c609719bSwdenk
2364c609719bSwdenk		Check for configuration errors during FPGA bitfile
2365c609719bSwdenk		loading. For example, abort during Virtex II
2366c609719bSwdenk		configuration if the INIT_B line goes low (which
2367c609719bSwdenk		indicated a CRC error).
2368c609719bSwdenk
23696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2370c609719bSwdenk
2371c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2372c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2373c609719bSwdenk		FPGA configuration sequence. The default time is 500
237411ccc33fSMarcel Ziswiler		ms.
2375c609719bSwdenk
23766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2377c609719bSwdenk
2378c609719bSwdenk		Maximum time to wait for BUSY to deassert during
237911ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2380c609719bSwdenk
23816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2382c609719bSwdenk
2383c609719bSwdenk		Time to wait after FPGA configuration. The default is
238411ccc33fSMarcel Ziswiler		200 ms.
2385c609719bSwdenk
2386c609719bSwdenk- Configuration Management:
2387c609719bSwdenk		CONFIG_IDENT_STRING
2388c609719bSwdenk
2389c609719bSwdenk		If defined, this string will be added to the U-Boot
2390c609719bSwdenk		version information (U_BOOT_VERSION)
2391c609719bSwdenk
2392c609719bSwdenk- Vendor Parameter Protection:
2393c609719bSwdenk
2394c609719bSwdenk		U-Boot considers the values of the environment
2395c609719bSwdenk		variables "serial#" (Board Serial Number) and
23967152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2397c609719bSwdenk		are set once by the board vendor / manufacturer, and
2398c609719bSwdenk		protects these variables from casual modification by
2399c609719bSwdenk		the user. Once set, these variables are read-only,
2400c609719bSwdenk		and write or delete attempts are rejected. You can
240111ccc33fSMarcel Ziswiler		change this behaviour:
2402c609719bSwdenk
2403c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2404c609719bSwdenk		file, the write protection for vendor parameters is
240547cd00faSwdenk		completely disabled. Anybody can change or delete
2406c609719bSwdenk		these parameters.
2407c609719bSwdenk
2408c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2409c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
241011ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2411c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2412c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2413c609719bSwdenk		read-only.]
2414c609719bSwdenk
24152598090bSJoe Hershberger		The same can be accomplished in a more flexible way
24162598090bSJoe Hershberger		for any variable by configuring the type of access
24172598090bSJoe Hershberger		to allow for those variables in the ".flags" variable
24182598090bSJoe Hershberger		or define CONFIG_ENV_FLAGS_LIST_STATIC.
24192598090bSJoe Hershberger
2420c609719bSwdenk- Protected RAM:
2421c609719bSwdenk		CONFIG_PRAM
2422c609719bSwdenk
2423c609719bSwdenk		Define this variable to enable the reservation of
2424c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2425c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2426c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2427c609719bSwdenk		this default value by defining an environment
2428c609719bSwdenk		variable "pram" to the number of kB you want to
2429c609719bSwdenk		reserve. Note that the board info structure will
2430c609719bSwdenk		still show the full amount of RAM. If pRAM is
2431c609719bSwdenk		reserved, a new environment variable "mem" will
2432c609719bSwdenk		automatically be defined to hold the amount of
2433c609719bSwdenk		remaining RAM in a form that can be passed as boot
2434c609719bSwdenk		argument to Linux, for instance like that:
2435c609719bSwdenk
2436fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2437c609719bSwdenk			saveenv
2438c609719bSwdenk
2439c609719bSwdenk		This way you can tell Linux not to use this memory,
2440c609719bSwdenk		either, which results in a memory region that will
2441c609719bSwdenk		not be affected by reboots.
2442c609719bSwdenk
2443c609719bSwdenk		*WARNING* If your board configuration uses automatic
2444c609719bSwdenk		detection of the RAM size, you must make sure that
2445c609719bSwdenk		this memory test is non-destructive. So far, the
2446c609719bSwdenk		following board configurations are known to be
2447c609719bSwdenk		"pRAM-clean":
2448c609719bSwdenk
24491b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
24501b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2451544d97e9SWolfgang Denk			FLAGADM, TQM8260
2452c609719bSwdenk
245340fef049SGabe Black- Access to physical memory region (> 4GB)
245440fef049SGabe Black		Some basic support is provided for operations on memory not
245540fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
245640fef049SGabe Black		support access to more than 4GB of memory on 32-bit
245740fef049SGabe Black		machines using physical address extension or similar.
245840fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
245940fef049SGabe Black		currently only supports clearing the memory.
246040fef049SGabe Black
2461c609719bSwdenk- Error Recovery:
2462c609719bSwdenk		CONFIG_PANIC_HANG
2463c609719bSwdenk
2464c609719bSwdenk		Define this variable to stop the system in case of a
2465c609719bSwdenk		fatal error, so that you have to reset it manually.
2466c609719bSwdenk		This is probably NOT a good idea for an embedded
246711ccc33fSMarcel Ziswiler		system where you want the system to reboot
2468c609719bSwdenk		automatically as fast as possible, but it may be
2469c609719bSwdenk		useful during development since you can try to debug
2470c609719bSwdenk		the conditions that lead to the situation.
2471c609719bSwdenk
2472c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2473c609719bSwdenk
2474c609719bSwdenk		This variable defines the number of retries for
2475c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2476c609719bSwdenk		before giving up the operation. If not defined, a
2477c609719bSwdenk		default value of 5 is used.
2478c609719bSwdenk
247940cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
248040cb90eeSGuennadi Liakhovetski
248140cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
248240cb90eeSGuennadi Liakhovetski
248348a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
248448a3e999STetsuyuki Kobayashi
248548a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
248648a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
248748a3e999STetsuyuki Kobayashi		try longer timeout such as
248848a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
248948a3e999STetsuyuki Kobayashi
2490c609719bSwdenk- Command Interpreter:
24918078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
249204a85b3bSwdenk
249304a85b3bSwdenk		Enable auto completion of commands using TAB.
249404a85b3bSwdenk
24958078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
24968078f1a5SWolfgang Denk		for the "hush" shell.
24978078f1a5SWolfgang Denk
24988078f1a5SWolfgang Denk
24996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2500c609719bSwdenk
2501c609719bSwdenk		Define this variable to enable the "hush" shell (from
2502c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2503c609719bSwdenk		powerful command line syntax like
2504c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2505c609719bSwdenk		constructs ("shell scripts").
2506c609719bSwdenk
2507c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2508c609719bSwdenk		with a somewhat smaller memory footprint.
2509c609719bSwdenk
2510c609719bSwdenk
25116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2512c609719bSwdenk
2513c609719bSwdenk		This defines the secondary prompt string, which is
2514c609719bSwdenk		printed when the command interpreter needs more input
2515c609719bSwdenk		to complete a command. Usually "> ".
2516c609719bSwdenk
2517c609719bSwdenk	Note:
2518c609719bSwdenk
2519c609719bSwdenk		In the current implementation, the local variables
2520c609719bSwdenk		space and global environment variables space are
2521c609719bSwdenk		separated. Local variables are those you define by
25223b57fe0aSwdenk		simply typing `name=value'. To access a local
2523c609719bSwdenk		variable later on, you have write `$name' or
25243b57fe0aSwdenk		`${name}'; to execute the contents of a variable
25253b57fe0aSwdenk		directly type `$name' at the command prompt.
2526c609719bSwdenk
2527c609719bSwdenk		Global environment variables are those you use
2528c609719bSwdenk		setenv/printenv to work with. To run a command stored
2529c609719bSwdenk		in such a variable, you need to use the run command,
2530c609719bSwdenk		and you must not use the '$' sign to access them.
2531c609719bSwdenk
2532c609719bSwdenk		To store commands and special characters in a
2533c609719bSwdenk		variable, please use double quotation marks
2534c609719bSwdenk		surrounding the whole text of the variable, instead
2535c609719bSwdenk		of the backslashes before semicolons and special
2536c609719bSwdenk		symbols.
2537c609719bSwdenk
2538aa0c71acSWolfgang Denk- Commandline Editing and History:
2539aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2540aa0c71acSWolfgang Denk
254111ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2542aa0c71acSWolfgang Denk		commandline input operations
2543aa0c71acSWolfgang Denk
2544a8c7c708Swdenk- Default Environment:
2545c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2546c609719bSwdenk
2547c609719bSwdenk		Define this to contain any number of null terminated
2548c609719bSwdenk		strings (variable = value pairs) that will be part of
25497152b1d0Swdenk		the default environment compiled into the boot image.
25502262cfeeSwdenk
2551c609719bSwdenk		For example, place something like this in your
2552c609719bSwdenk		board's config file:
2553c609719bSwdenk
2554c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2555c609719bSwdenk			"myvar1=value1\0" \
2556c609719bSwdenk			"myvar2=value2\0"
2557c609719bSwdenk
2558c609719bSwdenk		Warning: This method is based on knowledge about the
2559c609719bSwdenk		internal format how the environment is stored by the
25602262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2561c609719bSwdenk		interface! Although it is unlikely that this format
25627152b1d0Swdenk		will change soon, there is no guarantee either.
2563c609719bSwdenk		You better know what you are doing here.
2564c609719bSwdenk
2565c609719bSwdenk		Note: overly (ab)use of the default environment is
2566c609719bSwdenk		discouraged. Make sure to check other ways to preset
256774de7aefSWolfgang Denk		the environment like the "source" command or the
2568c609719bSwdenk		boot command first.
2569c609719bSwdenk
25705e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
25715e724ca2SStephen Warren
25725e724ca2SStephen Warren		Define this in order to add variables describing the
25735e724ca2SStephen Warren		U-Boot build configuration to the default environment.
25745e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
25755e724ca2SStephen Warren
25765e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
25775e724ca2SStephen Warren
25785e724ca2SStephen Warren		- CONFIG_SYS_ARCH
25795e724ca2SStephen Warren		- CONFIG_SYS_CPU
25805e724ca2SStephen Warren		- CONFIG_SYS_BOARD
25815e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
25825e724ca2SStephen Warren		- CONFIG_SYS_SOC
25835e724ca2SStephen Warren
25847e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
25857e27f89fSTom Rini
25867e27f89fSTom Rini		Define this in order to add variables describing certain
25877e27f89fSTom Rini		run-time determined information about the hardware to the
25887e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
25897e27f89fSTom Rini
259006fd8538SSimon Glass		CONFIG_DELAY_ENVIRONMENT
259106fd8538SSimon Glass
259206fd8538SSimon Glass		Normally the environment is loaded when the board is
259306fd8538SSimon Glass		intialised so that it is available to U-Boot. This inhibits
259406fd8538SSimon Glass		that so that the environment is not available until
259506fd8538SSimon Glass		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
259606fd8538SSimon Glass		this is instead controlled by the value of
259706fd8538SSimon Glass		/config/load-environment.
259806fd8538SSimon Glass
2599a8c7c708Swdenk- DataFlash Support:
26002abbe075Swdenk		CONFIG_HAS_DATAFLASH
26012abbe075Swdenk
26022abbe075Swdenk		Defining this option enables DataFlash features and
26032abbe075Swdenk		allows to read/write in Dataflash via the standard
26042abbe075Swdenk		commands cp, md...
26052abbe075Swdenk
2606f61ec45eSEric Nelson- Serial Flash support
2607f61ec45eSEric Nelson		CONFIG_CMD_SF
2608f61ec45eSEric Nelson
2609f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2610f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2611f61ec45eSEric Nelson
2612f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2613f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2614f61ec45eSEric Nelson		commands.
2615f61ec45eSEric Nelson
2616f61ec45eSEric Nelson		The following defaults may be provided by the platform
2617f61ec45eSEric Nelson		to handle the common case when only a single serial
2618f61ec45eSEric Nelson		flash is present on the system.
2619f61ec45eSEric Nelson
2620f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2621f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2622f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2623f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2624f61ec45eSEric Nelson
262524007273SSimon Glass		CONFIG_CMD_SF_TEST
262624007273SSimon Glass
262724007273SSimon Glass		Define this option to include a destructive SPI flash
262824007273SSimon Glass		test ('sf test').
262924007273SSimon Glass
26301dcd6d03SJagannadha Sutradharudu Teki		CONFIG_SPI_FLASH_BAR		Ban/Extended Addr Reg
26311dcd6d03SJagannadha Sutradharudu Teki
26321dcd6d03SJagannadha Sutradharudu Teki		Define this option to use the Bank addr/Extended addr
26331dcd6d03SJagannadha Sutradharudu Teki		support on SPI flashes which has size > 16Mbytes.
26341dcd6d03SJagannadha Sutradharudu Teki
26353f85ce27Swdenk- SystemACE Support:
26363f85ce27Swdenk		CONFIG_SYSTEMACE
26373f85ce27Swdenk
26383f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
26393f85ce27Swdenk		chips attached via some sort of local bus. The address
264011ccc33fSMarcel Ziswiler		of the chip must also be defined in the
26416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
26423f85ce27Swdenk
26433f85ce27Swdenk		#define CONFIG_SYSTEMACE
26446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
26453f85ce27Swdenk
26463f85ce27Swdenk		When SystemACE support is added, the "ace" device type
26473f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
26483f85ce27Swdenk
2649ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2650ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2651ecb0ccd9SWolfgang Denk
265228cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2653ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
265428cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2655ecb0ccd9SWolfgang Denk		number generator is used.
2656ecb0ccd9SWolfgang Denk
265728cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
265828cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
265928cb9375SWolfgang Denk		defined, the normal port 69 is used.
266028cb9375SWolfgang Denk
266128cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2662ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2663ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2664ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2665ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2666ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2667ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2668ecb0ccd9SWolfgang Denk
2669bf36c5d5SSimon Glass- Hashing support:
2670bf36c5d5SSimon Glass		CONFIG_CMD_HASH
2671bf36c5d5SSimon Glass
2672bf36c5d5SSimon Glass		This enables a generic 'hash' command which can produce
2673bf36c5d5SSimon Glass		hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2674bf36c5d5SSimon Glass
2675bf36c5d5SSimon Glass		CONFIG_HASH_VERIFY
2676bf36c5d5SSimon Glass
2677bf36c5d5SSimon Glass		Enable the hash verify command (hash -v). This adds to code
2678bf36c5d5SSimon Glass		size a little.
2679bf36c5d5SSimon Glass
2680bf36c5d5SSimon Glass		CONFIG_SHA1 - support SHA1 hashing
2681bf36c5d5SSimon Glass		CONFIG_SHA256 - support SHA256 hashing
2682bf36c5d5SSimon Glass
2683bf36c5d5SSimon Glass		Note: There is also a sha1sum command, which should perhaps
2684bf36c5d5SSimon Glass		be deprecated in favour of 'hash sha1'.
2685bf36c5d5SSimon Glass
2686a11f1873SRobert Winkler- Freescale i.MX specific commands:
2687a11f1873SRobert Winkler		CONFIG_CMD_HDMIDETECT
2688a11f1873SRobert Winkler		This enables 'hdmidet' command which returns true if an
2689a11f1873SRobert Winkler		HDMI monitor is detected.  This command is i.MX 6 specific.
2690a11f1873SRobert Winkler
2691a11f1873SRobert Winkler		CONFIG_CMD_BMODE
2692a11f1873SRobert Winkler		This enables the 'bmode' (bootmode) command for forcing
2693a11f1873SRobert Winkler		a boot from specific media.
2694a11f1873SRobert Winkler
2695a11f1873SRobert Winkler		This is useful for forcing the ROM's usb downloader to
2696a11f1873SRobert Winkler		activate upon a watchdog reset which is nice when iterating
2697a11f1873SRobert Winkler		on U-Boot.  Using the reset button or running bmode normal
2698a11f1873SRobert Winkler		will set it back to normal.  This command currently
2699a11f1873SRobert Winkler		supports i.MX53 and i.MX6.
2700a11f1873SRobert Winkler
270119c402afSSimon Glass- Signing support:
270219c402afSSimon Glass		CONFIG_RSA
270319c402afSSimon Glass
270419c402afSSimon Glass		This enables the RSA algorithm used for FIT image verification
270519c402afSSimon Glass		in U-Boot. See doc/uImage/signature for more information.
270619c402afSSimon Glass
270719c402afSSimon Glass		The signing part is build into mkimage regardless of this
270819c402afSSimon Glass		option.
270919c402afSSimon Glass
271019c402afSSimon Glass
2711a8c7c708Swdenk- Show boot progress:
2712c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2713c609719bSwdenk
2714c609719bSwdenk		Defining this option allows to add some board-
2715c609719bSwdenk		specific code (calling a user-provided function
2716c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2717c609719bSwdenk		the system's boot progress on some display (for
2718c609719bSwdenk		example, some LED's) on your board. At the moment,
2719c609719bSwdenk		the following checkpoints are implemented:
2720c609719bSwdenk
27213a608ca0SSimon Glass- Detailed boot stage timing
27223a608ca0SSimon Glass		CONFIG_BOOTSTAGE
27233a608ca0SSimon Glass		Define this option to get detailed timing of each stage
27243a608ca0SSimon Glass		of the boot process.
27253a608ca0SSimon Glass
27263a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
27273a608ca0SSimon Glass		This is the number of available user bootstage records.
27283a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
27293a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
27303a608ca0SSimon Glass		the limit, recording will stop.
27313a608ca0SSimon Glass
27323a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
27333a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
27343a608ca0SSimon Glass
27353a608ca0SSimon Glass		Timer summary in microseconds:
27363a608ca0SSimon Glass		       Mark    Elapsed  Stage
27373a608ca0SSimon Glass			  0          0  reset
27383a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
27393a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
27403a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
27413a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
27423a608ca0SSimon Glass		  3,910,375    250,777  main_loop
27433a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
27443a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
27453a608ca0SSimon Glass
27462eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
27472eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
27482eba38cfSSimon Glass		and un/stashing of bootstage data.
27492eba38cfSSimon Glass
275094fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
275194fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
275294fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
275394fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
275494fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
275594fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
275694fd1316SSimon Glass		For example:
275794fd1316SSimon Glass
275894fd1316SSimon Glass		bootstage {
275994fd1316SSimon Glass			154 {
276094fd1316SSimon Glass				name = "board_init_f";
276194fd1316SSimon Glass				mark = <3575678>;
276294fd1316SSimon Glass			};
276394fd1316SSimon Glass			170 {
276494fd1316SSimon Glass				name = "lcd";
276594fd1316SSimon Glass				accum = <33482>;
276694fd1316SSimon Glass			};
276794fd1316SSimon Glass		};
276894fd1316SSimon Glass
276994fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
277094fd1316SSimon Glass
27711372cce2SMarian BalakowiczLegacy uImage format:
27721372cce2SMarian Balakowicz
2773c609719bSwdenk  Arg	Where			When
2774c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2775c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2776c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2777c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2778c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2779c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2780c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2781c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2782c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
27831372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2784c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2785c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2786c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2787c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
27881372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2789c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
27901372cce2SMarian Balakowicz
27911372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
27921372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
27931372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
27941372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
27951372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
27961372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
27971372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
279811ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
27991372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
28001372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
28011372cce2SMarian Balakowicz
2802ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2803c609719bSwdenk
2804a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
280563e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
280663e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
280763e73c9aSwdenk
2808566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2809566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2810566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2811566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2812566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2813566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2814566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2815566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2816566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2817566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2818566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2819566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2820566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2821566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2822566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2823566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2824566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2825566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2826566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2827566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2828566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2829566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2830566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2831566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2832566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2833566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2834566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2835566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2836566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2837566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2838566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2839566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2840566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2841566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2842566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2843566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2844566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2845566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2846566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2847566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2848566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2849566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2850566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2851566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2852566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2853566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2854566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2855c609719bSwdenk
2856566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2857c609719bSwdenk
2858566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2859566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2860566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2861206c60cbSwdenk
2862566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2863566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
286411ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2865566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2866566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2867566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
286874de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
286974de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2870566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2871c609719bSwdenk
28721372cce2SMarian BalakowiczFIT uImage format:
28731372cce2SMarian Balakowicz
28741372cce2SMarian Balakowicz  Arg	Where			When
28751372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
28761372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
28771372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
28781372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
28791372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
28801372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2881f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
28821372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
28831372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
28841372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
28851372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
28861372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
288711ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
288811ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
28891372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
28901372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
28911372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
28921372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
28931372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
28941372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
28951372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
28961372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
28971372cce2SMarian Balakowicz
28981372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
28991372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
29001372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
290111ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
29021372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
29031372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
29041372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
29051372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
29061372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
29071372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
29081372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
29091372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
29101372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
29111372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
29121372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
29131372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
29141372cce2SMarian Balakowicz
291511ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
29161372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
29171372cce2SMarian Balakowicz
291811ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
29191372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
29201372cce2SMarian Balakowicz
292111ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
29221372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
29231372cce2SMarian Balakowicz
2924d95f6ec7SGabe Black- FIT image support:
2925d95f6ec7SGabe Black		CONFIG_FIT
2926d95f6ec7SGabe Black		Enable support for the FIT uImage format.
2927d95f6ec7SGabe Black
2928d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
2929d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
2930d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
2931d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
2932d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
2933d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
2934d95f6ec7SGabe Black
29353e569a6bSSimon Glass		CONFIG_FIT_SIGNATURE
29363e569a6bSSimon Glass		This option enables signature verification of FIT uImages,
29373e569a6bSSimon Glass		using a hash signed and verified using RSA. See
29383e569a6bSSimon Glass		doc/uImage.FIT/signature.txt for more details.
29393e569a6bSSimon Glass
29404cf2609bSWolfgang Denk- Standalone program support:
29414cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
29424cf2609bSWolfgang Denk
29436feff899SWolfgang Denk		This option defines a board specific value for the
29446feff899SWolfgang Denk		address where standalone program gets loaded, thus
29456feff899SWolfgang Denk		overwriting the architecture dependent default
29464cf2609bSWolfgang Denk		settings.
29474cf2609bSWolfgang Denk
29484cf2609bSWolfgang Denk- Frame Buffer Address:
29494cf2609bSWolfgang Denk		CONFIG_FB_ADDR
29504cf2609bSWolfgang Denk
29514cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
295244a53b57SWolfgang Denk		address for frame buffer.  This is typically the case
295344a53b57SWolfgang Denk		when using a graphics controller has separate video
295444a53b57SWolfgang Denk		memory.  U-Boot will then place the frame buffer at
295544a53b57SWolfgang Denk		the given address instead of dynamically reserving it
295644a53b57SWolfgang Denk		in system RAM by calling lcd_setmem(), which grabs
295744a53b57SWolfgang Denk		the memory for the frame buffer depending on the
295844a53b57SWolfgang Denk		configured panel size.
29594cf2609bSWolfgang Denk
29604cf2609bSWolfgang Denk		Please see board_init_f function.
29614cf2609bSWolfgang Denk
2962cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2963cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2964cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2965cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2966cccfc2abSDetlev Zundel
2967cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2968cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2969cccfc2abSDetlev Zundel
2970cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2971cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2972cccfc2abSDetlev Zundel
2973cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2974cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2975cccfc2abSDetlev Zundel
2976cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2977cccfc2abSDetlev Zundel
2978cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2979cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2980cccfc2abSDetlev Zundel
298170c219cdSJoe Hershberger- UBI support
298270c219cdSJoe Hershberger		CONFIG_CMD_UBI
298370c219cdSJoe Hershberger
298470c219cdSJoe Hershberger		Adds commands for interacting with MTD partitions formatted
298570c219cdSJoe Hershberger		with the UBI flash translation layer
298670c219cdSJoe Hershberger
298770c219cdSJoe Hershberger		Requires also defining CONFIG_RBTREE
298870c219cdSJoe Hershberger
2989147162daSJoe Hershberger		CONFIG_UBI_SILENCE_MSG
2990147162daSJoe Hershberger
2991147162daSJoe Hershberger		Make the verbose messages from UBI stop printing.  This leaves
2992147162daSJoe Hershberger		warnings and errors enabled.
2993147162daSJoe Hershberger
299470c219cdSJoe Hershberger- UBIFS support
299570c219cdSJoe Hershberger		CONFIG_CMD_UBIFS
299670c219cdSJoe Hershberger
299770c219cdSJoe Hershberger		Adds commands for interacting with UBI volumes formatted as
299870c219cdSJoe Hershberger		UBIFS.  UBIFS is read-only in u-boot.
299970c219cdSJoe Hershberger
300070c219cdSJoe Hershberger		Requires UBI support as well as CONFIG_LZO
300170c219cdSJoe Hershberger
3002147162daSJoe Hershberger		CONFIG_UBIFS_SILENCE_MSG
3003147162daSJoe Hershberger
3004147162daSJoe Hershberger		Make the verbose messages from UBIFS stop printing.  This leaves
3005147162daSJoe Hershberger		warnings and errors enabled.
3006147162daSJoe Hershberger
30076a11cf48SDaniel Schwierzeck- SPL framework
30086a11cf48SDaniel Schwierzeck		CONFIG_SPL
30096a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
30106a11cf48SDaniel Schwierzeck
301195579793STom Rini		CONFIG_SPL_LDSCRIPT
301295579793STom Rini		LDSCRIPT for linking the SPL binary.
301395579793STom Rini
30146ebc3461SAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT
30156ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL, BSS included.
30166ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory
30176ebc3461SAlbert ARIBAUD		used by SPL from _start to __bss_end does not exceed it.
30188960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
30196ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
30206ebc3461SAlbert ARIBAUD
302195579793STom Rini		CONFIG_SPL_MAX_SIZE
30226ebc3461SAlbert ARIBAUD		Maximum size of the SPL image (text, data, rodata, and
30236ebc3461SAlbert ARIBAUD		linker lists sections), BSS excluded.
30246ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual size does
30256ebc3461SAlbert ARIBAUD		not exceed it.
302695579793STom Rini
30276a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
30286a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
30296a11cf48SDaniel Schwierzeck
303094a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
303194a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
303294a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
303394a45bb1SScott Wood
303495579793STom Rini		CONFIG_SPL_BSS_START_ADDR
303595579793STom Rini		Link address for the BSS within the SPL binary.
303695579793STom Rini
303795579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
30386ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL BSS.
30396ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory used
30406ebc3461SAlbert ARIBAUD		by SPL from __bss_start to __bss_end does not exceed it.
30418960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
30426ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
304395579793STom Rini
304495579793STom Rini		CONFIG_SPL_STACK
304595579793STom Rini		Adress of the start of the stack SPL will use
304695579793STom Rini
304794a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
304894a45bb1SScott Wood		Adress of the start of the stack SPL will use after
304994a45bb1SScott Wood		relocation.  If unspecified, this is equal to
305094a45bb1SScott Wood		CONFIG_SPL_STACK.
305194a45bb1SScott Wood
305295579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
305395579793STom Rini		Starting address of the malloc pool used in SPL.
305495579793STom Rini
305595579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
305695579793STom Rini		The size of the malloc pool used in SPL.
30576a11cf48SDaniel Schwierzeck
305847f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
305947f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
306047f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
306147f7bcaeSTom Rini		NAND loading of the Linux Kernel.
306247f7bcaeSTom Rini
3063861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
3064861a86f4STom Rini		For ARM, enable an optional function to print more information
3065861a86f4STom Rini		about the running system.
3066861a86f4STom Rini
30674b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
30684b919725SScott Wood		Arch init code should be built for a very small image
30694b919725SScott Wood
30706a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
30716a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
30726a11cf48SDaniel Schwierzeck
30736a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
30746a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
30756a11cf48SDaniel Schwierzeck
30766a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
30776a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
30786a11cf48SDaniel Schwierzeck
30796a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
30806a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
30816a11cf48SDaniel Schwierzeck
30826a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
30836a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
30846a11cf48SDaniel Schwierzeck
308595579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
308695579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
308795579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
308895579793STom Rini		Address, size and partition on the MMC to load U-Boot from
308995579793STom Rini		when the MMC is being used in raw mode.
309095579793STom Rini
30912b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
30922b75b0adSPeter Korsgaard		Sector to load kernel uImage from when MMC is being
30932b75b0adSPeter Korsgaard		used in raw mode (for Falcon mode)
30942b75b0adSPeter Korsgaard
30952b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
30962b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
30972b75b0adSPeter Korsgaard		Sector and number of sectors to load kernel argument
30982b75b0adSPeter Korsgaard		parameters from when MMC is being used in raw mode
30992b75b0adSPeter Korsgaard		(for falcon mode)
31002b75b0adSPeter Korsgaard
310195579793STom Rini		CONFIG_SPL_FAT_SUPPORT
310295579793STom Rini		Support for fs/fat/libfat.o in SPL binary
310395579793STom Rini
310495579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
310595579793STom Rini		Filename to read to load U-Boot when reading from FAT
310695579793STom Rini
31077ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_KERNEL_NAME
31087ad2cc79SPeter Korsgaard		Filename to read to load kernel uImage when reading
31097ad2cc79SPeter Korsgaard		from FAT (for Falcon mode)
31107ad2cc79SPeter Korsgaard
31117ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_ARGS_NAME
31127ad2cc79SPeter Korsgaard		Filename to read to load kernel argument parameters
31137ad2cc79SPeter Korsgaard		when reading from FAT (for Falcon mode)
31147ad2cc79SPeter Korsgaard
311506f60ae3SScott Wood		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
311606f60ae3SScott Wood		Set this for NAND SPL on PPC mpc83xx targets, so that
311706f60ae3SScott Wood		start.S waits for the rest of the SPL to load before
311806f60ae3SScott Wood		continuing (the hardware starts execution after just
311906f60ae3SScott Wood		loading the first page rather than the full 4K).
312006f60ae3SScott Wood
31216f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
31226f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
31236f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
31246f2f01b9SScott Wood
31256f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
31266f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
31276f2f01b9SScott Wood
31286f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
31296f2f01b9SScott Wood		Include standard software ECC in the SPL
31306f2f01b9SScott Wood
313195579793STom Rini		CONFIG_SPL_NAND_SIMPLE
31327d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
31337d4b7955SScott Wood		expose the cmd_ctrl() interface.
313495579793STom Rini
3135bb0dc108SYing Zhang		CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
3136bb0dc108SYing Zhang		Set for the SPL on PPC mpc8xxx targets, support for
3137bb0dc108SYing Zhang		arch/powerpc/cpu/mpc8xxx/ddr/libddr.o in SPL binary.
3138bb0dc108SYing Zhang
31397c8eea59SYing Zhang		CONFIG_SPL_COMMON_INIT_DDR
31407c8eea59SYing Zhang		Set for common ddr init with serial presence detect in
31417c8eea59SYing Zhang		SPL binary.
31427c8eea59SYing Zhang
314395579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
314495579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
314595579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
314695579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
314795579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
314895579793STom Rini		Defines the size and behavior of the NAND that SPL uses
31497d4b7955SScott Wood		to read U-Boot
315095579793STom Rini
315195579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
31527d4b7955SScott Wood		Location in NAND to read U-Boot from
31537d4b7955SScott Wood
31547d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
31557d4b7955SScott Wood		Location in memory to load U-Boot to
31567d4b7955SScott Wood
31577d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
31587d4b7955SScott Wood		Size of image to load
315995579793STom Rini
316095579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
31617d4b7955SScott Wood		Entry point in loaded image to jump to
316295579793STom Rini
316395579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
316495579793STom Rini		Define this if you need to first read the OOB and then the
316595579793STom Rini		data. This is used for example on davinci plattforms.
316695579793STom Rini
316795579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
316895579793STom Rini		Support for an OMAP3-specific set of functions to return the
316995579793STom Rini		ID and MFR of the first attached NAND chip, if present.
317095579793STom Rini
31716a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
31726a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
31736a11cf48SDaniel Schwierzeck
31746a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
31756a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
31766a11cf48SDaniel Schwierzeck
31776a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
31786a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
31796a11cf48SDaniel Schwierzeck
3180c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
3181c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
3182c57b953dSPavel Machek
31836a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
31846a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
31851372cce2SMarian Balakowicz
3186ba1bee43SYing Zhang		CONFIG_SPL_ENV_SUPPORT
3187ba1bee43SYing Zhang		Support for the environment operating in SPL binary
3188ba1bee43SYing Zhang
3189ba1bee43SYing Zhang		CONFIG_SPL_NET_SUPPORT
3190ba1bee43SYing Zhang		Support for the net/libnet.o in SPL binary.
3191ba1bee43SYing Zhang		It conflicts with SPL env from storage medium specified by
3192ba1bee43SYing Zhang		CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3193ba1bee43SYing Zhang
319474752baaSScott Wood		CONFIG_SPL_PAD_TO
31956113d3f2SBenoît Thébaudeau		Image offset to which the SPL should be padded before appending
31966113d3f2SBenoît Thébaudeau		the SPL payload. By default, this is defined as
31976113d3f2SBenoît Thébaudeau		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
31986113d3f2SBenoît Thébaudeau		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
31996113d3f2SBenoît Thébaudeau		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
320074752baaSScott Wood
3201ca2fca22SScott Wood		CONFIG_SPL_TARGET
3202ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
3203ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
3204ca2fca22SScott Wood		example if more than one image needs to be produced.
3205ca2fca22SScott Wood
320687ebee39SSimon Glass		CONFIG_FIT_SPL_PRINT
320787ebee39SSimon Glass		Printing information about a FIT image adds quite a bit of
320887ebee39SSimon Glass		code to SPL. So this is normally disabled in SPL. Use this
320987ebee39SSimon Glass		option to re-enable it. This will affect the output of the
321087ebee39SSimon Glass		bootm command when booting a FIT image.
321187ebee39SSimon Glass
32123aa29de0SYing Zhang- TPL framework
32133aa29de0SYing Zhang		CONFIG_TPL
32143aa29de0SYing Zhang		Enable building of TPL globally.
32153aa29de0SYing Zhang
32163aa29de0SYing Zhang		CONFIG_TPL_PAD_TO
32173aa29de0SYing Zhang		Image offset to which the TPL should be padded before appending
32183aa29de0SYing Zhang		the TPL payload. By default, this is defined as
32193aa29de0SYing Zhang		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
32203aa29de0SYing Zhang		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
32213aa29de0SYing Zhang		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
32223aa29de0SYing Zhang
3223c609719bSwdenkModem Support:
3224c609719bSwdenk--------------
3225c609719bSwdenk
3226566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
3227c609719bSwdenk
322811ccc33fSMarcel Ziswiler- Modem support enable:
3229c609719bSwdenk		CONFIG_MODEM_SUPPORT
3230c609719bSwdenk
3231c609719bSwdenk- RTS/CTS Flow control enable:
3232c609719bSwdenk		CONFIG_HWFLOW
3233c609719bSwdenk
3234c609719bSwdenk- Modem debug support:
3235c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
3236c609719bSwdenk
3237c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
3238c609719bSwdenk		for modem support. Useful only with BDI2000.
3239c609719bSwdenk
3240a8c7c708Swdenk- Interrupt support (PPC):
3241a8c7c708Swdenk
3242a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
3243a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
324411ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
3245a8c7c708Swdenk		should set decrementer_count to appropriate value. If
324611ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
3247a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
324811ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
3249a8c7c708Swdenk		specific handling. If board has watchdog / status_led
3250a8c7c708Swdenk		/ other_activity_monitor it works automatically from
3251a8c7c708Swdenk		general timer_interrupt().
3252a8c7c708Swdenk
3253c609719bSwdenk- General:
3254c609719bSwdenk
3255c609719bSwdenk		In the target system modem support is enabled when a
3256c609719bSwdenk		specific key (key combination) is pressed during
3257c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
325811ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
3259c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
3260c609719bSwdenk		function, returning 1 and thus enabling modem
3261c609719bSwdenk		initialization.
3262c609719bSwdenk
3263c609719bSwdenk		If there are no modem init strings in the
3264c609719bSwdenk		environment, U-Boot proceed to autoboot; the
3265c609719bSwdenk		previous output (banner, info printfs) will be
326611ccc33fSMarcel Ziswiler		suppressed, though.
3267c609719bSwdenk
3268c609719bSwdenk		See also: doc/README.Modem
3269c609719bSwdenk
32709660e442SHelmut RaigerBoard initialization settings:
32719660e442SHelmut Raiger------------------------------
32729660e442SHelmut Raiger
32739660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
32749660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
32759660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
32769660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
32779660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
32789660e442SHelmut Raigertypically in board_init_f() and board_init_r().
32799660e442SHelmut Raiger
32809660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
32819660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
32829660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
32839660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3284c609719bSwdenk
3285c609719bSwdenkConfiguration Settings:
3286c609719bSwdenk-----------------------
3287c609719bSwdenk
32886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3289c609719bSwdenk		undefine this when you're short of memory.
3290c609719bSwdenk
32912fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
32922fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
32932fb2604dSPeter Tyser
32946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
3295c609719bSwdenk		prompt for user input.
3296c609719bSwdenk
32976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
3298c609719bSwdenk
32996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
3300c609719bSwdenk
33016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
3302c609719bSwdenk
33036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3304c609719bSwdenk		the application (usually a Linux kernel) when it is
3305c609719bSwdenk		booted
3306c609719bSwdenk
33076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
3308c609719bSwdenk		List of legal baudrate settings for this board.
3309c609719bSwdenk
33106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
3311c609719bSwdenk		Suppress display of console information at boot.
3312c609719bSwdenk
33136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
3314c609719bSwdenk		If the board specific function
3315c609719bSwdenk			extern int overwrite_console (void);
3316c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
3317c609719bSwdenk		serial port, else the settings in the environment are used.
3318c609719bSwdenk
33196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3320c609719bSwdenk		Enable the call to overwrite_console().
3321c609719bSwdenk
33226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3323c609719bSwdenk		Enable overwrite of previous console environment settings.
3324c609719bSwdenk
33256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3326c609719bSwdenk		Begin and End addresses of the area used by the
3327c609719bSwdenk		simple memory test.
3328c609719bSwdenk
33296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
3330c609719bSwdenk		Enable an alternate, more extensive memory test.
3331c609719bSwdenk
33326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
33335f535fe1Swdenk		Scratch address used by the alternate memory test
33345f535fe1Swdenk		You only need to set this if address zero isn't writeable
33355f535fe1Swdenk
33366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
33376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
333814f73ca6SStefan Roese		this specified memory area will get subtracted from the top
333911ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
334014f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
334114f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
334214f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
33435e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
334414f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
33455e12e75dSStefan Roese		will have to get fixed in Linux additionally.
334614f73ca6SStefan Roese
334714f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
334814f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
334914f73ca6SStefan Roese		be touched.
335014f73ca6SStefan Roese
335114f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
335214f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
335314f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
335414f73ca6SStefan Roese		non page size aligned address and this could cause major
335514f73ca6SStefan Roese		problems.
335614f73ca6SStefan Roese
33576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
3358c609719bSwdenk		Enable temporary baudrate change while serial download
3359c609719bSwdenk
33606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
3361c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
3362c609719bSwdenk
33636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
3364c609719bSwdenk		Physical start address of Motherboard I/O (if using a
3365c609719bSwdenk		Cogent motherboard)
3366c609719bSwdenk
33676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
3368c609719bSwdenk		Physical start address of Flash memory.
3369c609719bSwdenk
33706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
3371c609719bSwdenk		Physical start address of boot monitor code (set by
3372c609719bSwdenk		make config files to be same as the text base address
337314d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
33746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
3375c609719bSwdenk
33766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
33773b57fe0aSwdenk		Size of memory reserved for monitor code, used to
33783b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
33793b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
33803b57fe0aSwdenk		flash sector.
3381c609719bSwdenk
33826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
3383c609719bSwdenk		Size of DRAM reserved for malloc() use.
3384c609719bSwdenk
33856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
338615940c9aSStefan Roese		Normally compressed uImages are limited to an
338715940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
33886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
338915940c9aSStefan Roese		to adjust this setting to your needs.
3390c609719bSwdenk
33916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
3392c609719bSwdenk		Maximum size of memory mapped by the startup code of
3393c609719bSwdenk		the Linux kernel; all data that must be processed by
33947d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
33957d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
33961bce2aebSRobert P. J. Day		environment variable is defined and non-zero. In such case
33977d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
3398c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
3399c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
3400c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
3401c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
3402c609719bSwdenk
3403fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3404fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
3405fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
3406fca43cc8SJohn Rigby		is enabled.
3407fca43cc8SJohn Rigby
3408fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3409fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3410fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3411fca43cc8SJohn Rigby
3412fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3413fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3414fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3415fca43cc8SJohn Rigby
34166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3417c609719bSwdenk		Max number of Flash memory banks
3418c609719bSwdenk
34196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3420c609719bSwdenk		Max number of sectors on a Flash chip
3421c609719bSwdenk
34226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3423c609719bSwdenk		Timeout for Flash erase operations (in ms)
3424c609719bSwdenk
34256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3426c609719bSwdenk		Timeout for Flash write operations (in ms)
3427c609719bSwdenk
34286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
34298564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
34308564acf9Swdenk
34316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
34328564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
34338564acf9Swdenk
34346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
34358564acf9Swdenk		If defined, hardware flash sectors protection is used
34368564acf9Swdenk		instead of U-Boot software protection.
34378564acf9Swdenk
34386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3439c609719bSwdenk
3440c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3441c609719bSwdenk		without this option such a download has to be
3442c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3443c609719bSwdenk		copy from RAM to flash.
3444c609719bSwdenk
3445c609719bSwdenk		The two-step approach is usually more reliable, since
3446c609719bSwdenk		you can check if the download worked before you erase
344711ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
344811ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3449c609719bSwdenk		downloaded image) this option may be very useful.
3450c609719bSwdenk
34516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3452c609719bSwdenk		Define if the flash driver uses extra elements in the
34535653fc33Swdenk		common flash structure for storing flash geometry.
34545653fc33Swdenk
345500b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
34565653fc33Swdenk		This option also enables the building of the cfi_flash driver
34575653fc33Swdenk		in the drivers directory
345853cf9435Sstroese
345991809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
346091809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
346191809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
346291809ed5SPiotr Ziecik		to the MTD layer.
346391809ed5SPiotr Ziecik
34646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
346596ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
346696ef831fSGuennadi Liakhovetski
346796ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
346896ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
346996ef831fSGuennadi Liakhovetski		write commands.
347096ef831fSGuennadi Liakhovetski
34716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
34725568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
34735568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
34745568e613SStefan Roese		is useful, if some of the configured banks are only
34755568e613SStefan Roese		optionally available.
34765568e613SStefan Roese
34779a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
34789a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
34799a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
34809a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
34819a042e9cSJerry Van Baren
3482352ef3f1SStefan Roese- CONFIG_FLASH_VERIFY
3483352ef3f1SStefan Roese		If defined, the content of the flash (destination) is compared
3484352ef3f1SStefan Roese		against the source after the write operation. An error message
3485352ef3f1SStefan Roese		will be printed when the contents are not identical.
3486352ef3f1SStefan Roese		Please note that this option is useless in nearly all cases,
3487352ef3f1SStefan Roese		since such flash programming errors usually are detected earlier
3488352ef3f1SStefan Roese		while unprotecting/erasing/programming. Please only enable
3489352ef3f1SStefan Roese		this option if you really know what you are doing.
3490352ef3f1SStefan Roese
34916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
349211ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
349311ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
349453cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
349553cf9435Sstroese		buffers can be full shortly after enabling the interface
349611ccc33fSMarcel Ziswiler		on high Ethernet traffic.
349753cf9435Sstroese		Defaults to 4 if not defined.
3498c609719bSwdenk
3499ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3500ea882bafSWolfgang Denk
3501ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3502ea882bafSWolfgang Denk	internally to store the environment settings. The default
3503ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3504ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3505ea882bafSWolfgang Denk	lib/hashtable.c for details.
3506ea882bafSWolfgang Denk
35072598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_DEFAULT
35082598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_STATIC
35091bce2aebSRobert P. J. Day	Enable validation of the values given to environment variables when
35102598090bSJoe Hershberger	calling env set.  Variables can be restricted to only decimal,
35112598090bSJoe Hershberger	hexadecimal, or boolean.  If CONFIG_CMD_NET is also defined,
35122598090bSJoe Hershberger	the variables can also be restricted to IP address or MAC address.
35132598090bSJoe Hershberger
35142598090bSJoe Hershberger	The format of the list is:
35152598090bSJoe Hershberger		type_attribute = [s|d|x|b|i|m]
3516267541f7SJoe Hershberger		access_atribute = [a|r|o|c]
3517267541f7SJoe Hershberger		attributes = type_attribute[access_atribute]
35182598090bSJoe Hershberger		entry = variable_name[:attributes]
35192598090bSJoe Hershberger		list = entry[,list]
35202598090bSJoe Hershberger
35212598090bSJoe Hershberger	The type attributes are:
35222598090bSJoe Hershberger		s - String (default)
35232598090bSJoe Hershberger		d - Decimal
35242598090bSJoe Hershberger		x - Hexadecimal
35252598090bSJoe Hershberger		b - Boolean ([1yYtT|0nNfF])
35262598090bSJoe Hershberger		i - IP address
35272598090bSJoe Hershberger		m - MAC address
35282598090bSJoe Hershberger
3529267541f7SJoe Hershberger	The access attributes are:
3530267541f7SJoe Hershberger		a - Any (default)
3531267541f7SJoe Hershberger		r - Read-only
3532267541f7SJoe Hershberger		o - Write-once
3533267541f7SJoe Hershberger		c - Change-default
3534267541f7SJoe Hershberger
35352598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_DEFAULT
35362598090bSJoe Hershberger		Define this to a list (string) to define the ".flags"
35372598090bSJoe Hershberger		envirnoment variable in the default or embedded environment.
35382598090bSJoe Hershberger
35392598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_STATIC
35402598090bSJoe Hershberger		Define this to a list (string) to define validation that
35412598090bSJoe Hershberger		should be done if an entry is not found in the ".flags"
35422598090bSJoe Hershberger		environment variable.  To override a setting in the static
35432598090bSJoe Hershberger		list, simply add an entry for the same variable name to the
35442598090bSJoe Hershberger		".flags" variable.
35452598090bSJoe Hershberger
3546267541f7SJoe Hershberger- CONFIG_ENV_ACCESS_IGNORE_FORCE
3547267541f7SJoe Hershberger	If defined, don't allow the -f switch to env set override variable
3548267541f7SJoe Hershberger	access flags.
3549267541f7SJoe Hershberger
35505c1a7ea6SSimon Glass- CONFIG_SYS_GENERIC_BOARD
35515c1a7ea6SSimon Glass	This selects the architecture-generic board system instead of the
35525c1a7ea6SSimon Glass	architecture-specific board files. It is intended to move boards
35535c1a7ea6SSimon Glass	to this new framework over time. Defining this will disable the
35545c1a7ea6SSimon Glass	arch/foo/lib/board.c file and use common/board_f.c and
35555c1a7ea6SSimon Glass	common/board_r.c instead. To use this option your architecture
35565c1a7ea6SSimon Glass	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
35575c1a7ea6SSimon Glass	its config.mk file). If you find problems enabling this option on
35585c1a7ea6SSimon Glass	your board please report the problem and send patches!
35595c1a7ea6SSimon Glass
3560632efa74SSimon Glass- CONFIG_SYS_SYM_OFFSETS
3561632efa74SSimon Glass	This is set by architectures that use offsets for link symbols
3562632efa74SSimon Glass	instead of absolute values. So bss_start is obtained using an
3563632efa74SSimon Glass	offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
3564632efa74SSimon Glass	directly. You should not need to touch this setting.
3565632efa74SSimon Glass
35660b1b60c7SLokesh Vutla- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
35670b1b60c7SLokesh Vutla	This is set by OMAP boards for the max time that reset should
35680b1b60c7SLokesh Vutla	be asserted. See doc/README.omap-reset-time for details on how
35690b1b60c7SLokesh Vutla	the value can be calulated on a given board.
3570632efa74SSimon Glass
3571c609719bSwdenkThe following definitions that deal with the placement and management
3572c609719bSwdenkof environment data (variable area); in general, we support the
3573c609719bSwdenkfollowing configurations:
3574c609719bSwdenk
3575c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3576c3eb3fe4SMike Frysinger
3577c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3578c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3579c3eb3fe4SMike Frysinger
35805a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3581c609719bSwdenk
3582c609719bSwdenk	Define this if the environment is in flash memory.
3583c609719bSwdenk
3584c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3585c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3586c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3587c609719bSwdenk	   sector" type flash chips, which have several smaller
3588c609719bSwdenk	   sectors at the start or the end. For instance, such a
3589c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3590c609719bSwdenk	   such a case you would place the environment in one of the
3591c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3592c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3593c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3594c609719bSwdenk	   between U-Boot and the environment.
3595c609719bSwdenk
35960e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3597c609719bSwdenk
3598c609719bSwdenk	   Offset of environment data (variable area) to the
3599c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3600c609719bSwdenk	   type flash chips the second sector can be used: the offset
3601c609719bSwdenk	   for this sector is given here.
3602c609719bSwdenk
36036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3604c609719bSwdenk
36050e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3606c609719bSwdenk
3607c609719bSwdenk	   This is just another way to specify the start address of
3608c609719bSwdenk	   the flash sector containing the environment (instead of
36090e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3610c609719bSwdenk
36110e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3612c609719bSwdenk
3613c609719bSwdenk	   Size of the sector containing the environment.
3614c609719bSwdenk
3615c609719bSwdenk
3616c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3617c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3618c609719bSwdenk	   the environment.
3619c609719bSwdenk
36200e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3621c609719bSwdenk
36225a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
36230e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3624c609719bSwdenk	   of this flash sector for the environment. This saves
3625c609719bSwdenk	   memory for the RAM copy of the environment.
3626c609719bSwdenk
3627c609719bSwdenk	   It may also save flash memory if you decide to use this
3628c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3629c609719bSwdenk	   since then the remainder of the flash sector could be used
3630c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3631c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3632c609719bSwdenk	   updating the environment in flash makes it always
3633c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3634c609719bSwdenk	   wrong before the contents has been restored from a copy in
3635c609719bSwdenk	   RAM, your target system will be dead.
3636c609719bSwdenk
36370e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
36380e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3639c609719bSwdenk
3640c609719bSwdenk	   These settings describe a second storage area used to hold
364111ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
36423e38691eSwdenk	   a valid backup copy in case there is a power failure during
3643c609719bSwdenk	   a "saveenv" operation.
3644c609719bSwdenk
3645c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3646c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3647c609719bSwdenkaccordingly!
3648c609719bSwdenk
3649c609719bSwdenk
36509314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3651c609719bSwdenk
3652c609719bSwdenk	Define this if you have some non-volatile memory device
3653c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3654c609719bSwdenk	environment.
3655c609719bSwdenk
36560e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
36570e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3658c609719bSwdenk
365911ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3660c609719bSwdenk	  want to use for environment. It is assumed that this memory
3661c609719bSwdenk	  can just be read and written to, without any special
3662c609719bSwdenk	  provision.
3663c609719bSwdenk
3664c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3665c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
366611ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3667c609719bSwdenkU-Boot will hang.
3668c609719bSwdenk
3669c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3670c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3671c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3672c609719bSwdenkto save the current settings.
3673c609719bSwdenk
3674c609719bSwdenk
3675bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3676c609719bSwdenk
3677c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3678c609719bSwdenk	device and a driver for it.
3679c609719bSwdenk
36800e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
36810e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3682c609719bSwdenk
3683c609719bSwdenk	  These two #defines specify the offset and size of the
3684c609719bSwdenk	  environment area within the total memory of your EEPROM.
3685c609719bSwdenk
36866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3687c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3688c609719bSwdenk	  The default address is zero.
3689c609719bSwdenk
36906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3691c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3692c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3693c609719bSwdenk	  would require six bits.
3694c609719bSwdenk
36956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3696c609719bSwdenk	  If defined, the number of milliseconds to delay between
3697c609719bSwdenk	  page writes.	The default is zero milliseconds.
3698c609719bSwdenk
36996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3700c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3701c609719bSwdenk	  that this is NOT the chip address length!
3702c609719bSwdenk
37036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
37045cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
37055cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
37065cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
37075cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
37085cf91d6bSwdenk	  byte chips.
37095cf91d6bSwdenk
37105cf91d6bSwdenk	  Note that we consider the length of the address field to
37115cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
37125cf91d6bSwdenk	  in the chip address.
37135cf91d6bSwdenk
37146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3715c609719bSwdenk	  The size in bytes of the EEPROM device.
3716c609719bSwdenk
3717548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3718548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3719548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3720548738b4SHeiko Schocher
3721548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3722548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3723548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3724548738b4SHeiko Schocher	  EEPROM. For example:
3725548738b4SHeiko Schocher
3726ea818dbbSHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  1
3727548738b4SHeiko Schocher
3728548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3729548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3730c609719bSwdenk
3731057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
37325779d8d9Swdenk
37335779d8d9Swdenk	Define this if you have a DataFlash memory device which you
37345779d8d9Swdenk	want to use for the environment.
37355779d8d9Swdenk
37360e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
37370e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
37380e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
37395779d8d9Swdenk
37405779d8d9Swdenk	  These three #defines specify the offset and size of the
37415779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
37425779d8d9Swdenk	  at the specified address.
37435779d8d9Swdenk
37440a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
37450a85a9e7SLiu Gang
37460a85a9e7SLiu Gang	Define this if you have a remote memory space which you
37470a85a9e7SLiu Gang	want to use for the local device's environment.
37480a85a9e7SLiu Gang
37490a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
37500a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
37510a85a9e7SLiu Gang
37520a85a9e7SLiu Gang	  These two #defines specify the address and size of the
37530a85a9e7SLiu Gang	  environment area within the remote memory space. The
37540a85a9e7SLiu Gang	  local device can get the environment from remote memory
3755fc54c7faSLiu Gang	  space by SRIO or PCIE links.
37560a85a9e7SLiu Gang
37570a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
37580a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3759fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3760fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
37610a85a9e7SLiu Gang
376251bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
376313a5695bSwdenk
376413a5695bSwdenk	Define this if you have a NAND device which you want to use
376513a5695bSwdenk	for the environment.
376613a5695bSwdenk
37670e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
37680e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
376913a5695bSwdenk
377013a5695bSwdenk	  These two #defines specify the offset and size of the environment
3771fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3772fdd813deSScott Wood	  aligned to an erase block boundary.
37735779d8d9Swdenk
3774fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3775e443c944SMarkus Klotzbuecher
37760e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3777fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3778fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3779fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3780fdd813deSScott Wood	  aligned to an erase block boundary.
3781e443c944SMarkus Klotzbuecher
3782fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3783fdd813deSScott Wood
3784fdd813deSScott Wood	  Specifies the length of the region in which the environment
3785fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3786fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3787fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3788fdd813deSScott Wood	  the range to be avoided.
3789fdd813deSScott Wood
3790fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3791fdd813deSScott Wood
3792fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3793fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3794fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3795fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3796fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3797e443c944SMarkus Klotzbuecher
3798b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3799b74ab737SGuennadi Liakhovetski
3800b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3801b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3802b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3803b74ab737SGuennadi Liakhovetski
38042b74433fSJoe Hershberger- CONFIG_ENV_IS_IN_UBI:
38052b74433fSJoe Hershberger
38062b74433fSJoe Hershberger	Define this if you have an UBI volume that you want to use for the
38072b74433fSJoe Hershberger	environment.  This has the benefit of wear-leveling the environment
38082b74433fSJoe Hershberger	accesses, which is important on NAND.
38092b74433fSJoe Hershberger
38102b74433fSJoe Hershberger	- CONFIG_ENV_UBI_PART:
38112b74433fSJoe Hershberger
38122b74433fSJoe Hershberger	  Define this to a string that is the mtd partition containing the UBI.
38132b74433fSJoe Hershberger
38142b74433fSJoe Hershberger	- CONFIG_ENV_UBI_VOLUME:
38152b74433fSJoe Hershberger
38162b74433fSJoe Hershberger	  Define this to the name of the volume that you want to store the
38172b74433fSJoe Hershberger	  environment in.
38182b74433fSJoe Hershberger
3819785881f7SJoe Hershberger	- CONFIG_ENV_UBI_VOLUME_REDUND:
3820785881f7SJoe Hershberger
3821785881f7SJoe Hershberger	  Define this to the name of another volume to store a second copy of
3822785881f7SJoe Hershberger	  the environment in.  This will enable redundant environments in UBI.
3823785881f7SJoe Hershberger	  It is assumed that both volumes are in the same MTD partition.
3824785881f7SJoe Hershberger
38252b74433fSJoe Hershberger	- CONFIG_UBI_SILENCE_MSG
38262b74433fSJoe Hershberger	- CONFIG_UBIFS_SILENCE_MSG
38272b74433fSJoe Hershberger
38282b74433fSJoe Hershberger	  You will probably want to define these to avoid a really noisy system
38292b74433fSJoe Hershberger	  when storing the env in UBI.
38302b74433fSJoe Hershberger
383106e4ae5fSStephen Warren- CONFIG_ENV_IS_IN_MMC:
383206e4ae5fSStephen Warren
383306e4ae5fSStephen Warren	Define this if you have an MMC device which you want to use for the
383406e4ae5fSStephen Warren	environment.
383506e4ae5fSStephen Warren
383606e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_DEV:
383706e4ae5fSStephen Warren
383806e4ae5fSStephen Warren	  Specifies which MMC device the environment is stored in.
383906e4ae5fSStephen Warren
384006e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_PART (optional):
384106e4ae5fSStephen Warren
384206e4ae5fSStephen Warren	  Specifies which MMC partition the environment is stored in. If not
384306e4ae5fSStephen Warren	  set, defaults to partition 0, the user area. Common values might be
384406e4ae5fSStephen Warren	  1 (first MMC boot partition), 2 (second MMC boot partition).
384506e4ae5fSStephen Warren
384606e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET:
384706e4ae5fSStephen Warren	- CONFIG_ENV_SIZE:
384806e4ae5fSStephen Warren
384906e4ae5fSStephen Warren	  These two #defines specify the offset and size of the environment
385006e4ae5fSStephen Warren	  area within the specified MMC device.
385106e4ae5fSStephen Warren
38525c088ee8SStephen Warren	  If offset is positive (the usual case), it is treated as relative to
38535c088ee8SStephen Warren	  the start of the MMC partition. If offset is negative, it is treated
38545c088ee8SStephen Warren	  as relative to the end of the MMC partition. This can be useful if
38555c088ee8SStephen Warren	  your board may be fitted with different MMC devices, which have
38565c088ee8SStephen Warren	  different sizes for the MMC partitions, and you always want the
38575c088ee8SStephen Warren	  environment placed at the very end of the partition, to leave the
38585c088ee8SStephen Warren	  maximum possible space before it, to store other data.
38595c088ee8SStephen Warren
386006e4ae5fSStephen Warren	  These two values are in units of bytes, but must be aligned to an
386106e4ae5fSStephen Warren	  MMC sector boundary.
386206e4ae5fSStephen Warren
386306e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET_REDUND (optional):
386406e4ae5fSStephen Warren
386506e4ae5fSStephen Warren	  Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
386606e4ae5fSStephen Warren	  hold a redundant copy of the environment data. This provides a
386706e4ae5fSStephen Warren	  valid backup copy in case the other copy is corrupted, e.g. due
386806e4ae5fSStephen Warren	  to a power failure during a "saveenv" operation.
386906e4ae5fSStephen Warren
38705c088ee8SStephen Warren	  This value may also be positive or negative; this is handled in the
38715c088ee8SStephen Warren	  same way as CONFIG_ENV_OFFSET.
38725c088ee8SStephen Warren
387306e4ae5fSStephen Warren	  This value is also in units of bytes, but must also be aligned to
387406e4ae5fSStephen Warren	  an MMC sector boundary.
387506e4ae5fSStephen Warren
387606e4ae5fSStephen Warren	- CONFIG_ENV_SIZE_REDUND (optional):
387706e4ae5fSStephen Warren
387806e4ae5fSStephen Warren	  This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
387906e4ae5fSStephen Warren	  set. If this value is set, it must be set to the same value as
388006e4ae5fSStephen Warren	  CONFIG_ENV_SIZE.
388106e4ae5fSStephen Warren
38826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3883c609719bSwdenk
3884c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3885c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3886c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3887c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3888c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3889c609719bSwdenk	to be a good choice since it makes it far enough from the
3890c609719bSwdenk	start of the data area as well as from the stack pointer.
3891c609719bSwdenk
3892e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3893c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3894cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3895c609719bSwdenkuntil then to read environment variables.
3896c609719bSwdenk
389785ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
389885ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
389985ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
390085ec0bccSwdenknecessary, because the first environment variable we need is the
390185ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
390285ec0bccSwdenkhave any device yet where we could complain.]
3903c609719bSwdenk
3904c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3905c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
390685ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3907c609719bSwdenk
39086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3909fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3910fc3e2165Swdenk
39116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3912fc3e2165Swdenk		      also needs to be defined.
3913fc3e2165Swdenk
39146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3915fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3916c609719bSwdenk
3917f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3918f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3919f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3920f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3921f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3922f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3923f5675aa5SRon Madrid
3924b2b92f53SSimon Glass- CONFIG_DISPLAY_BOARDINFO
3925b2b92f53SSimon Glass		Display information about the board that U-Boot is running on
3926b2b92f53SSimon Glass		when U-Boot starts up. The board function checkboard() is called
3927b2b92f53SSimon Glass		to do this.
3928b2b92f53SSimon Glass
3929e2e3e2b1SSimon Glass- CONFIG_DISPLAY_BOARDINFO_LATE
3930e2e3e2b1SSimon Glass		Similar to the previous option, but display this information
3931e2e3e2b1SSimon Glass		later, once stdio is running and output goes to the LCD, if
3932e2e3e2b1SSimon Glass		present.
3933e2e3e2b1SSimon Glass
3934c609719bSwdenkLow Level (hardware related) configuration options:
3935dc7c9a1aSwdenk---------------------------------------------------
3936c609719bSwdenk
39376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3938c609719bSwdenk		Cache Line Size of the CPU.
3939c609719bSwdenk
39406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3941c609719bSwdenk		Default address of the IMMR after system reset.
39422535d602Swdenk
39432535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
39442535d602Swdenk		and RPXsuper) to be able to adjust the position of
39452535d602Swdenk		the IMMR register after a reset.
3946c609719bSwdenk
3947e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3948e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3949e46fedfeSTimur Tabi		PowerPC SOCs.
3950e46fedfeSTimur Tabi
3951e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3952e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3953e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3954e46fedfeSTimur Tabi
3955e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3956e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3957e46fedfeSTimur Tabi
3958e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3959e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3960e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3961e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3962e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3963e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3964e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3965e46fedfeSTimur Tabi
3966e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3967e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3968e46fedfeSTimur Tabi
3969e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3970e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3971e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3972e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3973e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3974e46fedfeSTimur Tabi
3975e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3976e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3977e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3978e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3979e46fedfeSTimur Tabi
3980e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3981e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3982e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3983e46fedfeSTimur Tabi
39847f6c2cbcSwdenk- Floppy Disk Support:
39856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
39867f6c2cbcSwdenk
39877f6c2cbcSwdenk		the default drive number (default value 0)
39887f6c2cbcSwdenk
39896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
39907f6c2cbcSwdenk
399111ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
39927f6c2cbcSwdenk		(default value 1)
39937f6c2cbcSwdenk
39946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
39957f6c2cbcSwdenk
39967f6c2cbcSwdenk		defines the offset of register from address. It
39977f6c2cbcSwdenk		depends on which part of the data bus is connected to
399811ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
39997f6c2cbcSwdenk
40006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
40016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
40027f6c2cbcSwdenk		default value.
40037f6c2cbcSwdenk
40046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
40057f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
40067f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
40077f6c2cbcSwdenk		source code. It is used to make hardware dependant
40087f6c2cbcSwdenk		initializations.
40097f6c2cbcSwdenk
40100abddf82SMacpaul Lin- CONFIG_IDE_AHB:
40110abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
40120abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
40130abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
40140abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
40150abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
40160abddf82SMacpaul Lin		is requierd.
40170abddf82SMacpaul Lin
40186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
401925d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
402025d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
4021c609719bSwdenk
40226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
4023c609719bSwdenk
40247152b1d0Swdenk		Start address of memory area that can be used for
4025c609719bSwdenk		initial data and stack; please note that this must be
4026c609719bSwdenk		writable memory that is working WITHOUT special
4027c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
4028c609719bSwdenk		will become available only after programming the
4029c609719bSwdenk		memory controller and running certain initialization
4030c609719bSwdenk		sequences.
4031c609719bSwdenk
4032c609719bSwdenk		U-Boot uses the following memory types:
4033c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
4034c609719bSwdenk		- MPC824X: data cache
4035c609719bSwdenk		- PPC4xx:  data cache
4036c609719bSwdenk
40376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
4038c609719bSwdenk
4039c609719bSwdenk		Offset of the initial data structure in the memory
40406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
40416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
4042c609719bSwdenk		data is located at the end of the available space
4043553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
40446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
40456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
40466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
4047c609719bSwdenk
4048c609719bSwdenk	Note:
4049c609719bSwdenk		On the MPC824X (or other systems that use the data
4050c609719bSwdenk		cache for initial memory) the address chosen for
40516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
4052c609719bSwdenk		point to an otherwise UNUSED address space between
4053c609719bSwdenk		the top of RAM and the start of the PCI space.
4054c609719bSwdenk
40556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
4056c609719bSwdenk
40576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
4058c609719bSwdenk
40596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
4060c609719bSwdenk
40616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
4062c609719bSwdenk
40636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
4064c609719bSwdenk
40656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
4066c609719bSwdenk
40676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
4068c609719bSwdenk		SDRAM timing
4069c609719bSwdenk
40706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
4071c609719bSwdenk		periodic timer for refresh
4072c609719bSwdenk
40736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
4074c609719bSwdenk
40756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
40766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
40776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
40786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
4079c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
4080c609719bSwdenk
4081c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
40826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
40836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
4084c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
4085c609719bSwdenk
40866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
40876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
4088c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
4089c609719bSwdenk		Prescaler definitions (SDRAM timing)
4090c609719bSwdenk
40916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
4092c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
4093c609719bSwdenk		define relocation offset in DPRAM [DSP2]
4094c609719bSwdenk
40956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
4096b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
4097b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
4098b423d055SHeiko Schocher
40996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
4100c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
4101c609719bSwdenk		define relocation offset in DPRAM [SCC4]
4102c609719bSwdenk
41036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
4104c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
4105c609719bSwdenk		wrong setting might damage your board. Read
4106c609719bSwdenk		doc/README.MBX before setting this variable!
4107c609719bSwdenk
41086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
4109ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
4110ea909b76Swdenk		(Power On Self Tests). This definition overrides
4111ea909b76Swdenk		#define'd default value in commproc.h resp.
4112ea909b76Swdenk		cpm_8260.h.
4113ea909b76Swdenk
41146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
41156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
41166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
41176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
41186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
41196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
41206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
41216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
4122a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
41235d232d0eSwdenk
41249cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
41259cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
41269cacf4fcSDirk Eibach		required.
41279cacf4fcSDirk Eibach
412869fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
412969fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
413069fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
413169fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
413269fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
413369fd2d3bSAndrew Sharp		by coreboot or similar.
413469fd2d3bSAndrew Sharp
4135842033e6SGabor Juhos- CONFIG_PCI_INDIRECT_BRIDGE:
4136842033e6SGabor Juhos		Enable support for indirect PCI bridges.
4137842033e6SGabor Juhos
4138a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
4139a09b9b68SKumar Gala		Chip has SRIO or not
4140a09b9b68SKumar Gala
4141a09b9b68SKumar Gala- CONFIG_SRIO1:
4142a09b9b68SKumar Gala		Board has SRIO 1 port available
4143a09b9b68SKumar Gala
4144a09b9b68SKumar Gala- CONFIG_SRIO2:
4145a09b9b68SKumar Gala		Board has SRIO 2 port available
4146a09b9b68SKumar Gala
4147c8b28152SLiu Gang- CONFIG_SRIO_PCIE_BOOT_MASTER
4148c8b28152SLiu Gang		Board can support master function for Boot from SRIO and PCIE
4149c8b28152SLiu Gang
4150a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
4151a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
4152a09b9b68SKumar Gala
4153a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
4154a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
4155a09b9b68SKumar Gala
4156a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
4157a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
4158a09b9b68SKumar Gala
415966bd1846SFabio Estevam- CONFIG_SYS_NAND_BUSWIDTH_16BIT
416066bd1846SFabio Estevam		Defined to tell the NAND controller that the NAND chip is using
416166bd1846SFabio Estevam		a 16 bit bus.
416266bd1846SFabio Estevam		Not all NAND drivers use this symbol.
4163a430e916SFabio Estevam		Example of drivers that use it:
416466bd1846SFabio Estevam		- drivers/mtd/nand/ndfc.c
4165a430e916SFabio Estevam		- drivers/mtd/nand/mxc_nand.c
4166eced4626SAlex Waterman
4167eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
4168eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
4169eced4626SAlex Waterman		a default value will be used.
4170eced4626SAlex Waterman
4171bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
4172218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
4173218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
4174218ca724SWolfgang Denk
4175bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
4176bb99ad6dSBen Warren		I2C address of the SPD EEPROM
4177bb99ad6dSBen Warren
41786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
4179218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
4180218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
4181218ca724SWolfgang Denk		to something your driver can deal with.
4182bb99ad6dSBen Warren
41831b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
41841b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
41851b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
41861b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
41871b3e3c4fSYork Sun		header files or board specific files.
41881b3e3c4fSYork Sun
41896f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
41906f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
41916f5e1dc5SYork Sun
41926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
4193218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
4194218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
41952ad6b513STimur Tabi
4196c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
4197c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
4198c26e454dSwdenk
4199c26e454dSwdenk- CONFIG_FEC[12]_PHY
4200c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
42016e592385Swdenk		to the given FEC; i. e.
4202c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
4203c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
4204c26e454dSwdenk
4205c26e454dSwdenk		When set to -1, means to probe for first available.
4206c26e454dSwdenk
4207c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
4208c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
4209c26e454dSwdenk		(so program the FEC to ignore it).
4210c26e454dSwdenk
4211c26e454dSwdenk- CONFIG_RMII
4212c26e454dSwdenk		Enable RMII mode for all FECs.
4213c26e454dSwdenk		Note that this is a global option, we can't
4214c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
4215c26e454dSwdenk
42165cf91d6bSwdenk- CONFIG_CRC32_VERIFY
42175cf91d6bSwdenk		Add a verify option to the crc32 command.
42185cf91d6bSwdenk		The syntax is:
42195cf91d6bSwdenk
42205cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
42215cf91d6bSwdenk
42225cf91d6bSwdenk		Where address/count indicate a memory area
42235cf91d6bSwdenk		and crc32 is the correct crc32 which the
42245cf91d6bSwdenk		area should have.
42255cf91d6bSwdenk
422656523f12Swdenk- CONFIG_LOOPW
422756523f12Swdenk		Add the "loopw" memory command. This only takes effect if
4228602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
422956523f12Swdenk
42307b466641Sstroese- CONFIG_MX_CYCLIC
42317b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
42327b466641Sstroese		"md/mw" commands.
42337b466641Sstroese		Examples:
42347b466641Sstroese
42357b466641Sstroese		=> mdc.b 10 4 500
42367b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
42377b466641Sstroese
42387b466641Sstroese		=> mwc.l 100 12345678 10
42397b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
42407b466641Sstroese
42417b466641Sstroese		This only takes effect if the memory commands are activated
4242602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
42437b466641Sstroese
42448aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
4245afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
4246e03f3169SWolfgang Denk		low level initializations (like setting up the memory
4247e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
4248e03f3169SWolfgang Denk		relocate itself into RAM.
42498aa1a2d1Swdenk
4250e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
4251e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
4252e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
4253e03f3169SWolfgang Denk		these initializations itself.
42548aa1a2d1Swdenk
4255401bb30bSAneesh V- CONFIG_SPL_BUILD
4256df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
4257df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
4258df81238bSMagnus Lilja		compiling a NAND SPL.
4259400558b5Swdenk
42603aa29de0SYing Zhang- CONFIG_TPL_BUILD
42613aa29de0SYing Zhang		Modifies the behaviour of start.S  when compiling a loader
42623aa29de0SYing Zhang		that is executed after the SPL and before the actual U-Boot.
42633aa29de0SYing Zhang		It is loaded by the SPL.
42643aa29de0SYing Zhang
42655df572f0SYing Zhang- CONFIG_SYS_MPC85XX_NO_RESETVEC
42665df572f0SYing Zhang		Only for 85xx systems. If this variable is specified, the section
42675df572f0SYing Zhang		.resetvec is not kept and the section .bootpg is placed in the
42685df572f0SYing Zhang		previous 4k of the .text section.
42695df572f0SYing Zhang
42704213fc29SSimon Glass- CONFIG_ARCH_MAP_SYSMEM
42714213fc29SSimon Glass		Generally U-Boot (and in particular the md command) uses
42724213fc29SSimon Glass		effective address. It is therefore not necessary to regard
42734213fc29SSimon Glass		U-Boot address as virtual addresses that need to be translated
42744213fc29SSimon Glass		to physical addresses. However, sandbox requires this, since
42754213fc29SSimon Glass		it maintains its own little RAM buffer which contains all
42764213fc29SSimon Glass		addressable memory. This option causes some memory accesses
42774213fc29SSimon Glass		to be mapped through map_sysmem() / unmap_sysmem().
42784213fc29SSimon Glass
4279d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
4280d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
4281d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
4282d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
4283d8834a13SMatthias Weisser		conditions but may increase the binary size.
4284d8834a13SMatthias Weisser
4285588a13f7SSimon Glass- CONFIG_X86_RESET_VECTOR
4286588a13f7SSimon Glass		If defined, the x86 reset vector code is included. This is not
4287588a13f7SSimon Glass		needed when U-Boot is running from Coreboot.
4288b16f521aSGabe Black
4289fc33705eSMark Jackson- CONFIG_SYS_MPUCLK
4290fc33705eSMark Jackson		Defines the MPU clock speed (in MHz).
4291fc33705eSMark Jackson
4292fc33705eSMark Jackson		NOTE : currently only supported on AM335x platforms.
42935b5ece9eSGabe Black
4294f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
4295f2717b47STimur Tabi-----------------------------------
4296f2717b47STimur Tabi
4297f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4298f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
4299f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
4300f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
4301f2717b47STimur Tabiwithin that device.
4302f2717b47STimur Tabi
4303f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
4304f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
4305f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4306f2717b47STimur Tabi	is also specified.
4307f2717b47STimur Tabi
4308f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
4309f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
4310f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
4311f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
4312f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
4313f2717b47STimur Tabi
4314f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
4315f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4316f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
4317f2717b47STimur Tabi	virtual address in NOR flash.
4318f2717b47STimur Tabi
4319f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
4320f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
4321f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4322f2717b47STimur Tabi
4323f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
4324f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
4325f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4326f2717b47STimur Tabi
4327f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4328f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
4329f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4330f2717b47STimur Tabi
4331292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4332292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
4333292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4334fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4335fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
4336fc54c7faSLiu Gang	master's memory space.
4337f2717b47STimur Tabi
4338c609719bSwdenkBuilding the Software:
4339c609719bSwdenk======================
4340c609719bSwdenk
4341218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
4342218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
4343218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
4344218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
4345218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4346218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
4347c609719bSwdenk
4348218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
4349218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
4350218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
4351218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
4352218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
4353c609719bSwdenk
4354218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
4355218ca724SWolfgang Denk	$ export CROSS_COMPILE
4356c609719bSwdenk
43572f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
43582f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
43592f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
43602f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
43612f8d396bSPeter Tyser
43622f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
43632f8d396bSPeter Tyser
43642f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
43652f8d396bSPeter Tyser      be executed on computers running Windows.
43662f8d396bSPeter Tyser
4367c609719bSwdenkU-Boot is intended to be simple to build. After installing the
4368c609719bSwdenksources you must configure U-Boot for one specific board type. This
4369c609719bSwdenkis done by typing:
4370c609719bSwdenk
4371c609719bSwdenk	make NAME_config
4372c609719bSwdenk
4373218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
43744d675ae6SMichael Jonesrations; see boards.cfg for supported names.
437554387ac9Swdenk
4376c609719bSwdenkNote: for some board special configuration names may exist; check if
4377c609719bSwdenk      additional information is available from the board vendor; for
43782729af9dSwdenk      instance, the TQM823L systems are available without (standard)
43792729af9dSwdenk      or with LCD support. You can select such additional "features"
438011ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
4381c609719bSwdenk
43822729af9dSwdenk      make TQM823L_config
43832729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
4384c609719bSwdenk
4385c609719bSwdenk      make TQM823L_LCD_config
4386c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
4387c609719bSwdenk
4388c609719bSwdenk      etc.
4389c609719bSwdenk
4390c609719bSwdenk
4391c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
43927152b1d0Swdenkimages ready for download to / installation on your system:
4393c609719bSwdenk
4394c609719bSwdenk- "u-boot.bin" is a raw binary image
4395c609719bSwdenk- "u-boot" is an image in ELF binary format
4396c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
4397c609719bSwdenk
4398baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
4399baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
4400baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
4401baf31249SMarian Balakowicz
4402baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
4403baf31249SMarian Balakowicz
4404baf31249SMarian Balakowicz	make O=/tmp/build distclean
4405baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
4406baf31249SMarian Balakowicz	make O=/tmp/build all
4407baf31249SMarian Balakowicz
4408baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
4409baf31249SMarian Balakowicz
4410baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4411baf31249SMarian Balakowicz	make distclean
4412baf31249SMarian Balakowicz	make NAME_config
4413baf31249SMarian Balakowicz	make all
4414baf31249SMarian Balakowicz
4415baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
4416baf31249SMarian Balakowiczvariable.
4417baf31249SMarian Balakowicz
4418c609719bSwdenk
4419c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
4420c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
4421c609719bSwdenknative "make".
4422c609719bSwdenk
4423c609719bSwdenk
4424c609719bSwdenkIf the system board that you have is not listed, then you will need
4425c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
4426c609719bSwdenksteps:
4427c609719bSwdenk
4428c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
44294d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
44304d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
4431c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
443285ec0bccSwdenk    files you need. In your board directory, you will need at least
443385ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
443485ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
443585ec0bccSwdenk    your board
4436c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
4437c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
443885ec0bccSwdenk4.  Run "make <board>_config" with your new name.
4439c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
4440c609719bSwdenk    to be installed on your target system.
444185ec0bccSwdenk6.  Debug and solve any problems that might arise.
4442c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
4443c609719bSwdenk
4444c609719bSwdenk
4445c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
4446c609719bSwdenk==============================================================
4447c609719bSwdenk
4448c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
4449c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
4450c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
4451c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
4452218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
4453c609719bSwdenk
4454c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
4455c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
4456c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
4457c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
4458c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
44597152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
4460218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
4461218ca724SWolfgang Denkyou can type
4462c609719bSwdenk
4463c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
4464c609719bSwdenk
4465c609719bSwdenkor to build on a native PowerPC system you can type
4466c609719bSwdenk
4467c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
4468c609719bSwdenk
4469218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
4470218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
4471218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
4472218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
4473218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
4474218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
4475218ca724SWolfgang Denkvariable. For example:
4476baf31249SMarian Balakowicz
4477baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4478baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
4479baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
4480baf31249SMarian Balakowicz
4481218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
4482218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
4483218ca724SWolfgang Denkduring the whole build process.
4484baf31249SMarian Balakowicz
4485baf31249SMarian Balakowicz
4486c609719bSwdenkSee also "U-Boot Porting Guide" below.
4487c609719bSwdenk
4488c609719bSwdenk
4489c609719bSwdenkMonitor Commands - Overview:
4490c609719bSwdenk============================
4491c609719bSwdenk
4492c609719bSwdenkgo	- start application at address 'addr'
4493c609719bSwdenkrun	- run commands in an environment variable
4494c609719bSwdenkbootm	- boot application image from memory
4495c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
449644f074c7SMarek Vasutbootz   - boot zImage from memory
4497c609719bSwdenktftpboot- boot image via network using TFTP protocol
4498c609719bSwdenk	       and env variables "ipaddr" and "serverip"
4499c609719bSwdenk	       (and eventually "gatewayip")
45001fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
4501c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
4502c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
4503c609719bSwdenkloads	- load S-Record file over serial line
4504c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
4505c609719bSwdenkmd	- memory display
4506c609719bSwdenkmm	- memory modify (auto-incrementing)
4507c609719bSwdenknm	- memory modify (constant address)
4508c609719bSwdenkmw	- memory write (fill)
4509c609719bSwdenkcp	- memory copy
4510c609719bSwdenkcmp	- memory compare
4511c609719bSwdenkcrc32	- checksum calculation
45120f89c54bSPeter Tyseri2c	- I2C sub-system
4513c609719bSwdenksspi	- SPI utility commands
4514c609719bSwdenkbase	- print or set address offset
4515c609719bSwdenkprintenv- print environment variables
4516c609719bSwdenksetenv	- set environment variables
4517c609719bSwdenksaveenv - save environment variables to persistent storage
4518c609719bSwdenkprotect - enable or disable FLASH write protection
4519c609719bSwdenkerase	- erase FLASH memory
4520c609719bSwdenkflinfo	- print FLASH memory information
452110635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
4522c609719bSwdenkbdinfo	- print Board Info structure
4523c609719bSwdenkiminfo	- print header information for application image
4524c609719bSwdenkconinfo - print console devices and informations
4525c609719bSwdenkide	- IDE sub-system
4526c609719bSwdenkloop	- infinite loop on address range
452756523f12Swdenkloopw	- infinite write loop on address range
4528c609719bSwdenkmtest	- simple RAM test
4529c609719bSwdenkicache	- enable or disable instruction cache
4530c609719bSwdenkdcache	- enable or disable data cache
4531c609719bSwdenkreset	- Perform RESET of the CPU
4532c609719bSwdenkecho	- echo args to console
4533c609719bSwdenkversion - print monitor version
4534c609719bSwdenkhelp	- print online help
4535c609719bSwdenk?	- alias for 'help'
4536c609719bSwdenk
4537c609719bSwdenk
4538c609719bSwdenkMonitor Commands - Detailed Description:
4539c609719bSwdenk========================================
4540c609719bSwdenk
4541c609719bSwdenkTODO.
4542c609719bSwdenk
4543c609719bSwdenkFor now: just type "help <command>".
4544c609719bSwdenk
4545c609719bSwdenk
4546c609719bSwdenkEnvironment Variables:
4547c609719bSwdenk======================
4548c609719bSwdenk
4549c609719bSwdenkU-Boot supports user configuration using Environment Variables which
4550c609719bSwdenkcan be made persistent by saving to Flash memory.
4551c609719bSwdenk
4552c609719bSwdenkEnvironment Variables are set using "setenv", printed using
4553c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
4554c609719bSwdenkwithout a value can be used to delete a variable from the
4555c609719bSwdenkenvironment. As long as you don't save the environment you are
4556c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
4557c609719bSwdenkenvironment is erased by accident, a default environment is provided.
4558c609719bSwdenk
4559c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
4560c96f86eeSWolfgang Denk
4561c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
4562c609719bSwdenk
4563c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
4564c609719bSwdenk
4565c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
4566c609719bSwdenk
4567c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
4568c609719bSwdenk
4569c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
4570c609719bSwdenk
4571c609719bSwdenk  bootfile	- Name of the image to load with TFTP
4572c609719bSwdenk
45737d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
45747d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
45757d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
45767d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
45777d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
45787d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
4579c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4580c3624e6eSGrant Likely		  bootm_mapsize.
4581c3624e6eSGrant Likely
4582c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
4583c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
4584c3624e6eSGrant Likely		  defines the size of the memory region starting at base
4585c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
4586c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
4587c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
4588c3624e6eSGrant Likely		  used otherwise.
45897d721e34SBartlomiej Sieka
45907d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
45917d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
45927d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
45937d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
45947d721e34SBartlomiej Sieka		  environment variable.
45957d721e34SBartlomiej Sieka
45964bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
45974bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
45984bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
45994bae9090SBartlomiej Sieka
4600c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
4601c609719bSwdenk		  "bootp" will just load perform a lookup of the
4602c609719bSwdenk		  configuration from the BOOTP server, but not try to
4603c609719bSwdenk		  load any image using TFTP
4604c609719bSwdenk
4605c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
4606c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
4607c609719bSwdenk		  be automatically started (by internally calling
4608c609719bSwdenk		  "bootm")
4609c609719bSwdenk
46104a6fd34bSwdenk		  If set to "no", a standalone image passed to the
46114a6fd34bSwdenk		  "bootm" command will be copied to the load address
46124a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
46134a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
46144a6fd34bSwdenk		  data.
46154a6fd34bSwdenk
4616a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
4617a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
4618fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
4619fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
4620fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
4621fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
4622fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
4623fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
4624fa34f6b2SShawn Guo		  access it during the boot procedure.
4625fa34f6b2SShawn Guo
4626a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
4627a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
4628a28afca5SDavid A. Long		  to work it must reside in writable memory, have
4629a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
4630a28afca5SDavid A. Long		  add the information it needs into it, and the memory
4631a28afca5SDavid A. Long		  must be accessible by the kernel.
4632a28afca5SDavid A. Long
4633eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
4634eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
4635eea63e05SSimon Glass		  defined.
4636eea63e05SSimon Glass
463717ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
463817ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
463917ea1177Swdenk		  mode (400kHZ). This environment variable is used in
464017ea1177Swdenk		  initialization code. So, for changes to be effective
464117ea1177Swdenk		  it must be saved and board must be reset.
464217ea1177Swdenk
4643c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
4644c609719bSwdenk		  If this variable is not set, initrd images will be
4645c609719bSwdenk		  copied to the highest possible address in RAM; this
4646c609719bSwdenk		  is usually what you want since it allows for
4647c609719bSwdenk		  maximum initrd size. If for some reason you want to
4648c609719bSwdenk		  make sure that the initrd image is loaded below the
46496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4650c609719bSwdenk		  variable to a value of "no" or "off" or "0".
4651c609719bSwdenk		  Alternatively, you can set it to a maximum upper
4652c609719bSwdenk		  address to use (U-Boot will still check that it
4653c609719bSwdenk		  does not overwrite the U-Boot stack and data).
4654c609719bSwdenk
4655c609719bSwdenk		  For instance, when you have a system with 16 MB
46567152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
4657c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
4658c609719bSwdenk		  the "bootargs" variable. However, now you must make
46597152b1d0Swdenk		  sure that the initrd image is placed in the first
4660c609719bSwdenk		  12 MB as well - this can be done with
4661c609719bSwdenk
4662c609719bSwdenk		  setenv initrd_high 00c00000
4663c609719bSwdenk
466438b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
466538b99261Swdenk		  indication to U-Boot that all addresses are legal
466638b99261Swdenk		  for the Linux kernel, including addresses in flash
466738b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
466838b99261Swdenk		  ramdisk at all. This may be useful to reduce the
466938b99261Swdenk		  boot time on your system, but requires that this
467038b99261Swdenk		  feature is supported by your Linux kernel.
467138b99261Swdenk
4672c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
4673c609719bSwdenk
4674c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
4675dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
4676c609719bSwdenk
4677c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
4678c609719bSwdenk
4679c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
4680c609719bSwdenk
4681c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
4682c609719bSwdenk
4683c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
4684c609719bSwdenk
4685c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
4686c609719bSwdenk
4687e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
4688a3d991bdSwdenk
4689e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
4690e2a53458SMike Frysinger		  For example you can do the following
4691a3d991bdSwdenk
469248690d80SHeiko Schocher		  => setenv ethact FEC
469348690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
469448690d80SHeiko Schocher		  => setenv ethact SCC
469548690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
4696a3d991bdSwdenk
4697e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
4698e1692577SMatthias Fuchs		  available network interfaces.
4699e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
4700e1692577SMatthias Fuchs
4701a3d991bdSwdenk  netretry	- When set to "no" each network operation will
4702a3d991bdSwdenk		  either succeed or fail without retrying.
47036e592385Swdenk		  When set to "once" the network operation will
47046e592385Swdenk		  fail when all the available network interfaces
47056e592385Swdenk		  are tried once without success.
4706a3d991bdSwdenk		  Useful on scripts which control the retry operation
4707a3d991bdSwdenk		  themselves.
4708a3d991bdSwdenk
4709b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
4710a1cf027aSJean-Christophe PLAGNIOL-VILLARD
47118d51aacdSSimon Glass  silent_linux  - If set then linux will be told to boot silently, by
47128d51aacdSSimon Glass		  changing the console to be empty. If "yes" it will be
47138d51aacdSSimon Glass		  made silent. If "no" it will not be made silent. If
47148d51aacdSSimon Glass		  unset, then it will be made silent if the U-Boot console
47158d51aacdSSimon Glass		  is silent.
47168d51aacdSSimon Glass
471728cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
4718ecb0ccd9SWolfgang Denk		  UDP source port.
4719ecb0ccd9SWolfgang Denk
472028cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
472128cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
472228cb9375SWolfgang Denk
4723c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
4724c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
4725c96f86eeSWolfgang Denk
4726c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
4727c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
4728c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
4729c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
4730c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
4731c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
4732c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
4733c96f86eeSWolfgang Denk
4734a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
473511ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
4736a3d991bdSwdenk		  VLAN tagged frames.
4737c609719bSwdenk
4738dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4739dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4740dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4741dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4742dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4743dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4744dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4745dc0b7b0eSJason Hobbs
4746dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4747dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4748dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4749dc0b7b0eSJason Hobbs
4750dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4751dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4752dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4753dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4754dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4755dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4756dc0b7b0eSJason Hobbs
4757c609719bSwdenkThe following environment variables may be used and automatically
4758c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4759c609719bSwdenkdepending the information provided by your boot server:
4760c609719bSwdenk
4761c609719bSwdenk  bootfile	- see above
4762c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4763fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4764c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4765c609719bSwdenk  hostname	- Target hostname
4766c609719bSwdenk  ipaddr	- see above
4767c609719bSwdenk  netmask	- Subnet Mask
4768c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4769c609719bSwdenk  serverip	- see above
4770c609719bSwdenk
4771c609719bSwdenk
4772c609719bSwdenkThere are two special Environment Variables:
4773c609719bSwdenk
4774c609719bSwdenk  serial#	- contains hardware identification information such
4775c609719bSwdenk		  as type string and/or serial number
4776c609719bSwdenk  ethaddr	- Ethernet address
4777c609719bSwdenk
4778c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4779c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4780c609719bSwdenkonce they have been set once.
4781c609719bSwdenk
4782c609719bSwdenk
4783c1551ea8SstroeseFurther special Environment Variables:
4784c1551ea8Sstroese
4785c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4786c1551ea8Sstroese		  with the "version" command. This variable is
4787c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4788c1551ea8Sstroese
4789c1551ea8Sstroese
4790c609719bSwdenkPlease note that changes to some configuration parameters may take
4791c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4792c609719bSwdenk
4793c609719bSwdenk
4794170ab110SJoe HershbergerCallback functions for environment variables:
4795170ab110SJoe Hershberger---------------------------------------------
4796170ab110SJoe Hershberger
4797170ab110SJoe HershbergerFor some environment variables, the behavior of u-boot needs to change
4798170ab110SJoe Hershbergerwhen their values are changed.  This functionailty allows functions to
4799170ab110SJoe Hershbergerbe associated with arbitrary variables.  On creation, overwrite, or
4800170ab110SJoe Hershbergerdeletion, the callback will provide the opportunity for some side
4801170ab110SJoe Hershbergereffect to happen or for the change to be rejected.
4802170ab110SJoe Hershberger
4803170ab110SJoe HershbergerThe callbacks are named and associated with a function using the
4804170ab110SJoe HershbergerU_BOOT_ENV_CALLBACK macro in your board or driver code.
4805170ab110SJoe Hershberger
4806170ab110SJoe HershbergerThese callbacks are associated with variables in one of two ways.  The
4807170ab110SJoe Hershbergerstatic list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4808170ab110SJoe Hershbergerin the board configuration to a string that defines a list of
4809170ab110SJoe Hershbergerassociations.  The list must be in the following format:
4810170ab110SJoe Hershberger
4811170ab110SJoe Hershberger	entry = variable_name[:callback_name]
4812170ab110SJoe Hershberger	list = entry[,list]
4813170ab110SJoe Hershberger
4814170ab110SJoe HershbergerIf the callback name is not specified, then the callback is deleted.
4815170ab110SJoe HershbergerSpaces are also allowed anywhere in the list.
4816170ab110SJoe Hershberger
4817170ab110SJoe HershbergerCallbacks can also be associated by defining the ".callbacks" variable
4818170ab110SJoe Hershbergerwith the same list format above.  Any association in ".callbacks" will
4819170ab110SJoe Hershbergeroverride any association in the static list. You can define
4820170ab110SJoe HershbergerCONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4821170ab110SJoe Hershberger".callbacks" envirnoment variable in the default or embedded environment.
4822170ab110SJoe Hershberger
4823170ab110SJoe Hershberger
4824f07771ccSwdenkCommand Line Parsing:
4825f07771ccSwdenk=====================
4826f07771ccSwdenk
4827f07771ccSwdenkThere are two different command line parsers available with U-Boot:
48287152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
4829f07771ccSwdenk
4830f07771ccSwdenkOld, simple command line parser:
4831f07771ccSwdenk--------------------------------
4832f07771ccSwdenk
4833f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4834f07771ccSwdenk- several commands on one line, separated by ';'
4835fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4836f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4837f07771ccSwdenk  for example:
4838fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4839f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4840f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4841f07771ccSwdenk
4842f07771ccSwdenkHush shell:
4843f07771ccSwdenk-----------
4844f07771ccSwdenk
4845f07771ccSwdenk- similar to Bourne shell, with control structures like
4846f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4847f07771ccSwdenk  until...do...done, ...
4848f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4849f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4850f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4851f07771ccSwdenk  command
4852f07771ccSwdenk
4853f07771ccSwdenkGeneral rules:
4854f07771ccSwdenk--------------
4855f07771ccSwdenk
4856f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4857f07771ccSwdenk    command) contains several commands separated by semicolon, and
4858f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4859f07771ccSwdenk    executed anyway.
4860f07771ccSwdenk
4861f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
486211ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4863f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4864f07771ccSwdenk    variables are not executed.
4865f07771ccSwdenk
4866c609719bSwdenkNote for Redundant Ethernet Interfaces:
4867c609719bSwdenk=======================================
4868c609719bSwdenk
486911ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4870c609719bSwdenksuch configurations and is capable of automatic selection of a
48717152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4872c609719bSwdenk
4873c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4874c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4875c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4876c609719bSwdenk
4877c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4878c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4879c609719bSwdenkding setting in the environment; if the corresponding environment
4880c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4881c609719bSwdenk
4882c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4883c609719bSwdenk  environment, the SROM's address is used.
4884c609719bSwdenk
4885c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4886c609719bSwdenk  environment exists, then the value from the environment variable is
4887c609719bSwdenk  used.
4888c609719bSwdenk
4889c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4890c609719bSwdenk  both addresses are the same, this MAC address is used.
4891c609719bSwdenk
4892c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4893c609719bSwdenk  addresses differ, the value from the environment is used and a
4894c609719bSwdenk  warning is printed.
4895c609719bSwdenk
4896c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4897c609719bSwdenk  is raised.
4898c609719bSwdenk
4899ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4900ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4901ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4902ecee9324SBen WarrenThe naming convention is as follows:
4903ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4904c609719bSwdenk
4905c609719bSwdenkImage Formats:
4906c609719bSwdenk==============
4907c609719bSwdenk
49083310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
49093310c549SMarian Balakowiczimages in two formats:
49103310c549SMarian Balakowicz
49113310c549SMarian BalakowiczNew uImage format (FIT)
49123310c549SMarian Balakowicz-----------------------
49133310c549SMarian Balakowicz
49143310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
49153310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
49163310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
49173310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
49183310c549SMarian Balakowicz
49193310c549SMarian Balakowicz
49203310c549SMarian BalakowiczOld uImage format
49213310c549SMarian Balakowicz-----------------
49223310c549SMarian Balakowicz
49233310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
49243310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
49253310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4926c609719bSwdenk
4927c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4928c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4929f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4930f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4931f5ed9e39SPeter Tyser  INTEGRITY).
49327b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4933afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4934afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4935c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4936c609719bSwdenk* Load Address
4937c609719bSwdenk* Entry Point
4938c609719bSwdenk* Image Name
4939c609719bSwdenk* Image Timestamp
4940c609719bSwdenk
4941c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4942c609719bSwdenkand the data portions of the image are secured against corruption by
4943c609719bSwdenkCRC32 checksums.
4944c609719bSwdenk
4945c609719bSwdenk
4946c609719bSwdenkLinux Support:
4947c609719bSwdenk==============
4948c609719bSwdenk
4949c609719bSwdenkAlthough U-Boot should support any OS or standalone application
49507152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4951c609719bSwdenkU-Boot.
4952c609719bSwdenk
4953c609719bSwdenkU-Boot includes many features that so far have been part of some
4954c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4955c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4956c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
49577152b1d0Swdenkserves several purposes:
4958c609719bSwdenk
4959c609719bSwdenk- the same features can be used for other OS or standalone
4960c609719bSwdenk  applications (for instance: using compressed images to reduce the
4961c609719bSwdenk  Flash memory footprint)
4962c609719bSwdenk
4963c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
49647152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4965c609719bSwdenk
4966c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4967c609719bSwdenk  images; of course this also means that different kernel images can
4968c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4969c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4970c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4971c609719bSwdenk  software is easier now.
4972c609719bSwdenk
4973c609719bSwdenk
4974c609719bSwdenkLinux HOWTO:
4975c609719bSwdenk============
4976c609719bSwdenk
4977c609719bSwdenkPorting Linux to U-Boot based systems:
4978c609719bSwdenk---------------------------------------
4979c609719bSwdenk
4980c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4981c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4982c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4983c609719bSwdenkLinux :-).
4984c609719bSwdenk
4985a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4986c609719bSwdenk
4987c609719bSwdenkJust make sure your machine specific header file (for instance
4988c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
49891dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
49901dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
49916d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4992c609719bSwdenk
4993c609719bSwdenk
4994c609719bSwdenkConfiguring the Linux kernel:
4995c609719bSwdenk-----------------------------
4996c609719bSwdenk
4997c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4998c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4999c609719bSwdenk
5000c609719bSwdenk
5001c609719bSwdenkBuilding a Linux Image:
5002c609719bSwdenk-----------------------
5003c609719bSwdenk
500424ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
500524ee89b9Swdenknot used. If you use recent kernel source, a new build target
500624ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
500724ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
500824ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
500924ee89b9Swdenk100% compatible format.
5010c609719bSwdenk
5011c609719bSwdenkExample:
5012c609719bSwdenk
5013c609719bSwdenk	make TQM850L_config
5014c609719bSwdenk	make oldconfig
5015c609719bSwdenk	make dep
501624ee89b9Swdenk	make uImage
5017c609719bSwdenk
501824ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
501924ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
502024ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
5021c609719bSwdenk
502224ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
502324ee89b9Swdenk
502424ee89b9Swdenk* convert the kernel into a raw binary image:
502524ee89b9Swdenk
502624ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
502724ee89b9Swdenk				 -R .note -R .comment \
502824ee89b9Swdenk				 -S vmlinux linux.bin
502924ee89b9Swdenk
503024ee89b9Swdenk* compress the binary image:
503124ee89b9Swdenk
503224ee89b9Swdenk	gzip -9 linux.bin
503324ee89b9Swdenk
503424ee89b9Swdenk* package compressed binary image for U-Boot:
503524ee89b9Swdenk
503624ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
503724ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
503824ee89b9Swdenk		-d linux.bin.gz uImage
503924ee89b9Swdenk
504024ee89b9Swdenk
504124ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
504224ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
504324ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
504424ee89b9Swdenkbyte header containing information about target architecture,
504524ee89b9Swdenkoperating system, image type, compression method, entry points, time
504624ee89b9Swdenkstamp, CRC32 checksums, etc.
504724ee89b9Swdenk
504824ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
504924ee89b9Swdenkprint the header information, or to build new images.
5050c609719bSwdenk
5051c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
5052c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
5053c609719bSwdenkchecksum verification:
5054c609719bSwdenk
5055c609719bSwdenk	tools/mkimage -l image
5056c609719bSwdenk	  -l ==> list image header information
5057c609719bSwdenk
5058c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
5059c609719bSwdenkfrom a "data file" which is used as image payload:
5060c609719bSwdenk
5061c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
5062c609719bSwdenk		      -n name -d data_file image
5063c609719bSwdenk	  -A ==> set architecture to 'arch'
5064c609719bSwdenk	  -O ==> set operating system to 'os'
5065c609719bSwdenk	  -T ==> set image type to 'type'
5066c609719bSwdenk	  -C ==> set compression type 'comp'
5067c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
5068c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
5069c609719bSwdenk	  -n ==> set image name to 'name'
5070c609719bSwdenk	  -d ==> use image data from 'datafile'
5071c609719bSwdenk
507269459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
507369459791Swdenkaddress (0x00000000), but the entry point address depends on the
507469459791Swdenkkernel version:
5075c609719bSwdenk
5076c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
507724ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
5078c609719bSwdenk
5079c609719bSwdenkSo a typical call to build a U-Boot image would read:
5080c609719bSwdenk
508124ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
508224ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
5083a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
508424ee89b9Swdenk	> examples/uImage.TQM850L
508524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5086c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5087c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5088c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5089c609719bSwdenk	Load Address: 0x00000000
509024ee89b9Swdenk	Entry Point:  0x00000000
5091c609719bSwdenk
5092c609719bSwdenkTo verify the contents of the image (or check for corruption):
5093c609719bSwdenk
509424ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
509524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5096c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5097c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5098c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5099c609719bSwdenk	Load Address: 0x00000000
510024ee89b9Swdenk	Entry Point:  0x00000000
5101c609719bSwdenk
5102c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
5103c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
5104c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
5105c609719bSwdenkneed to be uncompressed:
5106c609719bSwdenk
5107a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
510824ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
510924ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
5110a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
511124ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
511224ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5113c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5114c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
5115c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
5116c609719bSwdenk	Load Address: 0x00000000
511724ee89b9Swdenk	Entry Point:  0x00000000
5118c609719bSwdenk
5119c609719bSwdenk
5120c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
5121c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
5122c609719bSwdenk
5123c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
5124c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
5125c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
5126c609719bSwdenk	Image Name:   Simple Ramdisk Image
5127c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
5128c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
5129c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
5130c609719bSwdenk	Load Address: 0x00000000
5131c609719bSwdenk	Entry Point:  0x00000000
5132c609719bSwdenk
5133c609719bSwdenk
5134c609719bSwdenkInstalling a Linux Image:
5135c609719bSwdenk-------------------------
5136c609719bSwdenk
5137c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
5138c609719bSwdenkyou must convert the image to S-Record format:
5139c609719bSwdenk
5140c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
5141c609719bSwdenk
5142c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
5143c609719bSwdenkimage header, so the resulting S-Record file will be relative to
5144c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
5145c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
5146c609719bSwdenkcommand.
5147c609719bSwdenk
5148c609719bSwdenkExample: install the image to address 0x40100000 (which on the
5149c609719bSwdenkTQM8xxL is in the first Flash bank):
5150c609719bSwdenk
5151c609719bSwdenk	=> erase 40100000 401FFFFF
5152c609719bSwdenk
5153c609719bSwdenk	.......... done
5154c609719bSwdenk	Erased 8 sectors
5155c609719bSwdenk
5156c609719bSwdenk	=> loads 40100000
5157c609719bSwdenk	## Ready for S-Record download ...
5158c609719bSwdenk	~>examples/image.srec
5159c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5160c609719bSwdenk	...
5161c609719bSwdenk	15989 15990 15991 15992
5162c609719bSwdenk	[file transfer complete]
5163c609719bSwdenk	[connected]
5164c609719bSwdenk	## Start Addr = 0x00000000
5165c609719bSwdenk
5166c609719bSwdenk
5167c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
5168c609719bSwdenkthis includes a checksum verification so you can be sure no data
5169c609719bSwdenkcorruption happened:
5170c609719bSwdenk
5171c609719bSwdenk	=> imi 40100000
5172c609719bSwdenk
5173c609719bSwdenk	## Checking Image at 40100000 ...
5174c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5175c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5176c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5177c609719bSwdenk	   Load Address: 00000000
5178c609719bSwdenk	   Entry Point:	 0000000c
5179c609719bSwdenk	   Verifying Checksum ... OK
5180c609719bSwdenk
5181c609719bSwdenk
5182c609719bSwdenkBoot Linux:
5183c609719bSwdenk-----------
5184c609719bSwdenk
5185c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
5186c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
5187c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
5188c609719bSwdenkparameters. You can check and modify this variable using the
5189c609719bSwdenk"printenv" and "setenv" commands:
5190c609719bSwdenk
5191c609719bSwdenk
5192c609719bSwdenk	=> printenv bootargs
5193c609719bSwdenk	bootargs=root=/dev/ram
5194c609719bSwdenk
5195c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5196c609719bSwdenk
5197c609719bSwdenk	=> printenv bootargs
5198c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5199c609719bSwdenk
5200c609719bSwdenk	=> bootm 40020000
5201c609719bSwdenk	## Booting Linux kernel at 40020000 ...
5202c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
5203c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5204c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
5205c609719bSwdenk	   Load Address: 00000000
5206c609719bSwdenk	   Entry Point:	 0000000c
5207c609719bSwdenk	   Verifying Checksum ... OK
5208c609719bSwdenk	   Uncompressing Kernel Image ... OK
5209c609719bSwdenk	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
5210c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5211c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5212c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5213c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5214c609719bSwdenk	...
5215c609719bSwdenk
521611ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
52177152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
5218c609719bSwdenkformat!) to the "bootm" command:
5219c609719bSwdenk
5220c609719bSwdenk	=> imi 40100000 40200000
5221c609719bSwdenk
5222c609719bSwdenk	## Checking Image at 40100000 ...
5223c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5224c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5225c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5226c609719bSwdenk	   Load Address: 00000000
5227c609719bSwdenk	   Entry Point:	 0000000c
5228c609719bSwdenk	   Verifying Checksum ... OK
5229c609719bSwdenk
5230c609719bSwdenk	## Checking Image at 40200000 ...
5231c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5232c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5233c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5234c609719bSwdenk	   Load Address: 00000000
5235c609719bSwdenk	   Entry Point:	 00000000
5236c609719bSwdenk	   Verifying Checksum ... OK
5237c609719bSwdenk
5238c609719bSwdenk	=> bootm 40100000 40200000
5239c609719bSwdenk	## Booting Linux kernel at 40100000 ...
5240c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5241c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5242c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5243c609719bSwdenk	   Load Address: 00000000
5244c609719bSwdenk	   Entry Point:	 0000000c
5245c609719bSwdenk	   Verifying Checksum ... OK
5246c609719bSwdenk	   Uncompressing Kernel Image ... OK
5247c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
5248c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5249c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5250c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5251c609719bSwdenk	   Load Address: 00000000
5252c609719bSwdenk	   Entry Point:	 00000000
5253c609719bSwdenk	   Verifying Checksum ... OK
5254c609719bSwdenk	   Loading Ramdisk ... OK
5255c609719bSwdenk	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
5256c609719bSwdenk	Boot arguments: root=/dev/ram
5257c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5258c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5259c609719bSwdenk	...
5260c609719bSwdenk	RAMDISK: Compressed image found at block 0
5261c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
5262c609719bSwdenk
5263c609719bSwdenk	bash#
5264c609719bSwdenk
52650267768eSMatthew McClintockBoot Linux and pass a flat device tree:
52660267768eSMatthew McClintock-----------
52670267768eSMatthew McClintock
52680267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
52690267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
52700267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
52710267768eSMatthew McClintockflat device tree:
52720267768eSMatthew McClintock
52730267768eSMatthew McClintock=> print oftaddr
52740267768eSMatthew McClintockoftaddr=0x300000
52750267768eSMatthew McClintock=> print oft
52760267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
52770267768eSMatthew McClintock=> tftp $oftaddr $oft
52780267768eSMatthew McClintockSpeed: 1000, full duplex
52790267768eSMatthew McClintockUsing TSEC0 device
52800267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
52810267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
52820267768eSMatthew McClintockLoad address: 0x300000
52830267768eSMatthew McClintockLoading: #
52840267768eSMatthew McClintockdone
52850267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
52860267768eSMatthew McClintock=> tftp $loadaddr $bootfile
52870267768eSMatthew McClintockSpeed: 1000, full duplex
52880267768eSMatthew McClintockUsing TSEC0 device
52890267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
52900267768eSMatthew McClintockFilename 'uImage'.
52910267768eSMatthew McClintockLoad address: 0x200000
52920267768eSMatthew McClintockLoading:############
52930267768eSMatthew McClintockdone
52940267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
52950267768eSMatthew McClintock=> print loadaddr
52960267768eSMatthew McClintockloadaddr=200000
52970267768eSMatthew McClintock=> print oftaddr
52980267768eSMatthew McClintockoftaddr=0x300000
52990267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
53000267768eSMatthew McClintock## Booting image at 00200000 ...
53010267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
53020267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
53030267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
53040267768eSMatthew McClintock   Load Address: 00000000
53050267768eSMatthew McClintock   Entry Point:	 00000000
53060267768eSMatthew McClintock   Verifying Checksum ... OK
53070267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
53080267768eSMatthew McClintockBooting using flat device tree at 0x300000
53090267768eSMatthew McClintockUsing MPC85xx ADS machine description
53100267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
53110267768eSMatthew McClintock[snip]
53120267768eSMatthew McClintock
53130267768eSMatthew McClintock
53146069ff26SwdenkMore About U-Boot Image Types:
53156069ff26Swdenk------------------------------
53166069ff26Swdenk
53176069ff26SwdenkU-Boot supports the following image types:
53186069ff26Swdenk
53196069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
53206069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
53216069ff26Swdenk	well) you can continue to work in U-Boot after return from
53226069ff26Swdenk	the Standalone Program.
53236069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
53246069ff26Swdenk	will take over control completely. Usually these programs
53256069ff26Swdenk	will install their own set of exception handlers, device
53266069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
53276069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
53286069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
53296069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
53306069ff26Swdenk	being started.
53316069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
53326069ff26Swdenk	(Linux) kernel image and one or more data images like
53336069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
53346069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
53356069ff26Swdenk	server provides just a single image file, but you want to get
53366069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
53376069ff26Swdenk
53386069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
53396069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
53406069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
53416069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
53426069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
53436069ff26Swdenk	a multiple of 4 bytes).
53446069ff26Swdenk
53456069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
53466069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
53476069ff26Swdenk	flash memory.
53486069ff26Swdenk
53496069ff26Swdenk   "Script files" are command sequences that will be executed by
53506069ff26Swdenk	U-Boot's command interpreter; this feature is especially
53516069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
53526069ff26Swdenk	as command interpreter.
53536069ff26Swdenk
535444f074c7SMarek VasutBooting the Linux zImage:
535544f074c7SMarek Vasut-------------------------
535644f074c7SMarek Vasut
535744f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
535844f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
535944f074c7SMarek Vasutas the syntax of "bootm" command.
536044f074c7SMarek Vasut
53618ac28563STom RiniNote, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
5362017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
5363017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
5364017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
5365017e1f3fSMarek Vasut
5366c609719bSwdenk
5367c609719bSwdenkStandalone HOWTO:
5368c609719bSwdenk=================
5369c609719bSwdenk
5370c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
5371c609719bSwdenkrun "standalone" applications, which can use some resources of
5372c609719bSwdenkU-Boot like console I/O functions or interrupt services.
5373c609719bSwdenk
5374c609719bSwdenkTwo simple examples are included with the sources:
5375c609719bSwdenk
5376c609719bSwdenk"Hello World" Demo:
5377c609719bSwdenk-------------------
5378c609719bSwdenk
5379c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
5380c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
5381c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
5382c609719bSwdenklike that:
5383c609719bSwdenk
5384c609719bSwdenk	=> loads
5385c609719bSwdenk	## Ready for S-Record download ...
5386c609719bSwdenk	~>examples/hello_world.srec
5387c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5388c609719bSwdenk	[file transfer complete]
5389c609719bSwdenk	[connected]
5390c609719bSwdenk	## Start Addr = 0x00040004
5391c609719bSwdenk
5392c609719bSwdenk	=> go 40004 Hello World! This is a test.
5393c609719bSwdenk	## Starting application at 0x00040004 ...
5394c609719bSwdenk	Hello World
5395c609719bSwdenk	argc = 7
5396c609719bSwdenk	argv[0] = "40004"
5397c609719bSwdenk	argv[1] = "Hello"
5398c609719bSwdenk	argv[2] = "World!"
5399c609719bSwdenk	argv[3] = "This"
5400c609719bSwdenk	argv[4] = "is"
5401c609719bSwdenk	argv[5] = "a"
5402c609719bSwdenk	argv[6] = "test."
5403c609719bSwdenk	argv[7] = "<NULL>"
5404c609719bSwdenk	Hit any key to exit ...
5405c609719bSwdenk
5406c609719bSwdenk	## Application terminated, rc = 0x0
5407c609719bSwdenk
5408c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
5409c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
5410c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
5411c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
5412c609719bSwdenkcharacter, but this is just a demo program. The application can be
5413c609719bSwdenkcontrolled by the following keys:
5414c609719bSwdenk
5415c609719bSwdenk	? - print current values og the CPM Timer registers
5416c609719bSwdenk	b - enable interrupts and start timer
5417c609719bSwdenk	e - stop timer and disable interrupts
5418c609719bSwdenk	q - quit application
5419c609719bSwdenk
5420c609719bSwdenk	=> loads
5421c609719bSwdenk	## Ready for S-Record download ...
5422c609719bSwdenk	~>examples/timer.srec
5423c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5424c609719bSwdenk	[file transfer complete]
5425c609719bSwdenk	[connected]
5426c609719bSwdenk	## Start Addr = 0x00040004
5427c609719bSwdenk
5428c609719bSwdenk	=> go 40004
5429c609719bSwdenk	## Starting application at 0x00040004 ...
5430c609719bSwdenk	TIMERS=0xfff00980
5431c609719bSwdenk	Using timer 1
5432c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5433c609719bSwdenk
5434c609719bSwdenkHit 'b':
5435c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
5436c609719bSwdenk	Enabling timer
5437c609719bSwdenkHit '?':
5438c609719bSwdenk	[q, b, e, ?] ........
5439c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5440c609719bSwdenkHit '?':
5441c609719bSwdenk	[q, b, e, ?] .
5442c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5443c609719bSwdenkHit '?':
5444c609719bSwdenk	[q, b, e, ?] .
5445c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5446c609719bSwdenkHit '?':
5447c609719bSwdenk	[q, b, e, ?] .
5448c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5449c609719bSwdenkHit 'e':
5450c609719bSwdenk	[q, b, e, ?] ...Stopping timer
5451c609719bSwdenkHit 'q':
5452c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
5453c609719bSwdenk
5454c609719bSwdenk
545585ec0bccSwdenkMinicom warning:
545685ec0bccSwdenk================
545785ec0bccSwdenk
54587152b1d0SwdenkOver time, many people have reported problems when trying to use the
545985ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
546085ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
5461f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
546285ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
5463e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
5464e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5465e53515a2SKarl O. Pincfor help with kermit.
5466e53515a2SKarl O. Pinc
546785ec0bccSwdenk
546852f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
546952f52c14Swdenkconfiguration to your "File transfer protocols" section:
547052f52c14Swdenk
547152f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
547252f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
547352f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
547452f52c14Swdenk
547552f52c14Swdenk
5476c609719bSwdenkNetBSD Notes:
5477c609719bSwdenk=============
5478c609719bSwdenk
5479c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
5480c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
5481c609719bSwdenk
5482c609719bSwdenkBuilding requires a cross environment; it is known to work on
5483c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5484c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
5485c609719bSwdenkNote that the cross-powerpc package does not install include files;
5486c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
5487c609719bSwdenkmissing.  This file has to be installed and patched manually:
5488c609719bSwdenk
5489c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
5490c609719bSwdenk	# mkdir powerpc
5491c609719bSwdenk	# ln -s powerpc machine
5492c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5493c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
5494c609719bSwdenk
5495c609719bSwdenkNative builds *don't* work due to incompatibilities between native
5496c609719bSwdenkand U-Boot include files.
5497c609719bSwdenk
5498c609719bSwdenkBooting assumes that (the first part of) the image booted is a
5499c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
5500c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
5501c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
55022a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5503c609719bSwdenk
5504c609719bSwdenk
5505c609719bSwdenkImplementation Internals:
5506c609719bSwdenk=========================
5507c609719bSwdenk
5508c609719bSwdenkThe following is not intended to be a complete description of every
5509c609719bSwdenkimplementation detail. However, it should help to understand the
5510c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
5511c609719bSwdenkhardware.
5512c609719bSwdenk
5513c609719bSwdenk
5514c609719bSwdenkInitial Stack, Global Data:
5515c609719bSwdenk---------------------------
5516c609719bSwdenk
5517c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
5518c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
5519c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
5520c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
5521c609719bSwdenkis not initialized as zero. To be able to get a C environment working
5522c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
5523c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
5524c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
5525c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
5526c609719bSwdenklocked as (mis-) used as memory, etc.
5527c609719bSwdenk
55287152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
55290668236bSWolfgang Denk	U-Boot mailing list:
553043d9616cSwdenk
553143d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
553243d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
553343d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
553443d9616cSwdenk	...
553543d9616cSwdenk
553643d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
553743d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
553843d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
553943d9616cSwdenk	is that the cache is being used as a temporary supply of
554043d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
554111ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
554243d9616cSwdenk	can see how this works by studying the cache architecture and
554343d9616cSwdenk	operation in the architecture and processor-specific manuals.
554443d9616cSwdenk
554543d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
554643d9616cSwdenk	is another option for the system designer to use as an
554711ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
554843d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
554943d9616cSwdenk	board designers haven't used it for something that would
555043d9616cSwdenk	cause you grief during the initial boot! It is frequently not
555143d9616cSwdenk	used.
555243d9616cSwdenk
55536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
555443d9616cSwdenk	with your processor/board/system design. The default value
555543d9616cSwdenk	you will find in any recent u-boot distribution in
55568a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
555743d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
555843d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
555943d9616cSwdenk	that are supposed to respond to that address! That code in
556043d9616cSwdenk	start.S has been around a while and should work as is when
556143d9616cSwdenk	you get the config right.
556243d9616cSwdenk
556343d9616cSwdenk	-Chris Hallinan
556443d9616cSwdenk	DS4.COM, Inc.
556543d9616cSwdenk
5566c609719bSwdenkIt is essential to remember this, since it has some impact on the C
5567c609719bSwdenkcode for the initialization procedures:
5568c609719bSwdenk
5569c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
5570c609719bSwdenk  to write it.
5571c609719bSwdenk
557211ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
5573c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
55747152b1d0Swdenk  zation is performed later (when relocating to RAM).
5575c609719bSwdenk
5576c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
5577c609719bSwdenk  that.
5578c609719bSwdenk
5579c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
5580c609719bSwdenknormal global data to share information beween the code. But it
5581c609719bSwdenkturned out that the implementation of U-Boot can be greatly
5582c609719bSwdenksimplified by making a global data structure (gd_t) available to all
5583c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
5584c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
5585c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
5586c609719bSwdenkplace a pointer (gd) to the global data into a register which we
5587c609719bSwdenkreserve for this purpose.
5588c609719bSwdenk
55897152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
5590c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
5591c609719bSwdenkGCC's implementation.
5592c609719bSwdenk
5593c609719bSwdenkFor PowerPC, the following registers have specific use:
5594c609719bSwdenk	R1:	stack pointer
5595e7670f6cSWolfgang Denk	R2:	reserved for system use
5596c609719bSwdenk	R3-R4:	parameter passing and return values
5597c609719bSwdenk	R5-R10: parameter passing
5598c609719bSwdenk	R13:	small data area pointer
5599c609719bSwdenk	R30:	GOT pointer
5600c609719bSwdenk	R31:	frame pointer
5601c609719bSwdenk
5602e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
5603e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
5604e6bee808SJoakim Tjernlund	going back and forth between asm and C)
5605c609719bSwdenk
5606e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
5607c609719bSwdenk
5608c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
5609c609719bSwdenk    address of the global data structure is known at compile time),
5610c609719bSwdenk    but it turned out that reserving a register results in somewhat
5611c609719bSwdenk    smaller code - although the code savings are not that big (on
5612c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
5613c609719bSwdenk    624 text + 127 data).
5614c609719bSwdenk
5615c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
56164c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
56174c58eb55SMike Frysinger
5618c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
56194c58eb55SMike Frysinger
5620c609719bSwdenkOn ARM, the following registers are used:
5621c609719bSwdenk
5622c609719bSwdenk	R0:	function argument word/integer result
5623c609719bSwdenk	R1-R3:	function argument word
562412eba1b4SJeroen Hofstee	R9:	platform specific
562512eba1b4SJeroen Hofstee	R10:	stack limit (used only if stack checking is enabled)
5626c609719bSwdenk	R11:	argument (frame) pointer
5627c609719bSwdenk	R12:	temporary workspace
5628c609719bSwdenk	R13:	stack pointer
5629c609719bSwdenk	R14:	link register
5630c609719bSwdenk	R15:	program counter
5631c609719bSwdenk
563212eba1b4SJeroen Hofstee    ==> U-Boot will use R9 to hold a pointer to the global data
563312eba1b4SJeroen Hofstee
563412eba1b4SJeroen Hofstee    Note: on ARM, only R_ARM_RELATIVE relocations are supported.
5635c609719bSwdenk
56360df01fd3SThomas ChouOn Nios II, the ABI is documented here:
56370df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
56380df01fd3SThomas Chou
56390df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
56400df01fd3SThomas Chou
56410df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
56420df01fd3SThomas Chou    to access small data sections, so gp is free.
56430df01fd3SThomas Chou
5644afc1ce82SMacpaul LinOn NDS32, the following registers are used:
5645afc1ce82SMacpaul Lin
5646afc1ce82SMacpaul Lin	R0-R1:	argument/return
5647afc1ce82SMacpaul Lin	R2-R5:	argument
5648afc1ce82SMacpaul Lin	R15:	temporary register for assembler
5649afc1ce82SMacpaul Lin	R16:	trampoline register
5650afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
5651afc1ce82SMacpaul Lin	R29:	global pointer (GP)
5652afc1ce82SMacpaul Lin	R30:	link register (LP)
5653afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
5654afc1ce82SMacpaul Lin	PC:	program counter (PC)
5655afc1ce82SMacpaul Lin
5656afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
5657afc1ce82SMacpaul Lin
5658d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5659d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
5660c609719bSwdenk
5661c609719bSwdenkMemory Management:
5662c609719bSwdenk------------------
5663c609719bSwdenk
5664c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
5665c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
5666c609719bSwdenk
5667c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
5668c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
5669c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
5670c609719bSwdenkphysical memory banks.
5671c609719bSwdenk
5672c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
5673c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5674c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
5675c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
56766d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5677c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
5678c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
5679c609719bSwdenk
5680c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
5681c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
5682c609719bSwdenk
5683c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
5684c609719bSwdenkthis:
5685c609719bSwdenk
5686c609719bSwdenk	0x0000 0000	Exception Vector code
5687c609719bSwdenk	      :
5688c609719bSwdenk	0x0000 1FFF
5689c609719bSwdenk	0x0000 2000	Free for Application Use
5690c609719bSwdenk	      :
5691c609719bSwdenk	      :
5692c609719bSwdenk
5693c609719bSwdenk	      :
5694c609719bSwdenk	      :
5695c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
5696c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
5697c609719bSwdenk	0x00FC 0000	Malloc Arena
5698c609719bSwdenk	      :
5699c609719bSwdenk	0x00FD FFFF
5700c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
5701c609719bSwdenk	...		eventually: LCD or video framebuffer
5702c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
5703c609719bSwdenk	0x00FF FFFF	[End of RAM]
5704c609719bSwdenk
5705c609719bSwdenk
5706c609719bSwdenkSystem Initialization:
5707c609719bSwdenk----------------------
5708c609719bSwdenk
5709c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
571011ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
5711c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
57127152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
5713c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
5714c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
5715c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
5716c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
5717c609719bSwdenkthe caches and the SIU.
5718c609719bSwdenk
5719c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
5720c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
5721c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5722c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5723c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
5724c609719bSwdenksimple memory test is run that determines the size of the SDRAM
5725c609719bSwdenkbanks.
5726c609719bSwdenk
5727c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
57287152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
5729c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
5730c609719bSwdenk0x00000000, with any additional banks following immediately to create
5731c609719bSwdenkcontiguous memory starting from 0.
5732c609719bSwdenk
5733c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
5734c609719bSwdenkand allocates memory for use by malloc() and for the global Board
5735c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
5736c609719bSwdenkpages, and the final stack is set up.
5737c609719bSwdenk
5738c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
5739c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
5740c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
5741c609719bSwdenknew address in RAM.
5742c609719bSwdenk
5743c609719bSwdenk
5744c609719bSwdenkU-Boot Porting Guide:
5745c609719bSwdenk----------------------
5746c609719bSwdenk
5747c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
57486aff3115Swdenklist, October 2002]
5749c609719bSwdenk
5750c609719bSwdenk
5751c609719bSwdenkint main(int argc, char *argv[])
5752c609719bSwdenk{
5753c609719bSwdenk	sighandler_t no_more_time;
5754c609719bSwdenk
5755c609719bSwdenk	signal(SIGALRM, no_more_time);
5756c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5757c609719bSwdenk
5758c609719bSwdenk	if (available_money > available_manpower) {
57596c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
5760c609719bSwdenk		return 0;
5761c609719bSwdenk	}
5762c609719bSwdenk
5763c609719bSwdenk	Download latest U-Boot source;
5764c609719bSwdenk
57650668236bSWolfgang Denk	Subscribe to u-boot mailing list;
57666aff3115Swdenk
57676c3fef28SJerry Van Baren	if (clueless)
5768c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
5769c609719bSwdenk
5770c609719bSwdenk	while (learning) {
5771c609719bSwdenk		Read the README file in the top level directory;
57727cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
57736c3fef28SJerry Van Baren		Read applicable doc/*.README;
5774c609719bSwdenk		Read the source, Luke;
57756c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5776c609719bSwdenk	}
5777c609719bSwdenk
57786c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
57796c3fef28SJerry Van Baren		Buy a BDI3000;
57806c3fef28SJerry Van Baren	else
5781c609719bSwdenk		Add a lot of aggravation and time;
5782c609719bSwdenk
57836c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
57846c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
57856c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
57866c3fef28SJerry Van Baren	} else {
5787c609719bSwdenk		Create your own board support subdirectory;
57886c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
57896c3fef28SJerry Van Baren	}
57906c3fef28SJerry Van Baren	Edit new board/<myboard> files
57916c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5792c609719bSwdenk
57936c3fef28SJerry Van Baren	while (!accepted) {
5794c609719bSwdenk		while (!running) {
5795c609719bSwdenk			do {
5796c609719bSwdenk				Add / modify source code;
5797c609719bSwdenk			} until (compiles);
5798c609719bSwdenk			Debug;
5799c609719bSwdenk			if (clueless)
5800c609719bSwdenk				email("Hi, I am having problems...");
5801c609719bSwdenk		}
58026c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
58036c3fef28SJerry Van Baren		if (reasonable critiques)
58046c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
58056c3fef28SJerry Van Baren		else
58066c3fef28SJerry Van Baren			Defend code as written;
58076c3fef28SJerry Van Baren	}
5808c609719bSwdenk
5809c609719bSwdenk	return 0;
5810c609719bSwdenk}
5811c609719bSwdenk
5812c609719bSwdenkvoid no_more_time (int sig)
5813c609719bSwdenk{
5814c609719bSwdenk      hire_a_guru();
5815c609719bSwdenk}
5816c609719bSwdenk
5817c609719bSwdenk
5818c609719bSwdenkCoding Standards:
5819c609719bSwdenk-----------------
5820c609719bSwdenk
5821c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
58222c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
58237ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
5824c609719bSwdenk
58252c051651SDetlev ZundelSource files originating from a different project (for example the
58262c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
58272c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
58282c051651SDetlev Zundelsources.
58292c051651SDetlev Zundel
58302c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
58312c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
58322c051651SDetlev Zundelin your code.
5833c609719bSwdenk
5834c178d3daSwdenkPlease also stick to the following formatting rules:
5835180d3f74Swdenk- remove any trailing white space
58367ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5837180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
58387ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5839180d3f74Swdenk- do not add trailing empty lines to source files
5840180d3f74Swdenk
5841c609719bSwdenkSubmissions which do not conform to the standards may be returned
5842c609719bSwdenkwith a request to reformat the changes.
5843c609719bSwdenk
5844c609719bSwdenk
5845c609719bSwdenkSubmitting Patches:
5846c609719bSwdenk-------------------
5847c609719bSwdenk
5848c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5849c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5850c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5851c609719bSwdenk
58520d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5853218ca724SWolfgang Denk
58540668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
58550668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
58560668236bSWolfgang Denk
5857c609719bSwdenkWhen you send a patch, please include the following information with
5858c609719bSwdenkit:
5859c609719bSwdenk
5860c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5861c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5862c609719bSwdenk  patch actually fixes something.
5863c609719bSwdenk
5864c609719bSwdenk* For new features: a description of the feature and your
5865c609719bSwdenk  implementation.
5866c609719bSwdenk
5867c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5868c609719bSwdenk
5869c609719bSwdenk* For major contributions, your entry to the CREDITS file
5870c609719bSwdenk
587127af930eSAlbert ARIBAUD* When you add support for a new board, don't forget to add a
587227af930eSAlbert ARIBAUD  maintainer e-mail address to the boards.cfg file, too.
5873c609719bSwdenk
5874c609719bSwdenk* If your patch adds new configuration options, don't forget to
5875c609719bSwdenk  document these in the README file.
5876c609719bSwdenk
5877218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5878218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
58797ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5880218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5881218ca724SWolfgang Denk  with some other mail clients.
5882c609719bSwdenk
5883218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5884218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5885218ca724SWolfgang Denk  GNU diff.
58866dff5529Swdenk
5887218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5888218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5889218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5890218ca724SWolfgang Denk  affected files).
5891218ca724SWolfgang Denk
5892218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5893218ca724SWolfgang Denk  and compressed attachments must not be used.
5894c609719bSwdenk
589552f52c14Swdenk* If one logical set of modifications affects or creates several
589652f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
589752f52c14Swdenk
589852f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
589952f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
590052f52c14Swdenk
590152f52c14Swdenk
5902c609719bSwdenkNotes:
5903c609719bSwdenk
5904c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5905c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5906c609719bSwdenk  for any of the boards.
5907c609719bSwdenk
5908c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5909c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5910c609719bSwdenk  returned with a request to re-formatting / split it.
5911c609719bSwdenk
5912c609719bSwdenk* If you modify existing code, make sure that your new code does not
5913c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5914c609719bSwdenk  When adding new features, these should compile conditionally only
5915c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5916c609719bSwdenk  disabled must not need more memory than the old code without your
5917c609719bSwdenk  modification.
591890dc6704Swdenk
59190668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
59200668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
59210668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
59220668236bSWolfgang Denk  bigger than the size limit should be avoided.
5923