xref: /openbmc/u-boot/README (revision fc54c7fa0addfc0e33b703be0502395920d2926b)
1c609719bSwdenk#
2b75190deSWolfgang Denk# (C) Copyright 2000 - 2012
3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4c609719bSwdenk#
5c609719bSwdenk# See file CREDITS for list of people who contributed to this
6c609719bSwdenk# project.
7c609719bSwdenk#
8c609719bSwdenk# This program is free software; you can redistribute it and/or
9c609719bSwdenk# modify it under the terms of the GNU General Public License as
10c609719bSwdenk# published by the Free Software Foundation; either version 2 of
11c609719bSwdenk# the License, or (at your option) any later version.
12c609719bSwdenk#
13c609719bSwdenk# This program is distributed in the hope that it will be useful,
14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of
15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
16c609719bSwdenk# GNU General Public License for more details.
17c609719bSwdenk#
18c609719bSwdenk# You should have received a copy of the GNU General Public License
19c609719bSwdenk# along with this program; if not, write to the Free Software
20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21c609719bSwdenk# MA 02111-1307 USA
22c609719bSwdenk#
23c609719bSwdenk
24c609719bSwdenkSummary:
25c609719bSwdenk========
26c609719bSwdenk
2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for
28e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other
29e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to
30e86e5a07Swdenkinitialize and test the hardware or to download and run application
31e86e5a07Swdenkcode.
32c609719bSwdenk
33c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of
3424ee89b9Swdenkthe source code originate in the Linux source tree, we have some
3524ee89b9Swdenkheader files in common, and special provision has been made to
36c609719bSwdenksupport booting of Linux images.
37c609719bSwdenk
38c609719bSwdenkSome attention has been paid to make this software easily
39c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are
40c609719bSwdenkimplemented with the same call interface, so that it's very easy to
41c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used
42c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can
43c609719bSwdenkload and run it dynamically.
44c609719bSwdenk
45c609719bSwdenk
46c609719bSwdenkStatus:
47c609719bSwdenk=======
48c609719bSwdenk
49c609719bSwdenkIn general, all boards for which a configuration option exists in the
50c609719bSwdenkMakefile have been tested to some extent and can be considered
51c609719bSwdenk"working". In fact, many of them are used in production systems.
52c609719bSwdenk
53c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out
54218ca724SWolfgang Denkwho contributed the specific port. The MAINTAINERS file lists board
55218ca724SWolfgang Denkmaintainers.
56c609719bSwdenk
57c609719bSwdenk
58c609719bSwdenkWhere to get help:
59c609719bSwdenk==================
60c609719bSwdenk
61c609719bSwdenkIn case you have questions about, problems with or contributions for
62c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
630c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
640c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
650c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
660c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
67c609719bSwdenk
68c609719bSwdenk
69218ca724SWolfgang DenkWhere to get source code:
70218ca724SWolfgang Denk=========================
71218ca724SWolfgang Denk
72218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
73218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
74218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
75218ca724SWolfgang Denk
76218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
7711ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
78218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
79218ca724SWolfgang Denkdirectory.
80218ca724SWolfgang Denk
81d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
82218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
83218ca724SWolfgang Denk
84218ca724SWolfgang Denk
85c609719bSwdenkWhere we come from:
86c609719bSwdenk===================
87c609719bSwdenk
88c609719bSwdenk- start from 8xxrom sources
8924ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
90c609719bSwdenk- clean up code
91c609719bSwdenk- make it easier to add custom boards
92c609719bSwdenk- make it possible to add other [PowerPC] CPUs
93c609719bSwdenk- extend functions, especially:
94c609719bSwdenk  * Provide extended interface to Linux boot loader
95c609719bSwdenk  * S-Record download
96c609719bSwdenk  * network boot
9711ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
9824ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
99c609719bSwdenk- add other CPU families (starting with ARM)
10024ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
1010d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
10224ee89b9Swdenk
10324ee89b9Swdenk
10424ee89b9SwdenkNames and Spelling:
10524ee89b9Swdenk===================
10624ee89b9Swdenk
10724ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
10824ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
10924ee89b9Swdenkin source files etc.). Example:
11024ee89b9Swdenk
11124ee89b9Swdenk	This is the README file for the U-Boot project.
11224ee89b9Swdenk
11324ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
11424ee89b9Swdenk
11524ee89b9Swdenk	include/asm-ppc/u-boot.h
11624ee89b9Swdenk
11724ee89b9Swdenk	#include <asm/u-boot.h>
11824ee89b9Swdenk
11924ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
12024ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
12124ee89b9Swdenk
12224ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
12324ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
124c609719bSwdenk
125c609719bSwdenk
12693f19cc0SwdenkVersioning:
12793f19cc0Swdenk===========
12893f19cc0Swdenk
129360d883aSThomas WeberStarting with the release in October 2008, the names of the releases
130360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning
131360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by
132360d883aSThomas Webernames consisting of the calendar year and month of the release date.
133360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix
134360d883aSThomas Weberreleases in "stable" maintenance trees.
13593f19cc0Swdenk
136360d883aSThomas WeberExamples:
137360d883aSThomas Weber	U-Boot v2009.11	    - Release November 2009
138360d883aSThomas Weber	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
139360d883aSThomas Weber	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
14093f19cc0Swdenk
14193f19cc0Swdenk
142c609719bSwdenkDirectory Hierarchy:
143c609719bSwdenk====================
144c609719bSwdenk
1458d321b81SPeter Tyser/arch			Architecture specific files
1468d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1478d321b81SPeter Tyser    /cpu		CPU specific files
1488d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1498d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1506eb0921aSAndreas Bießmann	/at91		Files specific to Atmel AT91RM9200 CPU
1518d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1528d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1538d321b81SPeter Tyser      /arm925t		Files specific to ARM 925 CPUs
1548d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1558d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1568d321b81SPeter Tyser      /ixp		Files specific to Intel XScale IXP CPUs
1578d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1588d321b81SPeter Tyser      /s3c44b0		Files specific to Samsung S3C44B0 CPUs
1598d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1608d321b81SPeter Tyser    /lib		Architecture specific library files
1618d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1628d321b81SPeter Tyser    /cpu		CPU specific files
1638d321b81SPeter Tyser    /lib		Architecture specific library files
1648d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1658d321b81SPeter Tyser    /cpu		CPU specific files
1668d321b81SPeter Tyser    /lib		Architecture specific library files
167fea25720SGraeme Russ  /x86			Files generic to x86 architecture
1688d321b81SPeter Tyser    /cpu		CPU specific files
1698d321b81SPeter Tyser    /lib		Architecture specific library files
1708d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1718d321b81SPeter Tyser    /cpu		CPU specific files
1728d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1738d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1748d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1758d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1768d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1778d321b81SPeter Tyser    /lib		Architecture specific library files
1788d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1798d321b81SPeter Tyser    /cpu		CPU specific files
1808d321b81SPeter Tyser    /lib		Architecture specific library files
1818d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1828d321b81SPeter Tyser    /cpu		CPU specific files
18392bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
18480421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1858d321b81SPeter Tyser    /lib		Architecture specific library files
186afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
187afc1ce82SMacpaul Lin    /cpu		CPU specific files
188afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
189afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1908d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1918d321b81SPeter Tyser    /cpu		CPU specific files
1928d321b81SPeter Tyser    /lib		Architecture specific library files
193a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1948d321b81SPeter Tyser    /cpu		CPU specific files
1958d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1968d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1978d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1988d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1998d321b81SPeter Tyser      /mpc8220		Files specific to Freescale MPC8220 CPUs
2008d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
2018d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
2028d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
2038d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
2048d321b81SPeter Tyser    /lib		Architecture specific library files
2058d321b81SPeter Tyser  /sh			Files generic to SH architecture
2068d321b81SPeter Tyser    /cpu		CPU specific files
2078d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
2088d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
2098d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
2108d321b81SPeter Tyser    /lib		Architecture specific library files
2118d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2128d321b81SPeter Tyser    /cpu		CPU specific files
2138d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2148d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2158d321b81SPeter Tyser    /lib		Architecture specific library files
2168d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2178d321b81SPeter Tyser/board			Board dependent files
2188d321b81SPeter Tyser/common			Misc architecture independent functions
2198d321b81SPeter Tyser/disk			Code for disk drive partition handling
2208d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2218d321b81SPeter Tyser/drivers		Commonly used device drivers
2228d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2238d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2248d321b81SPeter Tyser/include		Header Files
2258d321b81SPeter Tyser/lib			Files generic to all architectures
2268d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2278d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2288d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2298d321b81SPeter Tyser/net			Networking code
2308d321b81SPeter Tyser/post			Power On Self Test
2318d321b81SPeter Tyser/rtc			Real Time Clock drivers
2328d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
233c609719bSwdenk
234c609719bSwdenkSoftware Configuration:
235c609719bSwdenk=======================
236c609719bSwdenk
237c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
238c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
239c609719bSwdenk
240c609719bSwdenkThere are two classes of configuration variables:
241c609719bSwdenk
242c609719bSwdenk* Configuration _OPTIONS_:
243c609719bSwdenk  These are selectable by the user and have names beginning with
244c609719bSwdenk  "CONFIG_".
245c609719bSwdenk
246c609719bSwdenk* Configuration _SETTINGS_:
247c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
248c609719bSwdenk  you don't know what you're doing; they have names beginning with
2496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
250c609719bSwdenk
251c609719bSwdenkLater we will add a configuration tool - probably similar to or even
252c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
253c609719bSwdenkdo the configuration by hand, which means creating some symbolic
254c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
255c609719bSwdenkas an example here.
256c609719bSwdenk
257c609719bSwdenk
258c609719bSwdenkSelection of Processor Architecture and Board Type:
259c609719bSwdenk---------------------------------------------------
260c609719bSwdenk
261c609719bSwdenkFor all supported boards there are ready-to-use default
262c609719bSwdenkconfigurations available; just type "make <board_name>_config".
263c609719bSwdenk
264c609719bSwdenkExample: For a TQM823L module type:
265c609719bSwdenk
266c609719bSwdenk	cd u-boot
267c609719bSwdenk	make TQM823L_config
268c609719bSwdenk
26911ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
270c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
271c609719bSwdenkdirectory according to the instructions in cogent/README.
272c609719bSwdenk
273c609719bSwdenk
274c609719bSwdenkConfiguration Options:
275c609719bSwdenk----------------------
276c609719bSwdenk
277c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
278c609719bSwdenksuch information is kept in a configuration file
279c609719bSwdenk"include/configs/<board_name>.h".
280c609719bSwdenk
281c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
282c609719bSwdenk"include/configs/TQM823L.h".
283c609719bSwdenk
284c609719bSwdenk
2857f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2867f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2877f6c2cbcSwdenkbuild a config tool - later.
2887f6c2cbcSwdenk
2897f6c2cbcSwdenk
290c609719bSwdenkThe following options need to be configured:
291c609719bSwdenk
2922628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
293c609719bSwdenk
2942628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2956ccec449SWolfgang Denk
2966ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
29709ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
298c609719bSwdenk
299c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
300c609719bSwdenk		Define exactly one of
301c609719bSwdenk		CONFIG_CMA286_60_OLD
302c609719bSwdenk--- FIXME --- not tested yet:
303c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
304c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
305c609719bSwdenk
306c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
307c609719bSwdenk		Define exactly one of
308c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
309c609719bSwdenk
310c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
311c609719bSwdenk		Define one or more of
312c609719bSwdenk		CONFIG_CMA302
313c609719bSwdenk
314c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
315c609719bSwdenk		Define one or more of
316c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
31711ccc33fSMarcel Ziswiler					  the LCD display every second with
318c609719bSwdenk					  a "rotator" |\-/|\-/
319c609719bSwdenk
3202535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3212535d602Swdenk		CONFIG_ADSTYPE
3222535d602Swdenk		Possible values are:
3236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3272535d602Swdenk
328cf946c6dSLei Wen- Marvell Family Member
329cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
330cf946c6dSLei Wen					  multiple fs option at one time
331cf946c6dSLei Wen					  for marvell soc family
332cf946c6dSLei Wen
333c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
334c609719bSwdenk		Define exactly one of
335c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
336c609719bSwdenk
33711ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
33866ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
33966ca92a5Swdenk					  get_gclk_freq() cannot work
3405da627a4Swdenk					  e.g. if there is no 32KHz
3415da627a4Swdenk					  reference PIT/RTC clock
34266ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
34366ca92a5Swdenk					  or XTAL/EXTAL)
344c609719bSwdenk
34566ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
34866ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
34975d1ea7fSwdenk			See doc/README.MPC866
35075d1ea7fSwdenk
3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
35275d1ea7fSwdenk
35375d1ea7fSwdenk		Define this to measure the actual CPU clock instead
35475d1ea7fSwdenk		of relying on the correctness of the configured
35575d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
35675d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
35775d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
35975d1ea7fSwdenk
360506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
361506f3918SHeiko Schocher
362506f3918SHeiko Schocher		Define this option if you want to enable the
363506f3918SHeiko Schocher		ICache only when Code runs from RAM.
364506f3918SHeiko Schocher
36566412c63SKumar Gala- 85xx CPU Options:
36666412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36766412c63SKumar Gala
36866412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
36966412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
37066412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
37166412c63SKumar Gala
3728f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3738f29084aSKumar Gala
3748f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3758f29084aSKumar Gala		tree nodes for the given platform.
3768f29084aSKumar Gala
377afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
378afa6b551SPrabhakar Kushwaha
379afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
380afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
381afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
382afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
383afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
384afa6b551SPrabhakar Kushwaha		purpose.
385afa6b551SPrabhakar Kushwaha
3866cb461b4SDaniel Schwierzeck- Generic CPU options:
3876cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
3886cb461b4SDaniel Schwierzeck
3896cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
3906cb461b4SDaniel Schwierzeck		values is arch specific.
3916cb461b4SDaniel Schwierzeck
3920b953ffcSMarkus Klotzbuecher- Intel Monahans options:
3936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
3940b953ffcSMarkus Klotzbuecher
3950b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
3960b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
3970b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
3980b953ffcSMarkus Klotzbuecher
3996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
4000b953ffcSMarkus Klotzbuecher
4010b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
4020b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
4030b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
4040b953ffcSMarkus Klotzbuecher		by this value.
4050b953ffcSMarkus Klotzbuecher
40692bbd64eSDaniel Schwierzeck- MIPS CPU options:
40792bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
40892bbd64eSDaniel Schwierzeck
40992bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
41092bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
41192bbd64eSDaniel Schwierzeck		relocation.
41292bbd64eSDaniel Schwierzeck
41392bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
41492bbd64eSDaniel Schwierzeck
41592bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
41692bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
41792bbd64eSDaniel Schwierzeck		Possible values are:
41892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
41992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
42092bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
42192bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
42292bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
42392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
42492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
42592bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
42692bbd64eSDaniel Schwierzeck
42792bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
42892bbd64eSDaniel Schwierzeck
42992bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
43092bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
43192bbd64eSDaniel Schwierzeck
43292bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
43392bbd64eSDaniel Schwierzeck
43492bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
43592bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
43692bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
43792bbd64eSDaniel Schwierzeck
438b67d8816SChristian Riesch- ARM options:
439b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
440b67d8816SChristian Riesch
441b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
442b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
443b67d8816SChristian Riesch
4445356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
4455356f545SAneesh V
4465356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
4475356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
4485356f545SAneesh V		better code density. For ARM architectures that support
4495356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
4505356f545SAneesh V		GCC.
4515356f545SAneesh V
4525da627a4Swdenk- Linux Kernel Interface:
453c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
454c609719bSwdenk
455c609719bSwdenk		U-Boot stores all clock information in Hz
456c609719bSwdenk		internally. For binary compatibility with older Linux
457c609719bSwdenk		kernels (which expect the clocks passed in the
458c609719bSwdenk		bd_info data to be in MHz) the environment variable
459c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
460c609719bSwdenk		converts clock data to MHZ before passing it to the
461c609719bSwdenk		Linux kernel.
462c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
463c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
464c609719bSwdenk		default environment.
465c609719bSwdenk
4665da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
4675da627a4Swdenk
46811ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
4695da627a4Swdenk		expect it to be in bytes, others in MB.
4705da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
4715da627a4Swdenk
472fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
473f57f70aaSWolfgang Denk
474f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
475213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
476213bf8c8SGerald Van Baren		concepts).
477213bf8c8SGerald Van Baren
478213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
479213bf8c8SGerald Van Baren		 * New libfdt-based support
480213bf8c8SGerald Van Baren		 * Adds the "fdt" command
4813bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
482213bf8c8SGerald Van Baren
483b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
484b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
485b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
486b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
487f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
488c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
489f57f70aaSWolfgang Denk
49011ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
49111ccc33fSMarcel Ziswiler		addresses
4923bb342fcSKim Phillips
4934e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
4944e253137SKumar Gala
4954e253137SKumar Gala		Board code has addition modification that it wants to make
4964e253137SKumar Gala		to the flat device tree before handing it off to the kernel
4976705d81eSwdenk
4980267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
4990267768eSMatthew McClintock
50011ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
5010267768eSMatthew McClintock		param header, the default value is zero if undefined.
5020267768eSMatthew McClintock
5033887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
5043887c3fbSHeiko Schocher
5053887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
5063887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
5073887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
5083887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
5093887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
5103887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
5113887c3fbSHeiko Schocher
5127eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
5137eb29398SIgor Grinberg
5147eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
5157eb29398SIgor Grinberg		machine type and must be used to specify the machine type
5167eb29398SIgor Grinberg		number as it appears in the ARM machine registry
5177eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
5187eb29398SIgor Grinberg		Only boards that have multiple machine types supported
5197eb29398SIgor Grinberg		in a single configuration file and the machine type is
5207eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
5217eb29398SIgor Grinberg
5220b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5230b2f4ecaSNiklaus Giger
5240b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5250b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5260b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5270b2f4ecaSNiklaus Giger
5280b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5290b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5300b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5310b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5320b2f4ecaSNiklaus Giger
5330b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5340b2f4ecaSNiklaus Giger
5350b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5360b2f4ecaSNiklaus Giger
5370b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5380b2f4ecaSNiklaus Giger		the defaults discussed just above.
5390b2f4ecaSNiklaus Giger
5402c451f78SAneesh V- Cache Configuration:
5412c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
5422c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
5432c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
5442c451f78SAneesh V
54593bc2193SAneesh V- Cache Configuration for ARM:
54693bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
54793bc2193SAneesh V				      controller
54893bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
54993bc2193SAneesh V					controller register space
55093bc2193SAneesh V
5516705d81eSwdenk- Serial Ports:
55248d0192fSAndreas Engel		CONFIG_PL010_SERIAL
5536705d81eSwdenk
5546705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
5556705d81eSwdenk
55648d0192fSAndreas Engel		CONFIG_PL011_SERIAL
5576705d81eSwdenk
5586705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
5596705d81eSwdenk
5606705d81eSwdenk		CONFIG_PL011_CLOCK
5616705d81eSwdenk
5626705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
5636705d81eSwdenk		the clock speed of the UARTs.
5646705d81eSwdenk
5656705d81eSwdenk		CONFIG_PL01x_PORTS
5666705d81eSwdenk
5676705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
5686705d81eSwdenk		define this to a list of base addresses for each (supported)
5696705d81eSwdenk		port. See e.g. include/configs/versatile.h
5706705d81eSwdenk
571910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
572910f1ae3SJohn Rigby
573910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
574910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
575910f1ae3SJohn Rigby		this variable to initialize the extra register.
576910f1ae3SJohn Rigby
577910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
578910f1ae3SJohn Rigby
579910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
580910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
581910f1ae3SJohn Rigby		variable to flush the UART at init time.
582910f1ae3SJohn Rigby
5836705d81eSwdenk
584c609719bSwdenk- Console Interface:
585c609719bSwdenk		Depending on board, define exactly one serial port
586c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
587c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
588c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
589c609719bSwdenk
590c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
591c609719bSwdenk		port routines must be defined elsewhere
592c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
593c609719bSwdenk
594c609719bSwdenk		CONFIG_CFB_CONSOLE
595c609719bSwdenk		Enables console device for a color framebuffer. Needs following
596c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
597c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
598c609719bSwdenk						(default big endian)
599c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
600c609719bSwdenk						rectangle fill
601c609719bSwdenk						(cf. smiLynxEM)
602c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
603c609719bSwdenk						bit-blit (cf. smiLynxEM)
604c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
605c609719bSwdenk						(cols=pitch)
606c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
607c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
608c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
609c609719bSwdenk						(0-5, cf. cfb_console.c)
610c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
611c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
612c609719bSwdenk						(i.e. i8042_kbd_init())
613c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
614c609719bSwdenk						(i.e. i8042_tstc)
615c609719bSwdenk			VIDEO_GETC_FCT		get char fct
616c609719bSwdenk						(i.e. i8042_getc)
617c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
618c609719bSwdenk						(requires blink timer
619c609719bSwdenk						cf. i8042.c)
6206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
621c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
622c609719bSwdenk						upper right corner
623602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
624c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
625c609719bSwdenk						upper left corner
626a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
627a6c7ad2fSwdenk						linux_logo.h for logo.
628a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
629c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
63011ccc33fSMarcel Ziswiler						additional board info beside
631c609719bSwdenk						the logo
632c609719bSwdenk
633c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
634c609719bSwdenk		default i/o. Serial console can be forced with
635c609719bSwdenk		environment 'console=serial'.
636c609719bSwdenk
637a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
638a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
639a3ad8e26Swdenk		the "silent" environment variable. See
640a3ad8e26Swdenk		doc/README.silent for more information.
641a3ad8e26Swdenk
642c609719bSwdenk- Console Baudrate:
643c609719bSwdenk		CONFIG_BAUDRATE - in bps
644c609719bSwdenk		Select one of the baudrates listed in
6456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
6466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
647c609719bSwdenk
648c92fac91SHeiko Schocher- Console Rx buffer length
649c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
650c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
6512b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
652c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
653c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
654c92fac91SHeiko Schocher		the SMC.
655c92fac91SHeiko Schocher
6569558b48aSGraeme Russ- Pre-Console Buffer:
6579558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
6589558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
6599558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
6609558b48aSGraeme Russ		buffer any console messages prior to the console being
6619558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
6629558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
6639558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
6649558b48aSGraeme Russ		bytes are output before the console is initialised, the
6659558b48aSGraeme Russ		earlier bytes are discarded.
6669558b48aSGraeme Russ
6679558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
6689558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
6699558b48aSGraeme Russ
670046a37bdSSonny Rao- Safe printf() functions
671046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
672046a37bdSSonny Rao		the printf() functions. These are defined in
673046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
674046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
675046a37bdSSonny Rao		If this option is not given then these functions will
676046a37bdSSonny Rao		silently discard their buffer size argument - this means
677046a37bdSSonny Rao		you are not getting any overflow checking in this case.
678046a37bdSSonny Rao
679c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
680c609719bSwdenk		Delay before automatically booting the default image;
681c609719bSwdenk		set to -1 to disable autoboot.
682c609719bSwdenk
683c609719bSwdenk		See doc/README.autoboot for these options that
684c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
685c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
686c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
687c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
688c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
689c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
690c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
691c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
692c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
693c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
694c609719bSwdenk		CONFIG_RESET_TO_RETRY
695c609719bSwdenk
696c609719bSwdenk- Autoboot Command:
697c609719bSwdenk		CONFIG_BOOTCOMMAND
698c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
699c609719bSwdenk		define a command string that is automatically executed
700c609719bSwdenk		when no character is read on the console interface
701c609719bSwdenk		within "Boot Delay" after reset.
702c609719bSwdenk
703c609719bSwdenk		CONFIG_BOOTARGS
704c609719bSwdenk		This can be used to pass arguments to the bootm
705c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
706c609719bSwdenk		environment value "bootargs".
707c609719bSwdenk
708c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
709c609719bSwdenk		The value of these goes into the environment as
710c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
711c609719bSwdenk		as a convenience, when switching between booting from
71211ccc33fSMarcel Ziswiler		RAM and NFS.
713c609719bSwdenk
714c609719bSwdenk- Pre-Boot Commands:
715c609719bSwdenk		CONFIG_PREBOOT
716c609719bSwdenk
717c609719bSwdenk		When this option is #defined, the existence of the
718c609719bSwdenk		environment variable "preboot" will be checked
719c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
720c609719bSwdenk		countdown and/or running the auto-boot command resp.
721c609719bSwdenk		entering interactive mode.
722c609719bSwdenk
723c609719bSwdenk		This feature is especially useful when "preboot" is
724c609719bSwdenk		automatically generated or modified. For an example
725c609719bSwdenk		see the LWMON board specific code: here "preboot" is
726c609719bSwdenk		modified when the user holds down a certain
727c609719bSwdenk		combination of keys on the (special) keyboard when
728c609719bSwdenk		booting the systems
729c609719bSwdenk
730c609719bSwdenk- Serial Download Echo Mode:
731c609719bSwdenk		CONFIG_LOADS_ECHO
732c609719bSwdenk		If defined to 1, all characters received during a
733c609719bSwdenk		serial download (using the "loads" command) are
734c609719bSwdenk		echoed back. This might be needed by some terminal
735c609719bSwdenk		emulations (like "cu"), but may as well just take
736c609719bSwdenk		time on others. This setting #define's the initial
737c609719bSwdenk		value of the "loads_echo" environment variable.
738c609719bSwdenk
739602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
740c609719bSwdenk		CONFIG_KGDB_BAUDRATE
741c609719bSwdenk		Select one of the baudrates listed in
7426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
743c609719bSwdenk
744c609719bSwdenk- Monitor Functions:
745602ad3b3SJon Loeliger		Monitor commands can be included or excluded
746602ad3b3SJon Loeliger		from the build by using the #include files
747602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
748602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
749602ad3b3SJon Loeliger		and augmenting with additional #define's
750602ad3b3SJon Loeliger		for wanted commands.
751c609719bSwdenk
752602ad3b3SJon Loeliger		The default command configuration includes all commands
753602ad3b3SJon Loeliger		except those marked below with a "*".
754602ad3b3SJon Loeliger
755602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
756602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
757602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
758602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
759602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
760602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
761602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
762602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
763710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
764602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
765602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
766602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
767a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
768a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
769a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
770a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
771602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
772602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
773246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
774602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
775602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
7760c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
777bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
778602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
779602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
780602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
781602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
782602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
783a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
784a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
785602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
786602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
787602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
788602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
789602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
790602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
7910c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
792602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
793602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
794602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
795602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
7961ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
797d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
798d22c338eSJoe Hershberger					  (169.254.*.*)
799602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
800602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
80102c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
80202c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
803602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
80456523f12Swdenk					  loop, loopw, mtest
805602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
806602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
807602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
80868d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
809602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
810602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
811e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
812e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
813602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
814602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
815602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
816602ad3b3SJon Loeliger					  host
817602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
818602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
819602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
820602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
821602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
822602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
823602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
824602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
825602ad3b3SJon Loeliger					  (4xx only)
826f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
827c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
82802c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
82974de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
830602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
8317a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
8321fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
833ca366d0eSChe-liang Chiou		CONFIG_CMD_TIME		* run command and report execution time
834602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
835602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
836c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
837c609719bSwdenk
838c609719bSwdenk
839c609719bSwdenk		EXAMPLE: If you want all functions except of network
840c609719bSwdenk		support you can write:
841c609719bSwdenk
842602ad3b3SJon Loeliger		#include "config_cmd_all.h"
843602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
844c609719bSwdenk
845213bf8c8SGerald Van Baren	Other Commands:
846213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
847c609719bSwdenk
848c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
849602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
850c609719bSwdenk		what you (and your U-Boot users) are doing. Data
851c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
852c609719bSwdenk		8260 (where accesses to the IMMR region must be
853c609719bSwdenk		uncached), and it cannot be disabled on all other
854c609719bSwdenk		systems where we (mis-) use the data cache to hold an
855c609719bSwdenk		initial stack and some data.
856c609719bSwdenk
857c609719bSwdenk
858c609719bSwdenk		XXX - this list needs to get updated!
859c609719bSwdenk
86045ba8077SSimon Glass- Device tree:
86145ba8077SSimon Glass		CONFIG_OF_CONTROL
86245ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
86345ba8077SSimon Glass		to configure its devices, instead of relying on statically
86445ba8077SSimon Glass		compiled #defines in the board file. This option is
86545ba8077SSimon Glass		experimental and only available on a few boards. The device
86645ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
86745ba8077SSimon Glass
8682c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
8692c0f79e4SSimon Glass		be done using one of the two options below:
870bbb0b128SSimon Glass
871bbb0b128SSimon Glass		CONFIG_OF_EMBED
872bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
873bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
874bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
875bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
876bbb0b128SSimon Glass		the global data structure as gd->blob.
87745ba8077SSimon Glass
8782c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
8792c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
8802c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
8812c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
8822c0f79e4SSimon Glass
8832c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
8842c0f79e4SSimon Glass
8852c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
8862c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
8872c0f79e4SSimon Glass		still use the individual files if you need something more
8882c0f79e4SSimon Glass		exotic.
8892c0f79e4SSimon Glass
890c609719bSwdenk- Watchdog:
891c609719bSwdenk		CONFIG_WATCHDOG
892c609719bSwdenk		If this variable is defined, it enables watchdog
8936abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
8946abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
8956abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
8966abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
8976abe6fb6SDetlev Zundel		available, then no further board specific code should
8986abe6fb6SDetlev Zundel		be needed to use it.
8996abe6fb6SDetlev Zundel
9006abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
9016abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
9026abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
9036abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
904c609719bSwdenk
905c1551ea8Sstroese- U-Boot Version:
906c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
907c1551ea8Sstroese		If this variable is defined, an environment variable
908c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
909c1551ea8Sstroese		version as printed by the "version" command.
910c1551ea8Sstroese		This variable is readonly.
911c1551ea8Sstroese
912c609719bSwdenk- Real-Time Clock:
913c609719bSwdenk
914602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
915c609719bSwdenk		has to be selected, too. Define exactly one of the
916c609719bSwdenk		following options:
917c609719bSwdenk
918c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
919c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
9204e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
921c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
9221cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
923c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
9247f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
9253bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
9269536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
9274c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
9286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
92971d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
93071d19f30SHeiko Schocher					  RV3029 RTC.
931c609719bSwdenk
932b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
933b37c7e5eSwdenk		must also be configured. See I2C Support, below.
934b37c7e5eSwdenk
935e92739d3SPeter Tyser- GPIO Support:
936e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
937e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
938e92739d3SPeter Tyser
9395dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
9405dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
9415dec49caSChris Packham		pins supported by a particular chip.
9425dec49caSChris Packham
943e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
944e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
945e92739d3SPeter Tyser
946c609719bSwdenk- Timestamp Support:
947c609719bSwdenk
948c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
949c609719bSwdenk		(date and time) of an image is printed by image
950c609719bSwdenk		commands like bootm or iminfo. This option is
951602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
952c609719bSwdenk
953c609719bSwdenk- Partition Support:
954c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
95507f3d789Srichardretanubun		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
956c609719bSwdenk
957602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
958218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
959218ca724SWolfgang Denk		least one partition type as well.
960c609719bSwdenk
961c609719bSwdenk- IDE Reset method:
9624d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
9634d13cbadSwdenk		board configurations files but used nowhere!
964c609719bSwdenk
9654d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
9664d13cbadSwdenk		be performed by calling the function
9674d13cbadSwdenk			ide_set_reset(int reset)
9684d13cbadSwdenk		which has to be defined in a board specific file
969c609719bSwdenk
970c609719bSwdenk- ATAPI Support:
971c609719bSwdenk		CONFIG_ATAPI
972c609719bSwdenk
973c609719bSwdenk		Set this to enable ATAPI support.
974c609719bSwdenk
975c40b2956Swdenk- LBA48 Support
976c40b2956Swdenk		CONFIG_LBA48
977c40b2956Swdenk
978c40b2956Swdenk		Set this to enable support for disks larger than 137GB
9794b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
980c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
981c40b2956Swdenk		support disks up to 2.1TB.
982c40b2956Swdenk
9836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
984c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
985c40b2956Swdenk			Default is 32bit.
986c40b2956Swdenk
987c609719bSwdenk- SCSI Support:
988c609719bSwdenk		At the moment only there is only support for the
989c609719bSwdenk		SYM53C8XX SCSI controller; define
990c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
991c609719bSwdenk
9926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
9936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
9946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
995c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
996c609719bSwdenk		devices.
9976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
998c609719bSwdenk
999c609719bSwdenk- NETWORK Support (PCI):
1000682011ffSwdenk		CONFIG_E1000
1001ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1002ce5207e1SKyle Moffett
1003ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1004ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1005ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1006ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1007ce5207e1SKyle Moffett
1008ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1009ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1010ce5207e1SKyle Moffett		example with the "sspi" command.
1011ce5207e1SKyle Moffett
1012ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1013ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1014ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1015682011ffSwdenk
1016ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
101711ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1018ac3315c2SAndre Schwarz
1019c609719bSwdenk		CONFIG_EEPRO100
1020c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
102111ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1022c609719bSwdenk		write routine for first time initialisation.
1023c609719bSwdenk
1024c609719bSwdenk		CONFIG_TULIP
1025c609719bSwdenk		Support for Digital 2114x chips.
1026c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1027c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1028c609719bSwdenk
1029c609719bSwdenk		CONFIG_NATSEMI
1030c609719bSwdenk		Support for National dp83815 chips.
1031c609719bSwdenk
1032c609719bSwdenk		CONFIG_NS8382X
1033c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1034c609719bSwdenk
103545219c46Swdenk- NETWORK Support (other):
103645219c46Swdenk
1037c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1038c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1039c041e9d2SJens Scharsig
1040c041e9d2SJens Scharsig			CONFIG_RMII
1041c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1042c041e9d2SJens Scharsig
1043c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1044c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1045c041e9d2SJens Scharsig			The driver doen't show link status messages.
1046c041e9d2SJens Scharsig
1047efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1048efdd7319SRob Herring		Support for the Calxeda XGMAC device
1049efdd7319SRob Herring
105045219c46Swdenk		CONFIG_DRIVER_LAN91C96
105145219c46Swdenk		Support for SMSC's LAN91C96 chips.
105245219c46Swdenk
105345219c46Swdenk			CONFIG_LAN91C96_BASE
105445219c46Swdenk			Define this to hold the physical address
105545219c46Swdenk			of the LAN91C96's I/O space
105645219c46Swdenk
105745219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
105845219c46Swdenk			Define this to enable 32 bit addressing
105945219c46Swdenk
1060f39748aeSwdenk		CONFIG_DRIVER_SMC91111
1061f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1062f39748aeSwdenk
1063f39748aeSwdenk			CONFIG_SMC91111_BASE
1064f39748aeSwdenk			Define this to hold the physical address
1065f39748aeSwdenk			of the device (I/O space)
1066f39748aeSwdenk
1067f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1068f39748aeSwdenk			Define this if data bus is 32 bits
1069f39748aeSwdenk
1070f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1071f39748aeSwdenk			Define this to use i/o functions instead of macros
1072f39748aeSwdenk			(some hardware wont work with macros)
1073f39748aeSwdenk
1074dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1075dc02badaSHeiko Schocher		Support for davinci emac
1076dc02badaSHeiko Schocher
1077dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1078dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1079dc02badaSHeiko Schocher
1080b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1081b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1082b3dbf4a5SMacpaul Lin
1083b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1084b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1085b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1086b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1087b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1088b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1089b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1090b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1091b3dbf4a5SMacpaul Lin
1092c2fff331SMike Rapoport		CONFIG_SMC911X
1093557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1094557b377dSJens Gehrlein
1095c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1096557b377dSJens Gehrlein			Define this to hold the physical address
1097557b377dSJens Gehrlein			of the device (I/O space)
1098557b377dSJens Gehrlein
1099c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1100557b377dSJens Gehrlein			Define this if data bus is 32 bits
1101557b377dSJens Gehrlein
1102c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1103557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1104557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1105c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1106557b377dSJens Gehrlein
11073d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
11083d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
11093d0075faSYoshihiro Shimoda
11103d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
11113d0075faSYoshihiro Shimoda			Define the number of ports to be used
11123d0075faSYoshihiro Shimoda
11133d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
11143d0075faSYoshihiro Shimoda			Define the ETH PHY's address
11153d0075faSYoshihiro Shimoda
111668260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
111768260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
111868260aabSYoshihiro Shimoda
11195e124724SVadim Bendebury- TPM Support:
11205e124724SVadim Bendebury		CONFIG_GENERIC_LPC_TPM
11215e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
11225e124724SVadim Bendebury		per system is supported at this time.
11235e124724SVadim Bendebury
11245e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
11255e124724SVadim Bendebury			Base address where the generic TPM device is mapped
11265e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
11275e124724SVadim Bendebury			0xfed40000.
11285e124724SVadim Bendebury
1129c609719bSwdenk- USB Support:
1130c609719bSwdenk		At the moment only the UHCI host controller is
11314d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1132c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1133c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
113430d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1135c609719bSwdenk		storage devices.
1136c609719bSwdenk		Note:
1137c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1138c609719bSwdenk		(TEAC FD-05PUB).
11394d13cbadSwdenk		MPC5200 USB requires additional defines:
11404d13cbadSwdenk			CONFIG_USB_CLOCK
11414d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1142307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1143307ecb6dSEric Millbrandt				for USB on PSC3
11444d13cbadSwdenk			CONFIG_USB_CONFIG
11454d13cbadSwdenk				for differential drivers: 0x00001000
11464d13cbadSwdenk				for single ended drivers: 0x00005000
1147307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1148307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
11496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1150fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1151fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
11524d13cbadSwdenk
11539ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
11549ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
11559ab4ce22SSimon Glass
115616c8d5e7SWolfgang Denk- USB Device:
115716c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
115816c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
115916c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
116011ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
116116c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
116216c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
116316c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
116416c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
116516c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
116616c8d5e7SWolfgang Denk		a Linux host by
116716c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
116816c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
116916c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
117016c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
117116c8d5e7SWolfgang Denk
117216c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
117316c8d5e7SWolfgang Denk			Define this to build a UDC device
117416c8d5e7SWolfgang Denk
117516c8d5e7SWolfgang Denk			CONFIG_USB_TTY
117616c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
117716c8d5e7SWolfgang Denk			talk to the UDC device
117816c8d5e7SWolfgang Denk
1179f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1180f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1181f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1182f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1183f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1184f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1185f9da0f89SVipin KUMAR			speed.
1186f9da0f89SVipin KUMAR
11876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
118816c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
118916c8d5e7SWolfgang Denk			be set to usbtty.
119016c8d5e7SWolfgang Denk
119116c8d5e7SWolfgang Denk			mpc8xx:
11926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
119316c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
11946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
119516c8d5e7SWolfgang Denk
11966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
119716c8d5e7SWolfgang Denk				Derive USB clock from brgclk
11986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
119916c8d5e7SWolfgang Denk
120016c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
120116c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
120216c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
120316c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
120416c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
120516c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
120616c8d5e7SWolfgang Denk
120716c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
120816c8d5e7SWolfgang Denk			Define this string as the name of your company for
120916c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
121016c8d5e7SWolfgang Denk
121116c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
121216c8d5e7SWolfgang Denk			Define this string as the name of your product
121316c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
121416c8d5e7SWolfgang Denk
121516c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
121616c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
121716c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
121816c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
121916c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
122016c8d5e7SWolfgang Denk
122116c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
122216c8d5e7SWolfgang Denk			Define this as the unique Product ID
122316c8d5e7SWolfgang Denk			for your device
122416c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1225c609719bSwdenk
1226d70a560fSIgor Grinberg- ULPI Layer Support:
1227d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1228d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1229d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1230d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1231d70a560fSIgor Grinberg		viewport is supported.
1232d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1233d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
1234c609719bSwdenk
1235c609719bSwdenk- MMC Support:
1236c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1237c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1238c609719bSwdenk		accessed from the boot prompt by mapping the device
1239c609719bSwdenk		to physical memory similar to flash. Command line is
1240602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1241602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1242c609719bSwdenk
1243afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1244afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1245afb35666SYoshihiro Shimoda
1246afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1247afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1248afb35666SYoshihiro Shimoda
1249afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1250afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1251afb35666SYoshihiro Shimoda
12526705d81eSwdenk- Journaling Flash filesystem support:
12536705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
12546705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
12556705d81eSwdenk		Define these for a default partition on a NAND device
12566705d81eSwdenk
12576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
12586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
12596705d81eSwdenk		Define these for a default partition on a NOR device
12606705d81eSwdenk
12616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
12626705d81eSwdenk		Define this to create an own partition. You have to provide a
12636705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
12646705d81eSwdenk
12656705d81eSwdenk		If you define only one JFFS2 partition you may also want to
12666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
12676705d81eSwdenk		to disable the command chpart. This is the default when you
12686705d81eSwdenk		have not defined a custom partition
12696705d81eSwdenk
1270c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1271c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1272656f4c65SDonggeun Kim
1273656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1274656f4c65SDonggeun Kim		file in FAT formatted partition.
1275656f4c65SDonggeun Kim
1276656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1277656f4c65SDonggeun Kim		user to write files to FAT.
1278c30a15e5SDonggeun Kim
1279c609719bSwdenk- Keyboard Support:
1280c609719bSwdenk		CONFIG_ISA_KEYBOARD
1281c609719bSwdenk
1282c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1283c609719bSwdenk		support
1284c609719bSwdenk
1285c609719bSwdenk		CONFIG_I8042_KBD
1286c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1287c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1288c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1289c609719bSwdenk		for cfb_console. Supports cursor blinking.
1290c609719bSwdenk
1291c609719bSwdenk- Video support:
1292c609719bSwdenk		CONFIG_VIDEO
1293c609719bSwdenk
1294c609719bSwdenk		Define this to enable video support (for output to
1295c609719bSwdenk		video).
1296c609719bSwdenk
1297c609719bSwdenk		CONFIG_VIDEO_CT69000
1298c609719bSwdenk
1299c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1300c609719bSwdenk
1301c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1302eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1303eeb1b77bSwdenk		video output is selected via environment 'videoout'
1304eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1305eeb1b77bSwdenk		assumed.
1306c609719bSwdenk
1307eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
130811ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1309eeb1b77bSwdenk		are possible:
1310eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1311eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1312eeb1b77bSwdenk
1313eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1314eeb1b77bSwdenk		-------------+---------------------------------------------
1315eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1316eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1317eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1318eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1319eeb1b77bSwdenk		-------------+---------------------------------------------
1320c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1321c609719bSwdenk
1322eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
13237817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1324eeb1b77bSwdenk
1325eeb1b77bSwdenk
1326a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1327a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1328a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1329a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1330a6c7ad2fSwdenk
13317d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
13327d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
13337d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
13347d3053fbSTimur Tabi		support, and should also define these other macros:
13357d3053fbSTimur Tabi
13367d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
13377d3053fbSTimur Tabi			CONFIG_VIDEO
13387d3053fbSTimur Tabi			CONFIG_CMD_BMP
13397d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
13407d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
13417d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
13427d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
13437d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
13447d3053fbSTimur Tabi
1345ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1346ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1347ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1348ba8e76bdSTimur Tabi		description of this variable.
13497d3053fbSTimur Tabi
1350682011ffSwdenk- Keyboard Support:
1351682011ffSwdenk		CONFIG_KEYBOARD
1352682011ffSwdenk
1353682011ffSwdenk		Define this to enable a custom keyboard support.
1354682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1355682011ffSwdenk		defined in your board-specific files.
1356682011ffSwdenk		The only board using this so far is RBC823.
1357a6c7ad2fSwdenk
1358c609719bSwdenk- LCD Support:	CONFIG_LCD
1359c609719bSwdenk
1360c609719bSwdenk		Define this to enable LCD support (for output to LCD
1361c609719bSwdenk		display); also select one of the supported displays
1362c609719bSwdenk		by defining one of these:
1363c609719bSwdenk
136439cf4804SStelian Pop		CONFIG_ATMEL_LCD:
136539cf4804SStelian Pop
136639cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
136739cf4804SStelian Pop
1368fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1369c609719bSwdenk
1370fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1371c609719bSwdenk
1372fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1373c609719bSwdenk
1374fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1375fd3103bbSwdenk			Active, color, single scan.
1376fd3103bbSwdenk
1377fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1378fd3103bbSwdenk
1379fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1380c609719bSwdenk			Active, color, single scan.
1381c609719bSwdenk
1382c609719bSwdenk		CONFIG_SHARP_16x9
1383c609719bSwdenk
1384c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1385c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1386c609719bSwdenk
1387c609719bSwdenk		CONFIG_SHARP_LQ64D341
1388c609719bSwdenk
1389c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1390c609719bSwdenk			Active, color, single scan.
1391c609719bSwdenk
1392c609719bSwdenk		CONFIG_HLD1045
1393c609719bSwdenk
1394c609719bSwdenk			HLD1045 display, 640x480.
1395c609719bSwdenk			Active, color, single scan.
1396c609719bSwdenk
1397c609719bSwdenk		CONFIG_OPTREX_BW
1398c609719bSwdenk
1399c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1400c609719bSwdenk			or
1401c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1402c609719bSwdenk			or
1403c609719bSwdenk			Hitachi	 SP14Q002
1404c609719bSwdenk
1405c609719bSwdenk			320x240. Black & white.
1406c609719bSwdenk
1407c609719bSwdenk		Normally display is black on white background; define
14086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1409c609719bSwdenk
14107152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1411d791b1dcSwdenk
1412d791b1dcSwdenk		If this option is set, the environment is checked for
1413d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1414d791b1dcSwdenk		of logo, copyright and system information on the LCD
1415e94d2cd9Swdenk		is suppressed and the BMP image at the address
1416d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1417d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1418d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1419d791b1dcSwdenk		loaded very quickly after power-on.
1420d791b1dcSwdenk
14211ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
14221ca298ceSMatthias Weisser
14231ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
14241ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
14251ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
14261ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
14271ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
14281ca298ceSMatthias Weisser		specify 'm' for centering the image.
14291ca298ceSMatthias Weisser
14301ca298ceSMatthias Weisser		Example:
14311ca298ceSMatthias Weisser		setenv splashpos m,m
14321ca298ceSMatthias Weisser			=> image at center of screen
14331ca298ceSMatthias Weisser
14341ca298ceSMatthias Weisser		setenv splashpos 30,20
14351ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
14361ca298ceSMatthias Weisser
14371ca298ceSMatthias Weisser		setenv splashpos -10,m
14381ca298ceSMatthias Weisser			=> vertically centered image
14391ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
14401ca298ceSMatthias Weisser
144198f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
144298f4a3dfSStefan Roese
144398f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
144498f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
144598f4a3dfSStefan Roese		splashscreen support or the bmp command.
144698f4a3dfSStefan Roese
1447d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1448d5011762SAnatolij Gustschin
1449d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1450d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1451d5011762SAnatolij Gustschin		bmp command.
1452d5011762SAnatolij Gustschin
1453c29fdfc1Swdenk- Compression support:
1454c29fdfc1Swdenk		CONFIG_BZIP2
1455c29fdfc1Swdenk
1456c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1457c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1458c29fdfc1Swdenk		compressed images are supported.
1459c29fdfc1Swdenk
1460c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
14616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1462c29fdfc1Swdenk		be at least 4MB.
1463d791b1dcSwdenk
1464fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1465fc9c1727SLuigi 'Comio' Mantellini
1466fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1467fc9c1727SLuigi 'Comio' Mantellini		images is included.
1468fc9c1727SLuigi 'Comio' Mantellini
1469fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1470fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1471fc9c1727SLuigi 'Comio' Mantellini		formula:
1472fc9c1727SLuigi 'Comio' Mantellini
1473fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1474fc9c1727SLuigi 'Comio' Mantellini
1475fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1476fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1477fc9c1727SLuigi 'Comio' Mantellini
1478fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1479fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1480fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1481fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1482fc9c1727SLuigi 'Comio' Mantellini
1483fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1484fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
14856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1486fc9c1727SLuigi 'Comio' Mantellini
148717ea1177Swdenk- MII/PHY support:
148817ea1177Swdenk		CONFIG_PHY_ADDR
148917ea1177Swdenk
149017ea1177Swdenk		The address of PHY on MII bus.
149117ea1177Swdenk
149217ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
149317ea1177Swdenk
149417ea1177Swdenk		The clock frequency of the MII bus
149517ea1177Swdenk
149617ea1177Swdenk		CONFIG_PHY_GIGE
149717ea1177Swdenk
149817ea1177Swdenk		If this option is set, support for speed/duplex
149911ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
150017ea1177Swdenk
150117ea1177Swdenk		CONFIG_PHY_RESET_DELAY
150217ea1177Swdenk
150317ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
150417ea1177Swdenk		reset before any MII register access is possible.
150517ea1177Swdenk		For such PHY, set this option to the usec delay
150617ea1177Swdenk		required. (minimum 300usec for LXT971A)
150717ea1177Swdenk
150817ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
150917ea1177Swdenk
151017ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
151117ea1177Swdenk		command issued before MII status register can be read
151217ea1177Swdenk
1513c609719bSwdenk- Ethernet address:
1514c609719bSwdenk		CONFIG_ETHADDR
1515c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1516c609719bSwdenk		CONFIG_ETH2ADDR
1517c609719bSwdenk		CONFIG_ETH3ADDR
1518c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1519c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1520c609719bSwdenk
152111ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
152211ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1523c609719bSwdenk		is not determined automatically.
1524c609719bSwdenk
1525c609719bSwdenk- IP address:
1526c609719bSwdenk		CONFIG_IPADDR
1527c609719bSwdenk
1528c609719bSwdenk		Define a default value for the IP address to use for
152911ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1530c609719bSwdenk		determined through e.g. bootp.
15311ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1532c609719bSwdenk
1533c609719bSwdenk- Server IP address:
1534c609719bSwdenk		CONFIG_SERVERIP
1535c609719bSwdenk
1536c609719bSwdenk		Defines a default value for the IP address of a TFTP
1537c609719bSwdenk		server to contact when using the "tftboot" command.
15381ebcd654SWolfgang Denk		(Environment variable "serverip")
1539c609719bSwdenk
154097cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
154197cfe861SRobin Getz
154297cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
154397cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
154497cfe861SRobin Getz
15451ebcd654SWolfgang Denk- Gateway IP address:
15461ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
15471ebcd654SWolfgang Denk
15481ebcd654SWolfgang Denk		Defines a default value for the IP address of the
15491ebcd654SWolfgang Denk		default router where packets to other networks are
15501ebcd654SWolfgang Denk		sent to.
15511ebcd654SWolfgang Denk		(Environment variable "gatewayip")
15521ebcd654SWolfgang Denk
15531ebcd654SWolfgang Denk- Subnet mask:
15541ebcd654SWolfgang Denk		CONFIG_NETMASK
15551ebcd654SWolfgang Denk
15561ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
15571ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
15581ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
15591ebcd654SWolfgang Denk		forwarded through a router.
15601ebcd654SWolfgang Denk		(Environment variable "netmask")
15611ebcd654SWolfgang Denk
156253a5c424SDavid Updegraff- Multicast TFTP Mode:
156353a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
156453a5c424SDavid Updegraff
156553a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
156653a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
156711ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
156853a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
156953a5c424SDavid Updegraff		multicast group.
157053a5c424SDavid Updegraff
1571c609719bSwdenk- BOOTP Recovery Mode:
1572c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1573c609719bSwdenk
1574c609719bSwdenk		If you have many targets in a network that try to
1575c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1576c609719bSwdenk		systems send out BOOTP requests at precisely the same
1577c609719bSwdenk		moment (which would happen for instance at recovery
1578c609719bSwdenk		from a power failure, when all systems will try to
1579c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1580c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1581c609719bSwdenk		inserted before sending out BOOTP requests. The
15826c33c785SWolfgang Denk		following delays are inserted then:
1583c609719bSwdenk
1584c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1585c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1586c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1587c609719bSwdenk		4th and following
1588c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1589c609719bSwdenk
1590fe389a82Sstroese- DHCP Advanced Options:
15911fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
15921fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1593fe389a82Sstroese
15941fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
15951fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
15961fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
15971fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
15981fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
15991fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
16001fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
16011fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
16021fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
16031fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
16041fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
16051fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
16062c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1607fe389a82Sstroese
16085d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
16095d110f0aSWilson Callan		environment variable, not the BOOTP server.
1610fe389a82Sstroese
16112c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
16122c00e099SJoe Hershberger		after the configured retry count, the call will fail
16132c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
16142c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
16152c00e099SJoe Hershberger		is not available.
16162c00e099SJoe Hershberger
1617fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1618fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1619fe389a82Sstroese		than one DNS serverip is offered to the client.
1620fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1621fe389a82Sstroese		serverip will be stored in the additional environment
1622fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1623fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
16241fe80d79SJon Loeliger		is defined.
1625fe389a82Sstroese
1626fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1627fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1628fe389a82Sstroese		need the hostname of the DHCP requester.
16295d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
16301fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
16311fe80d79SJon Loeliger		option 12 to the DHCP server.
1632fe389a82Sstroese
1633d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1634d9a2f416SAras Vaichas
1635d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1636d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1637d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1638d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1639d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1640d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1641d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1642d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1643d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1644d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1645d9a2f416SAras Vaichas		this delay.
1646d9a2f416SAras Vaichas
1647d22c338eSJoe Hershberger - Link-local IP address negotiation:
1648d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1649d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1650d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1651d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1652d22c338eSJoe Hershberger
1653d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1654d22c338eSJoe Hershberger
1655a3d991bdSwdenk - CDP Options:
1656a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1657a3d991bdSwdenk
1658a3d991bdSwdenk		The device id used in CDP trigger frames.
1659a3d991bdSwdenk
1660a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1661a3d991bdSwdenk
1662a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1663a3d991bdSwdenk		of the device.
1664a3d991bdSwdenk
1665a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1666a3d991bdSwdenk
1667a3d991bdSwdenk		A printf format string which contains the ascii name of
1668a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
166911ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1670a3d991bdSwdenk
1671a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1672a3d991bdSwdenk
1673a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1674a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1675a3d991bdSwdenk
1676a3d991bdSwdenk		CONFIG_CDP_VERSION
1677a3d991bdSwdenk
1678a3d991bdSwdenk		An ascii string containing the version of the software.
1679a3d991bdSwdenk
1680a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1681a3d991bdSwdenk
1682a3d991bdSwdenk		An ascii string containing the name of the platform.
1683a3d991bdSwdenk
1684a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1685a3d991bdSwdenk
1686a3d991bdSwdenk		A 32bit integer sent on the trigger.
1687a3d991bdSwdenk
1688a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1689a3d991bdSwdenk
1690a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1691a3d991bdSwdenk		device in .1 of milliwatts.
1692a3d991bdSwdenk
1693a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1694a3d991bdSwdenk
1695a3d991bdSwdenk		A byte containing the id of the VLAN.
1696a3d991bdSwdenk
1697c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1698c609719bSwdenk
1699c609719bSwdenk		Several configurations allow to display the current
1700c609719bSwdenk		status using a LED. For instance, the LED will blink
1701c609719bSwdenk		fast while running U-Boot code, stop blinking as
1702c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1703c609719bSwdenk		start blinking slow once the Linux kernel is running
1704c609719bSwdenk		(supported by a status LED driver in the Linux
1705c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1706c609719bSwdenk		feature in U-Boot.
1707c609719bSwdenk
1708c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1709c609719bSwdenk
1710c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1711c609719bSwdenk		on those systems that support this (optional)
1712c609719bSwdenk		feature, like the TQM8xxL modules.
1713c609719bSwdenk
1714c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1715c609719bSwdenk
1716b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1717b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
171811ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1719c609719bSwdenk
1720b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1721602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1722b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1723b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1724c609719bSwdenk		command line interface.
1725c609719bSwdenk
1726bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1727c609719bSwdenk
1728b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1729b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1730b37c7e5eSwdenk		support for I2C.
1731c609719bSwdenk
1732b37c7e5eSwdenk		There are several other quantities that must also be
1733b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1734c609719bSwdenk
17356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1736b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
17376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
173811ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1739c609719bSwdenk
17408d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1741a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
17428d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
17438d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
17448d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1745b37c7e5eSwdenk
17465da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
17475da71efaSEric Millbrandt
17485da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
17495da71efaSEric Millbrandt		chips might think that the current transfer is still
17505da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
17515da71efaSEric Millbrandt		commands until the slave device responds.
17525da71efaSEric Millbrandt
1753b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1754b37c7e5eSwdenk
1755b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1756b37c7e5eSwdenk		then the following macros need to be defined (examples are
1757b37c7e5eSwdenk		from include/configs/lwmon.h):
1758c609719bSwdenk
1759c609719bSwdenk		I2C_INIT
1760c609719bSwdenk
1761b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1762c609719bSwdenk		controller or configure ports.
1763c609719bSwdenk
1764b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1765b37c7e5eSwdenk
1766c609719bSwdenk		I2C_PORT
1767c609719bSwdenk
1768c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1769c609719bSwdenk		assumes both bits are on the same port). Valid values
1770c609719bSwdenk		are 0..3 for ports A..D.
1771c609719bSwdenk
1772c609719bSwdenk		I2C_ACTIVE
1773c609719bSwdenk
1774c609719bSwdenk		The code necessary to make the I2C data line active
1775c609719bSwdenk		(driven).  If the data line is open collector, this
1776c609719bSwdenk		define can be null.
1777c609719bSwdenk
1778b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1779b37c7e5eSwdenk
1780c609719bSwdenk		I2C_TRISTATE
1781c609719bSwdenk
1782c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1783c609719bSwdenk		(inactive).  If the data line is open collector, this
1784c609719bSwdenk		define can be null.
1785c609719bSwdenk
1786b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1787b37c7e5eSwdenk
1788c609719bSwdenk		I2C_READ
1789c609719bSwdenk
1790c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1791c609719bSwdenk		FALSE if it is low.
1792c609719bSwdenk
1793b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1794b37c7e5eSwdenk
1795c609719bSwdenk		I2C_SDA(bit)
1796c609719bSwdenk
1797c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1798c609719bSwdenk		is FALSE, it clears it (low).
1799c609719bSwdenk
1800b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1801b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1802b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1803b37c7e5eSwdenk
1804c609719bSwdenk		I2C_SCL(bit)
1805c609719bSwdenk
1806c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1807c609719bSwdenk		is FALSE, it clears it (low).
1808c609719bSwdenk
1809b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1810b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1811b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1812b37c7e5eSwdenk
1813c609719bSwdenk		I2C_DELAY
1814c609719bSwdenk
1815c609719bSwdenk		This delay is invoked four times per clock cycle so this
1816c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1817b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1818b37c7e5eSwdenk		like:
1819b37c7e5eSwdenk
1820b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1821c609719bSwdenk
1822793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1823793b5726SMike Frysinger
1824793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
1825793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
1826793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
1827793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
1828793b5726SMike Frysinger
1829793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
1830793b5726SMike Frysinger		the generic GPIO functions.
1831793b5726SMike Frysinger
18326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
183347cd00faSwdenk
183447cd00faSwdenk		When a board is reset during an i2c bus transfer
183547cd00faSwdenk		chips might think that the current transfer is still
183647cd00faSwdenk		in progress. On some boards it is possible to access
183747cd00faSwdenk		the i2c SCLK line directly, either by using the
183847cd00faSwdenk		processor pin as a GPIO or by having a second pin
183947cd00faSwdenk		connected to the bus. If this option is defined a
184047cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
184147cd00faSwdenk		is run early in the boot sequence.
184247cd00faSwdenk
184326a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
184426a33504SRichard Retanubun
184526a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
184626a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
184726a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
184826a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
184926a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
185026a33504SRichard Retanubun		controller provide such a method. It is called at the end of
185126a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
185226a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
185326a33504SRichard Retanubun
185417ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
185517ea1177Swdenk
185617ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
185717ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
185817ea1177Swdenk		variable "i2cfast". (see also i2cfast)
185917ea1177Swdenk
1860bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1861bb99ad6dSBen Warren
1862bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1863bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
1864bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
1865bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1866bb99ad6dSBen Warren
18676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
1868bb99ad6dSBen Warren
1869bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
18700f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
18710f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
18720f89c54bSPeter Tyser		a 1D array of device addresses
1873bb99ad6dSBen Warren
1874bb99ad6dSBen Warren		e.g.
1875bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
18766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
1877bb99ad6dSBen Warren
1878bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1879bb99ad6dSBen Warren
1880bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
18816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1882bb99ad6dSBen Warren
1883bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1884bb99ad6dSBen Warren
18856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
1886be5e6181STimur Tabi
1887be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1888be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1889be5e6181STimur Tabi
18906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
18910dc018ecSStefan Roese
18920dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
18930dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
18940dc018ecSStefan Roese
18956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
18960dc018ecSStefan Roese
18970dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
18980dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
18990dc018ecSStefan Roese
19006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
19019ebbb54fSVictor Gallardo
19029ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
19039ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
19049ebbb54fSVictor Gallardo		specified DTT device.
19059ebbb54fSVictor Gallardo
1906be5e6181STimur Tabi		CONFIG_FSL_I2C
1907be5e6181STimur Tabi
1908be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
19097817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1910be5e6181STimur Tabi
191167b23a32SHeiko Schocher		CONFIG_I2C_MUX
191267b23a32SHeiko Schocher
191367b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
191467b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
191567b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
191667b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
191767b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
191867b23a32SHeiko Schocher		the muxes to activate this new "bus".
191967b23a32SHeiko Schocher
192067b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
192167b23a32SHeiko Schocher		feature!
192267b23a32SHeiko Schocher
192367b23a32SHeiko Schocher		Example:
192467b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
192567b23a32SHeiko Schocher			The First mux with address 70 and channel 6
192667b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
192767b23a32SHeiko Schocher
192867b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
192967b23a32SHeiko Schocher
193067b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
193167b23a32SHeiko Schocher		of I2C Busses with muxes:
193267b23a32SHeiko Schocher
193367b23a32SHeiko Schocher		=> i2c bus
193467b23a32SHeiko Schocher		Busses reached over muxes:
193567b23a32SHeiko Schocher		Bus ID: 2
193667b23a32SHeiko Schocher		  reached over Mux(es):
193767b23a32SHeiko Schocher		    pca9544a@70 ch: 4
193867b23a32SHeiko Schocher		Bus ID: 3
193967b23a32SHeiko Schocher		  reached over Mux(es):
194067b23a32SHeiko Schocher		    pca9544a@70 ch: 6
194167b23a32SHeiko Schocher		    pca9544a@71 ch: 4
194267b23a32SHeiko Schocher		=>
194367b23a32SHeiko Schocher
194467b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
1945f9a78b8dSMichael Jones		u-boot first sends the command to the mux@70 to enable
1946f9a78b8dSMichael Jones		channel 6, and then the command to the mux@71 to enable
194767b23a32SHeiko Schocher		the channel 4.
194867b23a32SHeiko Schocher
194967b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
1950f9a78b8dSMichael Jones		usual to communicate with your I2C devices behind
195167b23a32SHeiko Schocher		the 2 muxes.
195267b23a32SHeiko Schocher
195367b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
195467b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
195567b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
195667b23a32SHeiko Schocher		to add this option to other architectures.
195767b23a32SHeiko Schocher
19582ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
19592ac6985aSAndrew Dyer
19602ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
19612ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
19622ac6985aSAndrew Dyer		between writing the address pointer and reading the
19632ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
19642ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
19652ac6985aSAndrew Dyer		devices can use either method, but some require one or
19662ac6985aSAndrew Dyer		the other.
1967be5e6181STimur Tabi
1968c609719bSwdenk- SPI Support:	CONFIG_SPI
1969c609719bSwdenk
1970c609719bSwdenk		Enables SPI driver (so far only tested with
1971c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1972c609719bSwdenk		D/As on the SACSng board)
1973c609719bSwdenk
19746639562eSYoshihiro Shimoda		CONFIG_SH_SPI
19756639562eSYoshihiro Shimoda
19766639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
19776639562eSYoshihiro Shimoda		only SH7757 is supported.
19786639562eSYoshihiro Shimoda
1979c609719bSwdenk		CONFIG_SPI_X
1980c609719bSwdenk
1981c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1982c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1983c609719bSwdenk
1984c609719bSwdenk		CONFIG_SOFT_SPI
1985c609719bSwdenk
1986c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1987c609719bSwdenk		using hardware support. This is a general purpose
1988c609719bSwdenk		driver that only requires three general I/O port pins
1989c609719bSwdenk		(two outputs, one input) to function. If this is
1990c609719bSwdenk		defined, the board configuration must define several
1991c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1992c609719bSwdenk		an example, see include/configs/sacsng.h.
1993c609719bSwdenk
199404a9e118SBen Warren		CONFIG_HARD_SPI
199504a9e118SBen Warren
199604a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
199704a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
199804a9e118SBen Warren		must define a list of chip-select function pointers.
199904a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
200004a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
200104a9e118SBen Warren
200238254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
200338254f45SGuennadi Liakhovetski
200438254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
20052e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
200638254f45SGuennadi Liakhovetski
20070133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
20080133502eSMatthias Fuchs
20090133502eSMatthias Fuchs		Enables FPGA subsystem.
20100133502eSMatthias Fuchs
20110133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
20120133502eSMatthias Fuchs
20130133502eSMatthias Fuchs		Enables support for specific chip vendors.
20140133502eSMatthias Fuchs		(ALTERA, XILINX)
20150133502eSMatthias Fuchs
20160133502eSMatthias Fuchs		CONFIG_FPGA_<family>
20170133502eSMatthias Fuchs
20180133502eSMatthias Fuchs		Enables support for FPGA family.
20190133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
20200133502eSMatthias Fuchs
20210133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2022c609719bSwdenk
2023c609719bSwdenk		Specify the number of FPGA devices to support.
2024c609719bSwdenk
20256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2026c609719bSwdenk
2027c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2028c609719bSwdenk
20296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2030c609719bSwdenk
2031c609719bSwdenk		Enable checks on FPGA configuration interface busy
2032c609719bSwdenk		status by the configuration function. This option
2033c609719bSwdenk		will require a board or device specific function to
2034c609719bSwdenk		be written.
2035c609719bSwdenk
2036c609719bSwdenk		CONFIG_FPGA_DELAY
2037c609719bSwdenk
2038c609719bSwdenk		If defined, a function that provides delays in the FPGA
2039c609719bSwdenk		configuration driver.
2040c609719bSwdenk
20416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2042c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2043c609719bSwdenk
20446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2045c609719bSwdenk
2046c609719bSwdenk		Check for configuration errors during FPGA bitfile
2047c609719bSwdenk		loading. For example, abort during Virtex II
2048c609719bSwdenk		configuration if the INIT_B line goes low (which
2049c609719bSwdenk		indicated a CRC error).
2050c609719bSwdenk
20516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2052c609719bSwdenk
2053c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2054c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2055c609719bSwdenk		FPGA configuration sequence. The default time is 500
205611ccc33fSMarcel Ziswiler		ms.
2057c609719bSwdenk
20586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2059c609719bSwdenk
2060c609719bSwdenk		Maximum time to wait for BUSY to deassert during
206111ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2062c609719bSwdenk
20636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2064c609719bSwdenk
2065c609719bSwdenk		Time to wait after FPGA configuration. The default is
206611ccc33fSMarcel Ziswiler		200 ms.
2067c609719bSwdenk
2068c609719bSwdenk- Configuration Management:
2069c609719bSwdenk		CONFIG_IDENT_STRING
2070c609719bSwdenk
2071c609719bSwdenk		If defined, this string will be added to the U-Boot
2072c609719bSwdenk		version information (U_BOOT_VERSION)
2073c609719bSwdenk
2074c609719bSwdenk- Vendor Parameter Protection:
2075c609719bSwdenk
2076c609719bSwdenk		U-Boot considers the values of the environment
2077c609719bSwdenk		variables "serial#" (Board Serial Number) and
20787152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2079c609719bSwdenk		are set once by the board vendor / manufacturer, and
2080c609719bSwdenk		protects these variables from casual modification by
2081c609719bSwdenk		the user. Once set, these variables are read-only,
2082c609719bSwdenk		and write or delete attempts are rejected. You can
208311ccc33fSMarcel Ziswiler		change this behaviour:
2084c609719bSwdenk
2085c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2086c609719bSwdenk		file, the write protection for vendor parameters is
208747cd00faSwdenk		completely disabled. Anybody can change or delete
2088c609719bSwdenk		these parameters.
2089c609719bSwdenk
2090c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2091c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
209211ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2093c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2094c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2095c609719bSwdenk		read-only.]
2096c609719bSwdenk
2097c609719bSwdenk- Protected RAM:
2098c609719bSwdenk		CONFIG_PRAM
2099c609719bSwdenk
2100c609719bSwdenk		Define this variable to enable the reservation of
2101c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2102c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2103c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2104c609719bSwdenk		this default value by defining an environment
2105c609719bSwdenk		variable "pram" to the number of kB you want to
2106c609719bSwdenk		reserve. Note that the board info structure will
2107c609719bSwdenk		still show the full amount of RAM. If pRAM is
2108c609719bSwdenk		reserved, a new environment variable "mem" will
2109c609719bSwdenk		automatically be defined to hold the amount of
2110c609719bSwdenk		remaining RAM in a form that can be passed as boot
2111c609719bSwdenk		argument to Linux, for instance like that:
2112c609719bSwdenk
2113fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2114c609719bSwdenk			saveenv
2115c609719bSwdenk
2116c609719bSwdenk		This way you can tell Linux not to use this memory,
2117c609719bSwdenk		either, which results in a memory region that will
2118c609719bSwdenk		not be affected by reboots.
2119c609719bSwdenk
2120c609719bSwdenk		*WARNING* If your board configuration uses automatic
2121c609719bSwdenk		detection of the RAM size, you must make sure that
2122c609719bSwdenk		this memory test is non-destructive. So far, the
2123c609719bSwdenk		following board configurations are known to be
2124c609719bSwdenk		"pRAM-clean":
2125c609719bSwdenk
2126c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
2127c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
2128544d97e9SWolfgang Denk			FLAGADM, TQM8260
2129c609719bSwdenk
2130c609719bSwdenk- Error Recovery:
2131c609719bSwdenk		CONFIG_PANIC_HANG
2132c609719bSwdenk
2133c609719bSwdenk		Define this variable to stop the system in case of a
2134c609719bSwdenk		fatal error, so that you have to reset it manually.
2135c609719bSwdenk		This is probably NOT a good idea for an embedded
213611ccc33fSMarcel Ziswiler		system where you want the system to reboot
2137c609719bSwdenk		automatically as fast as possible, but it may be
2138c609719bSwdenk		useful during development since you can try to debug
2139c609719bSwdenk		the conditions that lead to the situation.
2140c609719bSwdenk
2141c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2142c609719bSwdenk
2143c609719bSwdenk		This variable defines the number of retries for
2144c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2145c609719bSwdenk		before giving up the operation. If not defined, a
2146c609719bSwdenk		default value of 5 is used.
2147c609719bSwdenk
214840cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
214940cb90eeSGuennadi Liakhovetski
215040cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
215140cb90eeSGuennadi Liakhovetski
215248a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
215348a3e999STetsuyuki Kobayashi
215448a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
215548a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
215648a3e999STetsuyuki Kobayashi		try longer timeout such as
215748a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
215848a3e999STetsuyuki Kobayashi
2159c609719bSwdenk- Command Interpreter:
21608078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
216104a85b3bSwdenk
216204a85b3bSwdenk		Enable auto completion of commands using TAB.
216304a85b3bSwdenk
21648078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
21658078f1a5SWolfgang Denk		for the "hush" shell.
21668078f1a5SWolfgang Denk
21678078f1a5SWolfgang Denk
21686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2169c609719bSwdenk
2170c609719bSwdenk		Define this variable to enable the "hush" shell (from
2171c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2172c609719bSwdenk		powerful command line syntax like
2173c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2174c609719bSwdenk		constructs ("shell scripts").
2175c609719bSwdenk
2176c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2177c609719bSwdenk		with a somewhat smaller memory footprint.
2178c609719bSwdenk
2179c609719bSwdenk
21806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2181c609719bSwdenk
2182c609719bSwdenk		This defines the secondary prompt string, which is
2183c609719bSwdenk		printed when the command interpreter needs more input
2184c609719bSwdenk		to complete a command. Usually "> ".
2185c609719bSwdenk
2186c609719bSwdenk	Note:
2187c609719bSwdenk
2188c609719bSwdenk		In the current implementation, the local variables
2189c609719bSwdenk		space and global environment variables space are
2190c609719bSwdenk		separated. Local variables are those you define by
21913b57fe0aSwdenk		simply typing `name=value'. To access a local
2192c609719bSwdenk		variable later on, you have write `$name' or
21933b57fe0aSwdenk		`${name}'; to execute the contents of a variable
21943b57fe0aSwdenk		directly type `$name' at the command prompt.
2195c609719bSwdenk
2196c609719bSwdenk		Global environment variables are those you use
2197c609719bSwdenk		setenv/printenv to work with. To run a command stored
2198c609719bSwdenk		in such a variable, you need to use the run command,
2199c609719bSwdenk		and you must not use the '$' sign to access them.
2200c609719bSwdenk
2201c609719bSwdenk		To store commands and special characters in a
2202c609719bSwdenk		variable, please use double quotation marks
2203c609719bSwdenk		surrounding the whole text of the variable, instead
2204c609719bSwdenk		of the backslashes before semicolons and special
2205c609719bSwdenk		symbols.
2206c609719bSwdenk
2207aa0c71acSWolfgang Denk- Commandline Editing and History:
2208aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2209aa0c71acSWolfgang Denk
221011ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2211aa0c71acSWolfgang Denk		commandline input operations
2212aa0c71acSWolfgang Denk
2213a8c7c708Swdenk- Default Environment:
2214c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2215c609719bSwdenk
2216c609719bSwdenk		Define this to contain any number of null terminated
2217c609719bSwdenk		strings (variable = value pairs) that will be part of
22187152b1d0Swdenk		the default environment compiled into the boot image.
22192262cfeeSwdenk
2220c609719bSwdenk		For example, place something like this in your
2221c609719bSwdenk		board's config file:
2222c609719bSwdenk
2223c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2224c609719bSwdenk			"myvar1=value1\0" \
2225c609719bSwdenk			"myvar2=value2\0"
2226c609719bSwdenk
2227c609719bSwdenk		Warning: This method is based on knowledge about the
2228c609719bSwdenk		internal format how the environment is stored by the
22292262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2230c609719bSwdenk		interface! Although it is unlikely that this format
22317152b1d0Swdenk		will change soon, there is no guarantee either.
2232c609719bSwdenk		You better know what you are doing here.
2233c609719bSwdenk
2234c609719bSwdenk		Note: overly (ab)use of the default environment is
2235c609719bSwdenk		discouraged. Make sure to check other ways to preset
223674de7aefSWolfgang Denk		the environment like the "source" command or the
2237c609719bSwdenk		boot command first.
2238c609719bSwdenk
22395e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
22405e724ca2SStephen Warren
22415e724ca2SStephen Warren		Define this in order to add variables describing the
22425e724ca2SStephen Warren		U-Boot build configuration to the default environment.
22435e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
22445e724ca2SStephen Warren
22455e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
22465e724ca2SStephen Warren
22475e724ca2SStephen Warren		- CONFIG_SYS_ARCH
22485e724ca2SStephen Warren		- CONFIG_SYS_CPU
22495e724ca2SStephen Warren		- CONFIG_SYS_BOARD
22505e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
22515e724ca2SStephen Warren		- CONFIG_SYS_SOC
22525e724ca2SStephen Warren
2253a8c7c708Swdenk- DataFlash Support:
22542abbe075Swdenk		CONFIG_HAS_DATAFLASH
22552abbe075Swdenk
22562abbe075Swdenk		Defining this option enables DataFlash features and
22572abbe075Swdenk		allows to read/write in Dataflash via the standard
22582abbe075Swdenk		commands cp, md...
22592abbe075Swdenk
2260f61ec45eSEric Nelson- Serial Flash support
2261f61ec45eSEric Nelson		CONFIG_CMD_SF
2262f61ec45eSEric Nelson
2263f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2264f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2265f61ec45eSEric Nelson
2266f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2267f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2268f61ec45eSEric Nelson		commands.
2269f61ec45eSEric Nelson
2270f61ec45eSEric Nelson		The following defaults may be provided by the platform
2271f61ec45eSEric Nelson		to handle the common case when only a single serial
2272f61ec45eSEric Nelson		flash is present on the system.
2273f61ec45eSEric Nelson
2274f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2275f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2276f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2277f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2278f61ec45eSEric Nelson
22793f85ce27Swdenk- SystemACE Support:
22803f85ce27Swdenk		CONFIG_SYSTEMACE
22813f85ce27Swdenk
22823f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
22833f85ce27Swdenk		chips attached via some sort of local bus. The address
228411ccc33fSMarcel Ziswiler		of the chip must also be defined in the
22856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
22863f85ce27Swdenk
22873f85ce27Swdenk		#define CONFIG_SYSTEMACE
22886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
22893f85ce27Swdenk
22903f85ce27Swdenk		When SystemACE support is added, the "ace" device type
22913f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
22923f85ce27Swdenk
2293ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2294ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2295ecb0ccd9SWolfgang Denk
229628cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2297ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
229828cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2299ecb0ccd9SWolfgang Denk		number generator is used.
2300ecb0ccd9SWolfgang Denk
230128cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
230228cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
230328cb9375SWolfgang Denk		defined, the normal port 69 is used.
230428cb9375SWolfgang Denk
230528cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2306ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2307ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2308ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2309ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2310ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2311ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2312ecb0ccd9SWolfgang Denk
2313a8c7c708Swdenk- Show boot progress:
2314c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2315c609719bSwdenk
2316c609719bSwdenk		Defining this option allows to add some board-
2317c609719bSwdenk		specific code (calling a user-provided function
2318c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2319c609719bSwdenk		the system's boot progress on some display (for
2320c609719bSwdenk		example, some LED's) on your board. At the moment,
2321c609719bSwdenk		the following checkpoints are implemented:
2322c609719bSwdenk
23233a608ca0SSimon Glass- Detailed boot stage timing
23243a608ca0SSimon Glass		CONFIG_BOOTSTAGE
23253a608ca0SSimon Glass		Define this option to get detailed timing of each stage
23263a608ca0SSimon Glass		of the boot process.
23273a608ca0SSimon Glass
23283a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
23293a608ca0SSimon Glass		This is the number of available user bootstage records.
23303a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
23313a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
23323a608ca0SSimon Glass		the limit, recording will stop.
23333a608ca0SSimon Glass
23343a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
23353a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
23363a608ca0SSimon Glass
23373a608ca0SSimon Glass		Timer summary in microseconds:
23383a608ca0SSimon Glass		       Mark    Elapsed  Stage
23393a608ca0SSimon Glass			  0          0  reset
23403a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
23413a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
23423a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
23433a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
23443a608ca0SSimon Glass		  3,910,375    250,777  main_loop
23453a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
23463a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
23473a608ca0SSimon Glass
23481372cce2SMarian BalakowiczLegacy uImage format:
23491372cce2SMarian Balakowicz
2350c609719bSwdenk  Arg	Where			When
2351c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2352c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2353c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2354c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2355c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2356c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2357c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2358c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2359c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
23601372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2361c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2362c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2363c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2364c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
23651372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2366c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
23671372cce2SMarian Balakowicz
23681372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
23691372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
23701372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
23711372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
23721372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
23731372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
23741372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
237511ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
23761372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
23771372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
23781372cce2SMarian Balakowicz
2379ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2380c609719bSwdenk
2381a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
238263e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
238363e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
238463e73c9aSwdenk
2385566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2386566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2387566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2388566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2389566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2390566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2391566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2392566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2393566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2394566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2395566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2396566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2397566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2398566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2399566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2400566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2401566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2402566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2403566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2404566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2405566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2406566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2407566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2408566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2409566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2410566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2411566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2412566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2413566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2414566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2415566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2416566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2417566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2418566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2419566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2420566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2421566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2422566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2423566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2424566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2425566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2426566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2427566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2428566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2429566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2430566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2431566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2432c609719bSwdenk
2433566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2434c609719bSwdenk
2435566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2436566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2437566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2438206c60cbSwdenk
2439566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2440566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
244111ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2442566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2443566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2444566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
244574de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
244674de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2447566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2448c609719bSwdenk
24491372cce2SMarian BalakowiczFIT uImage format:
24501372cce2SMarian Balakowicz
24511372cce2SMarian Balakowicz  Arg	Where			When
24521372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
24531372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
24541372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
24551372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
24561372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
24571372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2458f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
24591372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
24601372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
24611372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
24621372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
24631372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
246411ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
246511ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
24661372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
24671372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
24681372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
24691372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
24701372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
24711372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
24721372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
24731372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
24741372cce2SMarian Balakowicz
24751372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
24761372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
24771372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
247811ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
24791372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
24801372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
24811372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
24821372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
24831372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
24841372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
24851372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
24861372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
24871372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
24881372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
24891372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
24901372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
24911372cce2SMarian Balakowicz
249211ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
24931372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
24941372cce2SMarian Balakowicz
249511ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
24961372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
24971372cce2SMarian Balakowicz
249811ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
24991372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
25001372cce2SMarian Balakowicz
25014cf2609bSWolfgang Denk- Standalone program support:
25024cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
25034cf2609bSWolfgang Denk
25046feff899SWolfgang Denk		This option defines a board specific value for the
25056feff899SWolfgang Denk		address where standalone program gets loaded, thus
25066feff899SWolfgang Denk		overwriting the architecture dependent default
25074cf2609bSWolfgang Denk		settings.
25084cf2609bSWolfgang Denk
25094cf2609bSWolfgang Denk- Frame Buffer Address:
25104cf2609bSWolfgang Denk		CONFIG_FB_ADDR
25114cf2609bSWolfgang Denk
25124cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
25134cf2609bSWolfgang Denk		address for frame buffer.
25144cf2609bSWolfgang Denk		Then system will reserve the frame buffer address to
25154cf2609bSWolfgang Denk		defined address instead of lcd_setmem (this function
25166feff899SWolfgang Denk		grabs the memory for frame buffer by panel's size).
25174cf2609bSWolfgang Denk
25184cf2609bSWolfgang Denk		Please see board_init_f function.
25194cf2609bSWolfgang Denk
2520cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2521cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2522cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2523cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2524cccfc2abSDetlev Zundel
2525cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2526cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2527cccfc2abSDetlev Zundel
2528cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2529cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2530cccfc2abSDetlev Zundel
2531cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2532cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2533cccfc2abSDetlev Zundel
2534cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2535cccfc2abSDetlev Zundel
2536cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2537cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2538cccfc2abSDetlev Zundel
25396a11cf48SDaniel Schwierzeck- SPL framework
25406a11cf48SDaniel Schwierzeck		CONFIG_SPL
25416a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
25426a11cf48SDaniel Schwierzeck
254395579793STom Rini		CONFIG_SPL_LDSCRIPT
254495579793STom Rini		LDSCRIPT for linking the SPL binary.
254595579793STom Rini
254695579793STom Rini		CONFIG_SPL_MAX_SIZE
254795579793STom Rini		Maximum binary size (text, data and rodata) of the SPL binary.
254895579793STom Rini
25496a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
25506a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
25516a11cf48SDaniel Schwierzeck
255295579793STom Rini		CONFIG_SPL_BSS_START_ADDR
255395579793STom Rini		Link address for the BSS within the SPL binary.
255495579793STom Rini
255595579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
255695579793STom Rini		Maximum binary size of the BSS section of the SPL binary.
255795579793STom Rini
255895579793STom Rini		CONFIG_SPL_STACK
255995579793STom Rini		Adress of the start of the stack SPL will use
256095579793STom Rini
256195579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
256295579793STom Rini		Starting address of the malloc pool used in SPL.
256395579793STom Rini
256495579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
256595579793STom Rini		The size of the malloc pool used in SPL.
25666a11cf48SDaniel Schwierzeck
25676a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
25686a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
25696a11cf48SDaniel Schwierzeck
25706a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
25716a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
25726a11cf48SDaniel Schwierzeck
25736a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
25746a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
25756a11cf48SDaniel Schwierzeck
25766a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
25776a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
25786a11cf48SDaniel Schwierzeck
25796a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
25806a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
25816a11cf48SDaniel Schwierzeck
258295579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
258395579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
258495579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
258595579793STom Rini		Address, size and partition on the MMC to load U-Boot from
258695579793STom Rini		when the MMC is being used in raw mode.
258795579793STom Rini
258895579793STom Rini		CONFIG_SPL_FAT_SUPPORT
258995579793STom Rini		Support for fs/fat/libfat.o in SPL binary
259095579793STom Rini
259195579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
259295579793STom Rini		Filename to read to load U-Boot when reading from FAT
259395579793STom Rini
259495579793STom Rini		CONFIG_SPL_NAND_SIMPLE
259595579793STom Rini		Support for drivers/mtd/nand/libnand.o in SPL binary
259695579793STom Rini
259795579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
259895579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
259995579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
260095579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
260195579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
260295579793STom Rini		Defines the size and behavior of the NAND that SPL uses
260395579793STom Rini		to read U-Boot with CONFIG_SPL_NAND_SIMPLE
260495579793STom Rini
260595579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
260695579793STom Rini		Location in NAND for CONFIG_SPL_NAND_SIMPLE to read U-Boot
260795579793STom Rini		from.
260895579793STom Rini
260995579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
261095579793STom Rini		Location in memory for CONFIG_SPL_NAND_SIMPLE to load U-Boot
261195579793STom Rini		to.
261295579793STom Rini
261395579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
261495579793STom Rini		Define this if you need to first read the OOB and then the
261595579793STom Rini		data. This is used for example on davinci plattforms.
261695579793STom Rini
261795579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
261895579793STom Rini		Support for an OMAP3-specific set of functions to return the
261995579793STom Rini		ID and MFR of the first attached NAND chip, if present.
262095579793STom Rini
26216a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
26226a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
26236a11cf48SDaniel Schwierzeck
26246a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
26256a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
26266a11cf48SDaniel Schwierzeck
26276a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
26286a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
26296a11cf48SDaniel Schwierzeck
26306a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
26316a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
26321372cce2SMarian Balakowicz
2633c609719bSwdenkModem Support:
2634c609719bSwdenk--------------
2635c609719bSwdenk
2636566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
2637c609719bSwdenk
263811ccc33fSMarcel Ziswiler- Modem support enable:
2639c609719bSwdenk		CONFIG_MODEM_SUPPORT
2640c609719bSwdenk
2641c609719bSwdenk- RTS/CTS Flow control enable:
2642c609719bSwdenk		CONFIG_HWFLOW
2643c609719bSwdenk
2644c609719bSwdenk- Modem debug support:
2645c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2646c609719bSwdenk
2647c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2648c609719bSwdenk		for modem support. Useful only with BDI2000.
2649c609719bSwdenk
2650a8c7c708Swdenk- Interrupt support (PPC):
2651a8c7c708Swdenk
2652a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2653a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
265411ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2655a8c7c708Swdenk		should set decrementer_count to appropriate value. If
265611ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2657a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
265811ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2659a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2660a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2661a8c7c708Swdenk		general timer_interrupt().
2662a8c7c708Swdenk
2663c609719bSwdenk- General:
2664c609719bSwdenk
2665c609719bSwdenk		In the target system modem support is enabled when a
2666c609719bSwdenk		specific key (key combination) is pressed during
2667c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
266811ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2669c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2670c609719bSwdenk		function, returning 1 and thus enabling modem
2671c609719bSwdenk		initialization.
2672c609719bSwdenk
2673c609719bSwdenk		If there are no modem init strings in the
2674c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2675c609719bSwdenk		previous output (banner, info printfs) will be
267611ccc33fSMarcel Ziswiler		suppressed, though.
2677c609719bSwdenk
2678c609719bSwdenk		See also: doc/README.Modem
2679c609719bSwdenk
26809660e442SHelmut RaigerBoard initialization settings:
26819660e442SHelmut Raiger------------------------------
26829660e442SHelmut Raiger
26839660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
26849660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
26859660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
26869660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
26879660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
26889660e442SHelmut Raigertypically in board_init_f() and board_init_r().
26899660e442SHelmut Raiger
26909660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
26919660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
26929660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
26939660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
2694c609719bSwdenk
2695c609719bSwdenkConfiguration Settings:
2696c609719bSwdenk-----------------------
2697c609719bSwdenk
26986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2699c609719bSwdenk		undefine this when you're short of memory.
2700c609719bSwdenk
27012fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
27022fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
27032fb2604dSPeter Tyser
27046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2705c609719bSwdenk		prompt for user input.
2706c609719bSwdenk
27076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2708c609719bSwdenk
27096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2710c609719bSwdenk
27116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2712c609719bSwdenk
27136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2714c609719bSwdenk		the application (usually a Linux kernel) when it is
2715c609719bSwdenk		booted
2716c609719bSwdenk
27176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2718c609719bSwdenk		List of legal baudrate settings for this board.
2719c609719bSwdenk
27206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2721c609719bSwdenk		Suppress display of console information at boot.
2722c609719bSwdenk
27236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2724c609719bSwdenk		If the board specific function
2725c609719bSwdenk			extern int overwrite_console (void);
2726c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2727c609719bSwdenk		serial port, else the settings in the environment are used.
2728c609719bSwdenk
27296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2730c609719bSwdenk		Enable the call to overwrite_console().
2731c609719bSwdenk
27326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2733c609719bSwdenk		Enable overwrite of previous console environment settings.
2734c609719bSwdenk
27356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2736c609719bSwdenk		Begin and End addresses of the area used by the
2737c609719bSwdenk		simple memory test.
2738c609719bSwdenk
27396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2740c609719bSwdenk		Enable an alternate, more extensive memory test.
2741c609719bSwdenk
27426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
27435f535fe1Swdenk		Scratch address used by the alternate memory test
27445f535fe1Swdenk		You only need to set this if address zero isn't writeable
27455f535fe1Swdenk
27466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
27476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
274814f73ca6SStefan Roese		this specified memory area will get subtracted from the top
274911ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
275014f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
275114f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
275214f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
27535e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
275414f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
27555e12e75dSStefan Roese		will have to get fixed in Linux additionally.
275614f73ca6SStefan Roese
275714f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
275814f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
275914f73ca6SStefan Roese		be touched.
276014f73ca6SStefan Roese
276114f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
276214f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
276314f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
276414f73ca6SStefan Roese		non page size aligned address and this could cause major
276514f73ca6SStefan Roese		problems.
276614f73ca6SStefan Roese
27676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2768c609719bSwdenk		Default load address for network file downloads
2769c609719bSwdenk
27706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2771c609719bSwdenk		Enable temporary baudrate change while serial download
2772c609719bSwdenk
27736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2774c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2775c609719bSwdenk
27766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2777c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2778c609719bSwdenk		Cogent motherboard)
2779c609719bSwdenk
27806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2781c609719bSwdenk		Physical start address of Flash memory.
2782c609719bSwdenk
27836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2784c609719bSwdenk		Physical start address of boot monitor code (set by
2785c609719bSwdenk		make config files to be same as the text base address
278614d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
27876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2788c609719bSwdenk
27896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
27903b57fe0aSwdenk		Size of memory reserved for monitor code, used to
27913b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
27923b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
27933b57fe0aSwdenk		flash sector.
2794c609719bSwdenk
27956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2796c609719bSwdenk		Size of DRAM reserved for malloc() use.
2797c609719bSwdenk
27986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
279915940c9aSStefan Roese		Normally compressed uImages are limited to an
280015940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
28016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
280215940c9aSStefan Roese		to adjust this setting to your needs.
2803c609719bSwdenk
28046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2805c609719bSwdenk		Maximum size of memory mapped by the startup code of
2806c609719bSwdenk		the Linux kernel; all data that must be processed by
28077d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
28087d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
28097d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
28107d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
2811c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
2812c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
2813c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
2814c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
2815c609719bSwdenk
2816fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2817fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2818fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2819fca43cc8SJohn Rigby		is enabled.
2820fca43cc8SJohn Rigby
2821fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
2822fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
2823fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
2824fca43cc8SJohn Rigby
2825fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
2826fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
2827fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2828fca43cc8SJohn Rigby
28296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
2830c609719bSwdenk		Max number of Flash memory banks
2831c609719bSwdenk
28326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
2833c609719bSwdenk		Max number of sectors on a Flash chip
2834c609719bSwdenk
28356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
2836c609719bSwdenk		Timeout for Flash erase operations (in ms)
2837c609719bSwdenk
28386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
2839c609719bSwdenk		Timeout for Flash write operations (in ms)
2840c609719bSwdenk
28416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
28428564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
28438564acf9Swdenk
28446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
28458564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
28468564acf9Swdenk
28476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
28488564acf9Swdenk		If defined, hardware flash sectors protection is used
28498564acf9Swdenk		instead of U-Boot software protection.
28508564acf9Swdenk
28516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
2852c609719bSwdenk
2853c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2854c609719bSwdenk		without this option such a download has to be
2855c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2856c609719bSwdenk		copy from RAM to flash.
2857c609719bSwdenk
2858c609719bSwdenk		The two-step approach is usually more reliable, since
2859c609719bSwdenk		you can check if the download worked before you erase
286011ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
286111ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2862c609719bSwdenk		downloaded image) this option may be very useful.
2863c609719bSwdenk
28646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
2865c609719bSwdenk		Define if the flash driver uses extra elements in the
28665653fc33Swdenk		common flash structure for storing flash geometry.
28675653fc33Swdenk
286800b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
28695653fc33Swdenk		This option also enables the building of the cfi_flash driver
28705653fc33Swdenk		in the drivers directory
287153cf9435Sstroese
287291809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
287391809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
287491809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
287591809ed5SPiotr Ziecik		to the MTD layer.
287691809ed5SPiotr Ziecik
28776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
287896ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
287996ef831fSGuennadi Liakhovetski
288096ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
288196ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
288296ef831fSGuennadi Liakhovetski		write commands.
288396ef831fSGuennadi Liakhovetski
28846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
28855568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
28865568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
28875568e613SStefan Roese		is useful, if some of the configured banks are only
28885568e613SStefan Roese		optionally available.
28895568e613SStefan Roese
28909a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
28919a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
28929a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
28939a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
28949a042e9cSJerry Van Baren
28956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
289611ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
289711ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
289853cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
289953cf9435Sstroese		buffers can be full shortly after enabling the interface
290011ccc33fSMarcel Ziswiler		on high Ethernet traffic.
290153cf9435Sstroese		Defaults to 4 if not defined.
2902c609719bSwdenk
2903ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
2904ea882bafSWolfgang Denk
2905ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
2906ea882bafSWolfgang Denk	internally to store the environment settings. The default
2907ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
2908ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
2909ea882bafSWolfgang Denk	lib/hashtable.c for details.
2910ea882bafSWolfgang Denk
2911c609719bSwdenkThe following definitions that deal with the placement and management
2912c609719bSwdenkof environment data (variable area); in general, we support the
2913c609719bSwdenkfollowing configurations:
2914c609719bSwdenk
2915c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
2916c3eb3fe4SMike Frysinger
2917c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
2918c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
2919c3eb3fe4SMike Frysinger
29205a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2921c609719bSwdenk
2922c609719bSwdenk	Define this if the environment is in flash memory.
2923c609719bSwdenk
2924c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2925c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2926c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2927c609719bSwdenk	   sector" type flash chips, which have several smaller
2928c609719bSwdenk	   sectors at the start or the end. For instance, such a
2929c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2930c609719bSwdenk	   such a case you would place the environment in one of the
2931c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2932c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2933c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2934c609719bSwdenk	   between U-Boot and the environment.
2935c609719bSwdenk
29360e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2937c609719bSwdenk
2938c609719bSwdenk	   Offset of environment data (variable area) to the
2939c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2940c609719bSwdenk	   type flash chips the second sector can be used: the offset
2941c609719bSwdenk	   for this sector is given here.
2942c609719bSwdenk
29436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2944c609719bSwdenk
29450e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
2946c609719bSwdenk
2947c609719bSwdenk	   This is just another way to specify the start address of
2948c609719bSwdenk	   the flash sector containing the environment (instead of
29490e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
2950c609719bSwdenk
29510e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
2952c609719bSwdenk
2953c609719bSwdenk	   Size of the sector containing the environment.
2954c609719bSwdenk
2955c609719bSwdenk
2956c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2957c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2958c609719bSwdenk	   the environment.
2959c609719bSwdenk
29600e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2961c609719bSwdenk
29625a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
29630e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2964c609719bSwdenk	   of this flash sector for the environment. This saves
2965c609719bSwdenk	   memory for the RAM copy of the environment.
2966c609719bSwdenk
2967c609719bSwdenk	   It may also save flash memory if you decide to use this
2968c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2969c609719bSwdenk	   since then the remainder of the flash sector could be used
2970c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2971c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2972c609719bSwdenk	   updating the environment in flash makes it always
2973c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2974c609719bSwdenk	   wrong before the contents has been restored from a copy in
2975c609719bSwdenk	   RAM, your target system will be dead.
2976c609719bSwdenk
29770e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
29780e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
2979c609719bSwdenk
2980c609719bSwdenk	   These settings describe a second storage area used to hold
298111ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
29823e38691eSwdenk	   a valid backup copy in case there is a power failure during
2983c609719bSwdenk	   a "saveenv" operation.
2984c609719bSwdenk
2985c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2986c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2987c609719bSwdenkaccordingly!
2988c609719bSwdenk
2989c609719bSwdenk
29909314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
2991c609719bSwdenk
2992c609719bSwdenk	Define this if you have some non-volatile memory device
2993c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2994c609719bSwdenk	environment.
2995c609719bSwdenk
29960e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
29970e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2998c609719bSwdenk
299911ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3000c609719bSwdenk	  want to use for environment. It is assumed that this memory
3001c609719bSwdenk	  can just be read and written to, without any special
3002c609719bSwdenk	  provision.
3003c609719bSwdenk
3004c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3005c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
300611ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3007c609719bSwdenkU-Boot will hang.
3008c609719bSwdenk
3009c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3010c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3011c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3012c609719bSwdenkto save the current settings.
3013c609719bSwdenk
3014c609719bSwdenk
3015bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3016c609719bSwdenk
3017c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3018c609719bSwdenk	device and a driver for it.
3019c609719bSwdenk
30200e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
30210e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3022c609719bSwdenk
3023c609719bSwdenk	  These two #defines specify the offset and size of the
3024c609719bSwdenk	  environment area within the total memory of your EEPROM.
3025c609719bSwdenk
30266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3027c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3028c609719bSwdenk	  The default address is zero.
3029c609719bSwdenk
30306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3031c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3032c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3033c609719bSwdenk	  would require six bits.
3034c609719bSwdenk
30356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3036c609719bSwdenk	  If defined, the number of milliseconds to delay between
3037c609719bSwdenk	  page writes.	The default is zero milliseconds.
3038c609719bSwdenk
30396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3040c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3041c609719bSwdenk	  that this is NOT the chip address length!
3042c609719bSwdenk
30436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
30445cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
30455cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
30465cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
30475cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
30485cf91d6bSwdenk	  byte chips.
30495cf91d6bSwdenk
30505cf91d6bSwdenk	  Note that we consider the length of the address field to
30515cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
30525cf91d6bSwdenk	  in the chip address.
30535cf91d6bSwdenk
30546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3055c609719bSwdenk	  The size in bytes of the EEPROM device.
3056c609719bSwdenk
3057548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3058548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3059548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3060548738b4SHeiko Schocher
3061548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3062548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3063548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3064548738b4SHeiko Schocher	  EEPROM. For example:
3065548738b4SHeiko Schocher
3066548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
3067548738b4SHeiko Schocher
3068548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3069548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3070c609719bSwdenk
3071057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
30725779d8d9Swdenk
30735779d8d9Swdenk	Define this if you have a DataFlash memory device which you
30745779d8d9Swdenk	want to use for the environment.
30755779d8d9Swdenk
30760e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
30770e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
30780e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
30795779d8d9Swdenk
30805779d8d9Swdenk	  These three #defines specify the offset and size of the
30815779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
30825779d8d9Swdenk	  at the specified address.
30835779d8d9Swdenk
30840a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
30850a85a9e7SLiu Gang
30860a85a9e7SLiu Gang	Define this if you have a remote memory space which you
30870a85a9e7SLiu Gang	want to use for the local device's environment.
30880a85a9e7SLiu Gang
30890a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
30900a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
30910a85a9e7SLiu Gang
30920a85a9e7SLiu Gang	  These two #defines specify the address and size of the
30930a85a9e7SLiu Gang	  environment area within the remote memory space. The
30940a85a9e7SLiu Gang	  local device can get the environment from remote memory
3095*fc54c7faSLiu Gang	  space by SRIO or PCIE links.
30960a85a9e7SLiu Gang
30970a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
30980a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3099*fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3100*fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
31010a85a9e7SLiu Gang
310251bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
310313a5695bSwdenk
310413a5695bSwdenk	Define this if you have a NAND device which you want to use
310513a5695bSwdenk	for the environment.
310613a5695bSwdenk
31070e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
31080e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
310913a5695bSwdenk
311013a5695bSwdenk	  These two #defines specify the offset and size of the environment
3111fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3112fdd813deSScott Wood	  aligned to an erase block boundary.
31135779d8d9Swdenk
3114fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3115e443c944SMarkus Klotzbuecher
31160e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3117fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3118fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3119fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3120fdd813deSScott Wood	  aligned to an erase block boundary.
3121e443c944SMarkus Klotzbuecher
3122fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3123fdd813deSScott Wood
3124fdd813deSScott Wood	  Specifies the length of the region in which the environment
3125fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3126fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3127fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3128fdd813deSScott Wood	  the range to be avoided.
3129fdd813deSScott Wood
3130fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3131fdd813deSScott Wood
3132fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3133fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3134fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3135fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3136fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3137e443c944SMarkus Klotzbuecher
3138b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3139b74ab737SGuennadi Liakhovetski
3140b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3141b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3142b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3143b74ab737SGuennadi Liakhovetski
31446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3145c609719bSwdenk
3146c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3147c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3148c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3149c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3150c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3151c609719bSwdenk	to be a good choice since it makes it far enough from the
3152c609719bSwdenk	start of the data area as well as from the stack pointer.
3153c609719bSwdenk
3154e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3155c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3156cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3157c609719bSwdenkuntil then to read environment variables.
3158c609719bSwdenk
315985ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
316085ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
316185ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
316285ec0bccSwdenknecessary, because the first environment variable we need is the
316385ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
316485ec0bccSwdenkhave any device yet where we could complain.]
3165c609719bSwdenk
3166c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3167c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
316885ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3169c609719bSwdenk
31706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3171fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3172fc3e2165Swdenk
31736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3174fc3e2165Swdenk		      also needs to be defined.
3175fc3e2165Swdenk
31766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3177fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3178c609719bSwdenk
3179f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3180f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3181f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3182f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3183f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3184f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3185f5675aa5SRon Madrid
3186c609719bSwdenkLow Level (hardware related) configuration options:
3187dc7c9a1aSwdenk---------------------------------------------------
3188c609719bSwdenk
31896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3190c609719bSwdenk		Cache Line Size of the CPU.
3191c609719bSwdenk
31926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3193c609719bSwdenk		Default address of the IMMR after system reset.
31942535d602Swdenk
31952535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
31962535d602Swdenk		and RPXsuper) to be able to adjust the position of
31972535d602Swdenk		the IMMR register after a reset.
3198c609719bSwdenk
3199e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3200e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3201e46fedfeSTimur Tabi		PowerPC SOCs.
3202e46fedfeSTimur Tabi
3203e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3204e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3205e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3206e46fedfeSTimur Tabi
3207e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3208e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3209e46fedfeSTimur Tabi
3210e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3211e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3212e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3213e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3214e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3215e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3216e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3217e46fedfeSTimur Tabi
3218e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3219e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3220e46fedfeSTimur Tabi
3221e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3222e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3223e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3224e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3225e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3226e46fedfeSTimur Tabi
3227e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3228e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3229e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3230e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3231e46fedfeSTimur Tabi
3232e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3233e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3234e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3235e46fedfeSTimur Tabi
32367f6c2cbcSwdenk- Floppy Disk Support:
32376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
32387f6c2cbcSwdenk
32397f6c2cbcSwdenk		the default drive number (default value 0)
32407f6c2cbcSwdenk
32416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
32427f6c2cbcSwdenk
324311ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
32447f6c2cbcSwdenk		(default value 1)
32457f6c2cbcSwdenk
32466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
32477f6c2cbcSwdenk
32487f6c2cbcSwdenk		defines the offset of register from address. It
32497f6c2cbcSwdenk		depends on which part of the data bus is connected to
325011ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
32517f6c2cbcSwdenk
32526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
32536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
32547f6c2cbcSwdenk		default value.
32557f6c2cbcSwdenk
32566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
32577f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
32587f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
32597f6c2cbcSwdenk		source code. It is used to make hardware dependant
32607f6c2cbcSwdenk		initializations.
32617f6c2cbcSwdenk
32620abddf82SMacpaul Lin- CONFIG_IDE_AHB:
32630abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
32640abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
32650abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
32660abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
32670abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
32680abddf82SMacpaul Lin		is requierd.
32690abddf82SMacpaul Lin
32706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
327125d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
327225d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3273c609719bSwdenk
32746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3275c609719bSwdenk
32767152b1d0Swdenk		Start address of memory area that can be used for
3277c609719bSwdenk		initial data and stack; please note that this must be
3278c609719bSwdenk		writable memory that is working WITHOUT special
3279c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3280c609719bSwdenk		will become available only after programming the
3281c609719bSwdenk		memory controller and running certain initialization
3282c609719bSwdenk		sequences.
3283c609719bSwdenk
3284c609719bSwdenk		U-Boot uses the following memory types:
3285c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3286c609719bSwdenk		- MPC824X: data cache
3287c609719bSwdenk		- PPC4xx:  data cache
3288c609719bSwdenk
32896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3290c609719bSwdenk
3291c609719bSwdenk		Offset of the initial data structure in the memory
32926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
32936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3294c609719bSwdenk		data is located at the end of the available space
3295553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
32966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
32976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
32986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3299c609719bSwdenk
3300c609719bSwdenk	Note:
3301c609719bSwdenk		On the MPC824X (or other systems that use the data
3302c609719bSwdenk		cache for initial memory) the address chosen for
33036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3304c609719bSwdenk		point to an otherwise UNUSED address space between
3305c609719bSwdenk		the top of RAM and the start of the PCI space.
3306c609719bSwdenk
33076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3308c609719bSwdenk
33096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3310c609719bSwdenk
33116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3312c609719bSwdenk
33136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3314c609719bSwdenk
33156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3316c609719bSwdenk
33176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3318c609719bSwdenk
33196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3320c609719bSwdenk		SDRAM timing
3321c609719bSwdenk
33226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3323c609719bSwdenk		periodic timer for refresh
3324c609719bSwdenk
33256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3326c609719bSwdenk
33276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
33286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
33296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
33306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3331c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3332c609719bSwdenk
3333c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
33346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
33356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3336c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3337c609719bSwdenk
33386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
33396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3340c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3341c609719bSwdenk		Prescaler definitions (SDRAM timing)
3342c609719bSwdenk
33436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3344c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3345c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3346c609719bSwdenk
33476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3348b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3349b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3350b423d055SHeiko Schocher
33516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3352c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3353c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3354c609719bSwdenk
33556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3356c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3357c609719bSwdenk		wrong setting might damage your board. Read
3358c609719bSwdenk		doc/README.MBX before setting this variable!
3359c609719bSwdenk
33606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3361ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3362ea909b76Swdenk		(Power On Self Tests). This definition overrides
3363ea909b76Swdenk		#define'd default value in commproc.h resp.
3364ea909b76Swdenk		cpm_8260.h.
3365ea909b76Swdenk
33666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
33676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
33686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
33696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
33706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
33716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
33726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
33736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3374a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
33755d232d0eSwdenk
33769cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
33779cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
33789cacf4fcSDirk Eibach		required.
33799cacf4fcSDirk Eibach
3380a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
3381a09b9b68SKumar Gala		Chip has SRIO or not
3382a09b9b68SKumar Gala
3383a09b9b68SKumar Gala- CONFIG_SRIO1:
3384a09b9b68SKumar Gala		Board has SRIO 1 port available
3385a09b9b68SKumar Gala
3386a09b9b68SKumar Gala- CONFIG_SRIO2:
3387a09b9b68SKumar Gala		Board has SRIO 2 port available
3388a09b9b68SKumar Gala
3389a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
3390a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
3391a09b9b68SKumar Gala
3392a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
3393a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
3394a09b9b68SKumar Gala
3395a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
3396a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
3397a09b9b68SKumar Gala
3398eced4626SAlex Waterman- CONFIG_SYS_NDFC_16
3399eced4626SAlex Waterman		Defined to tell the NDFC that the NAND chip is using a
3400eced4626SAlex Waterman		16 bit bus.
3401eced4626SAlex Waterman
3402eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
3403eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
3404eced4626SAlex Waterman		a default value will be used.
3405eced4626SAlex Waterman
3406bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
3407218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
3408218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
3409218ca724SWolfgang Denk
3410bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
3411bb99ad6dSBen Warren		I2C address of the SPD EEPROM
3412bb99ad6dSBen Warren
34136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
3414218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
3415218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
3416218ca724SWolfgang Denk		to something your driver can deal with.
3417bb99ad6dSBen Warren
34181b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
34191b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
34201b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
34211b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
34221b3e3c4fSYork Sun		header files or board specific files.
34231b3e3c4fSYork Sun
34246f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
34256f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
34266f5e1dc5SYork Sun
34276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
3428218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
3429218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
34302ad6b513STimur Tabi
3431c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
3432c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
3433c26e454dSwdenk
3434c26e454dSwdenk- CONFIG_FEC[12]_PHY
3435c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
34366e592385Swdenk		to the given FEC; i. e.
3437c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
3438c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
3439c26e454dSwdenk
3440c26e454dSwdenk		When set to -1, means to probe for first available.
3441c26e454dSwdenk
3442c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
3443c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
3444c26e454dSwdenk		(so program the FEC to ignore it).
3445c26e454dSwdenk
3446c26e454dSwdenk- CONFIG_RMII
3447c26e454dSwdenk		Enable RMII mode for all FECs.
3448c26e454dSwdenk		Note that this is a global option, we can't
3449c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
3450c26e454dSwdenk
34515cf91d6bSwdenk- CONFIG_CRC32_VERIFY
34525cf91d6bSwdenk		Add a verify option to the crc32 command.
34535cf91d6bSwdenk		The syntax is:
34545cf91d6bSwdenk
34555cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
34565cf91d6bSwdenk
34575cf91d6bSwdenk		Where address/count indicate a memory area
34585cf91d6bSwdenk		and crc32 is the correct crc32 which the
34595cf91d6bSwdenk		area should have.
34605cf91d6bSwdenk
346156523f12Swdenk- CONFIG_LOOPW
346256523f12Swdenk		Add the "loopw" memory command. This only takes effect if
3463602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
346456523f12Swdenk
34657b466641Sstroese- CONFIG_MX_CYCLIC
34667b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
34677b466641Sstroese		"md/mw" commands.
34687b466641Sstroese		Examples:
34697b466641Sstroese
34707b466641Sstroese		=> mdc.b 10 4 500
34717b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
34727b466641Sstroese
34737b466641Sstroese		=> mwc.l 100 12345678 10
34747b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
34757b466641Sstroese
34767b466641Sstroese		This only takes effect if the memory commands are activated
3477602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
34787b466641Sstroese
34798aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
3480afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
3481e03f3169SWolfgang Denk		low level initializations (like setting up the memory
3482e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
3483e03f3169SWolfgang Denk		relocate itself into RAM.
34848aa1a2d1Swdenk
3485e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
3486e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
3487e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
3488e03f3169SWolfgang Denk		these initializations itself.
34898aa1a2d1Swdenk
3490401bb30bSAneesh V- CONFIG_SPL_BUILD
3491df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
3492df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
3493df81238bSMagnus Lilja		compiling a NAND SPL.
3494400558b5Swdenk
3495d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3496d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3497d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3498d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3499d8834a13SMatthias Weisser		conditions but may increase the binary size.
3500d8834a13SMatthias Weisser
3501f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
3502f2717b47STimur Tabi-----------------------------------
3503f2717b47STimur Tabi
3504f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
3505f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
3506f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
3507f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
3508f2717b47STimur Tabiwithin that device.
3509f2717b47STimur Tabi
3510f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
3511f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
3512f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
3513f2717b47STimur Tabi	is also specified.
3514f2717b47STimur Tabi
3515f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
3516f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
3517f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
3518f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
3519f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
3520f2717b47STimur Tabi
3521f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
3522f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
3523f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
3524f2717b47STimur Tabi	virtual address in NOR flash.
3525f2717b47STimur Tabi
3526f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
3527f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
3528f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
3529f2717b47STimur Tabi
3530f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
3531f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
3532f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3533f2717b47STimur Tabi
3534f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
3535f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
3536f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3537f2717b47STimur Tabi
3538292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
3539292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
3540292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
3541*fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
3542*fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
3543*fc54c7faSLiu Gang	master's memory space.
3544f2717b47STimur Tabi
3545c609719bSwdenkBuilding the Software:
3546c609719bSwdenk======================
3547c609719bSwdenk
3548218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
3549218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
3550218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
3551218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
3552218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3553218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
3554c609719bSwdenk
3555218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
3556218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
3557218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
3558218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
3559218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
3560c609719bSwdenk
3561218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
3562218ca724SWolfgang Denk	$ export CROSS_COMPILE
3563c609719bSwdenk
35642f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
35652f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
35662f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
35672f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
35682f8d396bSPeter Tyser
35692f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
35702f8d396bSPeter Tyser
35712f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
35722f8d396bSPeter Tyser      be executed on computers running Windows.
35732f8d396bSPeter Tyser
3574c609719bSwdenkU-Boot is intended to be simple to build. After installing the
3575c609719bSwdenksources you must configure U-Boot for one specific board type. This
3576c609719bSwdenkis done by typing:
3577c609719bSwdenk
3578c609719bSwdenk	make NAME_config
3579c609719bSwdenk
3580218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
35814d675ae6SMichael Jonesrations; see boards.cfg for supported names.
358254387ac9Swdenk
3583c609719bSwdenkNote: for some board special configuration names may exist; check if
3584c609719bSwdenk      additional information is available from the board vendor; for
35852729af9dSwdenk      instance, the TQM823L systems are available without (standard)
35862729af9dSwdenk      or with LCD support. You can select such additional "features"
358711ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
3588c609719bSwdenk
35892729af9dSwdenk      make TQM823L_config
35902729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
3591c609719bSwdenk
3592c609719bSwdenk      make TQM823L_LCD_config
3593c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
3594c609719bSwdenk
3595c609719bSwdenk      etc.
3596c609719bSwdenk
3597c609719bSwdenk
3598c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
35997152b1d0Swdenkimages ready for download to / installation on your system:
3600c609719bSwdenk
3601c609719bSwdenk- "u-boot.bin" is a raw binary image
3602c609719bSwdenk- "u-boot" is an image in ELF binary format
3603c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
3604c609719bSwdenk
3605baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
3606baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
3607baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
3608baf31249SMarian Balakowicz
3609baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
3610baf31249SMarian Balakowicz
3611baf31249SMarian Balakowicz	make O=/tmp/build distclean
3612baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
3613baf31249SMarian Balakowicz	make O=/tmp/build all
3614baf31249SMarian Balakowicz
3615baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
3616baf31249SMarian Balakowicz
3617baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3618baf31249SMarian Balakowicz	make distclean
3619baf31249SMarian Balakowicz	make NAME_config
3620baf31249SMarian Balakowicz	make all
3621baf31249SMarian Balakowicz
3622baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
3623baf31249SMarian Balakowiczvariable.
3624baf31249SMarian Balakowicz
3625c609719bSwdenk
3626c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
3627c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
3628c609719bSwdenknative "make".
3629c609719bSwdenk
3630c609719bSwdenk
3631c609719bSwdenkIf the system board that you have is not listed, then you will need
3632c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
3633c609719bSwdenksteps:
3634c609719bSwdenk
3635c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
36364d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
36374d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
3638c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
363985ec0bccSwdenk    files you need. In your board directory, you will need at least
364085ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
364185ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
364285ec0bccSwdenk    your board
3643c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
3644c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
364585ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3646c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3647c609719bSwdenk    to be installed on your target system.
364885ec0bccSwdenk6.  Debug and solve any problems that might arise.
3649c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3650c609719bSwdenk
3651c609719bSwdenk
3652c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3653c609719bSwdenk==============================================================
3654c609719bSwdenk
3655c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3656c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3657c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3658c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3659218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3660c609719bSwdenk
3661c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3662c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3663c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3664c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3665c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
36667152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3667218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3668218ca724SWolfgang Denkyou can type
3669c609719bSwdenk
3670c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3671c609719bSwdenk
3672c609719bSwdenkor to build on a native PowerPC system you can type
3673c609719bSwdenk
3674c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3675c609719bSwdenk
3676218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3677218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3678218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3679218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3680218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3681218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3682218ca724SWolfgang Denkvariable. For example:
3683baf31249SMarian Balakowicz
3684baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3685baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3686baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3687baf31249SMarian Balakowicz
3688218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3689218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3690218ca724SWolfgang Denkduring the whole build process.
3691baf31249SMarian Balakowicz
3692baf31249SMarian Balakowicz
3693c609719bSwdenkSee also "U-Boot Porting Guide" below.
3694c609719bSwdenk
3695c609719bSwdenk
3696c609719bSwdenkMonitor Commands - Overview:
3697c609719bSwdenk============================
3698c609719bSwdenk
3699c609719bSwdenkgo	- start application at address 'addr'
3700c609719bSwdenkrun	- run commands in an environment variable
3701c609719bSwdenkbootm	- boot application image from memory
3702c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
370344f074c7SMarek Vasutbootz   - boot zImage from memory
3704c609719bSwdenktftpboot- boot image via network using TFTP protocol
3705c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3706c609719bSwdenk	       (and eventually "gatewayip")
37071fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
3708c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3709c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3710c609719bSwdenkloads	- load S-Record file over serial line
3711c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3712c609719bSwdenkmd	- memory display
3713c609719bSwdenkmm	- memory modify (auto-incrementing)
3714c609719bSwdenknm	- memory modify (constant address)
3715c609719bSwdenkmw	- memory write (fill)
3716c609719bSwdenkcp	- memory copy
3717c609719bSwdenkcmp	- memory compare
3718c609719bSwdenkcrc32	- checksum calculation
37190f89c54bSPeter Tyseri2c	- I2C sub-system
3720c609719bSwdenksspi	- SPI utility commands
3721c609719bSwdenkbase	- print or set address offset
3722c609719bSwdenkprintenv- print environment variables
3723c609719bSwdenksetenv	- set environment variables
3724c609719bSwdenksaveenv - save environment variables to persistent storage
3725c609719bSwdenkprotect - enable or disable FLASH write protection
3726c609719bSwdenkerase	- erase FLASH memory
3727c609719bSwdenkflinfo	- print FLASH memory information
3728c609719bSwdenkbdinfo	- print Board Info structure
3729c609719bSwdenkiminfo	- print header information for application image
3730c609719bSwdenkconinfo - print console devices and informations
3731c609719bSwdenkide	- IDE sub-system
3732c609719bSwdenkloop	- infinite loop on address range
373356523f12Swdenkloopw	- infinite write loop on address range
3734c609719bSwdenkmtest	- simple RAM test
3735c609719bSwdenkicache	- enable or disable instruction cache
3736c609719bSwdenkdcache	- enable or disable data cache
3737c609719bSwdenkreset	- Perform RESET of the CPU
3738c609719bSwdenkecho	- echo args to console
3739c609719bSwdenkversion - print monitor version
3740c609719bSwdenkhelp	- print online help
3741c609719bSwdenk?	- alias for 'help'
3742c609719bSwdenk
3743c609719bSwdenk
3744c609719bSwdenkMonitor Commands - Detailed Description:
3745c609719bSwdenk========================================
3746c609719bSwdenk
3747c609719bSwdenkTODO.
3748c609719bSwdenk
3749c609719bSwdenkFor now: just type "help <command>".
3750c609719bSwdenk
3751c609719bSwdenk
3752c609719bSwdenkEnvironment Variables:
3753c609719bSwdenk======================
3754c609719bSwdenk
3755c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3756c609719bSwdenkcan be made persistent by saving to Flash memory.
3757c609719bSwdenk
3758c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3759c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3760c609719bSwdenkwithout a value can be used to delete a variable from the
3761c609719bSwdenkenvironment. As long as you don't save the environment you are
3762c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3763c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3764c609719bSwdenk
3765c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3766c96f86eeSWolfgang Denk
3767c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3768c609719bSwdenk
3769c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3770c609719bSwdenk
3771c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3772c609719bSwdenk
3773c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3774c609719bSwdenk
3775c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3776c609719bSwdenk
3777c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3778c609719bSwdenk
37797d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
37807d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
37817d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
37827d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
37837d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
37847d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
3785c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3786c3624e6eSGrant Likely		  bootm_mapsize.
3787c3624e6eSGrant Likely
3788c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3789c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
3790c3624e6eSGrant Likely		  defines the size of the memory region starting at base
3791c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
3792c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
3793c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
3794c3624e6eSGrant Likely		  used otherwise.
37957d721e34SBartlomiej Sieka
37967d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
37977d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
37987d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
37997d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
38007d721e34SBartlomiej Sieka		  environment variable.
38017d721e34SBartlomiej Sieka
38024bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
38034bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
38044bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
38054bae9090SBartlomiej Sieka
3806c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
3807c609719bSwdenk		  "bootp" will just load perform a lookup of the
3808c609719bSwdenk		  configuration from the BOOTP server, but not try to
3809c609719bSwdenk		  load any image using TFTP
3810c609719bSwdenk
3811c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
3812c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
3813c609719bSwdenk		  be automatically started (by internally calling
3814c609719bSwdenk		  "bootm")
3815c609719bSwdenk
38164a6fd34bSwdenk		  If set to "no", a standalone image passed to the
38174a6fd34bSwdenk		  "bootm" command will be copied to the load address
38184a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
38194a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
38204a6fd34bSwdenk		  data.
38214a6fd34bSwdenk
3822a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
3823a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
3824fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
3825fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
3826fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
3827fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
3828fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
3829fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
3830fa34f6b2SShawn Guo		  access it during the boot procedure.
3831fa34f6b2SShawn Guo
3832a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
3833a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
3834a28afca5SDavid A. Long		  to work it must reside in writable memory, have
3835a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
3836a28afca5SDavid A. Long		  add the information it needs into it, and the memory
3837a28afca5SDavid A. Long		  must be accessible by the kernel.
3838a28afca5SDavid A. Long
3839eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
3840eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
3841eea63e05SSimon Glass		  defined.
3842eea63e05SSimon Glass
384317ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
384417ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
384517ea1177Swdenk		  mode (400kHZ). This environment variable is used in
384617ea1177Swdenk		  initialization code. So, for changes to be effective
384717ea1177Swdenk		  it must be saved and board must be reset.
384817ea1177Swdenk
3849c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
3850c609719bSwdenk		  If this variable is not set, initrd images will be
3851c609719bSwdenk		  copied to the highest possible address in RAM; this
3852c609719bSwdenk		  is usually what you want since it allows for
3853c609719bSwdenk		  maximum initrd size. If for some reason you want to
3854c609719bSwdenk		  make sure that the initrd image is loaded below the
38556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3856c609719bSwdenk		  variable to a value of "no" or "off" or "0".
3857c609719bSwdenk		  Alternatively, you can set it to a maximum upper
3858c609719bSwdenk		  address to use (U-Boot will still check that it
3859c609719bSwdenk		  does not overwrite the U-Boot stack and data).
3860c609719bSwdenk
3861c609719bSwdenk		  For instance, when you have a system with 16 MB
38627152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
3863c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
3864c609719bSwdenk		  the "bootargs" variable. However, now you must make
38657152b1d0Swdenk		  sure that the initrd image is placed in the first
3866c609719bSwdenk		  12 MB as well - this can be done with
3867c609719bSwdenk
3868c609719bSwdenk		  setenv initrd_high 00c00000
3869c609719bSwdenk
387038b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
387138b99261Swdenk		  indication to U-Boot that all addresses are legal
387238b99261Swdenk		  for the Linux kernel, including addresses in flash
387338b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
387438b99261Swdenk		  ramdisk at all. This may be useful to reduce the
387538b99261Swdenk		  boot time on your system, but requires that this
387638b99261Swdenk		  feature is supported by your Linux kernel.
387738b99261Swdenk
3878c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
3879c609719bSwdenk
3880c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
3881dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
3882c609719bSwdenk
3883c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
3884c609719bSwdenk
3885c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
3886c609719bSwdenk
3887c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
3888c609719bSwdenk
3889c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
3890c609719bSwdenk
3891c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
3892c609719bSwdenk
3893e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
3894a3d991bdSwdenk
3895e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
3896e2a53458SMike Frysinger		  For example you can do the following
3897a3d991bdSwdenk
389848690d80SHeiko Schocher		  => setenv ethact FEC
389948690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
390048690d80SHeiko Schocher		  => setenv ethact SCC
390148690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
3902a3d991bdSwdenk
3903e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
3904e1692577SMatthias Fuchs		  available network interfaces.
3905e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
3906e1692577SMatthias Fuchs
3907a3d991bdSwdenk  netretry	- When set to "no" each network operation will
3908a3d991bdSwdenk		  either succeed or fail without retrying.
39096e592385Swdenk		  When set to "once" the network operation will
39106e592385Swdenk		  fail when all the available network interfaces
39116e592385Swdenk		  are tried once without success.
3912a3d991bdSwdenk		  Useful on scripts which control the retry operation
3913a3d991bdSwdenk		  themselves.
3914a3d991bdSwdenk
3915b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
3916a1cf027aSJean-Christophe PLAGNIOL-VILLARD
391728cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
3918ecb0ccd9SWolfgang Denk		  UDP source port.
3919ecb0ccd9SWolfgang Denk
392028cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
392128cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
392228cb9375SWolfgang Denk
3923c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
3924c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
3925c96f86eeSWolfgang Denk
3926c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
3927c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
3928c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
3929c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
3930c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
3931c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
3932c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
3933c96f86eeSWolfgang Denk
3934a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
393511ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
3936a3d991bdSwdenk		  VLAN tagged frames.
3937c609719bSwdenk
3938dc0b7b0eSJason HobbsThe following image location variables contain the location of images
3939dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
3940dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
3941dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
3942dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
3943dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
3944dc0b7b0eSJason Hobbsflash or offset in NAND flash.
3945dc0b7b0eSJason Hobbs
3946dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
3947dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
3948dc0b7b0eSJason Hobbsboards use these variables for other purposes.
3949dc0b7b0eSJason Hobbs
3950dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
3951dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
3952dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
3953dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
3954dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
3955dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
3956dc0b7b0eSJason Hobbs
3957c609719bSwdenkThe following environment variables may be used and automatically
3958c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
3959c609719bSwdenkdepending the information provided by your boot server:
3960c609719bSwdenk
3961c609719bSwdenk  bootfile	- see above
3962c609719bSwdenk  dnsip		- IP address of your Domain Name Server
3963fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
3964c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
3965c609719bSwdenk  hostname	- Target hostname
3966c609719bSwdenk  ipaddr	- see above
3967c609719bSwdenk  netmask	- Subnet Mask
3968c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
3969c609719bSwdenk  serverip	- see above
3970c609719bSwdenk
3971c609719bSwdenk
3972c609719bSwdenkThere are two special Environment Variables:
3973c609719bSwdenk
3974c609719bSwdenk  serial#	- contains hardware identification information such
3975c609719bSwdenk		  as type string and/or serial number
3976c609719bSwdenk  ethaddr	- Ethernet address
3977c609719bSwdenk
3978c609719bSwdenkThese variables can be set only once (usually during manufacturing of
3979c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
3980c609719bSwdenkonce they have been set once.
3981c609719bSwdenk
3982c609719bSwdenk
3983c1551ea8SstroeseFurther special Environment Variables:
3984c1551ea8Sstroese
3985c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
3986c1551ea8Sstroese		  with the "version" command. This variable is
3987c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
3988c1551ea8Sstroese
3989c1551ea8Sstroese
3990c609719bSwdenkPlease note that changes to some configuration parameters may take
3991c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
3992c609719bSwdenk
3993c609719bSwdenk
3994f07771ccSwdenkCommand Line Parsing:
3995f07771ccSwdenk=====================
3996f07771ccSwdenk
3997f07771ccSwdenkThere are two different command line parsers available with U-Boot:
39987152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
3999f07771ccSwdenk
4000f07771ccSwdenkOld, simple command line parser:
4001f07771ccSwdenk--------------------------------
4002f07771ccSwdenk
4003f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4004f07771ccSwdenk- several commands on one line, separated by ';'
4005fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4006f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4007f07771ccSwdenk  for example:
4008fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4009f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4010f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4011f07771ccSwdenk
4012f07771ccSwdenkHush shell:
4013f07771ccSwdenk-----------
4014f07771ccSwdenk
4015f07771ccSwdenk- similar to Bourne shell, with control structures like
4016f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4017f07771ccSwdenk  until...do...done, ...
4018f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4019f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4020f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4021f07771ccSwdenk  command
4022f07771ccSwdenk
4023f07771ccSwdenkGeneral rules:
4024f07771ccSwdenk--------------
4025f07771ccSwdenk
4026f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4027f07771ccSwdenk    command) contains several commands separated by semicolon, and
4028f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4029f07771ccSwdenk    executed anyway.
4030f07771ccSwdenk
4031f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
403211ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4033f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4034f07771ccSwdenk    variables are not executed.
4035f07771ccSwdenk
4036c609719bSwdenkNote for Redundant Ethernet Interfaces:
4037c609719bSwdenk=======================================
4038c609719bSwdenk
403911ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4040c609719bSwdenksuch configurations and is capable of automatic selection of a
40417152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4042c609719bSwdenk
4043c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4044c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4045c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4046c609719bSwdenk
4047c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4048c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4049c609719bSwdenkding setting in the environment; if the corresponding environment
4050c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4051c609719bSwdenk
4052c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4053c609719bSwdenk  environment, the SROM's address is used.
4054c609719bSwdenk
4055c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4056c609719bSwdenk  environment exists, then the value from the environment variable is
4057c609719bSwdenk  used.
4058c609719bSwdenk
4059c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4060c609719bSwdenk  both addresses are the same, this MAC address is used.
4061c609719bSwdenk
4062c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4063c609719bSwdenk  addresses differ, the value from the environment is used and a
4064c609719bSwdenk  warning is printed.
4065c609719bSwdenk
4066c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4067c609719bSwdenk  is raised.
4068c609719bSwdenk
4069ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4070ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4071ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4072ecee9324SBen WarrenThe naming convention is as follows:
4073ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4074c609719bSwdenk
4075c609719bSwdenkImage Formats:
4076c609719bSwdenk==============
4077c609719bSwdenk
40783310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
40793310c549SMarian Balakowiczimages in two formats:
40803310c549SMarian Balakowicz
40813310c549SMarian BalakowiczNew uImage format (FIT)
40823310c549SMarian Balakowicz-----------------------
40833310c549SMarian Balakowicz
40843310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
40853310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
40863310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
40873310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
40883310c549SMarian Balakowicz
40893310c549SMarian Balakowicz
40903310c549SMarian BalakowiczOld uImage format
40913310c549SMarian Balakowicz-----------------
40923310c549SMarian Balakowicz
40933310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
40943310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
40953310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4096c609719bSwdenk
4097c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4098c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4099f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4100f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4101f5ed9e39SPeter Tyser  INTEGRITY).
41027b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4103afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4104afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4105c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4106c609719bSwdenk* Load Address
4107c609719bSwdenk* Entry Point
4108c609719bSwdenk* Image Name
4109c609719bSwdenk* Image Timestamp
4110c609719bSwdenk
4111c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4112c609719bSwdenkand the data portions of the image are secured against corruption by
4113c609719bSwdenkCRC32 checksums.
4114c609719bSwdenk
4115c609719bSwdenk
4116c609719bSwdenkLinux Support:
4117c609719bSwdenk==============
4118c609719bSwdenk
4119c609719bSwdenkAlthough U-Boot should support any OS or standalone application
41207152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4121c609719bSwdenkU-Boot.
4122c609719bSwdenk
4123c609719bSwdenkU-Boot includes many features that so far have been part of some
4124c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4125c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4126c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
41277152b1d0Swdenkserves several purposes:
4128c609719bSwdenk
4129c609719bSwdenk- the same features can be used for other OS or standalone
4130c609719bSwdenk  applications (for instance: using compressed images to reduce the
4131c609719bSwdenk  Flash memory footprint)
4132c609719bSwdenk
4133c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
41347152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4135c609719bSwdenk
4136c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4137c609719bSwdenk  images; of course this also means that different kernel images can
4138c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4139c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4140c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4141c609719bSwdenk  software is easier now.
4142c609719bSwdenk
4143c609719bSwdenk
4144c609719bSwdenkLinux HOWTO:
4145c609719bSwdenk============
4146c609719bSwdenk
4147c609719bSwdenkPorting Linux to U-Boot based systems:
4148c609719bSwdenk---------------------------------------
4149c609719bSwdenk
4150c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4151c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4152c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4153c609719bSwdenkLinux :-).
4154c609719bSwdenk
4155a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4156c609719bSwdenk
4157c609719bSwdenkJust make sure your machine specific header file (for instance
4158c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
41591dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
41601dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
41616d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4162c609719bSwdenk
4163c609719bSwdenk
4164c609719bSwdenkConfiguring the Linux kernel:
4165c609719bSwdenk-----------------------------
4166c609719bSwdenk
4167c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4168c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4169c609719bSwdenk
4170c609719bSwdenk
4171c609719bSwdenkBuilding a Linux Image:
4172c609719bSwdenk-----------------------
4173c609719bSwdenk
417424ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
417524ee89b9Swdenknot used. If you use recent kernel source, a new build target
417624ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
417724ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
417824ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
417924ee89b9Swdenk100% compatible format.
4180c609719bSwdenk
4181c609719bSwdenkExample:
4182c609719bSwdenk
4183c609719bSwdenk	make TQM850L_config
4184c609719bSwdenk	make oldconfig
4185c609719bSwdenk	make dep
418624ee89b9Swdenk	make uImage
4187c609719bSwdenk
418824ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
418924ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
419024ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
4191c609719bSwdenk
419224ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
419324ee89b9Swdenk
419424ee89b9Swdenk* convert the kernel into a raw binary image:
419524ee89b9Swdenk
419624ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
419724ee89b9Swdenk				 -R .note -R .comment \
419824ee89b9Swdenk				 -S vmlinux linux.bin
419924ee89b9Swdenk
420024ee89b9Swdenk* compress the binary image:
420124ee89b9Swdenk
420224ee89b9Swdenk	gzip -9 linux.bin
420324ee89b9Swdenk
420424ee89b9Swdenk* package compressed binary image for U-Boot:
420524ee89b9Swdenk
420624ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
420724ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
420824ee89b9Swdenk		-d linux.bin.gz uImage
420924ee89b9Swdenk
421024ee89b9Swdenk
421124ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
421224ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
421324ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
421424ee89b9Swdenkbyte header containing information about target architecture,
421524ee89b9Swdenkoperating system, image type, compression method, entry points, time
421624ee89b9Swdenkstamp, CRC32 checksums, etc.
421724ee89b9Swdenk
421824ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
421924ee89b9Swdenkprint the header information, or to build new images.
4220c609719bSwdenk
4221c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
4222c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
4223c609719bSwdenkchecksum verification:
4224c609719bSwdenk
4225c609719bSwdenk	tools/mkimage -l image
4226c609719bSwdenk	  -l ==> list image header information
4227c609719bSwdenk
4228c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
4229c609719bSwdenkfrom a "data file" which is used as image payload:
4230c609719bSwdenk
4231c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4232c609719bSwdenk		      -n name -d data_file image
4233c609719bSwdenk	  -A ==> set architecture to 'arch'
4234c609719bSwdenk	  -O ==> set operating system to 'os'
4235c609719bSwdenk	  -T ==> set image type to 'type'
4236c609719bSwdenk	  -C ==> set compression type 'comp'
4237c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
4238c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
4239c609719bSwdenk	  -n ==> set image name to 'name'
4240c609719bSwdenk	  -d ==> use image data from 'datafile'
4241c609719bSwdenk
424269459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
424369459791Swdenkaddress (0x00000000), but the entry point address depends on the
424469459791Swdenkkernel version:
4245c609719bSwdenk
4246c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
424724ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
4248c609719bSwdenk
4249c609719bSwdenkSo a typical call to build a U-Boot image would read:
4250c609719bSwdenk
425124ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
425224ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
4253a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
425424ee89b9Swdenk	> examples/uImage.TQM850L
425524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4256c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4257c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4258c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4259c609719bSwdenk	Load Address: 0x00000000
426024ee89b9Swdenk	Entry Point:  0x00000000
4261c609719bSwdenk
4262c609719bSwdenkTo verify the contents of the image (or check for corruption):
4263c609719bSwdenk
426424ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
426524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4266c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4267c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4268c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4269c609719bSwdenk	Load Address: 0x00000000
427024ee89b9Swdenk	Entry Point:  0x00000000
4271c609719bSwdenk
4272c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
4273c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
4274c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
4275c609719bSwdenkneed to be uncompressed:
4276c609719bSwdenk
4277a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
427824ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
427924ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
4280a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
428124ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
428224ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4283c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4284c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
4285c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
4286c609719bSwdenk	Load Address: 0x00000000
428724ee89b9Swdenk	Entry Point:  0x00000000
4288c609719bSwdenk
4289c609719bSwdenk
4290c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
4291c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
4292c609719bSwdenk
4293c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
4294c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
4295c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4296c609719bSwdenk	Image Name:   Simple Ramdisk Image
4297c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
4298c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4299c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4300c609719bSwdenk	Load Address: 0x00000000
4301c609719bSwdenk	Entry Point:  0x00000000
4302c609719bSwdenk
4303c609719bSwdenk
4304c609719bSwdenkInstalling a Linux Image:
4305c609719bSwdenk-------------------------
4306c609719bSwdenk
4307c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4308c609719bSwdenkyou must convert the image to S-Record format:
4309c609719bSwdenk
4310c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4311c609719bSwdenk
4312c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4313c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4314c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4315c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4316c609719bSwdenkcommand.
4317c609719bSwdenk
4318c609719bSwdenkExample: install the image to address 0x40100000 (which on the
4319c609719bSwdenkTQM8xxL is in the first Flash bank):
4320c609719bSwdenk
4321c609719bSwdenk	=> erase 40100000 401FFFFF
4322c609719bSwdenk
4323c609719bSwdenk	.......... done
4324c609719bSwdenk	Erased 8 sectors
4325c609719bSwdenk
4326c609719bSwdenk	=> loads 40100000
4327c609719bSwdenk	## Ready for S-Record download ...
4328c609719bSwdenk	~>examples/image.srec
4329c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4330c609719bSwdenk	...
4331c609719bSwdenk	15989 15990 15991 15992
4332c609719bSwdenk	[file transfer complete]
4333c609719bSwdenk	[connected]
4334c609719bSwdenk	## Start Addr = 0x00000000
4335c609719bSwdenk
4336c609719bSwdenk
4337c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
4338c609719bSwdenkthis includes a checksum verification so you can be sure no data
4339c609719bSwdenkcorruption happened:
4340c609719bSwdenk
4341c609719bSwdenk	=> imi 40100000
4342c609719bSwdenk
4343c609719bSwdenk	## Checking Image at 40100000 ...
4344c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4345c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4346c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4347c609719bSwdenk	   Load Address: 00000000
4348c609719bSwdenk	   Entry Point:	 0000000c
4349c609719bSwdenk	   Verifying Checksum ... OK
4350c609719bSwdenk
4351c609719bSwdenk
4352c609719bSwdenkBoot Linux:
4353c609719bSwdenk-----------
4354c609719bSwdenk
4355c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
4356c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
4357c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
4358c609719bSwdenkparameters. You can check and modify this variable using the
4359c609719bSwdenk"printenv" and "setenv" commands:
4360c609719bSwdenk
4361c609719bSwdenk
4362c609719bSwdenk	=> printenv bootargs
4363c609719bSwdenk	bootargs=root=/dev/ram
4364c609719bSwdenk
4365c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4366c609719bSwdenk
4367c609719bSwdenk	=> printenv bootargs
4368c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4369c609719bSwdenk
4370c609719bSwdenk	=> bootm 40020000
4371c609719bSwdenk	## Booting Linux kernel at 40020000 ...
4372c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
4373c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4374c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
4375c609719bSwdenk	   Load Address: 00000000
4376c609719bSwdenk	   Entry Point:	 0000000c
4377c609719bSwdenk	   Verifying Checksum ... OK
4378c609719bSwdenk	   Uncompressing Kernel Image ... OK
4379c609719bSwdenk	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
4380c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4381c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4382c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4383c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4384c609719bSwdenk	...
4385c609719bSwdenk
438611ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
43877152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
4388c609719bSwdenkformat!) to the "bootm" command:
4389c609719bSwdenk
4390c609719bSwdenk	=> imi 40100000 40200000
4391c609719bSwdenk
4392c609719bSwdenk	## Checking Image at 40100000 ...
4393c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4394c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4395c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4396c609719bSwdenk	   Load Address: 00000000
4397c609719bSwdenk	   Entry Point:	 0000000c
4398c609719bSwdenk	   Verifying Checksum ... OK
4399c609719bSwdenk
4400c609719bSwdenk	## Checking Image at 40200000 ...
4401c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4402c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4403c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4404c609719bSwdenk	   Load Address: 00000000
4405c609719bSwdenk	   Entry Point:	 00000000
4406c609719bSwdenk	   Verifying Checksum ... OK
4407c609719bSwdenk
4408c609719bSwdenk	=> bootm 40100000 40200000
4409c609719bSwdenk	## Booting Linux kernel at 40100000 ...
4410c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4411c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4412c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4413c609719bSwdenk	   Load Address: 00000000
4414c609719bSwdenk	   Entry Point:	 0000000c
4415c609719bSwdenk	   Verifying Checksum ... OK
4416c609719bSwdenk	   Uncompressing Kernel Image ... OK
4417c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
4418c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4419c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4420c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4421c609719bSwdenk	   Load Address: 00000000
4422c609719bSwdenk	   Entry Point:	 00000000
4423c609719bSwdenk	   Verifying Checksum ... OK
4424c609719bSwdenk	   Loading Ramdisk ... OK
4425c609719bSwdenk	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
4426c609719bSwdenk	Boot arguments: root=/dev/ram
4427c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4428c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4429c609719bSwdenk	...
4430c609719bSwdenk	RAMDISK: Compressed image found at block 0
4431c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
4432c609719bSwdenk
4433c609719bSwdenk	bash#
4434c609719bSwdenk
44350267768eSMatthew McClintockBoot Linux and pass a flat device tree:
44360267768eSMatthew McClintock-----------
44370267768eSMatthew McClintock
44380267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
44390267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
44400267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
44410267768eSMatthew McClintockflat device tree:
44420267768eSMatthew McClintock
44430267768eSMatthew McClintock=> print oftaddr
44440267768eSMatthew McClintockoftaddr=0x300000
44450267768eSMatthew McClintock=> print oft
44460267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
44470267768eSMatthew McClintock=> tftp $oftaddr $oft
44480267768eSMatthew McClintockSpeed: 1000, full duplex
44490267768eSMatthew McClintockUsing TSEC0 device
44500267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
44510267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
44520267768eSMatthew McClintockLoad address: 0x300000
44530267768eSMatthew McClintockLoading: #
44540267768eSMatthew McClintockdone
44550267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
44560267768eSMatthew McClintock=> tftp $loadaddr $bootfile
44570267768eSMatthew McClintockSpeed: 1000, full duplex
44580267768eSMatthew McClintockUsing TSEC0 device
44590267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
44600267768eSMatthew McClintockFilename 'uImage'.
44610267768eSMatthew McClintockLoad address: 0x200000
44620267768eSMatthew McClintockLoading:############
44630267768eSMatthew McClintockdone
44640267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
44650267768eSMatthew McClintock=> print loadaddr
44660267768eSMatthew McClintockloadaddr=200000
44670267768eSMatthew McClintock=> print oftaddr
44680267768eSMatthew McClintockoftaddr=0x300000
44690267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
44700267768eSMatthew McClintock## Booting image at 00200000 ...
44710267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
44720267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
44730267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
44740267768eSMatthew McClintock   Load Address: 00000000
44750267768eSMatthew McClintock   Entry Point:	 00000000
44760267768eSMatthew McClintock   Verifying Checksum ... OK
44770267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
44780267768eSMatthew McClintockBooting using flat device tree at 0x300000
44790267768eSMatthew McClintockUsing MPC85xx ADS machine description
44800267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
44810267768eSMatthew McClintock[snip]
44820267768eSMatthew McClintock
44830267768eSMatthew McClintock
44846069ff26SwdenkMore About U-Boot Image Types:
44856069ff26Swdenk------------------------------
44866069ff26Swdenk
44876069ff26SwdenkU-Boot supports the following image types:
44886069ff26Swdenk
44896069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
44906069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
44916069ff26Swdenk	well) you can continue to work in U-Boot after return from
44926069ff26Swdenk	the Standalone Program.
44936069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
44946069ff26Swdenk	will take over control completely. Usually these programs
44956069ff26Swdenk	will install their own set of exception handlers, device
44966069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
44976069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
44986069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
44996069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
45006069ff26Swdenk	being started.
45016069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
45026069ff26Swdenk	(Linux) kernel image and one or more data images like
45036069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
45046069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
45056069ff26Swdenk	server provides just a single image file, but you want to get
45066069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
45076069ff26Swdenk
45086069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
45096069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
45106069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
45116069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
45126069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
45136069ff26Swdenk	a multiple of 4 bytes).
45146069ff26Swdenk
45156069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
45166069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
45176069ff26Swdenk	flash memory.
45186069ff26Swdenk
45196069ff26Swdenk   "Script files" are command sequences that will be executed by
45206069ff26Swdenk	U-Boot's command interpreter; this feature is especially
45216069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
45226069ff26Swdenk	as command interpreter.
45236069ff26Swdenk
452444f074c7SMarek VasutBooting the Linux zImage:
452544f074c7SMarek Vasut-------------------------
452644f074c7SMarek Vasut
452744f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
452844f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
452944f074c7SMarek Vasutas the syntax of "bootm" command.
453044f074c7SMarek Vasut
4531017e1f3fSMarek VasutNote, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
4532017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
4533017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
4534017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
4535017e1f3fSMarek Vasut
4536c609719bSwdenk
4537c609719bSwdenkStandalone HOWTO:
4538c609719bSwdenk=================
4539c609719bSwdenk
4540c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
4541c609719bSwdenkrun "standalone" applications, which can use some resources of
4542c609719bSwdenkU-Boot like console I/O functions or interrupt services.
4543c609719bSwdenk
4544c609719bSwdenkTwo simple examples are included with the sources:
4545c609719bSwdenk
4546c609719bSwdenk"Hello World" Demo:
4547c609719bSwdenk-------------------
4548c609719bSwdenk
4549c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
4550c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
4551c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
4552c609719bSwdenklike that:
4553c609719bSwdenk
4554c609719bSwdenk	=> loads
4555c609719bSwdenk	## Ready for S-Record download ...
4556c609719bSwdenk	~>examples/hello_world.srec
4557c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4558c609719bSwdenk	[file transfer complete]
4559c609719bSwdenk	[connected]
4560c609719bSwdenk	## Start Addr = 0x00040004
4561c609719bSwdenk
4562c609719bSwdenk	=> go 40004 Hello World! This is a test.
4563c609719bSwdenk	## Starting application at 0x00040004 ...
4564c609719bSwdenk	Hello World
4565c609719bSwdenk	argc = 7
4566c609719bSwdenk	argv[0] = "40004"
4567c609719bSwdenk	argv[1] = "Hello"
4568c609719bSwdenk	argv[2] = "World!"
4569c609719bSwdenk	argv[3] = "This"
4570c609719bSwdenk	argv[4] = "is"
4571c609719bSwdenk	argv[5] = "a"
4572c609719bSwdenk	argv[6] = "test."
4573c609719bSwdenk	argv[7] = "<NULL>"
4574c609719bSwdenk	Hit any key to exit ...
4575c609719bSwdenk
4576c609719bSwdenk	## Application terminated, rc = 0x0
4577c609719bSwdenk
4578c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
4579c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
4580c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
4581c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
4582c609719bSwdenkcharacter, but this is just a demo program. The application can be
4583c609719bSwdenkcontrolled by the following keys:
4584c609719bSwdenk
4585c609719bSwdenk	? - print current values og the CPM Timer registers
4586c609719bSwdenk	b - enable interrupts and start timer
4587c609719bSwdenk	e - stop timer and disable interrupts
4588c609719bSwdenk	q - quit application
4589c609719bSwdenk
4590c609719bSwdenk	=> loads
4591c609719bSwdenk	## Ready for S-Record download ...
4592c609719bSwdenk	~>examples/timer.srec
4593c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4594c609719bSwdenk	[file transfer complete]
4595c609719bSwdenk	[connected]
4596c609719bSwdenk	## Start Addr = 0x00040004
4597c609719bSwdenk
4598c609719bSwdenk	=> go 40004
4599c609719bSwdenk	## Starting application at 0x00040004 ...
4600c609719bSwdenk	TIMERS=0xfff00980
4601c609719bSwdenk	Using timer 1
4602c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4603c609719bSwdenk
4604c609719bSwdenkHit 'b':
4605c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
4606c609719bSwdenk	Enabling timer
4607c609719bSwdenkHit '?':
4608c609719bSwdenk	[q, b, e, ?] ........
4609c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4610c609719bSwdenkHit '?':
4611c609719bSwdenk	[q, b, e, ?] .
4612c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4613c609719bSwdenkHit '?':
4614c609719bSwdenk	[q, b, e, ?] .
4615c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4616c609719bSwdenkHit '?':
4617c609719bSwdenk	[q, b, e, ?] .
4618c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4619c609719bSwdenkHit 'e':
4620c609719bSwdenk	[q, b, e, ?] ...Stopping timer
4621c609719bSwdenkHit 'q':
4622c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
4623c609719bSwdenk
4624c609719bSwdenk
462585ec0bccSwdenkMinicom warning:
462685ec0bccSwdenk================
462785ec0bccSwdenk
46287152b1d0SwdenkOver time, many people have reported problems when trying to use the
462985ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
463085ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
4631f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
463285ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
463385ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
463485ec0bccSwdenk
463552f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
463652f52c14Swdenkconfiguration to your "File transfer protocols" section:
463752f52c14Swdenk
463852f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
463952f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
464052f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
464152f52c14Swdenk
464252f52c14Swdenk
4643c609719bSwdenkNetBSD Notes:
4644c609719bSwdenk=============
4645c609719bSwdenk
4646c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
4647c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
4648c609719bSwdenk
4649c609719bSwdenkBuilding requires a cross environment; it is known to work on
4650c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4651c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
4652c609719bSwdenkNote that the cross-powerpc package does not install include files;
4653c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
4654c609719bSwdenkmissing.  This file has to be installed and patched manually:
4655c609719bSwdenk
4656c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
4657c609719bSwdenk	# mkdir powerpc
4658c609719bSwdenk	# ln -s powerpc machine
4659c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4660c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
4661c609719bSwdenk
4662c609719bSwdenkNative builds *don't* work due to incompatibilities between native
4663c609719bSwdenkand U-Boot include files.
4664c609719bSwdenk
4665c609719bSwdenkBooting assumes that (the first part of) the image booted is a
4666c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
4667c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
4668c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
46692a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4670c609719bSwdenk
4671c609719bSwdenk
4672c609719bSwdenkImplementation Internals:
4673c609719bSwdenk=========================
4674c609719bSwdenk
4675c609719bSwdenkThe following is not intended to be a complete description of every
4676c609719bSwdenkimplementation detail. However, it should help to understand the
4677c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
4678c609719bSwdenkhardware.
4679c609719bSwdenk
4680c609719bSwdenk
4681c609719bSwdenkInitial Stack, Global Data:
4682c609719bSwdenk---------------------------
4683c609719bSwdenk
4684c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
4685c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
4686c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
4687c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
4688c609719bSwdenkis not initialized as zero. To be able to get a C environment working
4689c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
4690c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
4691c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
4692c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
4693c609719bSwdenklocked as (mis-) used as memory, etc.
4694c609719bSwdenk
46957152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
46960668236bSWolfgang Denk	U-Boot mailing list:
469743d9616cSwdenk
469843d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
469943d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
470043d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
470143d9616cSwdenk	...
470243d9616cSwdenk
470343d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
470443d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
470543d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
470643d9616cSwdenk	is that the cache is being used as a temporary supply of
470743d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
470811ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
470943d9616cSwdenk	can see how this works by studying the cache architecture and
471043d9616cSwdenk	operation in the architecture and processor-specific manuals.
471143d9616cSwdenk
471243d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
471343d9616cSwdenk	is another option for the system designer to use as an
471411ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
471543d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
471643d9616cSwdenk	board designers haven't used it for something that would
471743d9616cSwdenk	cause you grief during the initial boot! It is frequently not
471843d9616cSwdenk	used.
471943d9616cSwdenk
47206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
472143d9616cSwdenk	with your processor/board/system design. The default value
472243d9616cSwdenk	you will find in any recent u-boot distribution in
47238a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
472443d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
472543d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
472643d9616cSwdenk	that are supposed to respond to that address! That code in
472743d9616cSwdenk	start.S has been around a while and should work as is when
472843d9616cSwdenk	you get the config right.
472943d9616cSwdenk
473043d9616cSwdenk	-Chris Hallinan
473143d9616cSwdenk	DS4.COM, Inc.
473243d9616cSwdenk
4733c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4734c609719bSwdenkcode for the initialization procedures:
4735c609719bSwdenk
4736c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4737c609719bSwdenk  to write it.
4738c609719bSwdenk
473911ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4740c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
47417152b1d0Swdenk  zation is performed later (when relocating to RAM).
4742c609719bSwdenk
4743c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4744c609719bSwdenk  that.
4745c609719bSwdenk
4746c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4747c609719bSwdenknormal global data to share information beween the code. But it
4748c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4749c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4750c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4751c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4752c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4753c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4754c609719bSwdenkreserve for this purpose.
4755c609719bSwdenk
47567152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4757c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4758c609719bSwdenkGCC's implementation.
4759c609719bSwdenk
4760c609719bSwdenkFor PowerPC, the following registers have specific use:
4761c609719bSwdenk	R1:	stack pointer
4762e7670f6cSWolfgang Denk	R2:	reserved for system use
4763c609719bSwdenk	R3-R4:	parameter passing and return values
4764c609719bSwdenk	R5-R10: parameter passing
4765c609719bSwdenk	R13:	small data area pointer
4766c609719bSwdenk	R30:	GOT pointer
4767c609719bSwdenk	R31:	frame pointer
4768c609719bSwdenk
4769e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4770e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4771e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4772c609719bSwdenk
4773e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4774c609719bSwdenk
4775c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4776c609719bSwdenk    address of the global data structure is known at compile time),
4777c609719bSwdenk    but it turned out that reserving a register results in somewhat
4778c609719bSwdenk    smaller code - although the code savings are not that big (on
4779c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4780c609719bSwdenk    624 text + 127 data).
4781c609719bSwdenk
4782c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
47834c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
47844c58eb55SMike Frysinger
4785c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
47864c58eb55SMike Frysinger
4787c609719bSwdenkOn ARM, the following registers are used:
4788c609719bSwdenk
4789c609719bSwdenk	R0:	function argument word/integer result
4790c609719bSwdenk	R1-R3:	function argument word
4791c609719bSwdenk	R9:	GOT pointer
4792c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4793c609719bSwdenk	R11:	argument (frame) pointer
4794c609719bSwdenk	R12:	temporary workspace
4795c609719bSwdenk	R13:	stack pointer
4796c609719bSwdenk	R14:	link register
4797c609719bSwdenk	R15:	program counter
4798c609719bSwdenk
4799c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
4800c609719bSwdenk
48010df01fd3SThomas ChouOn Nios II, the ABI is documented here:
48020df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
48030df01fd3SThomas Chou
48040df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
48050df01fd3SThomas Chou
48060df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
48070df01fd3SThomas Chou    to access small data sections, so gp is free.
48080df01fd3SThomas Chou
4809afc1ce82SMacpaul LinOn NDS32, the following registers are used:
4810afc1ce82SMacpaul Lin
4811afc1ce82SMacpaul Lin	R0-R1:	argument/return
4812afc1ce82SMacpaul Lin	R2-R5:	argument
4813afc1ce82SMacpaul Lin	R15:	temporary register for assembler
4814afc1ce82SMacpaul Lin	R16:	trampoline register
4815afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
4816afc1ce82SMacpaul Lin	R29:	global pointer (GP)
4817afc1ce82SMacpaul Lin	R30:	link register (LP)
4818afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
4819afc1ce82SMacpaul Lin	PC:	program counter (PC)
4820afc1ce82SMacpaul Lin
4821afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
4822afc1ce82SMacpaul Lin
4823d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4824d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
4825c609719bSwdenk
4826c609719bSwdenkMemory Management:
4827c609719bSwdenk------------------
4828c609719bSwdenk
4829c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
4830c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
4831c609719bSwdenk
4832c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
4833c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
4834c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
4835c609719bSwdenkphysical memory banks.
4836c609719bSwdenk
4837c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
4838c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4839c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
4840c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
48416d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4842c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
4843c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
4844c609719bSwdenk
4845c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
4846c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
4847c609719bSwdenk
4848c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
4849c609719bSwdenkthis:
4850c609719bSwdenk
4851c609719bSwdenk	0x0000 0000	Exception Vector code
4852c609719bSwdenk	      :
4853c609719bSwdenk	0x0000 1FFF
4854c609719bSwdenk	0x0000 2000	Free for Application Use
4855c609719bSwdenk	      :
4856c609719bSwdenk	      :
4857c609719bSwdenk
4858c609719bSwdenk	      :
4859c609719bSwdenk	      :
4860c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
4861c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
4862c609719bSwdenk	0x00FC 0000	Malloc Arena
4863c609719bSwdenk	      :
4864c609719bSwdenk	0x00FD FFFF
4865c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
4866c609719bSwdenk	...		eventually: LCD or video framebuffer
4867c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
4868c609719bSwdenk	0x00FF FFFF	[End of RAM]
4869c609719bSwdenk
4870c609719bSwdenk
4871c609719bSwdenkSystem Initialization:
4872c609719bSwdenk----------------------
4873c609719bSwdenk
4874c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
487511ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
4876c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
48777152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
4878c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
4879c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
4880c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
4881c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
4882c609719bSwdenkthe caches and the SIU.
4883c609719bSwdenk
4884c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
4885c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
4886c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4887c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4888c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
4889c609719bSwdenksimple memory test is run that determines the size of the SDRAM
4890c609719bSwdenkbanks.
4891c609719bSwdenk
4892c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
48937152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
4894c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
4895c609719bSwdenk0x00000000, with any additional banks following immediately to create
4896c609719bSwdenkcontiguous memory starting from 0.
4897c609719bSwdenk
4898c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
4899c609719bSwdenkand allocates memory for use by malloc() and for the global Board
4900c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
4901c609719bSwdenkpages, and the final stack is set up.
4902c609719bSwdenk
4903c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
4904c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
4905c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
4906c609719bSwdenknew address in RAM.
4907c609719bSwdenk
4908c609719bSwdenk
4909c609719bSwdenkU-Boot Porting Guide:
4910c609719bSwdenk----------------------
4911c609719bSwdenk
4912c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
49136aff3115Swdenklist, October 2002]
4914c609719bSwdenk
4915c609719bSwdenk
4916c609719bSwdenkint main(int argc, char *argv[])
4917c609719bSwdenk{
4918c609719bSwdenk	sighandler_t no_more_time;
4919c609719bSwdenk
4920c609719bSwdenk	signal(SIGALRM, no_more_time);
4921c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4922c609719bSwdenk
4923c609719bSwdenk	if (available_money > available_manpower) {
49246c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
4925c609719bSwdenk		return 0;
4926c609719bSwdenk	}
4927c609719bSwdenk
4928c609719bSwdenk	Download latest U-Boot source;
4929c609719bSwdenk
49300668236bSWolfgang Denk	Subscribe to u-boot mailing list;
49316aff3115Swdenk
49326c3fef28SJerry Van Baren	if (clueless)
4933c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
4934c609719bSwdenk
4935c609719bSwdenk	while (learning) {
4936c609719bSwdenk		Read the README file in the top level directory;
49377cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
49386c3fef28SJerry Van Baren		Read applicable doc/*.README;
4939c609719bSwdenk		Read the source, Luke;
49406c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
4941c609719bSwdenk	}
4942c609719bSwdenk
49436c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
49446c3fef28SJerry Van Baren		Buy a BDI3000;
49456c3fef28SJerry Van Baren	else
4946c609719bSwdenk		Add a lot of aggravation and time;
4947c609719bSwdenk
49486c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
49496c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
49506c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
49516c3fef28SJerry Van Baren	} else {
4952c609719bSwdenk		Create your own board support subdirectory;
49536c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
49546c3fef28SJerry Van Baren	}
49556c3fef28SJerry Van Baren	Edit new board/<myboard> files
49566c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
4957c609719bSwdenk
49586c3fef28SJerry Van Baren	while (!accepted) {
4959c609719bSwdenk		while (!running) {
4960c609719bSwdenk			do {
4961c609719bSwdenk				Add / modify source code;
4962c609719bSwdenk			} until (compiles);
4963c609719bSwdenk			Debug;
4964c609719bSwdenk			if (clueless)
4965c609719bSwdenk				email("Hi, I am having problems...");
4966c609719bSwdenk		}
49676c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
49686c3fef28SJerry Van Baren		if (reasonable critiques)
49696c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
49706c3fef28SJerry Van Baren		else
49716c3fef28SJerry Van Baren			Defend code as written;
49726c3fef28SJerry Van Baren	}
4973c609719bSwdenk
4974c609719bSwdenk	return 0;
4975c609719bSwdenk}
4976c609719bSwdenk
4977c609719bSwdenkvoid no_more_time (int sig)
4978c609719bSwdenk{
4979c609719bSwdenk      hire_a_guru();
4980c609719bSwdenk}
4981c609719bSwdenk
4982c609719bSwdenk
4983c609719bSwdenkCoding Standards:
4984c609719bSwdenk-----------------
4985c609719bSwdenk
4986c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
49872c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
49887ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
4989c609719bSwdenk
49902c051651SDetlev ZundelSource files originating from a different project (for example the
49912c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
49922c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
49932c051651SDetlev Zundelsources.
49942c051651SDetlev Zundel
49952c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
49962c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
49972c051651SDetlev Zundelin your code.
4998c609719bSwdenk
4999c178d3daSwdenkPlease also stick to the following formatting rules:
5000180d3f74Swdenk- remove any trailing white space
50017ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5002180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
50037ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5004180d3f74Swdenk- do not add trailing empty lines to source files
5005180d3f74Swdenk
5006c609719bSwdenkSubmissions which do not conform to the standards may be returned
5007c609719bSwdenkwith a request to reformat the changes.
5008c609719bSwdenk
5009c609719bSwdenk
5010c609719bSwdenkSubmitting Patches:
5011c609719bSwdenk-------------------
5012c609719bSwdenk
5013c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5014c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5015c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5016c609719bSwdenk
50170d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5018218ca724SWolfgang Denk
50190668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
50200668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
50210668236bSWolfgang Denk
5022c609719bSwdenkWhen you send a patch, please include the following information with
5023c609719bSwdenkit:
5024c609719bSwdenk
5025c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5026c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5027c609719bSwdenk  patch actually fixes something.
5028c609719bSwdenk
5029c609719bSwdenk* For new features: a description of the feature and your
5030c609719bSwdenk  implementation.
5031c609719bSwdenk
5032c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5033c609719bSwdenk
5034c609719bSwdenk* For major contributions, your entry to the CREDITS file
5035c609719bSwdenk
5036c609719bSwdenk* When you add support for a new board, don't forget to add this
50377ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
5038c609719bSwdenk
5039c609719bSwdenk* If your patch adds new configuration options, don't forget to
5040c609719bSwdenk  document these in the README file.
5041c609719bSwdenk
5042218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5043218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
50447ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5045218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5046218ca724SWolfgang Denk  with some other mail clients.
5047c609719bSwdenk
5048218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5049218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5050218ca724SWolfgang Denk  GNU diff.
50516dff5529Swdenk
5052218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5053218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5054218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5055218ca724SWolfgang Denk  affected files).
5056218ca724SWolfgang Denk
5057218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5058218ca724SWolfgang Denk  and compressed attachments must not be used.
5059c609719bSwdenk
506052f52c14Swdenk* If one logical set of modifications affects or creates several
506152f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
506252f52c14Swdenk
506352f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
506452f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
506552f52c14Swdenk
506652f52c14Swdenk
5067c609719bSwdenkNotes:
5068c609719bSwdenk
5069c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5070c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5071c609719bSwdenk  for any of the boards.
5072c609719bSwdenk
5073c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5074c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5075c609719bSwdenk  returned with a request to re-formatting / split it.
5076c609719bSwdenk
5077c609719bSwdenk* If you modify existing code, make sure that your new code does not
5078c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5079c609719bSwdenk  When adding new features, these should compile conditionally only
5080c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5081c609719bSwdenk  disabled must not need more memory than the old code without your
5082c609719bSwdenk  modification.
508390dc6704Swdenk
50840668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
50850668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
50860668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
50870668236bSWolfgang Denk  bigger than the size limit should be avoided.
5088