xref: /openbmc/u-boot/README (revision c167cc02033e45913ce6a3ba4575e7890ce55f07)
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
38633eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
38733eee330SScott Wood
38833eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
38933eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
39033eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
39133eee330SScott Wood
39233eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
39333eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
39433eee330SScott Wood
39533eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
39633eee330SScott Wood		for which the A004510 workaround should be applied.
39733eee330SScott Wood
39833eee330SScott Wood		The rest of SVR is either not relevant to the decision
39933eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
40033eee330SScott Wood		p2041) or is implied by the build target, which controls
40133eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
40233eee330SScott Wood
40333eee330SScott Wood		See Freescale App Note 4493 for more information about
40433eee330SScott Wood		this erratum.
40533eee330SScott Wood
40633eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
40733eee330SScott Wood
40833eee330SScott Wood		This is the value to write into CCSR offset 0x18600
40933eee330SScott Wood		according to the A004510 workaround.
41033eee330SScott Wood
4116cb461b4SDaniel Schwierzeck- Generic CPU options:
4126cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
4136cb461b4SDaniel Schwierzeck
4146cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
4156cb461b4SDaniel Schwierzeck		values is arch specific.
4166cb461b4SDaniel Schwierzeck
4170b953ffcSMarkus Klotzbuecher- Intel Monahans options:
4186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
4190b953ffcSMarkus Klotzbuecher
4200b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
4210b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
4220b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
4230b953ffcSMarkus Klotzbuecher
4246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
4250b953ffcSMarkus Klotzbuecher
4260b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
4270b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
4280b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
4290b953ffcSMarkus Klotzbuecher		by this value.
4300b953ffcSMarkus Klotzbuecher
43192bbd64eSDaniel Schwierzeck- MIPS CPU options:
43292bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
43392bbd64eSDaniel Schwierzeck
43492bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
43592bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
43692bbd64eSDaniel Schwierzeck		relocation.
43792bbd64eSDaniel Schwierzeck
43892bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
43992bbd64eSDaniel Schwierzeck
44092bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
44192bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
44292bbd64eSDaniel Schwierzeck		Possible values are:
44392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
44492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
44592bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
44692bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
44792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
44892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
44992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
45092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
45192bbd64eSDaniel Schwierzeck
45292bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
45392bbd64eSDaniel Schwierzeck
45492bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
45592bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
45692bbd64eSDaniel Schwierzeck
45792bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
45892bbd64eSDaniel Schwierzeck
45992bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
46092bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
46192bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
46292bbd64eSDaniel Schwierzeck
463b67d8816SChristian Riesch- ARM options:
464b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
465b67d8816SChristian Riesch
466b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
467b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
468b67d8816SChristian Riesch
4695356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
4705356f545SAneesh V
4715356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
4725356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
4735356f545SAneesh V		better code density. For ARM architectures that support
4745356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
4755356f545SAneesh V		GCC.
4765356f545SAneesh V
4775da627a4Swdenk- Linux Kernel Interface:
478c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
479c609719bSwdenk
480c609719bSwdenk		U-Boot stores all clock information in Hz
481c609719bSwdenk		internally. For binary compatibility with older Linux
482c609719bSwdenk		kernels (which expect the clocks passed in the
483c609719bSwdenk		bd_info data to be in MHz) the environment variable
484c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
485c609719bSwdenk		converts clock data to MHZ before passing it to the
486c609719bSwdenk		Linux kernel.
487c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
488c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
489c609719bSwdenk		default environment.
490c609719bSwdenk
4915da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
4925da627a4Swdenk
49311ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
4945da627a4Swdenk		expect it to be in bytes, others in MB.
4955da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
4965da627a4Swdenk
497fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
498f57f70aaSWolfgang Denk
499f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
500213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
501213bf8c8SGerald Van Baren		concepts).
502213bf8c8SGerald Van Baren
503213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
504213bf8c8SGerald Van Baren		 * New libfdt-based support
505213bf8c8SGerald Van Baren		 * Adds the "fdt" command
5063bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
507213bf8c8SGerald Van Baren
508b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
509b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
510b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
511b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
512f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
513c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
514f57f70aaSWolfgang Denk
51511ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
51611ccc33fSMarcel Ziswiler		addresses
5173bb342fcSKim Phillips
5184e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
5194e253137SKumar Gala
5204e253137SKumar Gala		Board code has addition modification that it wants to make
5214e253137SKumar Gala		to the flat device tree before handing it off to the kernel
5226705d81eSwdenk
5230267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
5240267768eSMatthew McClintock
52511ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
5260267768eSMatthew McClintock		param header, the default value is zero if undefined.
5270267768eSMatthew McClintock
5283887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
5293887c3fbSHeiko Schocher
5303887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
5313887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
5323887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
5333887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
5343887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
5353887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
5363887c3fbSHeiko Schocher
5377eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
5387eb29398SIgor Grinberg
5397eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
5407eb29398SIgor Grinberg		machine type and must be used to specify the machine type
5417eb29398SIgor Grinberg		number as it appears in the ARM machine registry
5427eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
5437eb29398SIgor Grinberg		Only boards that have multiple machine types supported
5447eb29398SIgor Grinberg		in a single configuration file and the machine type is
5457eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
5467eb29398SIgor Grinberg
5470b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5480b2f4ecaSNiklaus Giger
5490b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5500b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5510b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5520b2f4ecaSNiklaus Giger
5530b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5540b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5550b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5560b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5570b2f4ecaSNiklaus Giger
5580b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5590b2f4ecaSNiklaus Giger
5600b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5610b2f4ecaSNiklaus Giger
5620b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5630b2f4ecaSNiklaus Giger		the defaults discussed just above.
5640b2f4ecaSNiklaus Giger
5652c451f78SAneesh V- Cache Configuration:
5662c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
5672c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
5682c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
5692c451f78SAneesh V
57093bc2193SAneesh V- Cache Configuration for ARM:
57193bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
57293bc2193SAneesh V				      controller
57393bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
57493bc2193SAneesh V					controller register space
57593bc2193SAneesh V
5766705d81eSwdenk- Serial Ports:
57748d0192fSAndreas Engel		CONFIG_PL010_SERIAL
5786705d81eSwdenk
5796705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
5806705d81eSwdenk
58148d0192fSAndreas Engel		CONFIG_PL011_SERIAL
5826705d81eSwdenk
5836705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
5846705d81eSwdenk
5856705d81eSwdenk		CONFIG_PL011_CLOCK
5866705d81eSwdenk
5876705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
5886705d81eSwdenk		the clock speed of the UARTs.
5896705d81eSwdenk
5906705d81eSwdenk		CONFIG_PL01x_PORTS
5916705d81eSwdenk
5926705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
5936705d81eSwdenk		define this to a list of base addresses for each (supported)
5946705d81eSwdenk		port. See e.g. include/configs/versatile.h
5956705d81eSwdenk
596910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
597910f1ae3SJohn Rigby
598910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
599910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
600910f1ae3SJohn Rigby		this variable to initialize the extra register.
601910f1ae3SJohn Rigby
602910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
603910f1ae3SJohn Rigby
604910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
605910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
606910f1ae3SJohn Rigby		variable to flush the UART at init time.
607910f1ae3SJohn Rigby
6086705d81eSwdenk
609c609719bSwdenk- Console Interface:
610c609719bSwdenk		Depending on board, define exactly one serial port
611c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
612c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
613c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
614c609719bSwdenk
615c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
616c609719bSwdenk		port routines must be defined elsewhere
617c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
618c609719bSwdenk
619c609719bSwdenk		CONFIG_CFB_CONSOLE
620c609719bSwdenk		Enables console device for a color framebuffer. Needs following
621c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
622c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
623c609719bSwdenk						(default big endian)
624c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
625c609719bSwdenk						rectangle fill
626c609719bSwdenk						(cf. smiLynxEM)
627c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
628c609719bSwdenk						bit-blit (cf. smiLynxEM)
629c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
630c609719bSwdenk						(cols=pitch)
631c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
632c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
633c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
634c609719bSwdenk						(0-5, cf. cfb_console.c)
635c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
636c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
637c609719bSwdenk						(i.e. i8042_kbd_init())
638c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
639c609719bSwdenk						(i.e. i8042_tstc)
640c609719bSwdenk			VIDEO_GETC_FCT		get char fct
641c609719bSwdenk						(i.e. i8042_getc)
642c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
643c609719bSwdenk						(requires blink timer
644c609719bSwdenk						cf. i8042.c)
6456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
646c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
647c609719bSwdenk						upper right corner
648602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
649c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
650c609719bSwdenk						upper left corner
651a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
652a6c7ad2fSwdenk						linux_logo.h for logo.
653a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
654c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
65511ccc33fSMarcel Ziswiler						additional board info beside
656c609719bSwdenk						the logo
657c609719bSwdenk
658c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
659c609719bSwdenk		default i/o. Serial console can be forced with
660c609719bSwdenk		environment 'console=serial'.
661c609719bSwdenk
662a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
663a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
664a3ad8e26Swdenk		the "silent" environment variable. See
665a3ad8e26Swdenk		doc/README.silent for more information.
666a3ad8e26Swdenk
667c609719bSwdenk- Console Baudrate:
668c609719bSwdenk		CONFIG_BAUDRATE - in bps
669c609719bSwdenk		Select one of the baudrates listed in
6706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
6716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
672c609719bSwdenk
673c92fac91SHeiko Schocher- Console Rx buffer length
674c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
675c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
6762b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
677c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
678c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
679c92fac91SHeiko Schocher		the SMC.
680c92fac91SHeiko Schocher
6819558b48aSGraeme Russ- Pre-Console Buffer:
6829558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
6839558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
6849558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
6859558b48aSGraeme Russ		buffer any console messages prior to the console being
6869558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
6879558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
6889558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
6899558b48aSGraeme Russ		bytes are output before the console is initialised, the
6909558b48aSGraeme Russ		earlier bytes are discarded.
6919558b48aSGraeme Russ
6929558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
6939558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
6949558b48aSGraeme Russ
695046a37bdSSonny Rao- Safe printf() functions
696046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
697046a37bdSSonny Rao		the printf() functions. These are defined in
698046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
699046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
700046a37bdSSonny Rao		If this option is not given then these functions will
701046a37bdSSonny Rao		silently discard their buffer size argument - this means
702046a37bdSSonny Rao		you are not getting any overflow checking in this case.
703046a37bdSSonny Rao
704c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
705c609719bSwdenk		Delay before automatically booting the default image;
706c609719bSwdenk		set to -1 to disable autoboot.
70793d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
70893d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
709c609719bSwdenk
710c609719bSwdenk		See doc/README.autoboot for these options that
711c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
712c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
713c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
714c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
715c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
716c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
717c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
718c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
719c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
720c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
721c609719bSwdenk		CONFIG_RESET_TO_RETRY
722c609719bSwdenk
723c609719bSwdenk- Autoboot Command:
724c609719bSwdenk		CONFIG_BOOTCOMMAND
725c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
726c609719bSwdenk		define a command string that is automatically executed
727c609719bSwdenk		when no character is read on the console interface
728c609719bSwdenk		within "Boot Delay" after reset.
729c609719bSwdenk
730c609719bSwdenk		CONFIG_BOOTARGS
731c609719bSwdenk		This can be used to pass arguments to the bootm
732c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
733c609719bSwdenk		environment value "bootargs".
734c609719bSwdenk
735c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
736c609719bSwdenk		The value of these goes into the environment as
737c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
738c609719bSwdenk		as a convenience, when switching between booting from
73911ccc33fSMarcel Ziswiler		RAM and NFS.
740c609719bSwdenk
741c609719bSwdenk- Pre-Boot Commands:
742c609719bSwdenk		CONFIG_PREBOOT
743c609719bSwdenk
744c609719bSwdenk		When this option is #defined, the existence of the
745c609719bSwdenk		environment variable "preboot" will be checked
746c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
747c609719bSwdenk		countdown and/or running the auto-boot command resp.
748c609719bSwdenk		entering interactive mode.
749c609719bSwdenk
750c609719bSwdenk		This feature is especially useful when "preboot" is
751c609719bSwdenk		automatically generated or modified. For an example
752c609719bSwdenk		see the LWMON board specific code: here "preboot" is
753c609719bSwdenk		modified when the user holds down a certain
754c609719bSwdenk		combination of keys on the (special) keyboard when
755c609719bSwdenk		booting the systems
756c609719bSwdenk
757c609719bSwdenk- Serial Download Echo Mode:
758c609719bSwdenk		CONFIG_LOADS_ECHO
759c609719bSwdenk		If defined to 1, all characters received during a
760c609719bSwdenk		serial download (using the "loads" command) are
761c609719bSwdenk		echoed back. This might be needed by some terminal
762c609719bSwdenk		emulations (like "cu"), but may as well just take
763c609719bSwdenk		time on others. This setting #define's the initial
764c609719bSwdenk		value of the "loads_echo" environment variable.
765c609719bSwdenk
766602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
767c609719bSwdenk		CONFIG_KGDB_BAUDRATE
768c609719bSwdenk		Select one of the baudrates listed in
7696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
770c609719bSwdenk
771c609719bSwdenk- Monitor Functions:
772602ad3b3SJon Loeliger		Monitor commands can be included or excluded
773602ad3b3SJon Loeliger		from the build by using the #include files
774c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
775c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
776602ad3b3SJon Loeliger		and augmenting with additional #define's
777602ad3b3SJon Loeliger		for wanted commands.
778c609719bSwdenk
779602ad3b3SJon Loeliger		The default command configuration includes all commands
780602ad3b3SJon Loeliger		except those marked below with a "*".
781602ad3b3SJon Loeliger
782602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
783602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
784602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
785602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
786602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
787602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
788602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
789602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
790710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
791602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
792602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
793602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
794a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
795a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
796a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
797a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
798602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
799602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
800246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
801602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
802602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
8030c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
804bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
805602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
806602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
807602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
808602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
809602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
810a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
811a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
812602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
813602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
814602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
815602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
816602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
817602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
8180c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
819*c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
820602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
821602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
822602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
823602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
8241ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
825d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
826d22c338eSJoe Hershberger					  (169.254.*.*)
827602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
828602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
82902c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
83002c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
831602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
83256523f12Swdenk					  loop, loopw, mtest
833602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
834602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
835602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
83668d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
837602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
838602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
839e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
840e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
841602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
842602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
843602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
844602ad3b3SJon Loeliger					  host
845602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
846602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
847602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
848602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
849602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
850602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
851602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
852602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
853602ad3b3SJon Loeliger					  (4xx only)
854f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
855c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
85602c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
85774de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
858602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
8597a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
8601fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
861ca366d0eSChe-liang Chiou		CONFIG_CMD_TIME		* run command and report execution time
862602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
863602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
864c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
865c609719bSwdenk
866c609719bSwdenk
867c609719bSwdenk		EXAMPLE: If you want all functions except of network
868c609719bSwdenk		support you can write:
869c609719bSwdenk
870602ad3b3SJon Loeliger		#include "config_cmd_all.h"
871602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
872c609719bSwdenk
873213bf8c8SGerald Van Baren	Other Commands:
874213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
875c609719bSwdenk
876c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
877602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
878c609719bSwdenk		what you (and your U-Boot users) are doing. Data
879c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
880c609719bSwdenk		8260 (where accesses to the IMMR region must be
881c609719bSwdenk		uncached), and it cannot be disabled on all other
882c609719bSwdenk		systems where we (mis-) use the data cache to hold an
883c609719bSwdenk		initial stack and some data.
884c609719bSwdenk
885c609719bSwdenk
886c609719bSwdenk		XXX - this list needs to get updated!
887c609719bSwdenk
88845ba8077SSimon Glass- Device tree:
88945ba8077SSimon Glass		CONFIG_OF_CONTROL
89045ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
89145ba8077SSimon Glass		to configure its devices, instead of relying on statically
89245ba8077SSimon Glass		compiled #defines in the board file. This option is
89345ba8077SSimon Glass		experimental and only available on a few boards. The device
89445ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
89545ba8077SSimon Glass
8962c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
8972c0f79e4SSimon Glass		be done using one of the two options below:
898bbb0b128SSimon Glass
899bbb0b128SSimon Glass		CONFIG_OF_EMBED
900bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
901bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
902bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
903bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
904bbb0b128SSimon Glass		the global data structure as gd->blob.
90545ba8077SSimon Glass
9062c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
9072c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
9082c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
9092c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
9102c0f79e4SSimon Glass
9112c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
9122c0f79e4SSimon Glass
9132c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
9142c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
9152c0f79e4SSimon Glass		still use the individual files if you need something more
9162c0f79e4SSimon Glass		exotic.
9172c0f79e4SSimon Glass
918c609719bSwdenk- Watchdog:
919c609719bSwdenk		CONFIG_WATCHDOG
920c609719bSwdenk		If this variable is defined, it enables watchdog
9216abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
9226abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
9236abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
9246abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
9256abe6fb6SDetlev Zundel		available, then no further board specific code should
9266abe6fb6SDetlev Zundel		be needed to use it.
9276abe6fb6SDetlev Zundel
9286abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
9296abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
9306abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
9316abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
932c609719bSwdenk
933c1551ea8Sstroese- U-Boot Version:
934c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
935c1551ea8Sstroese		If this variable is defined, an environment variable
936c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
937c1551ea8Sstroese		version as printed by the "version" command.
938a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
939a1ea8e51SBenoît Thébaudeau		next reset.
940c1551ea8Sstroese
941c609719bSwdenk- Real-Time Clock:
942c609719bSwdenk
943602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
944c609719bSwdenk		has to be selected, too. Define exactly one of the
945c609719bSwdenk		following options:
946c609719bSwdenk
947c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
948c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
9494e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
950c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
9511cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
952c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
9537f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
9543bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
9559536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
9564c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
9576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
95871d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
95971d19f30SHeiko Schocher					  RV3029 RTC.
960c609719bSwdenk
961b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
962b37c7e5eSwdenk		must also be configured. See I2C Support, below.
963b37c7e5eSwdenk
964e92739d3SPeter Tyser- GPIO Support:
965e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
966e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
967e92739d3SPeter Tyser
9685dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
9695dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
9705dec49caSChris Packham		pins supported by a particular chip.
9715dec49caSChris Packham
972e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
973e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
974e92739d3SPeter Tyser
975c609719bSwdenk- Timestamp Support:
976c609719bSwdenk
977c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
978c609719bSwdenk		(date and time) of an image is printed by image
979c609719bSwdenk		commands like bootm or iminfo. This option is
980602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
981c609719bSwdenk
982923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
983923c46f9SKarl O. Pinc		Zero or more of the following:
984923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
985923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
986923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
987923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
988923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
989923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
990923c46f9SKarl O. Pinc				       disk/part_efi.c
991923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
992c609719bSwdenk
993602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
994218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
995923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
996c609719bSwdenk
997c609719bSwdenk- IDE Reset method:
9984d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
9994d13cbadSwdenk		board configurations files but used nowhere!
1000c609719bSwdenk
10014d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
10024d13cbadSwdenk		be performed by calling the function
10034d13cbadSwdenk			ide_set_reset(int reset)
10044d13cbadSwdenk		which has to be defined in a board specific file
1005c609719bSwdenk
1006c609719bSwdenk- ATAPI Support:
1007c609719bSwdenk		CONFIG_ATAPI
1008c609719bSwdenk
1009c609719bSwdenk		Set this to enable ATAPI support.
1010c609719bSwdenk
1011c40b2956Swdenk- LBA48 Support
1012c40b2956Swdenk		CONFIG_LBA48
1013c40b2956Swdenk
1014c40b2956Swdenk		Set this to enable support for disks larger than 137GB
10154b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1016c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1017c40b2956Swdenk		support disks up to 2.1TB.
1018c40b2956Swdenk
10196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1020c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1021c40b2956Swdenk			Default is 32bit.
1022c40b2956Swdenk
1023c609719bSwdenk- SCSI Support:
1024c609719bSwdenk		At the moment only there is only support for the
1025c609719bSwdenk		SYM53C8XX SCSI controller; define
1026c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1027c609719bSwdenk
10286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
10296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
10306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1031c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1032c609719bSwdenk		devices.
10336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1034c609719bSwdenk
1035c609719bSwdenk- NETWORK Support (PCI):
1036682011ffSwdenk		CONFIG_E1000
1037ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1038ce5207e1SKyle Moffett
1039ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1040ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1041ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1042ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1043ce5207e1SKyle Moffett
1044ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1045ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1046ce5207e1SKyle Moffett		example with the "sspi" command.
1047ce5207e1SKyle Moffett
1048ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1049ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1050ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1051682011ffSwdenk
1052ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
105311ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1054ac3315c2SAndre Schwarz
1055c609719bSwdenk		CONFIG_EEPRO100
1056c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
105711ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1058c609719bSwdenk		write routine for first time initialisation.
1059c609719bSwdenk
1060c609719bSwdenk		CONFIG_TULIP
1061c609719bSwdenk		Support for Digital 2114x chips.
1062c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1063c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1064c609719bSwdenk
1065c609719bSwdenk		CONFIG_NATSEMI
1066c609719bSwdenk		Support for National dp83815 chips.
1067c609719bSwdenk
1068c609719bSwdenk		CONFIG_NS8382X
1069c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1070c609719bSwdenk
107145219c46Swdenk- NETWORK Support (other):
107245219c46Swdenk
1073c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1074c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1075c041e9d2SJens Scharsig
1076c041e9d2SJens Scharsig			CONFIG_RMII
1077c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1078c041e9d2SJens Scharsig
1079c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1080c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1081c041e9d2SJens Scharsig			The driver doen't show link status messages.
1082c041e9d2SJens Scharsig
1083efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1084efdd7319SRob Herring		Support for the Calxeda XGMAC device
1085efdd7319SRob Herring
108645219c46Swdenk		CONFIG_DRIVER_LAN91C96
108745219c46Swdenk		Support for SMSC's LAN91C96 chips.
108845219c46Swdenk
108945219c46Swdenk			CONFIG_LAN91C96_BASE
109045219c46Swdenk			Define this to hold the physical address
109145219c46Swdenk			of the LAN91C96's I/O space
109245219c46Swdenk
109345219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
109445219c46Swdenk			Define this to enable 32 bit addressing
109545219c46Swdenk
1096f39748aeSwdenk		CONFIG_DRIVER_SMC91111
1097f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1098f39748aeSwdenk
1099f39748aeSwdenk			CONFIG_SMC91111_BASE
1100f39748aeSwdenk			Define this to hold the physical address
1101f39748aeSwdenk			of the device (I/O space)
1102f39748aeSwdenk
1103f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1104f39748aeSwdenk			Define this if data bus is 32 bits
1105f39748aeSwdenk
1106f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1107f39748aeSwdenk			Define this to use i/o functions instead of macros
1108f39748aeSwdenk			(some hardware wont work with macros)
1109f39748aeSwdenk
1110dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1111dc02badaSHeiko Schocher		Support for davinci emac
1112dc02badaSHeiko Schocher
1113dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1114dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1115dc02badaSHeiko Schocher
1116b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1117b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1118b3dbf4a5SMacpaul Lin
1119b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1120b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1121b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1122b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1123b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1124b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1125b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1126b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1127b3dbf4a5SMacpaul Lin
1128c2fff331SMike Rapoport		CONFIG_SMC911X
1129557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1130557b377dSJens Gehrlein
1131c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1132557b377dSJens Gehrlein			Define this to hold the physical address
1133557b377dSJens Gehrlein			of the device (I/O space)
1134557b377dSJens Gehrlein
1135c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1136557b377dSJens Gehrlein			Define this if data bus is 32 bits
1137557b377dSJens Gehrlein
1138c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1139557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1140557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1141c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1142557b377dSJens Gehrlein
11433d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
11443d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
11453d0075faSYoshihiro Shimoda
11463d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
11473d0075faSYoshihiro Shimoda			Define the number of ports to be used
11483d0075faSYoshihiro Shimoda
11493d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
11503d0075faSYoshihiro Shimoda			Define the ETH PHY's address
11513d0075faSYoshihiro Shimoda
115268260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
115368260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
115468260aabSYoshihiro Shimoda
11555e124724SVadim Bendebury- TPM Support:
11565e124724SVadim Bendebury		CONFIG_GENERIC_LPC_TPM
11575e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
11585e124724SVadim Bendebury		per system is supported at this time.
11595e124724SVadim Bendebury
11605e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
11615e124724SVadim Bendebury			Base address where the generic TPM device is mapped
11625e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
11635e124724SVadim Bendebury			0xfed40000.
11645e124724SVadim Bendebury
1165c609719bSwdenk- USB Support:
1166c609719bSwdenk		At the moment only the UHCI host controller is
11674d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1168c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1169c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
117030d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1171c609719bSwdenk		storage devices.
1172c609719bSwdenk		Note:
1173c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1174c609719bSwdenk		(TEAC FD-05PUB).
11754d13cbadSwdenk		MPC5200 USB requires additional defines:
11764d13cbadSwdenk			CONFIG_USB_CLOCK
11774d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1178307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1179307ecb6dSEric Millbrandt				for USB on PSC3
11804d13cbadSwdenk			CONFIG_USB_CONFIG
11814d13cbadSwdenk				for differential drivers: 0x00001000
11824d13cbadSwdenk				for single ended drivers: 0x00005000
1183307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1184307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
11856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1186fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1187fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
11884d13cbadSwdenk
11899ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
11909ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
11919ab4ce22SSimon Glass
119216c8d5e7SWolfgang Denk- USB Device:
119316c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
119416c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
119516c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
119611ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
119716c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
119816c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
119916c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
120016c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
120116c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
120216c8d5e7SWolfgang Denk		a Linux host by
120316c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
120416c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
120516c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
120616c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
120716c8d5e7SWolfgang Denk
120816c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
120916c8d5e7SWolfgang Denk			Define this to build a UDC device
121016c8d5e7SWolfgang Denk
121116c8d5e7SWolfgang Denk			CONFIG_USB_TTY
121216c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
121316c8d5e7SWolfgang Denk			talk to the UDC device
121416c8d5e7SWolfgang Denk
1215f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1216f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1217f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1218f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1219f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1220f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1221f9da0f89SVipin KUMAR			speed.
1222f9da0f89SVipin KUMAR
12236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
122416c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
122516c8d5e7SWolfgang Denk			be set to usbtty.
122616c8d5e7SWolfgang Denk
122716c8d5e7SWolfgang Denk			mpc8xx:
12286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
122916c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
12306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
123116c8d5e7SWolfgang Denk
12326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
123316c8d5e7SWolfgang Denk				Derive USB clock from brgclk
12346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
123516c8d5e7SWolfgang Denk
123616c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
123716c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
123816c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
123916c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
124016c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
124116c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
124216c8d5e7SWolfgang Denk
124316c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
124416c8d5e7SWolfgang Denk			Define this string as the name of your company for
124516c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
124616c8d5e7SWolfgang Denk
124716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
124816c8d5e7SWolfgang Denk			Define this string as the name of your product
124916c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
125016c8d5e7SWolfgang Denk
125116c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
125216c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
125316c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
125416c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
125516c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
125616c8d5e7SWolfgang Denk
125716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
125816c8d5e7SWolfgang Denk			Define this as the unique Product ID
125916c8d5e7SWolfgang Denk			for your device
126016c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1261c609719bSwdenk
1262d70a560fSIgor Grinberg- ULPI Layer Support:
1263d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1264d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1265d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1266d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1267d70a560fSIgor Grinberg		viewport is supported.
1268d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1269d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
1270c609719bSwdenk
1271c609719bSwdenk- MMC Support:
1272c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1273c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1274c609719bSwdenk		accessed from the boot prompt by mapping the device
1275c609719bSwdenk		to physical memory similar to flash. Command line is
1276602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1277602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1278c609719bSwdenk
1279afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1280afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1281afb35666SYoshihiro Shimoda
1282afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1283afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1284afb35666SYoshihiro Shimoda
1285afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1286afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1287afb35666SYoshihiro Shimoda
12886705d81eSwdenk- Journaling Flash filesystem support:
12896705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
12906705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
12916705d81eSwdenk		Define these for a default partition on a NAND device
12926705d81eSwdenk
12936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
12946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
12956705d81eSwdenk		Define these for a default partition on a NOR device
12966705d81eSwdenk
12976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
12986705d81eSwdenk		Define this to create an own partition. You have to provide a
12996705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
13006705d81eSwdenk
13016705d81eSwdenk		If you define only one JFFS2 partition you may also want to
13026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
13036705d81eSwdenk		to disable the command chpart. This is the default when you
13046705d81eSwdenk		have not defined a custom partition
13056705d81eSwdenk
1306c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1307c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1308656f4c65SDonggeun Kim
1309656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1310656f4c65SDonggeun Kim		file in FAT formatted partition.
1311656f4c65SDonggeun Kim
1312656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1313656f4c65SDonggeun Kim		user to write files to FAT.
1314c30a15e5SDonggeun Kim
1315c609719bSwdenk- Keyboard Support:
1316c609719bSwdenk		CONFIG_ISA_KEYBOARD
1317c609719bSwdenk
1318c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1319c609719bSwdenk		support
1320c609719bSwdenk
1321c609719bSwdenk		CONFIG_I8042_KBD
1322c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1323c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1324c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1325c609719bSwdenk		for cfb_console. Supports cursor blinking.
1326c609719bSwdenk
1327c609719bSwdenk- Video support:
1328c609719bSwdenk		CONFIG_VIDEO
1329c609719bSwdenk
1330c609719bSwdenk		Define this to enable video support (for output to
1331c609719bSwdenk		video).
1332c609719bSwdenk
1333c609719bSwdenk		CONFIG_VIDEO_CT69000
1334c609719bSwdenk
1335c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1336c609719bSwdenk
1337c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1338eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1339eeb1b77bSwdenk		video output is selected via environment 'videoout'
1340eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1341eeb1b77bSwdenk		assumed.
1342c609719bSwdenk
1343eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
134411ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1345eeb1b77bSwdenk		are possible:
1346eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1347eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1348eeb1b77bSwdenk
1349eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1350eeb1b77bSwdenk		-------------+---------------------------------------------
1351eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1352eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1353eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1354eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1355eeb1b77bSwdenk		-------------+---------------------------------------------
1356c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1357c609719bSwdenk
1358eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
13597817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1360eeb1b77bSwdenk
1361eeb1b77bSwdenk
1362a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1363a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1364a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1365a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1366a6c7ad2fSwdenk
13677d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
13687d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
13697d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
13707d3053fbSTimur Tabi		support, and should also define these other macros:
13717d3053fbSTimur Tabi
13727d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
13737d3053fbSTimur Tabi			CONFIG_VIDEO
13747d3053fbSTimur Tabi			CONFIG_CMD_BMP
13757d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
13767d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
13777d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
13787d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
13797d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
13807d3053fbSTimur Tabi
1381ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1382ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1383ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1384ba8e76bdSTimur Tabi		description of this variable.
13857d3053fbSTimur Tabi
1386682011ffSwdenk- Keyboard Support:
1387682011ffSwdenk		CONFIG_KEYBOARD
1388682011ffSwdenk
1389682011ffSwdenk		Define this to enable a custom keyboard support.
1390682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1391682011ffSwdenk		defined in your board-specific files.
1392682011ffSwdenk		The only board using this so far is RBC823.
1393a6c7ad2fSwdenk
1394c609719bSwdenk- LCD Support:	CONFIG_LCD
1395c609719bSwdenk
1396c609719bSwdenk		Define this to enable LCD support (for output to LCD
1397c609719bSwdenk		display); also select one of the supported displays
1398c609719bSwdenk		by defining one of these:
1399c609719bSwdenk
140039cf4804SStelian Pop		CONFIG_ATMEL_LCD:
140139cf4804SStelian Pop
140239cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
140339cf4804SStelian Pop
1404fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1405c609719bSwdenk
1406fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1407c609719bSwdenk
1408fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1409c609719bSwdenk
1410fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1411fd3103bbSwdenk			Active, color, single scan.
1412fd3103bbSwdenk
1413fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1414fd3103bbSwdenk
1415fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1416c609719bSwdenk			Active, color, single scan.
1417c609719bSwdenk
1418c609719bSwdenk		CONFIG_SHARP_16x9
1419c609719bSwdenk
1420c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1421c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1422c609719bSwdenk
1423c609719bSwdenk		CONFIG_SHARP_LQ64D341
1424c609719bSwdenk
1425c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1426c609719bSwdenk			Active, color, single scan.
1427c609719bSwdenk
1428c609719bSwdenk		CONFIG_HLD1045
1429c609719bSwdenk
1430c609719bSwdenk			HLD1045 display, 640x480.
1431c609719bSwdenk			Active, color, single scan.
1432c609719bSwdenk
1433c609719bSwdenk		CONFIG_OPTREX_BW
1434c609719bSwdenk
1435c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1436c609719bSwdenk			or
1437c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1438c609719bSwdenk			or
1439c609719bSwdenk			Hitachi	 SP14Q002
1440c609719bSwdenk
1441c609719bSwdenk			320x240. Black & white.
1442c609719bSwdenk
1443c609719bSwdenk		Normally display is black on white background; define
14446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1445c609719bSwdenk
14467152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1447d791b1dcSwdenk
1448d791b1dcSwdenk		If this option is set, the environment is checked for
1449d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1450d791b1dcSwdenk		of logo, copyright and system information on the LCD
1451e94d2cd9Swdenk		is suppressed and the BMP image at the address
1452d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1453d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1454d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1455d791b1dcSwdenk		loaded very quickly after power-on.
1456d791b1dcSwdenk
14571ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
14581ca298ceSMatthias Weisser
14591ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
14601ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
14611ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
14621ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
14631ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
14641ca298ceSMatthias Weisser		specify 'm' for centering the image.
14651ca298ceSMatthias Weisser
14661ca298ceSMatthias Weisser		Example:
14671ca298ceSMatthias Weisser		setenv splashpos m,m
14681ca298ceSMatthias Weisser			=> image at center of screen
14691ca298ceSMatthias Weisser
14701ca298ceSMatthias Weisser		setenv splashpos 30,20
14711ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
14721ca298ceSMatthias Weisser
14731ca298ceSMatthias Weisser		setenv splashpos -10,m
14741ca298ceSMatthias Weisser			=> vertically centered image
14751ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
14761ca298ceSMatthias Weisser
147798f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
147898f4a3dfSStefan Roese
147998f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
148098f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
148198f4a3dfSStefan Roese		splashscreen support or the bmp command.
148298f4a3dfSStefan Roese
1483d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1484d5011762SAnatolij Gustschin
1485d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1486d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1487d5011762SAnatolij Gustschin		bmp command.
1488d5011762SAnatolij Gustschin
1489f2b96dfbSLei Wen- Do compresssing for memory range:
1490f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1491f2b96dfbSLei Wen
1492f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1493f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1494f2b96dfbSLei Wen
1495c29fdfc1Swdenk- Compression support:
1496c29fdfc1Swdenk		CONFIG_BZIP2
1497c29fdfc1Swdenk
1498c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1499c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1500c29fdfc1Swdenk		compressed images are supported.
1501c29fdfc1Swdenk
1502c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
15036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1504c29fdfc1Swdenk		be at least 4MB.
1505d791b1dcSwdenk
1506fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1507fc9c1727SLuigi 'Comio' Mantellini
1508fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1509fc9c1727SLuigi 'Comio' Mantellini		images is included.
1510fc9c1727SLuigi 'Comio' Mantellini
1511fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1512fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1513fc9c1727SLuigi 'Comio' Mantellini		formula:
1514fc9c1727SLuigi 'Comio' Mantellini
1515fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1516fc9c1727SLuigi 'Comio' Mantellini
1517fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1518fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1519fc9c1727SLuigi 'Comio' Mantellini
1520fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1521fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1522fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1523fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1524fc9c1727SLuigi 'Comio' Mantellini
1525fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1526fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
15276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1528fc9c1727SLuigi 'Comio' Mantellini
152917ea1177Swdenk- MII/PHY support:
153017ea1177Swdenk		CONFIG_PHY_ADDR
153117ea1177Swdenk
153217ea1177Swdenk		The address of PHY on MII bus.
153317ea1177Swdenk
153417ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
153517ea1177Swdenk
153617ea1177Swdenk		The clock frequency of the MII bus
153717ea1177Swdenk
153817ea1177Swdenk		CONFIG_PHY_GIGE
153917ea1177Swdenk
154017ea1177Swdenk		If this option is set, support for speed/duplex
154111ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
154217ea1177Swdenk
154317ea1177Swdenk		CONFIG_PHY_RESET_DELAY
154417ea1177Swdenk
154517ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
154617ea1177Swdenk		reset before any MII register access is possible.
154717ea1177Swdenk		For such PHY, set this option to the usec delay
154817ea1177Swdenk		required. (minimum 300usec for LXT971A)
154917ea1177Swdenk
155017ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
155117ea1177Swdenk
155217ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
155317ea1177Swdenk		command issued before MII status register can be read
155417ea1177Swdenk
1555c609719bSwdenk- Ethernet address:
1556c609719bSwdenk		CONFIG_ETHADDR
1557c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1558c609719bSwdenk		CONFIG_ETH2ADDR
1559c609719bSwdenk		CONFIG_ETH3ADDR
1560c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1561c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1562c609719bSwdenk
156311ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
156411ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1565c609719bSwdenk		is not determined automatically.
1566c609719bSwdenk
1567c609719bSwdenk- IP address:
1568c609719bSwdenk		CONFIG_IPADDR
1569c609719bSwdenk
1570c609719bSwdenk		Define a default value for the IP address to use for
157111ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1572c609719bSwdenk		determined through e.g. bootp.
15731ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1574c609719bSwdenk
1575c609719bSwdenk- Server IP address:
1576c609719bSwdenk		CONFIG_SERVERIP
1577c609719bSwdenk
1578c609719bSwdenk		Defines a default value for the IP address of a TFTP
1579c609719bSwdenk		server to contact when using the "tftboot" command.
15801ebcd654SWolfgang Denk		(Environment variable "serverip")
1581c609719bSwdenk
158297cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
158397cfe861SRobin Getz
158497cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
158597cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
158697cfe861SRobin Getz
15871ebcd654SWolfgang Denk- Gateway IP address:
15881ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
15891ebcd654SWolfgang Denk
15901ebcd654SWolfgang Denk		Defines a default value for the IP address of the
15911ebcd654SWolfgang Denk		default router where packets to other networks are
15921ebcd654SWolfgang Denk		sent to.
15931ebcd654SWolfgang Denk		(Environment variable "gatewayip")
15941ebcd654SWolfgang Denk
15951ebcd654SWolfgang Denk- Subnet mask:
15961ebcd654SWolfgang Denk		CONFIG_NETMASK
15971ebcd654SWolfgang Denk
15981ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
15991ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
16001ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
16011ebcd654SWolfgang Denk		forwarded through a router.
16021ebcd654SWolfgang Denk		(Environment variable "netmask")
16031ebcd654SWolfgang Denk
160453a5c424SDavid Updegraff- Multicast TFTP Mode:
160553a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
160653a5c424SDavid Updegraff
160753a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
160853a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
160911ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
161053a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
161153a5c424SDavid Updegraff		multicast group.
161253a5c424SDavid Updegraff
1613c609719bSwdenk- BOOTP Recovery Mode:
1614c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1615c609719bSwdenk
1616c609719bSwdenk		If you have many targets in a network that try to
1617c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1618c609719bSwdenk		systems send out BOOTP requests at precisely the same
1619c609719bSwdenk		moment (which would happen for instance at recovery
1620c609719bSwdenk		from a power failure, when all systems will try to
1621c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1622c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1623c609719bSwdenk		inserted before sending out BOOTP requests. The
16246c33c785SWolfgang Denk		following delays are inserted then:
1625c609719bSwdenk
1626c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1627c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1628c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1629c609719bSwdenk		4th and following
1630c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1631c609719bSwdenk
1632fe389a82Sstroese- DHCP Advanced Options:
16331fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
16341fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1635fe389a82Sstroese
16361fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
16371fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
16381fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
16391fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
16401fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
16411fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
16421fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
16431fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
16441fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
16451fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
16461fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
16471fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
16482c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1649fe389a82Sstroese
16505d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
16515d110f0aSWilson Callan		environment variable, not the BOOTP server.
1652fe389a82Sstroese
16532c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
16542c00e099SJoe Hershberger		after the configured retry count, the call will fail
16552c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
16562c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
16572c00e099SJoe Hershberger		is not available.
16582c00e099SJoe Hershberger
1659fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1660fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1661fe389a82Sstroese		than one DNS serverip is offered to the client.
1662fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1663fe389a82Sstroese		serverip will be stored in the additional environment
1664fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1665fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
16661fe80d79SJon Loeliger		is defined.
1667fe389a82Sstroese
1668fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1669fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1670fe389a82Sstroese		need the hostname of the DHCP requester.
16715d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
16721fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
16731fe80d79SJon Loeliger		option 12 to the DHCP server.
1674fe389a82Sstroese
1675d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1676d9a2f416SAras Vaichas
1677d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1678d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1679d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1680d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1681d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1682d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1683d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1684d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1685d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1686d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1687d9a2f416SAras Vaichas		this delay.
1688d9a2f416SAras Vaichas
1689d22c338eSJoe Hershberger - Link-local IP address negotiation:
1690d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1691d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1692d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1693d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1694d22c338eSJoe Hershberger
1695d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1696d22c338eSJoe Hershberger
1697a3d991bdSwdenk - CDP Options:
1698a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1699a3d991bdSwdenk
1700a3d991bdSwdenk		The device id used in CDP trigger frames.
1701a3d991bdSwdenk
1702a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1703a3d991bdSwdenk
1704a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1705a3d991bdSwdenk		of the device.
1706a3d991bdSwdenk
1707a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1708a3d991bdSwdenk
1709a3d991bdSwdenk		A printf format string which contains the ascii name of
1710a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
171111ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1712a3d991bdSwdenk
1713a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1714a3d991bdSwdenk
1715a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1716a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1717a3d991bdSwdenk
1718a3d991bdSwdenk		CONFIG_CDP_VERSION
1719a3d991bdSwdenk
1720a3d991bdSwdenk		An ascii string containing the version of the software.
1721a3d991bdSwdenk
1722a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1723a3d991bdSwdenk
1724a3d991bdSwdenk		An ascii string containing the name of the platform.
1725a3d991bdSwdenk
1726a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1727a3d991bdSwdenk
1728a3d991bdSwdenk		A 32bit integer sent on the trigger.
1729a3d991bdSwdenk
1730a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1731a3d991bdSwdenk
1732a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1733a3d991bdSwdenk		device in .1 of milliwatts.
1734a3d991bdSwdenk
1735a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1736a3d991bdSwdenk
1737a3d991bdSwdenk		A byte containing the id of the VLAN.
1738a3d991bdSwdenk
1739c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1740c609719bSwdenk
1741c609719bSwdenk		Several configurations allow to display the current
1742c609719bSwdenk		status using a LED. For instance, the LED will blink
1743c609719bSwdenk		fast while running U-Boot code, stop blinking as
1744c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1745c609719bSwdenk		start blinking slow once the Linux kernel is running
1746c609719bSwdenk		(supported by a status LED driver in the Linux
1747c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1748c609719bSwdenk		feature in U-Boot.
1749c609719bSwdenk
1750c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1751c609719bSwdenk
1752c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1753c609719bSwdenk		on those systems that support this (optional)
1754c609719bSwdenk		feature, like the TQM8xxL modules.
1755c609719bSwdenk
1756c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1757c609719bSwdenk
1758b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1759b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
176011ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1761c609719bSwdenk
1762b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1763602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1764b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1765b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1766c609719bSwdenk		command line interface.
1767c609719bSwdenk
1768bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1769c609719bSwdenk
1770b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1771b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1772b37c7e5eSwdenk		support for I2C.
1773c609719bSwdenk
1774b37c7e5eSwdenk		There are several other quantities that must also be
1775b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1776c609719bSwdenk
17776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1778b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
17796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
178011ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1781c609719bSwdenk
17828d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1783a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
17848d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
17858d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
17868d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1787b37c7e5eSwdenk
17885da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
17895da71efaSEric Millbrandt
17905da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
17915da71efaSEric Millbrandt		chips might think that the current transfer is still
17925da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
17935da71efaSEric Millbrandt		commands until the slave device responds.
17945da71efaSEric Millbrandt
1795b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1796b37c7e5eSwdenk
1797b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1798b37c7e5eSwdenk		then the following macros need to be defined (examples are
1799b37c7e5eSwdenk		from include/configs/lwmon.h):
1800c609719bSwdenk
1801c609719bSwdenk		I2C_INIT
1802c609719bSwdenk
1803b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1804c609719bSwdenk		controller or configure ports.
1805c609719bSwdenk
1806b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1807b37c7e5eSwdenk
1808c609719bSwdenk		I2C_PORT
1809c609719bSwdenk
1810c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1811c609719bSwdenk		assumes both bits are on the same port). Valid values
1812c609719bSwdenk		are 0..3 for ports A..D.
1813c609719bSwdenk
1814c609719bSwdenk		I2C_ACTIVE
1815c609719bSwdenk
1816c609719bSwdenk		The code necessary to make the I2C data line active
1817c609719bSwdenk		(driven).  If the data line is open collector, this
1818c609719bSwdenk		define can be null.
1819c609719bSwdenk
1820b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1821b37c7e5eSwdenk
1822c609719bSwdenk		I2C_TRISTATE
1823c609719bSwdenk
1824c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1825c609719bSwdenk		(inactive).  If the data line is open collector, this
1826c609719bSwdenk		define can be null.
1827c609719bSwdenk
1828b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1829b37c7e5eSwdenk
1830c609719bSwdenk		I2C_READ
1831c609719bSwdenk
1832c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1833c609719bSwdenk		FALSE if it is low.
1834c609719bSwdenk
1835b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1836b37c7e5eSwdenk
1837c609719bSwdenk		I2C_SDA(bit)
1838c609719bSwdenk
1839c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1840c609719bSwdenk		is FALSE, it clears it (low).
1841c609719bSwdenk
1842b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1843b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1844b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1845b37c7e5eSwdenk
1846c609719bSwdenk		I2C_SCL(bit)
1847c609719bSwdenk
1848c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1849c609719bSwdenk		is FALSE, it clears it (low).
1850c609719bSwdenk
1851b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1852b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1853b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1854b37c7e5eSwdenk
1855c609719bSwdenk		I2C_DELAY
1856c609719bSwdenk
1857c609719bSwdenk		This delay is invoked four times per clock cycle so this
1858c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1859b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1860b37c7e5eSwdenk		like:
1861b37c7e5eSwdenk
1862b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1863c609719bSwdenk
1864793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1865793b5726SMike Frysinger
1866793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
1867793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
1868793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
1869793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
1870793b5726SMike Frysinger
1871793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
1872793b5726SMike Frysinger		the generic GPIO functions.
1873793b5726SMike Frysinger
18746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
187547cd00faSwdenk
187647cd00faSwdenk		When a board is reset during an i2c bus transfer
187747cd00faSwdenk		chips might think that the current transfer is still
187847cd00faSwdenk		in progress. On some boards it is possible to access
187947cd00faSwdenk		the i2c SCLK line directly, either by using the
188047cd00faSwdenk		processor pin as a GPIO or by having a second pin
188147cd00faSwdenk		connected to the bus. If this option is defined a
188247cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
188347cd00faSwdenk		is run early in the boot sequence.
188447cd00faSwdenk
188526a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
188626a33504SRichard Retanubun
188726a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
188826a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
188926a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
189026a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
189126a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
189226a33504SRichard Retanubun		controller provide such a method. It is called at the end of
189326a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
189426a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
189526a33504SRichard Retanubun
189617ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
189717ea1177Swdenk
189817ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
189917ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
190017ea1177Swdenk		variable "i2cfast". (see also i2cfast)
190117ea1177Swdenk
1902bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1903bb99ad6dSBen Warren
1904bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1905bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
1906bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
1907bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1908bb99ad6dSBen Warren
19096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
1910bb99ad6dSBen Warren
1911bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
19120f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
19130f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
19140f89c54bSPeter Tyser		a 1D array of device addresses
1915bb99ad6dSBen Warren
1916bb99ad6dSBen Warren		e.g.
1917bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
19186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
1919bb99ad6dSBen Warren
1920bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1921bb99ad6dSBen Warren
1922bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
19236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1924bb99ad6dSBen Warren
1925bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1926bb99ad6dSBen Warren
19276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
1928be5e6181STimur Tabi
1929be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1930be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1931be5e6181STimur Tabi
19326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
19330dc018ecSStefan Roese
19340dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
19350dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
19360dc018ecSStefan Roese
19376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
19380dc018ecSStefan Roese
19390dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
19400dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
19410dc018ecSStefan Roese
19426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
19439ebbb54fSVictor Gallardo
19449ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
19459ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
19469ebbb54fSVictor Gallardo		specified DTT device.
19479ebbb54fSVictor Gallardo
1948be5e6181STimur Tabi		CONFIG_FSL_I2C
1949be5e6181STimur Tabi
1950be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
19517817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1952be5e6181STimur Tabi
195367b23a32SHeiko Schocher		CONFIG_I2C_MUX
195467b23a32SHeiko Schocher
195567b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
195667b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
195767b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
195867b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
195967b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
196067b23a32SHeiko Schocher		the muxes to activate this new "bus".
196167b23a32SHeiko Schocher
196267b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
196367b23a32SHeiko Schocher		feature!
196467b23a32SHeiko Schocher
196567b23a32SHeiko Schocher		Example:
196667b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
196767b23a32SHeiko Schocher			The First mux with address 70 and channel 6
196867b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
196967b23a32SHeiko Schocher
197067b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
197167b23a32SHeiko Schocher
197267b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
197367b23a32SHeiko Schocher		of I2C Busses with muxes:
197467b23a32SHeiko Schocher
197567b23a32SHeiko Schocher		=> i2c bus
197667b23a32SHeiko Schocher		Busses reached over muxes:
197767b23a32SHeiko Schocher		Bus ID: 2
197867b23a32SHeiko Schocher		  reached over Mux(es):
197967b23a32SHeiko Schocher		    pca9544a@70 ch: 4
198067b23a32SHeiko Schocher		Bus ID: 3
198167b23a32SHeiko Schocher		  reached over Mux(es):
198267b23a32SHeiko Schocher		    pca9544a@70 ch: 6
198367b23a32SHeiko Schocher		    pca9544a@71 ch: 4
198467b23a32SHeiko Schocher		=>
198567b23a32SHeiko Schocher
198667b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
1987f9a78b8dSMichael Jones		u-boot first sends the command to the mux@70 to enable
1988f9a78b8dSMichael Jones		channel 6, and then the command to the mux@71 to enable
198967b23a32SHeiko Schocher		the channel 4.
199067b23a32SHeiko Schocher
199167b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
1992f9a78b8dSMichael Jones		usual to communicate with your I2C devices behind
199367b23a32SHeiko Schocher		the 2 muxes.
199467b23a32SHeiko Schocher
199567b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
199667b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
199767b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
199867b23a32SHeiko Schocher		to add this option to other architectures.
199967b23a32SHeiko Schocher
20002ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
20012ac6985aSAndrew Dyer
20022ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
20032ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
20042ac6985aSAndrew Dyer		between writing the address pointer and reading the
20052ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
20062ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
20072ac6985aSAndrew Dyer		devices can use either method, but some require one or
20082ac6985aSAndrew Dyer		the other.
2009be5e6181STimur Tabi
2010c609719bSwdenk- SPI Support:	CONFIG_SPI
2011c609719bSwdenk
2012c609719bSwdenk		Enables SPI driver (so far only tested with
2013c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2014c609719bSwdenk		D/As on the SACSng board)
2015c609719bSwdenk
20166639562eSYoshihiro Shimoda		CONFIG_SH_SPI
20176639562eSYoshihiro Shimoda
20186639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
20196639562eSYoshihiro Shimoda		only SH7757 is supported.
20206639562eSYoshihiro Shimoda
2021c609719bSwdenk		CONFIG_SPI_X
2022c609719bSwdenk
2023c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2024c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2025c609719bSwdenk
2026c609719bSwdenk		CONFIG_SOFT_SPI
2027c609719bSwdenk
2028c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2029c609719bSwdenk		using hardware support. This is a general purpose
2030c609719bSwdenk		driver that only requires three general I/O port pins
2031c609719bSwdenk		(two outputs, one input) to function. If this is
2032c609719bSwdenk		defined, the board configuration must define several
2033c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2034c609719bSwdenk		an example, see include/configs/sacsng.h.
2035c609719bSwdenk
203604a9e118SBen Warren		CONFIG_HARD_SPI
203704a9e118SBen Warren
203804a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
203904a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
204004a9e118SBen Warren		must define a list of chip-select function pointers.
204104a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
204204a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
204304a9e118SBen Warren
204438254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
204538254f45SGuennadi Liakhovetski
204638254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
20472e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
204838254f45SGuennadi Liakhovetski
20490133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
20500133502eSMatthias Fuchs
20510133502eSMatthias Fuchs		Enables FPGA subsystem.
20520133502eSMatthias Fuchs
20530133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
20540133502eSMatthias Fuchs
20550133502eSMatthias Fuchs		Enables support for specific chip vendors.
20560133502eSMatthias Fuchs		(ALTERA, XILINX)
20570133502eSMatthias Fuchs
20580133502eSMatthias Fuchs		CONFIG_FPGA_<family>
20590133502eSMatthias Fuchs
20600133502eSMatthias Fuchs		Enables support for FPGA family.
20610133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
20620133502eSMatthias Fuchs
20630133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2064c609719bSwdenk
2065c609719bSwdenk		Specify the number of FPGA devices to support.
2066c609719bSwdenk
20676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2068c609719bSwdenk
2069c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2070c609719bSwdenk
20716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2072c609719bSwdenk
2073c609719bSwdenk		Enable checks on FPGA configuration interface busy
2074c609719bSwdenk		status by the configuration function. This option
2075c609719bSwdenk		will require a board or device specific function to
2076c609719bSwdenk		be written.
2077c609719bSwdenk
2078c609719bSwdenk		CONFIG_FPGA_DELAY
2079c609719bSwdenk
2080c609719bSwdenk		If defined, a function that provides delays in the FPGA
2081c609719bSwdenk		configuration driver.
2082c609719bSwdenk
20836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2084c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2085c609719bSwdenk
20866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2087c609719bSwdenk
2088c609719bSwdenk		Check for configuration errors during FPGA bitfile
2089c609719bSwdenk		loading. For example, abort during Virtex II
2090c609719bSwdenk		configuration if the INIT_B line goes low (which
2091c609719bSwdenk		indicated a CRC error).
2092c609719bSwdenk
20936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2094c609719bSwdenk
2095c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2096c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2097c609719bSwdenk		FPGA configuration sequence. The default time is 500
209811ccc33fSMarcel Ziswiler		ms.
2099c609719bSwdenk
21006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2101c609719bSwdenk
2102c609719bSwdenk		Maximum time to wait for BUSY to deassert during
210311ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2104c609719bSwdenk
21056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2106c609719bSwdenk
2107c609719bSwdenk		Time to wait after FPGA configuration. The default is
210811ccc33fSMarcel Ziswiler		200 ms.
2109c609719bSwdenk
2110c609719bSwdenk- Configuration Management:
2111c609719bSwdenk		CONFIG_IDENT_STRING
2112c609719bSwdenk
2113c609719bSwdenk		If defined, this string will be added to the U-Boot
2114c609719bSwdenk		version information (U_BOOT_VERSION)
2115c609719bSwdenk
2116c609719bSwdenk- Vendor Parameter Protection:
2117c609719bSwdenk
2118c609719bSwdenk		U-Boot considers the values of the environment
2119c609719bSwdenk		variables "serial#" (Board Serial Number) and
21207152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2121c609719bSwdenk		are set once by the board vendor / manufacturer, and
2122c609719bSwdenk		protects these variables from casual modification by
2123c609719bSwdenk		the user. Once set, these variables are read-only,
2124c609719bSwdenk		and write or delete attempts are rejected. You can
212511ccc33fSMarcel Ziswiler		change this behaviour:
2126c609719bSwdenk
2127c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2128c609719bSwdenk		file, the write protection for vendor parameters is
212947cd00faSwdenk		completely disabled. Anybody can change or delete
2130c609719bSwdenk		these parameters.
2131c609719bSwdenk
2132c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2133c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
213411ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2135c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2136c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2137c609719bSwdenk		read-only.]
2138c609719bSwdenk
2139c609719bSwdenk- Protected RAM:
2140c609719bSwdenk		CONFIG_PRAM
2141c609719bSwdenk
2142c609719bSwdenk		Define this variable to enable the reservation of
2143c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2144c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2145c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2146c609719bSwdenk		this default value by defining an environment
2147c609719bSwdenk		variable "pram" to the number of kB you want to
2148c609719bSwdenk		reserve. Note that the board info structure will
2149c609719bSwdenk		still show the full amount of RAM. If pRAM is
2150c609719bSwdenk		reserved, a new environment variable "mem" will
2151c609719bSwdenk		automatically be defined to hold the amount of
2152c609719bSwdenk		remaining RAM in a form that can be passed as boot
2153c609719bSwdenk		argument to Linux, for instance like that:
2154c609719bSwdenk
2155fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2156c609719bSwdenk			saveenv
2157c609719bSwdenk
2158c609719bSwdenk		This way you can tell Linux not to use this memory,
2159c609719bSwdenk		either, which results in a memory region that will
2160c609719bSwdenk		not be affected by reboots.
2161c609719bSwdenk
2162c609719bSwdenk		*WARNING* If your board configuration uses automatic
2163c609719bSwdenk		detection of the RAM size, you must make sure that
2164c609719bSwdenk		this memory test is non-destructive. So far, the
2165c609719bSwdenk		following board configurations are known to be
2166c609719bSwdenk		"pRAM-clean":
2167c609719bSwdenk
2168c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
2169c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
2170544d97e9SWolfgang Denk			FLAGADM, TQM8260
2171c609719bSwdenk
2172c609719bSwdenk- Error Recovery:
2173c609719bSwdenk		CONFIG_PANIC_HANG
2174c609719bSwdenk
2175c609719bSwdenk		Define this variable to stop the system in case of a
2176c609719bSwdenk		fatal error, so that you have to reset it manually.
2177c609719bSwdenk		This is probably NOT a good idea for an embedded
217811ccc33fSMarcel Ziswiler		system where you want the system to reboot
2179c609719bSwdenk		automatically as fast as possible, but it may be
2180c609719bSwdenk		useful during development since you can try to debug
2181c609719bSwdenk		the conditions that lead to the situation.
2182c609719bSwdenk
2183c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2184c609719bSwdenk
2185c609719bSwdenk		This variable defines the number of retries for
2186c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2187c609719bSwdenk		before giving up the operation. If not defined, a
2188c609719bSwdenk		default value of 5 is used.
2189c609719bSwdenk
219040cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
219140cb90eeSGuennadi Liakhovetski
219240cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
219340cb90eeSGuennadi Liakhovetski
219448a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
219548a3e999STetsuyuki Kobayashi
219648a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
219748a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
219848a3e999STetsuyuki Kobayashi		try longer timeout such as
219948a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
220048a3e999STetsuyuki Kobayashi
2201c609719bSwdenk- Command Interpreter:
22028078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
220304a85b3bSwdenk
220404a85b3bSwdenk		Enable auto completion of commands using TAB.
220504a85b3bSwdenk
22068078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
22078078f1a5SWolfgang Denk		for the "hush" shell.
22088078f1a5SWolfgang Denk
22098078f1a5SWolfgang Denk
22106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2211c609719bSwdenk
2212c609719bSwdenk		Define this variable to enable the "hush" shell (from
2213c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2214c609719bSwdenk		powerful command line syntax like
2215c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2216c609719bSwdenk		constructs ("shell scripts").
2217c609719bSwdenk
2218c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2219c609719bSwdenk		with a somewhat smaller memory footprint.
2220c609719bSwdenk
2221c609719bSwdenk
22226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2223c609719bSwdenk
2224c609719bSwdenk		This defines the secondary prompt string, which is
2225c609719bSwdenk		printed when the command interpreter needs more input
2226c609719bSwdenk		to complete a command. Usually "> ".
2227c609719bSwdenk
2228c609719bSwdenk	Note:
2229c609719bSwdenk
2230c609719bSwdenk		In the current implementation, the local variables
2231c609719bSwdenk		space and global environment variables space are
2232c609719bSwdenk		separated. Local variables are those you define by
22333b57fe0aSwdenk		simply typing `name=value'. To access a local
2234c609719bSwdenk		variable later on, you have write `$name' or
22353b57fe0aSwdenk		`${name}'; to execute the contents of a variable
22363b57fe0aSwdenk		directly type `$name' at the command prompt.
2237c609719bSwdenk
2238c609719bSwdenk		Global environment variables are those you use
2239c609719bSwdenk		setenv/printenv to work with. To run a command stored
2240c609719bSwdenk		in such a variable, you need to use the run command,
2241c609719bSwdenk		and you must not use the '$' sign to access them.
2242c609719bSwdenk
2243c609719bSwdenk		To store commands and special characters in a
2244c609719bSwdenk		variable, please use double quotation marks
2245c609719bSwdenk		surrounding the whole text of the variable, instead
2246c609719bSwdenk		of the backslashes before semicolons and special
2247c609719bSwdenk		symbols.
2248c609719bSwdenk
2249aa0c71acSWolfgang Denk- Commandline Editing and History:
2250aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2251aa0c71acSWolfgang Denk
225211ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2253aa0c71acSWolfgang Denk		commandline input operations
2254aa0c71acSWolfgang Denk
2255a8c7c708Swdenk- Default Environment:
2256c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2257c609719bSwdenk
2258c609719bSwdenk		Define this to contain any number of null terminated
2259c609719bSwdenk		strings (variable = value pairs) that will be part of
22607152b1d0Swdenk		the default environment compiled into the boot image.
22612262cfeeSwdenk
2262c609719bSwdenk		For example, place something like this in your
2263c609719bSwdenk		board's config file:
2264c609719bSwdenk
2265c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2266c609719bSwdenk			"myvar1=value1\0" \
2267c609719bSwdenk			"myvar2=value2\0"
2268c609719bSwdenk
2269c609719bSwdenk		Warning: This method is based on knowledge about the
2270c609719bSwdenk		internal format how the environment is stored by the
22712262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2272c609719bSwdenk		interface! Although it is unlikely that this format
22737152b1d0Swdenk		will change soon, there is no guarantee either.
2274c609719bSwdenk		You better know what you are doing here.
2275c609719bSwdenk
2276c609719bSwdenk		Note: overly (ab)use of the default environment is
2277c609719bSwdenk		discouraged. Make sure to check other ways to preset
227874de7aefSWolfgang Denk		the environment like the "source" command or the
2279c609719bSwdenk		boot command first.
2280c609719bSwdenk
22815e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
22825e724ca2SStephen Warren
22835e724ca2SStephen Warren		Define this in order to add variables describing the
22845e724ca2SStephen Warren		U-Boot build configuration to the default environment.
22855e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
22865e724ca2SStephen Warren
22875e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
22885e724ca2SStephen Warren
22895e724ca2SStephen Warren		- CONFIG_SYS_ARCH
22905e724ca2SStephen Warren		- CONFIG_SYS_CPU
22915e724ca2SStephen Warren		- CONFIG_SYS_BOARD
22925e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
22935e724ca2SStephen Warren		- CONFIG_SYS_SOC
22945e724ca2SStephen Warren
2295a8c7c708Swdenk- DataFlash Support:
22962abbe075Swdenk		CONFIG_HAS_DATAFLASH
22972abbe075Swdenk
22982abbe075Swdenk		Defining this option enables DataFlash features and
22992abbe075Swdenk		allows to read/write in Dataflash via the standard
23002abbe075Swdenk		commands cp, md...
23012abbe075Swdenk
2302f61ec45eSEric Nelson- Serial Flash support
2303f61ec45eSEric Nelson		CONFIG_CMD_SF
2304f61ec45eSEric Nelson
2305f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2306f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2307f61ec45eSEric Nelson
2308f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2309f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2310f61ec45eSEric Nelson		commands.
2311f61ec45eSEric Nelson
2312f61ec45eSEric Nelson		The following defaults may be provided by the platform
2313f61ec45eSEric Nelson		to handle the common case when only a single serial
2314f61ec45eSEric Nelson		flash is present on the system.
2315f61ec45eSEric Nelson
2316f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2317f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2318f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2319f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2320f61ec45eSEric Nelson
23213f85ce27Swdenk- SystemACE Support:
23223f85ce27Swdenk		CONFIG_SYSTEMACE
23233f85ce27Swdenk
23243f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
23253f85ce27Swdenk		chips attached via some sort of local bus. The address
232611ccc33fSMarcel Ziswiler		of the chip must also be defined in the
23276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
23283f85ce27Swdenk
23293f85ce27Swdenk		#define CONFIG_SYSTEMACE
23306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
23313f85ce27Swdenk
23323f85ce27Swdenk		When SystemACE support is added, the "ace" device type
23333f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
23343f85ce27Swdenk
2335ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2336ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2337ecb0ccd9SWolfgang Denk
233828cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2339ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
234028cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2341ecb0ccd9SWolfgang Denk		number generator is used.
2342ecb0ccd9SWolfgang Denk
234328cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
234428cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
234528cb9375SWolfgang Denk		defined, the normal port 69 is used.
234628cb9375SWolfgang Denk
234728cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2348ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2349ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2350ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2351ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2352ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2353ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2354ecb0ccd9SWolfgang Denk
2355a8c7c708Swdenk- Show boot progress:
2356c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2357c609719bSwdenk
2358c609719bSwdenk		Defining this option allows to add some board-
2359c609719bSwdenk		specific code (calling a user-provided function
2360c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2361c609719bSwdenk		the system's boot progress on some display (for
2362c609719bSwdenk		example, some LED's) on your board. At the moment,
2363c609719bSwdenk		the following checkpoints are implemented:
2364c609719bSwdenk
23653a608ca0SSimon Glass- Detailed boot stage timing
23663a608ca0SSimon Glass		CONFIG_BOOTSTAGE
23673a608ca0SSimon Glass		Define this option to get detailed timing of each stage
23683a608ca0SSimon Glass		of the boot process.
23693a608ca0SSimon Glass
23703a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
23713a608ca0SSimon Glass		This is the number of available user bootstage records.
23723a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
23733a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
23743a608ca0SSimon Glass		the limit, recording will stop.
23753a608ca0SSimon Glass
23763a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
23773a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
23783a608ca0SSimon Glass
23793a608ca0SSimon Glass		Timer summary in microseconds:
23803a608ca0SSimon Glass		       Mark    Elapsed  Stage
23813a608ca0SSimon Glass			  0          0  reset
23823a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
23833a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
23843a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
23853a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
23863a608ca0SSimon Glass		  3,910,375    250,777  main_loop
23873a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
23883a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
23893a608ca0SSimon Glass
23901372cce2SMarian BalakowiczLegacy uImage format:
23911372cce2SMarian Balakowicz
2392c609719bSwdenk  Arg	Where			When
2393c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2394c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2395c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2396c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2397c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2398c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2399c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2400c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2401c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
24021372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2403c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2404c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2405c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2406c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
24071372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2408c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
24091372cce2SMarian Balakowicz
24101372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
24111372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
24121372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
24131372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
24141372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
24151372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
24161372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
241711ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
24181372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
24191372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
24201372cce2SMarian Balakowicz
2421ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2422c609719bSwdenk
2423a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
242463e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
242563e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
242663e73c9aSwdenk
2427566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2428566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2429566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2430566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2431566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2432566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2433566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2434566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2435566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2436566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2437566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2438566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2439566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2440566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2441566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2442566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2443566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2444566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2445566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2446566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2447566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2448566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2449566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2450566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2451566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2452566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2453566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2454566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2455566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2456566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2457566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2458566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2459566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2460566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2461566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2462566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2463566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2464566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2465566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2466566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2467566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2468566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2469566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2470566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2471566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2472566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2473566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2474c609719bSwdenk
2475566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2476c609719bSwdenk
2477566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2478566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2479566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2480206c60cbSwdenk
2481566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2482566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
248311ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2484566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2485566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2486566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
248774de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
248874de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2489566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2490c609719bSwdenk
24911372cce2SMarian BalakowiczFIT uImage format:
24921372cce2SMarian Balakowicz
24931372cce2SMarian Balakowicz  Arg	Where			When
24941372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
24951372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
24961372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
24971372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
24981372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
24991372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2500f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
25011372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
25021372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
25031372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
25041372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
25051372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
250611ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
250711ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
25081372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
25091372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
25101372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
25111372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
25121372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
25131372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
25141372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
25151372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
25161372cce2SMarian Balakowicz
25171372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
25181372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
25191372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
252011ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
25211372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
25221372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
25231372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
25241372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
25251372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
25261372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
25271372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
25281372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
25291372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
25301372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
25311372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
25321372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
25331372cce2SMarian Balakowicz
253411ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
25351372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
25361372cce2SMarian Balakowicz
253711ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
25381372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
25391372cce2SMarian Balakowicz
254011ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
25411372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
25421372cce2SMarian Balakowicz
25434cf2609bSWolfgang Denk- Standalone program support:
25444cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
25454cf2609bSWolfgang Denk
25466feff899SWolfgang Denk		This option defines a board specific value for the
25476feff899SWolfgang Denk		address where standalone program gets loaded, thus
25486feff899SWolfgang Denk		overwriting the architecture dependent default
25494cf2609bSWolfgang Denk		settings.
25504cf2609bSWolfgang Denk
25514cf2609bSWolfgang Denk- Frame Buffer Address:
25524cf2609bSWolfgang Denk		CONFIG_FB_ADDR
25534cf2609bSWolfgang Denk
25544cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
25554cf2609bSWolfgang Denk		address for frame buffer.
25564cf2609bSWolfgang Denk		Then system will reserve the frame buffer address to
25574cf2609bSWolfgang Denk		defined address instead of lcd_setmem (this function
25586feff899SWolfgang Denk		grabs the memory for frame buffer by panel's size).
25594cf2609bSWolfgang Denk
25604cf2609bSWolfgang Denk		Please see board_init_f function.
25614cf2609bSWolfgang Denk
2562cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2563cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2564cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2565cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2566cccfc2abSDetlev Zundel
2567cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2568cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2569cccfc2abSDetlev Zundel
2570cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2571cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2572cccfc2abSDetlev Zundel
2573cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2574cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2575cccfc2abSDetlev Zundel
2576cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2577cccfc2abSDetlev Zundel
2578cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2579cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2580cccfc2abSDetlev Zundel
25816a11cf48SDaniel Schwierzeck- SPL framework
25826a11cf48SDaniel Schwierzeck		CONFIG_SPL
25836a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
25846a11cf48SDaniel Schwierzeck
258595579793STom Rini		CONFIG_SPL_LDSCRIPT
258695579793STom Rini		LDSCRIPT for linking the SPL binary.
258795579793STom Rini
258895579793STom Rini		CONFIG_SPL_MAX_SIZE
258995579793STom Rini		Maximum binary size (text, data and rodata) of the SPL binary.
259095579793STom Rini
25916a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
25926a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
25936a11cf48SDaniel Schwierzeck
259495579793STom Rini		CONFIG_SPL_BSS_START_ADDR
259595579793STom Rini		Link address for the BSS within the SPL binary.
259695579793STom Rini
259795579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
259895579793STom Rini		Maximum binary size of the BSS section of the SPL binary.
259995579793STom Rini
260095579793STom Rini		CONFIG_SPL_STACK
260195579793STom Rini		Adress of the start of the stack SPL will use
260295579793STom Rini
260395579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
260495579793STom Rini		Starting address of the malloc pool used in SPL.
260595579793STom Rini
260695579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
260795579793STom Rini		The size of the malloc pool used in SPL.
26086a11cf48SDaniel Schwierzeck
260947f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
261047f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
261147f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
261247f7bcaeSTom Rini		NAND loading of the Linux Kernel.
261347f7bcaeSTom Rini
2614861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
2615861a86f4STom Rini		For ARM, enable an optional function to print more information
2616861a86f4STom Rini		about the running system.
2617861a86f4STom Rini
26186a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
26196a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
26206a11cf48SDaniel Schwierzeck
26216a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
26226a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
26236a11cf48SDaniel Schwierzeck
26246a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
26256a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
26266a11cf48SDaniel Schwierzeck
26276a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
26286a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
26296a11cf48SDaniel Schwierzeck
26306a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
26316a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
26326a11cf48SDaniel Schwierzeck
263395579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
263495579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
263595579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
263695579793STom Rini		Address, size and partition on the MMC to load U-Boot from
263795579793STom Rini		when the MMC is being used in raw mode.
263895579793STom Rini
263995579793STom Rini		CONFIG_SPL_FAT_SUPPORT
264095579793STom Rini		Support for fs/fat/libfat.o in SPL binary
264195579793STom Rini
264295579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
264395579793STom Rini		Filename to read to load U-Boot when reading from FAT
264495579793STom Rini
264595579793STom Rini		CONFIG_SPL_NAND_SIMPLE
264695579793STom Rini		Support for drivers/mtd/nand/libnand.o in SPL binary
264795579793STom Rini
264895579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
264995579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
265095579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
265195579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
265295579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
265395579793STom Rini		Defines the size and behavior of the NAND that SPL uses
265495579793STom Rini		to read U-Boot with CONFIG_SPL_NAND_SIMPLE
265595579793STom Rini
265695579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
265795579793STom Rini		Location in NAND for CONFIG_SPL_NAND_SIMPLE to read U-Boot
265895579793STom Rini		from.
265995579793STom Rini
266095579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
266195579793STom Rini		Location in memory for CONFIG_SPL_NAND_SIMPLE to load U-Boot
266295579793STom Rini		to.
266395579793STom Rini
266495579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
266595579793STom Rini		Define this if you need to first read the OOB and then the
266695579793STom Rini		data. This is used for example on davinci plattforms.
266795579793STom Rini
266895579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
266995579793STom Rini		Support for an OMAP3-specific set of functions to return the
267095579793STom Rini		ID and MFR of the first attached NAND chip, if present.
267195579793STom Rini
26726a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
26736a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
26746a11cf48SDaniel Schwierzeck
26756a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
26766a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
26776a11cf48SDaniel Schwierzeck
26786a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
26796a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
26806a11cf48SDaniel Schwierzeck
2681c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
2682c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
2683c57b953dSPavel Machek
26846a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
26856a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
26861372cce2SMarian Balakowicz
2687c609719bSwdenkModem Support:
2688c609719bSwdenk--------------
2689c609719bSwdenk
2690566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
2691c609719bSwdenk
269211ccc33fSMarcel Ziswiler- Modem support enable:
2693c609719bSwdenk		CONFIG_MODEM_SUPPORT
2694c609719bSwdenk
2695c609719bSwdenk- RTS/CTS Flow control enable:
2696c609719bSwdenk		CONFIG_HWFLOW
2697c609719bSwdenk
2698c609719bSwdenk- Modem debug support:
2699c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2700c609719bSwdenk
2701c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2702c609719bSwdenk		for modem support. Useful only with BDI2000.
2703c609719bSwdenk
2704a8c7c708Swdenk- Interrupt support (PPC):
2705a8c7c708Swdenk
2706a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2707a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
270811ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2709a8c7c708Swdenk		should set decrementer_count to appropriate value. If
271011ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2711a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
271211ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2713a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2714a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2715a8c7c708Swdenk		general timer_interrupt().
2716a8c7c708Swdenk
2717c609719bSwdenk- General:
2718c609719bSwdenk
2719c609719bSwdenk		In the target system modem support is enabled when a
2720c609719bSwdenk		specific key (key combination) is pressed during
2721c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
272211ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2723c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2724c609719bSwdenk		function, returning 1 and thus enabling modem
2725c609719bSwdenk		initialization.
2726c609719bSwdenk
2727c609719bSwdenk		If there are no modem init strings in the
2728c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2729c609719bSwdenk		previous output (banner, info printfs) will be
273011ccc33fSMarcel Ziswiler		suppressed, though.
2731c609719bSwdenk
2732c609719bSwdenk		See also: doc/README.Modem
2733c609719bSwdenk
27349660e442SHelmut RaigerBoard initialization settings:
27359660e442SHelmut Raiger------------------------------
27369660e442SHelmut Raiger
27379660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
27389660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
27399660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
27409660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
27419660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
27429660e442SHelmut Raigertypically in board_init_f() and board_init_r().
27439660e442SHelmut Raiger
27449660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
27459660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
27469660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
27479660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
2748c609719bSwdenk
2749c609719bSwdenkConfiguration Settings:
2750c609719bSwdenk-----------------------
2751c609719bSwdenk
27526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2753c609719bSwdenk		undefine this when you're short of memory.
2754c609719bSwdenk
27552fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
27562fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
27572fb2604dSPeter Tyser
27586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2759c609719bSwdenk		prompt for user input.
2760c609719bSwdenk
27616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2762c609719bSwdenk
27636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2764c609719bSwdenk
27656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2766c609719bSwdenk
27676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2768c609719bSwdenk		the application (usually a Linux kernel) when it is
2769c609719bSwdenk		booted
2770c609719bSwdenk
27716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2772c609719bSwdenk		List of legal baudrate settings for this board.
2773c609719bSwdenk
27746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2775c609719bSwdenk		Suppress display of console information at boot.
2776c609719bSwdenk
27776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2778c609719bSwdenk		If the board specific function
2779c609719bSwdenk			extern int overwrite_console (void);
2780c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2781c609719bSwdenk		serial port, else the settings in the environment are used.
2782c609719bSwdenk
27836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2784c609719bSwdenk		Enable the call to overwrite_console().
2785c609719bSwdenk
27866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2787c609719bSwdenk		Enable overwrite of previous console environment settings.
2788c609719bSwdenk
27896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2790c609719bSwdenk		Begin and End addresses of the area used by the
2791c609719bSwdenk		simple memory test.
2792c609719bSwdenk
27936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2794c609719bSwdenk		Enable an alternate, more extensive memory test.
2795c609719bSwdenk
27966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
27975f535fe1Swdenk		Scratch address used by the alternate memory test
27985f535fe1Swdenk		You only need to set this if address zero isn't writeable
27995f535fe1Swdenk
28006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
28016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
280214f73ca6SStefan Roese		this specified memory area will get subtracted from the top
280311ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
280414f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
280514f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
280614f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
28075e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
280814f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
28095e12e75dSStefan Roese		will have to get fixed in Linux additionally.
281014f73ca6SStefan Roese
281114f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
281214f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
281314f73ca6SStefan Roese		be touched.
281414f73ca6SStefan Roese
281514f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
281614f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
281714f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
281814f73ca6SStefan Roese		non page size aligned address and this could cause major
281914f73ca6SStefan Roese		problems.
282014f73ca6SStefan Roese
28216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2822c609719bSwdenk		Default load address for network file downloads
2823c609719bSwdenk
28246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2825c609719bSwdenk		Enable temporary baudrate change while serial download
2826c609719bSwdenk
28276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2828c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2829c609719bSwdenk
28306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2831c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2832c609719bSwdenk		Cogent motherboard)
2833c609719bSwdenk
28346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2835c609719bSwdenk		Physical start address of Flash memory.
2836c609719bSwdenk
28376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2838c609719bSwdenk		Physical start address of boot monitor code (set by
2839c609719bSwdenk		make config files to be same as the text base address
284014d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
28416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2842c609719bSwdenk
28436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
28443b57fe0aSwdenk		Size of memory reserved for monitor code, used to
28453b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
28463b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
28473b57fe0aSwdenk		flash sector.
2848c609719bSwdenk
28496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2850c609719bSwdenk		Size of DRAM reserved for malloc() use.
2851c609719bSwdenk
28526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
285315940c9aSStefan Roese		Normally compressed uImages are limited to an
285415940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
28556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
285615940c9aSStefan Roese		to adjust this setting to your needs.
2857c609719bSwdenk
28586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2859c609719bSwdenk		Maximum size of memory mapped by the startup code of
2860c609719bSwdenk		the Linux kernel; all data that must be processed by
28617d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
28627d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
28637d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
28647d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
2865c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
2866c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
2867c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
2868c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
2869c609719bSwdenk
2870fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2871fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2872fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2873fca43cc8SJohn Rigby		is enabled.
2874fca43cc8SJohn Rigby
2875fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
2876fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
2877fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
2878fca43cc8SJohn Rigby
2879fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
2880fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
2881fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2882fca43cc8SJohn Rigby
28836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
2884c609719bSwdenk		Max number of Flash memory banks
2885c609719bSwdenk
28866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
2887c609719bSwdenk		Max number of sectors on a Flash chip
2888c609719bSwdenk
28896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
2890c609719bSwdenk		Timeout for Flash erase operations (in ms)
2891c609719bSwdenk
28926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
2893c609719bSwdenk		Timeout for Flash write operations (in ms)
2894c609719bSwdenk
28956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
28968564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
28978564acf9Swdenk
28986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
28998564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
29008564acf9Swdenk
29016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
29028564acf9Swdenk		If defined, hardware flash sectors protection is used
29038564acf9Swdenk		instead of U-Boot software protection.
29048564acf9Swdenk
29056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
2906c609719bSwdenk
2907c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2908c609719bSwdenk		without this option such a download has to be
2909c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2910c609719bSwdenk		copy from RAM to flash.
2911c609719bSwdenk
2912c609719bSwdenk		The two-step approach is usually more reliable, since
2913c609719bSwdenk		you can check if the download worked before you erase
291411ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
291511ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2916c609719bSwdenk		downloaded image) this option may be very useful.
2917c609719bSwdenk
29186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
2919c609719bSwdenk		Define if the flash driver uses extra elements in the
29205653fc33Swdenk		common flash structure for storing flash geometry.
29215653fc33Swdenk
292200b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
29235653fc33Swdenk		This option also enables the building of the cfi_flash driver
29245653fc33Swdenk		in the drivers directory
292553cf9435Sstroese
292691809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
292791809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
292891809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
292991809ed5SPiotr Ziecik		to the MTD layer.
293091809ed5SPiotr Ziecik
29316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
293296ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
293396ef831fSGuennadi Liakhovetski
293496ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
293596ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
293696ef831fSGuennadi Liakhovetski		write commands.
293796ef831fSGuennadi Liakhovetski
29386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
29395568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
29405568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
29415568e613SStefan Roese		is useful, if some of the configured banks are only
29425568e613SStefan Roese		optionally available.
29435568e613SStefan Roese
29449a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
29459a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
29469a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
29479a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
29489a042e9cSJerry Van Baren
29496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
295011ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
295111ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
295253cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
295353cf9435Sstroese		buffers can be full shortly after enabling the interface
295411ccc33fSMarcel Ziswiler		on high Ethernet traffic.
295553cf9435Sstroese		Defaults to 4 if not defined.
2956c609719bSwdenk
2957ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
2958ea882bafSWolfgang Denk
2959ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
2960ea882bafSWolfgang Denk	internally to store the environment settings. The default
2961ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
2962ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
2963ea882bafSWolfgang Denk	lib/hashtable.c for details.
2964ea882bafSWolfgang Denk
2965c609719bSwdenkThe following definitions that deal with the placement and management
2966c609719bSwdenkof environment data (variable area); in general, we support the
2967c609719bSwdenkfollowing configurations:
2968c609719bSwdenk
2969c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
2970c3eb3fe4SMike Frysinger
2971c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
2972c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
2973c3eb3fe4SMike Frysinger
29745a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2975c609719bSwdenk
2976c609719bSwdenk	Define this if the environment is in flash memory.
2977c609719bSwdenk
2978c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2979c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2980c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2981c609719bSwdenk	   sector" type flash chips, which have several smaller
2982c609719bSwdenk	   sectors at the start or the end. For instance, such a
2983c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2984c609719bSwdenk	   such a case you would place the environment in one of the
2985c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2986c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2987c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2988c609719bSwdenk	   between U-Boot and the environment.
2989c609719bSwdenk
29900e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2991c609719bSwdenk
2992c609719bSwdenk	   Offset of environment data (variable area) to the
2993c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2994c609719bSwdenk	   type flash chips the second sector can be used: the offset
2995c609719bSwdenk	   for this sector is given here.
2996c609719bSwdenk
29976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2998c609719bSwdenk
29990e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3000c609719bSwdenk
3001c609719bSwdenk	   This is just another way to specify the start address of
3002c609719bSwdenk	   the flash sector containing the environment (instead of
30030e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3004c609719bSwdenk
30050e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3006c609719bSwdenk
3007c609719bSwdenk	   Size of the sector containing the environment.
3008c609719bSwdenk
3009c609719bSwdenk
3010c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3011c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3012c609719bSwdenk	   the environment.
3013c609719bSwdenk
30140e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3015c609719bSwdenk
30165a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
30170e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3018c609719bSwdenk	   of this flash sector for the environment. This saves
3019c609719bSwdenk	   memory for the RAM copy of the environment.
3020c609719bSwdenk
3021c609719bSwdenk	   It may also save flash memory if you decide to use this
3022c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3023c609719bSwdenk	   since then the remainder of the flash sector could be used
3024c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3025c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3026c609719bSwdenk	   updating the environment in flash makes it always
3027c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3028c609719bSwdenk	   wrong before the contents has been restored from a copy in
3029c609719bSwdenk	   RAM, your target system will be dead.
3030c609719bSwdenk
30310e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
30320e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3033c609719bSwdenk
3034c609719bSwdenk	   These settings describe a second storage area used to hold
303511ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
30363e38691eSwdenk	   a valid backup copy in case there is a power failure during
3037c609719bSwdenk	   a "saveenv" operation.
3038c609719bSwdenk
3039c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3040c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3041c609719bSwdenkaccordingly!
3042c609719bSwdenk
3043c609719bSwdenk
30449314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3045c609719bSwdenk
3046c609719bSwdenk	Define this if you have some non-volatile memory device
3047c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3048c609719bSwdenk	environment.
3049c609719bSwdenk
30500e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
30510e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3052c609719bSwdenk
305311ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3054c609719bSwdenk	  want to use for environment. It is assumed that this memory
3055c609719bSwdenk	  can just be read and written to, without any special
3056c609719bSwdenk	  provision.
3057c609719bSwdenk
3058c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3059c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
306011ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3061c609719bSwdenkU-Boot will hang.
3062c609719bSwdenk
3063c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3064c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3065c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3066c609719bSwdenkto save the current settings.
3067c609719bSwdenk
3068c609719bSwdenk
3069bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3070c609719bSwdenk
3071c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3072c609719bSwdenk	device and a driver for it.
3073c609719bSwdenk
30740e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
30750e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3076c609719bSwdenk
3077c609719bSwdenk	  These two #defines specify the offset and size of the
3078c609719bSwdenk	  environment area within the total memory of your EEPROM.
3079c609719bSwdenk
30806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3081c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3082c609719bSwdenk	  The default address is zero.
3083c609719bSwdenk
30846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3085c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3086c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3087c609719bSwdenk	  would require six bits.
3088c609719bSwdenk
30896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3090c609719bSwdenk	  If defined, the number of milliseconds to delay between
3091c609719bSwdenk	  page writes.	The default is zero milliseconds.
3092c609719bSwdenk
30936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3094c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3095c609719bSwdenk	  that this is NOT the chip address length!
3096c609719bSwdenk
30976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
30985cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
30995cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
31005cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
31015cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
31025cf91d6bSwdenk	  byte chips.
31035cf91d6bSwdenk
31045cf91d6bSwdenk	  Note that we consider the length of the address field to
31055cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
31065cf91d6bSwdenk	  in the chip address.
31075cf91d6bSwdenk
31086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3109c609719bSwdenk	  The size in bytes of the EEPROM device.
3110c609719bSwdenk
3111548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3112548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3113548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3114548738b4SHeiko Schocher
3115548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3116548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3117548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3118548738b4SHeiko Schocher	  EEPROM. For example:
3119548738b4SHeiko Schocher
3120548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
3121548738b4SHeiko Schocher
3122548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3123548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3124c609719bSwdenk
3125057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
31265779d8d9Swdenk
31275779d8d9Swdenk	Define this if you have a DataFlash memory device which you
31285779d8d9Swdenk	want to use for the environment.
31295779d8d9Swdenk
31300e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
31310e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
31320e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
31335779d8d9Swdenk
31345779d8d9Swdenk	  These three #defines specify the offset and size of the
31355779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
31365779d8d9Swdenk	  at the specified address.
31375779d8d9Swdenk
31380a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
31390a85a9e7SLiu Gang
31400a85a9e7SLiu Gang	Define this if you have a remote memory space which you
31410a85a9e7SLiu Gang	want to use for the local device's environment.
31420a85a9e7SLiu Gang
31430a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
31440a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
31450a85a9e7SLiu Gang
31460a85a9e7SLiu Gang	  These two #defines specify the address and size of the
31470a85a9e7SLiu Gang	  environment area within the remote memory space. The
31480a85a9e7SLiu Gang	  local device can get the environment from remote memory
3149fc54c7faSLiu Gang	  space by SRIO or PCIE links.
31500a85a9e7SLiu Gang
31510a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
31520a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3153fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3154fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
31550a85a9e7SLiu Gang
315651bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
315713a5695bSwdenk
315813a5695bSwdenk	Define this if you have a NAND device which you want to use
315913a5695bSwdenk	for the environment.
316013a5695bSwdenk
31610e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
31620e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
316313a5695bSwdenk
316413a5695bSwdenk	  These two #defines specify the offset and size of the environment
3165fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3166fdd813deSScott Wood	  aligned to an erase block boundary.
31675779d8d9Swdenk
3168fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3169e443c944SMarkus Klotzbuecher
31700e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3171fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3172fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3173fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3174fdd813deSScott Wood	  aligned to an erase block boundary.
3175e443c944SMarkus Klotzbuecher
3176fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3177fdd813deSScott Wood
3178fdd813deSScott Wood	  Specifies the length of the region in which the environment
3179fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3180fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3181fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3182fdd813deSScott Wood	  the range to be avoided.
3183fdd813deSScott Wood
3184fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3185fdd813deSScott Wood
3186fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3187fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3188fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3189fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3190fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3191e443c944SMarkus Klotzbuecher
3192b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3193b74ab737SGuennadi Liakhovetski
3194b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3195b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3196b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3197b74ab737SGuennadi Liakhovetski
31986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3199c609719bSwdenk
3200c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3201c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3202c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3203c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3204c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3205c609719bSwdenk	to be a good choice since it makes it far enough from the
3206c609719bSwdenk	start of the data area as well as from the stack pointer.
3207c609719bSwdenk
3208e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3209c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3210cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3211c609719bSwdenkuntil then to read environment variables.
3212c609719bSwdenk
321385ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
321485ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
321585ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
321685ec0bccSwdenknecessary, because the first environment variable we need is the
321785ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
321885ec0bccSwdenkhave any device yet where we could complain.]
3219c609719bSwdenk
3220c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3221c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
322285ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3223c609719bSwdenk
32246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3225fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3226fc3e2165Swdenk
32276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3228fc3e2165Swdenk		      also needs to be defined.
3229fc3e2165Swdenk
32306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3231fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3232c609719bSwdenk
3233f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3234f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3235f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3236f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3237f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3238f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3239f5675aa5SRon Madrid
3240c609719bSwdenkLow Level (hardware related) configuration options:
3241dc7c9a1aSwdenk---------------------------------------------------
3242c609719bSwdenk
32436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3244c609719bSwdenk		Cache Line Size of the CPU.
3245c609719bSwdenk
32466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3247c609719bSwdenk		Default address of the IMMR after system reset.
32482535d602Swdenk
32492535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
32502535d602Swdenk		and RPXsuper) to be able to adjust the position of
32512535d602Swdenk		the IMMR register after a reset.
3252c609719bSwdenk
3253e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3254e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3255e46fedfeSTimur Tabi		PowerPC SOCs.
3256e46fedfeSTimur Tabi
3257e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3258e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3259e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3260e46fedfeSTimur Tabi
3261e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3262e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3263e46fedfeSTimur Tabi
3264e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3265e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3266e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3267e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3268e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3269e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3270e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3271e46fedfeSTimur Tabi
3272e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3273e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3274e46fedfeSTimur Tabi
3275e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3276e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3277e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3278e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3279e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3280e46fedfeSTimur Tabi
3281e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3282e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3283e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3284e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3285e46fedfeSTimur Tabi
3286e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3287e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3288e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3289e46fedfeSTimur Tabi
32907f6c2cbcSwdenk- Floppy Disk Support:
32916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
32927f6c2cbcSwdenk
32937f6c2cbcSwdenk		the default drive number (default value 0)
32947f6c2cbcSwdenk
32956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
32967f6c2cbcSwdenk
329711ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
32987f6c2cbcSwdenk		(default value 1)
32997f6c2cbcSwdenk
33006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
33017f6c2cbcSwdenk
33027f6c2cbcSwdenk		defines the offset of register from address. It
33037f6c2cbcSwdenk		depends on which part of the data bus is connected to
330411ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
33057f6c2cbcSwdenk
33066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
33076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
33087f6c2cbcSwdenk		default value.
33097f6c2cbcSwdenk
33106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
33117f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
33127f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
33137f6c2cbcSwdenk		source code. It is used to make hardware dependant
33147f6c2cbcSwdenk		initializations.
33157f6c2cbcSwdenk
33160abddf82SMacpaul Lin- CONFIG_IDE_AHB:
33170abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
33180abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
33190abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
33200abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
33210abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
33220abddf82SMacpaul Lin		is requierd.
33230abddf82SMacpaul Lin
33246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
332525d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
332625d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3327c609719bSwdenk
33286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3329c609719bSwdenk
33307152b1d0Swdenk		Start address of memory area that can be used for
3331c609719bSwdenk		initial data and stack; please note that this must be
3332c609719bSwdenk		writable memory that is working WITHOUT special
3333c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3334c609719bSwdenk		will become available only after programming the
3335c609719bSwdenk		memory controller and running certain initialization
3336c609719bSwdenk		sequences.
3337c609719bSwdenk
3338c609719bSwdenk		U-Boot uses the following memory types:
3339c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3340c609719bSwdenk		- MPC824X: data cache
3341c609719bSwdenk		- PPC4xx:  data cache
3342c609719bSwdenk
33436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3344c609719bSwdenk
3345c609719bSwdenk		Offset of the initial data structure in the memory
33466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
33476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3348c609719bSwdenk		data is located at the end of the available space
3349553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
33506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
33516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
33526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3353c609719bSwdenk
3354c609719bSwdenk	Note:
3355c609719bSwdenk		On the MPC824X (or other systems that use the data
3356c609719bSwdenk		cache for initial memory) the address chosen for
33576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3358c609719bSwdenk		point to an otherwise UNUSED address space between
3359c609719bSwdenk		the top of RAM and the start of the PCI space.
3360c609719bSwdenk
33616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3362c609719bSwdenk
33636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3364c609719bSwdenk
33656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3366c609719bSwdenk
33676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3368c609719bSwdenk
33696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3370c609719bSwdenk
33716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3372c609719bSwdenk
33736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3374c609719bSwdenk		SDRAM timing
3375c609719bSwdenk
33766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3377c609719bSwdenk		periodic timer for refresh
3378c609719bSwdenk
33796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3380c609719bSwdenk
33816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
33826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
33836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
33846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3385c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3386c609719bSwdenk
3387c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
33886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
33896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3390c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3391c609719bSwdenk
33926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
33936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3394c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3395c609719bSwdenk		Prescaler definitions (SDRAM timing)
3396c609719bSwdenk
33976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3398c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3399c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3400c609719bSwdenk
34016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3402b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3403b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3404b423d055SHeiko Schocher
34056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3406c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3407c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3408c609719bSwdenk
34096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3410c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3411c609719bSwdenk		wrong setting might damage your board. Read
3412c609719bSwdenk		doc/README.MBX before setting this variable!
3413c609719bSwdenk
34146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3415ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3416ea909b76Swdenk		(Power On Self Tests). This definition overrides
3417ea909b76Swdenk		#define'd default value in commproc.h resp.
3418ea909b76Swdenk		cpm_8260.h.
3419ea909b76Swdenk
34206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
34216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
34226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
34236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
34246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
34256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
34266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
34276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3428a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
34295d232d0eSwdenk
34309cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
34319cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
34329cacf4fcSDirk Eibach		required.
34339cacf4fcSDirk Eibach
343469fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
343569fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
343669fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
343769fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
343869fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
343969fd2d3bSAndrew Sharp		by coreboot or similar.
344069fd2d3bSAndrew Sharp
3441a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
3442a09b9b68SKumar Gala		Chip has SRIO or not
3443a09b9b68SKumar Gala
3444a09b9b68SKumar Gala- CONFIG_SRIO1:
3445a09b9b68SKumar Gala		Board has SRIO 1 port available
3446a09b9b68SKumar Gala
3447a09b9b68SKumar Gala- CONFIG_SRIO2:
3448a09b9b68SKumar Gala		Board has SRIO 2 port available
3449a09b9b68SKumar Gala
3450a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
3451a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
3452a09b9b68SKumar Gala
3453a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
3454a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
3455a09b9b68SKumar Gala
3456a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
3457a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
3458a09b9b68SKumar Gala
3459eced4626SAlex Waterman- CONFIG_SYS_NDFC_16
3460eced4626SAlex Waterman		Defined to tell the NDFC that the NAND chip is using a
3461eced4626SAlex Waterman		16 bit bus.
3462eced4626SAlex Waterman
3463eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
3464eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
3465eced4626SAlex Waterman		a default value will be used.
3466eced4626SAlex Waterman
3467bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
3468218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
3469218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
3470218ca724SWolfgang Denk
3471bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
3472bb99ad6dSBen Warren		I2C address of the SPD EEPROM
3473bb99ad6dSBen Warren
34746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
3475218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
3476218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
3477218ca724SWolfgang Denk		to something your driver can deal with.
3478bb99ad6dSBen Warren
34791b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
34801b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
34811b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
34821b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
34831b3e3c4fSYork Sun		header files or board specific files.
34841b3e3c4fSYork Sun
34856f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
34866f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
34876f5e1dc5SYork Sun
34886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
3489218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
3490218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
34912ad6b513STimur Tabi
3492c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
3493c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
3494c26e454dSwdenk
3495c26e454dSwdenk- CONFIG_FEC[12]_PHY
3496c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
34976e592385Swdenk		to the given FEC; i. e.
3498c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
3499c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
3500c26e454dSwdenk
3501c26e454dSwdenk		When set to -1, means to probe for first available.
3502c26e454dSwdenk
3503c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
3504c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
3505c26e454dSwdenk		(so program the FEC to ignore it).
3506c26e454dSwdenk
3507c26e454dSwdenk- CONFIG_RMII
3508c26e454dSwdenk		Enable RMII mode for all FECs.
3509c26e454dSwdenk		Note that this is a global option, we can't
3510c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
3511c26e454dSwdenk
35125cf91d6bSwdenk- CONFIG_CRC32_VERIFY
35135cf91d6bSwdenk		Add a verify option to the crc32 command.
35145cf91d6bSwdenk		The syntax is:
35155cf91d6bSwdenk
35165cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
35175cf91d6bSwdenk
35185cf91d6bSwdenk		Where address/count indicate a memory area
35195cf91d6bSwdenk		and crc32 is the correct crc32 which the
35205cf91d6bSwdenk		area should have.
35215cf91d6bSwdenk
352256523f12Swdenk- CONFIG_LOOPW
352356523f12Swdenk		Add the "loopw" memory command. This only takes effect if
3524602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
352556523f12Swdenk
35267b466641Sstroese- CONFIG_MX_CYCLIC
35277b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
35287b466641Sstroese		"md/mw" commands.
35297b466641Sstroese		Examples:
35307b466641Sstroese
35317b466641Sstroese		=> mdc.b 10 4 500
35327b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
35337b466641Sstroese
35347b466641Sstroese		=> mwc.l 100 12345678 10
35357b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
35367b466641Sstroese
35377b466641Sstroese		This only takes effect if the memory commands are activated
3538602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
35397b466641Sstroese
35408aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
3541afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
3542e03f3169SWolfgang Denk		low level initializations (like setting up the memory
3543e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
3544e03f3169SWolfgang Denk		relocate itself into RAM.
35458aa1a2d1Swdenk
3546e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
3547e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
3548e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
3549e03f3169SWolfgang Denk		these initializations itself.
35508aa1a2d1Swdenk
3551401bb30bSAneesh V- CONFIG_SPL_BUILD
3552df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
3553df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
3554df81238bSMagnus Lilja		compiling a NAND SPL.
3555400558b5Swdenk
3556d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3557d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3558d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3559d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3560d8834a13SMatthias Weisser		conditions but may increase the binary size.
3561d8834a13SMatthias Weisser
3562f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
3563f2717b47STimur Tabi-----------------------------------
3564f2717b47STimur Tabi
3565f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
3566f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
3567f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
3568f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
3569f2717b47STimur Tabiwithin that device.
3570f2717b47STimur Tabi
3571f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
3572f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
3573f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
3574f2717b47STimur Tabi	is also specified.
3575f2717b47STimur Tabi
3576f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
3577f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
3578f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
3579f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
3580f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
3581f2717b47STimur Tabi
3582f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
3583f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
3584f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
3585f2717b47STimur Tabi	virtual address in NOR flash.
3586f2717b47STimur Tabi
3587f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
3588f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
3589f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
3590f2717b47STimur Tabi
3591f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
3592f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
3593f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3594f2717b47STimur Tabi
3595f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
3596f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
3597f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3598f2717b47STimur Tabi
3599292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
3600292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
3601292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
3602fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
3603fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
3604fc54c7faSLiu Gang	master's memory space.
3605f2717b47STimur Tabi
3606c609719bSwdenkBuilding the Software:
3607c609719bSwdenk======================
3608c609719bSwdenk
3609218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
3610218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
3611218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
3612218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
3613218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3614218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
3615c609719bSwdenk
3616218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
3617218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
3618218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
3619218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
3620218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
3621c609719bSwdenk
3622218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
3623218ca724SWolfgang Denk	$ export CROSS_COMPILE
3624c609719bSwdenk
36252f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
36262f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
36272f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
36282f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
36292f8d396bSPeter Tyser
36302f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
36312f8d396bSPeter Tyser
36322f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
36332f8d396bSPeter Tyser      be executed on computers running Windows.
36342f8d396bSPeter Tyser
3635c609719bSwdenkU-Boot is intended to be simple to build. After installing the
3636c609719bSwdenksources you must configure U-Boot for one specific board type. This
3637c609719bSwdenkis done by typing:
3638c609719bSwdenk
3639c609719bSwdenk	make NAME_config
3640c609719bSwdenk
3641218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
36424d675ae6SMichael Jonesrations; see boards.cfg for supported names.
364354387ac9Swdenk
3644c609719bSwdenkNote: for some board special configuration names may exist; check if
3645c609719bSwdenk      additional information is available from the board vendor; for
36462729af9dSwdenk      instance, the TQM823L systems are available without (standard)
36472729af9dSwdenk      or with LCD support. You can select such additional "features"
364811ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
3649c609719bSwdenk
36502729af9dSwdenk      make TQM823L_config
36512729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
3652c609719bSwdenk
3653c609719bSwdenk      make TQM823L_LCD_config
3654c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
3655c609719bSwdenk
3656c609719bSwdenk      etc.
3657c609719bSwdenk
3658c609719bSwdenk
3659c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
36607152b1d0Swdenkimages ready for download to / installation on your system:
3661c609719bSwdenk
3662c609719bSwdenk- "u-boot.bin" is a raw binary image
3663c609719bSwdenk- "u-boot" is an image in ELF binary format
3664c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
3665c609719bSwdenk
3666baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
3667baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
3668baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
3669baf31249SMarian Balakowicz
3670baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
3671baf31249SMarian Balakowicz
3672baf31249SMarian Balakowicz	make O=/tmp/build distclean
3673baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
3674baf31249SMarian Balakowicz	make O=/tmp/build all
3675baf31249SMarian Balakowicz
3676baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
3677baf31249SMarian Balakowicz
3678baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3679baf31249SMarian Balakowicz	make distclean
3680baf31249SMarian Balakowicz	make NAME_config
3681baf31249SMarian Balakowicz	make all
3682baf31249SMarian Balakowicz
3683baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
3684baf31249SMarian Balakowiczvariable.
3685baf31249SMarian Balakowicz
3686c609719bSwdenk
3687c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
3688c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
3689c609719bSwdenknative "make".
3690c609719bSwdenk
3691c609719bSwdenk
3692c609719bSwdenkIf the system board that you have is not listed, then you will need
3693c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
3694c609719bSwdenksteps:
3695c609719bSwdenk
3696c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
36974d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
36984d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
3699c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
370085ec0bccSwdenk    files you need. In your board directory, you will need at least
370185ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
370285ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
370385ec0bccSwdenk    your board
3704c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
3705c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
370685ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3707c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3708c609719bSwdenk    to be installed on your target system.
370985ec0bccSwdenk6.  Debug and solve any problems that might arise.
3710c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3711c609719bSwdenk
3712c609719bSwdenk
3713c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3714c609719bSwdenk==============================================================
3715c609719bSwdenk
3716c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3717c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3718c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3719c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3720218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3721c609719bSwdenk
3722c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3723c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3724c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3725c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3726c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
37277152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3728218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3729218ca724SWolfgang Denkyou can type
3730c609719bSwdenk
3731c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3732c609719bSwdenk
3733c609719bSwdenkor to build on a native PowerPC system you can type
3734c609719bSwdenk
3735c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3736c609719bSwdenk
3737218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3738218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3739218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3740218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3741218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3742218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3743218ca724SWolfgang Denkvariable. For example:
3744baf31249SMarian Balakowicz
3745baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3746baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3747baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3748baf31249SMarian Balakowicz
3749218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3750218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3751218ca724SWolfgang Denkduring the whole build process.
3752baf31249SMarian Balakowicz
3753baf31249SMarian Balakowicz
3754c609719bSwdenkSee also "U-Boot Porting Guide" below.
3755c609719bSwdenk
3756c609719bSwdenk
3757c609719bSwdenkMonitor Commands - Overview:
3758c609719bSwdenk============================
3759c609719bSwdenk
3760c609719bSwdenkgo	- start application at address 'addr'
3761c609719bSwdenkrun	- run commands in an environment variable
3762c609719bSwdenkbootm	- boot application image from memory
3763c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
376444f074c7SMarek Vasutbootz   - boot zImage from memory
3765c609719bSwdenktftpboot- boot image via network using TFTP protocol
3766c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3767c609719bSwdenk	       (and eventually "gatewayip")
37681fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
3769c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3770c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3771c609719bSwdenkloads	- load S-Record file over serial line
3772c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3773c609719bSwdenkmd	- memory display
3774c609719bSwdenkmm	- memory modify (auto-incrementing)
3775c609719bSwdenknm	- memory modify (constant address)
3776c609719bSwdenkmw	- memory write (fill)
3777c609719bSwdenkcp	- memory copy
3778c609719bSwdenkcmp	- memory compare
3779c609719bSwdenkcrc32	- checksum calculation
37800f89c54bSPeter Tyseri2c	- I2C sub-system
3781c609719bSwdenksspi	- SPI utility commands
3782c609719bSwdenkbase	- print or set address offset
3783c609719bSwdenkprintenv- print environment variables
3784c609719bSwdenksetenv	- set environment variables
3785c609719bSwdenksaveenv - save environment variables to persistent storage
3786c609719bSwdenkprotect - enable or disable FLASH write protection
3787c609719bSwdenkerase	- erase FLASH memory
3788c609719bSwdenkflinfo	- print FLASH memory information
3789c609719bSwdenkbdinfo	- print Board Info structure
3790c609719bSwdenkiminfo	- print header information for application image
3791c609719bSwdenkconinfo - print console devices and informations
3792c609719bSwdenkide	- IDE sub-system
3793c609719bSwdenkloop	- infinite loop on address range
379456523f12Swdenkloopw	- infinite write loop on address range
3795c609719bSwdenkmtest	- simple RAM test
3796c609719bSwdenkicache	- enable or disable instruction cache
3797c609719bSwdenkdcache	- enable or disable data cache
3798c609719bSwdenkreset	- Perform RESET of the CPU
3799c609719bSwdenkecho	- echo args to console
3800c609719bSwdenkversion - print monitor version
3801c609719bSwdenkhelp	- print online help
3802c609719bSwdenk?	- alias for 'help'
3803c609719bSwdenk
3804c609719bSwdenk
3805c609719bSwdenkMonitor Commands - Detailed Description:
3806c609719bSwdenk========================================
3807c609719bSwdenk
3808c609719bSwdenkTODO.
3809c609719bSwdenk
3810c609719bSwdenkFor now: just type "help <command>".
3811c609719bSwdenk
3812c609719bSwdenk
3813c609719bSwdenkEnvironment Variables:
3814c609719bSwdenk======================
3815c609719bSwdenk
3816c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3817c609719bSwdenkcan be made persistent by saving to Flash memory.
3818c609719bSwdenk
3819c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3820c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3821c609719bSwdenkwithout a value can be used to delete a variable from the
3822c609719bSwdenkenvironment. As long as you don't save the environment you are
3823c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3824c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3825c609719bSwdenk
3826c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3827c96f86eeSWolfgang Denk
3828c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3829c609719bSwdenk
3830c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3831c609719bSwdenk
3832c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3833c609719bSwdenk
3834c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3835c609719bSwdenk
3836c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3837c609719bSwdenk
3838c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3839c609719bSwdenk
38407d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
38417d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
38427d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
38437d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
38447d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
38457d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
3846c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3847c3624e6eSGrant Likely		  bootm_mapsize.
3848c3624e6eSGrant Likely
3849c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3850c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
3851c3624e6eSGrant Likely		  defines the size of the memory region starting at base
3852c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
3853c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
3854c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
3855c3624e6eSGrant Likely		  used otherwise.
38567d721e34SBartlomiej Sieka
38577d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
38587d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
38597d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
38607d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
38617d721e34SBartlomiej Sieka		  environment variable.
38627d721e34SBartlomiej Sieka
38634bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
38644bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
38654bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
38664bae9090SBartlomiej Sieka
3867c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
3868c609719bSwdenk		  "bootp" will just load perform a lookup of the
3869c609719bSwdenk		  configuration from the BOOTP server, but not try to
3870c609719bSwdenk		  load any image using TFTP
3871c609719bSwdenk
3872c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
3873c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
3874c609719bSwdenk		  be automatically started (by internally calling
3875c609719bSwdenk		  "bootm")
3876c609719bSwdenk
38774a6fd34bSwdenk		  If set to "no", a standalone image passed to the
38784a6fd34bSwdenk		  "bootm" command will be copied to the load address
38794a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
38804a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
38814a6fd34bSwdenk		  data.
38824a6fd34bSwdenk
3883a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
3884a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
3885fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
3886fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
3887fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
3888fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
3889fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
3890fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
3891fa34f6b2SShawn Guo		  access it during the boot procedure.
3892fa34f6b2SShawn Guo
3893a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
3894a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
3895a28afca5SDavid A. Long		  to work it must reside in writable memory, have
3896a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
3897a28afca5SDavid A. Long		  add the information it needs into it, and the memory
3898a28afca5SDavid A. Long		  must be accessible by the kernel.
3899a28afca5SDavid A. Long
3900eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
3901eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
3902eea63e05SSimon Glass		  defined.
3903eea63e05SSimon Glass
390417ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
390517ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
390617ea1177Swdenk		  mode (400kHZ). This environment variable is used in
390717ea1177Swdenk		  initialization code. So, for changes to be effective
390817ea1177Swdenk		  it must be saved and board must be reset.
390917ea1177Swdenk
3910c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
3911c609719bSwdenk		  If this variable is not set, initrd images will be
3912c609719bSwdenk		  copied to the highest possible address in RAM; this
3913c609719bSwdenk		  is usually what you want since it allows for
3914c609719bSwdenk		  maximum initrd size. If for some reason you want to
3915c609719bSwdenk		  make sure that the initrd image is loaded below the
39166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3917c609719bSwdenk		  variable to a value of "no" or "off" or "0".
3918c609719bSwdenk		  Alternatively, you can set it to a maximum upper
3919c609719bSwdenk		  address to use (U-Boot will still check that it
3920c609719bSwdenk		  does not overwrite the U-Boot stack and data).
3921c609719bSwdenk
3922c609719bSwdenk		  For instance, when you have a system with 16 MB
39237152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
3924c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
3925c609719bSwdenk		  the "bootargs" variable. However, now you must make
39267152b1d0Swdenk		  sure that the initrd image is placed in the first
3927c609719bSwdenk		  12 MB as well - this can be done with
3928c609719bSwdenk
3929c609719bSwdenk		  setenv initrd_high 00c00000
3930c609719bSwdenk
393138b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
393238b99261Swdenk		  indication to U-Boot that all addresses are legal
393338b99261Swdenk		  for the Linux kernel, including addresses in flash
393438b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
393538b99261Swdenk		  ramdisk at all. This may be useful to reduce the
393638b99261Swdenk		  boot time on your system, but requires that this
393738b99261Swdenk		  feature is supported by your Linux kernel.
393838b99261Swdenk
3939c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
3940c609719bSwdenk
3941c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
3942dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
3943c609719bSwdenk
3944c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
3945c609719bSwdenk
3946c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
3947c609719bSwdenk
3948c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
3949c609719bSwdenk
3950c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
3951c609719bSwdenk
3952c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
3953c609719bSwdenk
3954e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
3955a3d991bdSwdenk
3956e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
3957e2a53458SMike Frysinger		  For example you can do the following
3958a3d991bdSwdenk
395948690d80SHeiko Schocher		  => setenv ethact FEC
396048690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
396148690d80SHeiko Schocher		  => setenv ethact SCC
396248690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
3963a3d991bdSwdenk
3964e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
3965e1692577SMatthias Fuchs		  available network interfaces.
3966e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
3967e1692577SMatthias Fuchs
3968a3d991bdSwdenk  netretry	- When set to "no" each network operation will
3969a3d991bdSwdenk		  either succeed or fail without retrying.
39706e592385Swdenk		  When set to "once" the network operation will
39716e592385Swdenk		  fail when all the available network interfaces
39726e592385Swdenk		  are tried once without success.
3973a3d991bdSwdenk		  Useful on scripts which control the retry operation
3974a3d991bdSwdenk		  themselves.
3975a3d991bdSwdenk
3976b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
3977a1cf027aSJean-Christophe PLAGNIOL-VILLARD
397828cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
3979ecb0ccd9SWolfgang Denk		  UDP source port.
3980ecb0ccd9SWolfgang Denk
398128cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
398228cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
398328cb9375SWolfgang Denk
3984c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
3985c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
3986c96f86eeSWolfgang Denk
3987c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
3988c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
3989c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
3990c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
3991c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
3992c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
3993c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
3994c96f86eeSWolfgang Denk
3995a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
399611ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
3997a3d991bdSwdenk		  VLAN tagged frames.
3998c609719bSwdenk
3999dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4000dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4001dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4002dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4003dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4004dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4005dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4006dc0b7b0eSJason Hobbs
4007dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4008dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4009dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4010dc0b7b0eSJason Hobbs
4011dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4012dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4013dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4014dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4015dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4016dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4017dc0b7b0eSJason Hobbs
4018c609719bSwdenkThe following environment variables may be used and automatically
4019c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4020c609719bSwdenkdepending the information provided by your boot server:
4021c609719bSwdenk
4022c609719bSwdenk  bootfile	- see above
4023c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4024fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4025c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4026c609719bSwdenk  hostname	- Target hostname
4027c609719bSwdenk  ipaddr	- see above
4028c609719bSwdenk  netmask	- Subnet Mask
4029c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4030c609719bSwdenk  serverip	- see above
4031c609719bSwdenk
4032c609719bSwdenk
4033c609719bSwdenkThere are two special Environment Variables:
4034c609719bSwdenk
4035c609719bSwdenk  serial#	- contains hardware identification information such
4036c609719bSwdenk		  as type string and/or serial number
4037c609719bSwdenk  ethaddr	- Ethernet address
4038c609719bSwdenk
4039c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4040c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4041c609719bSwdenkonce they have been set once.
4042c609719bSwdenk
4043c609719bSwdenk
4044c1551ea8SstroeseFurther special Environment Variables:
4045c1551ea8Sstroese
4046c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4047c1551ea8Sstroese		  with the "version" command. This variable is
4048c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4049c1551ea8Sstroese
4050c1551ea8Sstroese
4051c609719bSwdenkPlease note that changes to some configuration parameters may take
4052c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4053c609719bSwdenk
4054c609719bSwdenk
4055f07771ccSwdenkCommand Line Parsing:
4056f07771ccSwdenk=====================
4057f07771ccSwdenk
4058f07771ccSwdenkThere are two different command line parsers available with U-Boot:
40597152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
4060f07771ccSwdenk
4061f07771ccSwdenkOld, simple command line parser:
4062f07771ccSwdenk--------------------------------
4063f07771ccSwdenk
4064f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4065f07771ccSwdenk- several commands on one line, separated by ';'
4066fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4067f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4068f07771ccSwdenk  for example:
4069fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4070f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4071f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4072f07771ccSwdenk
4073f07771ccSwdenkHush shell:
4074f07771ccSwdenk-----------
4075f07771ccSwdenk
4076f07771ccSwdenk- similar to Bourne shell, with control structures like
4077f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4078f07771ccSwdenk  until...do...done, ...
4079f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4080f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4081f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4082f07771ccSwdenk  command
4083f07771ccSwdenk
4084f07771ccSwdenkGeneral rules:
4085f07771ccSwdenk--------------
4086f07771ccSwdenk
4087f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4088f07771ccSwdenk    command) contains several commands separated by semicolon, and
4089f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4090f07771ccSwdenk    executed anyway.
4091f07771ccSwdenk
4092f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
409311ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4094f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4095f07771ccSwdenk    variables are not executed.
4096f07771ccSwdenk
4097c609719bSwdenkNote for Redundant Ethernet Interfaces:
4098c609719bSwdenk=======================================
4099c609719bSwdenk
410011ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4101c609719bSwdenksuch configurations and is capable of automatic selection of a
41027152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4103c609719bSwdenk
4104c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4105c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4106c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4107c609719bSwdenk
4108c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4109c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4110c609719bSwdenkding setting in the environment; if the corresponding environment
4111c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4112c609719bSwdenk
4113c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4114c609719bSwdenk  environment, the SROM's address is used.
4115c609719bSwdenk
4116c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4117c609719bSwdenk  environment exists, then the value from the environment variable is
4118c609719bSwdenk  used.
4119c609719bSwdenk
4120c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4121c609719bSwdenk  both addresses are the same, this MAC address is used.
4122c609719bSwdenk
4123c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4124c609719bSwdenk  addresses differ, the value from the environment is used and a
4125c609719bSwdenk  warning is printed.
4126c609719bSwdenk
4127c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4128c609719bSwdenk  is raised.
4129c609719bSwdenk
4130ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4131ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4132ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4133ecee9324SBen WarrenThe naming convention is as follows:
4134ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4135c609719bSwdenk
4136c609719bSwdenkImage Formats:
4137c609719bSwdenk==============
4138c609719bSwdenk
41393310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
41403310c549SMarian Balakowiczimages in two formats:
41413310c549SMarian Balakowicz
41423310c549SMarian BalakowiczNew uImage format (FIT)
41433310c549SMarian Balakowicz-----------------------
41443310c549SMarian Balakowicz
41453310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
41463310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
41473310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
41483310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
41493310c549SMarian Balakowicz
41503310c549SMarian Balakowicz
41513310c549SMarian BalakowiczOld uImage format
41523310c549SMarian Balakowicz-----------------
41533310c549SMarian Balakowicz
41543310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
41553310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
41563310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4157c609719bSwdenk
4158c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4159c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4160f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4161f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4162f5ed9e39SPeter Tyser  INTEGRITY).
41637b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4164afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4165afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4166c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4167c609719bSwdenk* Load Address
4168c609719bSwdenk* Entry Point
4169c609719bSwdenk* Image Name
4170c609719bSwdenk* Image Timestamp
4171c609719bSwdenk
4172c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4173c609719bSwdenkand the data portions of the image are secured against corruption by
4174c609719bSwdenkCRC32 checksums.
4175c609719bSwdenk
4176c609719bSwdenk
4177c609719bSwdenkLinux Support:
4178c609719bSwdenk==============
4179c609719bSwdenk
4180c609719bSwdenkAlthough U-Boot should support any OS or standalone application
41817152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4182c609719bSwdenkU-Boot.
4183c609719bSwdenk
4184c609719bSwdenkU-Boot includes many features that so far have been part of some
4185c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4186c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4187c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
41887152b1d0Swdenkserves several purposes:
4189c609719bSwdenk
4190c609719bSwdenk- the same features can be used for other OS or standalone
4191c609719bSwdenk  applications (for instance: using compressed images to reduce the
4192c609719bSwdenk  Flash memory footprint)
4193c609719bSwdenk
4194c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
41957152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4196c609719bSwdenk
4197c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4198c609719bSwdenk  images; of course this also means that different kernel images can
4199c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4200c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4201c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4202c609719bSwdenk  software is easier now.
4203c609719bSwdenk
4204c609719bSwdenk
4205c609719bSwdenkLinux HOWTO:
4206c609719bSwdenk============
4207c609719bSwdenk
4208c609719bSwdenkPorting Linux to U-Boot based systems:
4209c609719bSwdenk---------------------------------------
4210c609719bSwdenk
4211c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4212c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4213c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4214c609719bSwdenkLinux :-).
4215c609719bSwdenk
4216a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4217c609719bSwdenk
4218c609719bSwdenkJust make sure your machine specific header file (for instance
4219c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
42201dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
42211dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
42226d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4223c609719bSwdenk
4224c609719bSwdenk
4225c609719bSwdenkConfiguring the Linux kernel:
4226c609719bSwdenk-----------------------------
4227c609719bSwdenk
4228c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4229c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4230c609719bSwdenk
4231c609719bSwdenk
4232c609719bSwdenkBuilding a Linux Image:
4233c609719bSwdenk-----------------------
4234c609719bSwdenk
423524ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
423624ee89b9Swdenknot used. If you use recent kernel source, a new build target
423724ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
423824ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
423924ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
424024ee89b9Swdenk100% compatible format.
4241c609719bSwdenk
4242c609719bSwdenkExample:
4243c609719bSwdenk
4244c609719bSwdenk	make TQM850L_config
4245c609719bSwdenk	make oldconfig
4246c609719bSwdenk	make dep
424724ee89b9Swdenk	make uImage
4248c609719bSwdenk
424924ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
425024ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
425124ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
4252c609719bSwdenk
425324ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
425424ee89b9Swdenk
425524ee89b9Swdenk* convert the kernel into a raw binary image:
425624ee89b9Swdenk
425724ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
425824ee89b9Swdenk				 -R .note -R .comment \
425924ee89b9Swdenk				 -S vmlinux linux.bin
426024ee89b9Swdenk
426124ee89b9Swdenk* compress the binary image:
426224ee89b9Swdenk
426324ee89b9Swdenk	gzip -9 linux.bin
426424ee89b9Swdenk
426524ee89b9Swdenk* package compressed binary image for U-Boot:
426624ee89b9Swdenk
426724ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
426824ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
426924ee89b9Swdenk		-d linux.bin.gz uImage
427024ee89b9Swdenk
427124ee89b9Swdenk
427224ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
427324ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
427424ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
427524ee89b9Swdenkbyte header containing information about target architecture,
427624ee89b9Swdenkoperating system, image type, compression method, entry points, time
427724ee89b9Swdenkstamp, CRC32 checksums, etc.
427824ee89b9Swdenk
427924ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
428024ee89b9Swdenkprint the header information, or to build new images.
4281c609719bSwdenk
4282c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
4283c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
4284c609719bSwdenkchecksum verification:
4285c609719bSwdenk
4286c609719bSwdenk	tools/mkimage -l image
4287c609719bSwdenk	  -l ==> list image header information
4288c609719bSwdenk
4289c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
4290c609719bSwdenkfrom a "data file" which is used as image payload:
4291c609719bSwdenk
4292c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4293c609719bSwdenk		      -n name -d data_file image
4294c609719bSwdenk	  -A ==> set architecture to 'arch'
4295c609719bSwdenk	  -O ==> set operating system to 'os'
4296c609719bSwdenk	  -T ==> set image type to 'type'
4297c609719bSwdenk	  -C ==> set compression type 'comp'
4298c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
4299c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
4300c609719bSwdenk	  -n ==> set image name to 'name'
4301c609719bSwdenk	  -d ==> use image data from 'datafile'
4302c609719bSwdenk
430369459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
430469459791Swdenkaddress (0x00000000), but the entry point address depends on the
430569459791Swdenkkernel version:
4306c609719bSwdenk
4307c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
430824ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
4309c609719bSwdenk
4310c609719bSwdenkSo a typical call to build a U-Boot image would read:
4311c609719bSwdenk
431224ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
431324ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
4314a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
431524ee89b9Swdenk	> examples/uImage.TQM850L
431624ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4317c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4318c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4319c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4320c609719bSwdenk	Load Address: 0x00000000
432124ee89b9Swdenk	Entry Point:  0x00000000
4322c609719bSwdenk
4323c609719bSwdenkTo verify the contents of the image (or check for corruption):
4324c609719bSwdenk
432524ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
432624ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4327c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4328c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4329c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4330c609719bSwdenk	Load Address: 0x00000000
433124ee89b9Swdenk	Entry Point:  0x00000000
4332c609719bSwdenk
4333c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
4334c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
4335c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
4336c609719bSwdenkneed to be uncompressed:
4337c609719bSwdenk
4338a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
433924ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
434024ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
4341a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
434224ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
434324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4344c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4345c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
4346c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
4347c609719bSwdenk	Load Address: 0x00000000
434824ee89b9Swdenk	Entry Point:  0x00000000
4349c609719bSwdenk
4350c609719bSwdenk
4351c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
4352c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
4353c609719bSwdenk
4354c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
4355c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
4356c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4357c609719bSwdenk	Image Name:   Simple Ramdisk Image
4358c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
4359c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4360c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4361c609719bSwdenk	Load Address: 0x00000000
4362c609719bSwdenk	Entry Point:  0x00000000
4363c609719bSwdenk
4364c609719bSwdenk
4365c609719bSwdenkInstalling a Linux Image:
4366c609719bSwdenk-------------------------
4367c609719bSwdenk
4368c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4369c609719bSwdenkyou must convert the image to S-Record format:
4370c609719bSwdenk
4371c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4372c609719bSwdenk
4373c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4374c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4375c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4376c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4377c609719bSwdenkcommand.
4378c609719bSwdenk
4379c609719bSwdenkExample: install the image to address 0x40100000 (which on the
4380c609719bSwdenkTQM8xxL is in the first Flash bank):
4381c609719bSwdenk
4382c609719bSwdenk	=> erase 40100000 401FFFFF
4383c609719bSwdenk
4384c609719bSwdenk	.......... done
4385c609719bSwdenk	Erased 8 sectors
4386c609719bSwdenk
4387c609719bSwdenk	=> loads 40100000
4388c609719bSwdenk	## Ready for S-Record download ...
4389c609719bSwdenk	~>examples/image.srec
4390c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4391c609719bSwdenk	...
4392c609719bSwdenk	15989 15990 15991 15992
4393c609719bSwdenk	[file transfer complete]
4394c609719bSwdenk	[connected]
4395c609719bSwdenk	## Start Addr = 0x00000000
4396c609719bSwdenk
4397c609719bSwdenk
4398c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
4399c609719bSwdenkthis includes a checksum verification so you can be sure no data
4400c609719bSwdenkcorruption happened:
4401c609719bSwdenk
4402c609719bSwdenk	=> imi 40100000
4403c609719bSwdenk
4404c609719bSwdenk	## Checking Image at 40100000 ...
4405c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4406c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4407c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4408c609719bSwdenk	   Load Address: 00000000
4409c609719bSwdenk	   Entry Point:	 0000000c
4410c609719bSwdenk	   Verifying Checksum ... OK
4411c609719bSwdenk
4412c609719bSwdenk
4413c609719bSwdenkBoot Linux:
4414c609719bSwdenk-----------
4415c609719bSwdenk
4416c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
4417c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
4418c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
4419c609719bSwdenkparameters. You can check and modify this variable using the
4420c609719bSwdenk"printenv" and "setenv" commands:
4421c609719bSwdenk
4422c609719bSwdenk
4423c609719bSwdenk	=> printenv bootargs
4424c609719bSwdenk	bootargs=root=/dev/ram
4425c609719bSwdenk
4426c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4427c609719bSwdenk
4428c609719bSwdenk	=> printenv bootargs
4429c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4430c609719bSwdenk
4431c609719bSwdenk	=> bootm 40020000
4432c609719bSwdenk	## Booting Linux kernel at 40020000 ...
4433c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
4434c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4435c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
4436c609719bSwdenk	   Load Address: 00000000
4437c609719bSwdenk	   Entry Point:	 0000000c
4438c609719bSwdenk	   Verifying Checksum ... OK
4439c609719bSwdenk	   Uncompressing Kernel Image ... OK
4440c609719bSwdenk	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
4441c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4442c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4443c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4444c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4445c609719bSwdenk	...
4446c609719bSwdenk
444711ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
44487152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
4449c609719bSwdenkformat!) to the "bootm" command:
4450c609719bSwdenk
4451c609719bSwdenk	=> imi 40100000 40200000
4452c609719bSwdenk
4453c609719bSwdenk	## Checking Image at 40100000 ...
4454c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4455c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4456c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4457c609719bSwdenk	   Load Address: 00000000
4458c609719bSwdenk	   Entry Point:	 0000000c
4459c609719bSwdenk	   Verifying Checksum ... OK
4460c609719bSwdenk
4461c609719bSwdenk	## Checking Image at 40200000 ...
4462c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4463c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4464c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4465c609719bSwdenk	   Load Address: 00000000
4466c609719bSwdenk	   Entry Point:	 00000000
4467c609719bSwdenk	   Verifying Checksum ... OK
4468c609719bSwdenk
4469c609719bSwdenk	=> bootm 40100000 40200000
4470c609719bSwdenk	## Booting Linux kernel at 40100000 ...
4471c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4472c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4473c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4474c609719bSwdenk	   Load Address: 00000000
4475c609719bSwdenk	   Entry Point:	 0000000c
4476c609719bSwdenk	   Verifying Checksum ... OK
4477c609719bSwdenk	   Uncompressing Kernel Image ... OK
4478c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
4479c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4480c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4481c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4482c609719bSwdenk	   Load Address: 00000000
4483c609719bSwdenk	   Entry Point:	 00000000
4484c609719bSwdenk	   Verifying Checksum ... OK
4485c609719bSwdenk	   Loading Ramdisk ... OK
4486c609719bSwdenk	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
4487c609719bSwdenk	Boot arguments: root=/dev/ram
4488c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4489c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4490c609719bSwdenk	...
4491c609719bSwdenk	RAMDISK: Compressed image found at block 0
4492c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
4493c609719bSwdenk
4494c609719bSwdenk	bash#
4495c609719bSwdenk
44960267768eSMatthew McClintockBoot Linux and pass a flat device tree:
44970267768eSMatthew McClintock-----------
44980267768eSMatthew McClintock
44990267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
45000267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
45010267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
45020267768eSMatthew McClintockflat device tree:
45030267768eSMatthew McClintock
45040267768eSMatthew McClintock=> print oftaddr
45050267768eSMatthew McClintockoftaddr=0x300000
45060267768eSMatthew McClintock=> print oft
45070267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
45080267768eSMatthew McClintock=> tftp $oftaddr $oft
45090267768eSMatthew McClintockSpeed: 1000, full duplex
45100267768eSMatthew McClintockUsing TSEC0 device
45110267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
45120267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
45130267768eSMatthew McClintockLoad address: 0x300000
45140267768eSMatthew McClintockLoading: #
45150267768eSMatthew McClintockdone
45160267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
45170267768eSMatthew McClintock=> tftp $loadaddr $bootfile
45180267768eSMatthew McClintockSpeed: 1000, full duplex
45190267768eSMatthew McClintockUsing TSEC0 device
45200267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
45210267768eSMatthew McClintockFilename 'uImage'.
45220267768eSMatthew McClintockLoad address: 0x200000
45230267768eSMatthew McClintockLoading:############
45240267768eSMatthew McClintockdone
45250267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
45260267768eSMatthew McClintock=> print loadaddr
45270267768eSMatthew McClintockloadaddr=200000
45280267768eSMatthew McClintock=> print oftaddr
45290267768eSMatthew McClintockoftaddr=0x300000
45300267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
45310267768eSMatthew McClintock## Booting image at 00200000 ...
45320267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
45330267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
45340267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
45350267768eSMatthew McClintock   Load Address: 00000000
45360267768eSMatthew McClintock   Entry Point:	 00000000
45370267768eSMatthew McClintock   Verifying Checksum ... OK
45380267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
45390267768eSMatthew McClintockBooting using flat device tree at 0x300000
45400267768eSMatthew McClintockUsing MPC85xx ADS machine description
45410267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
45420267768eSMatthew McClintock[snip]
45430267768eSMatthew McClintock
45440267768eSMatthew McClintock
45456069ff26SwdenkMore About U-Boot Image Types:
45466069ff26Swdenk------------------------------
45476069ff26Swdenk
45486069ff26SwdenkU-Boot supports the following image types:
45496069ff26Swdenk
45506069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
45516069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
45526069ff26Swdenk	well) you can continue to work in U-Boot after return from
45536069ff26Swdenk	the Standalone Program.
45546069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
45556069ff26Swdenk	will take over control completely. Usually these programs
45566069ff26Swdenk	will install their own set of exception handlers, device
45576069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
45586069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
45596069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
45606069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
45616069ff26Swdenk	being started.
45626069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
45636069ff26Swdenk	(Linux) kernel image and one or more data images like
45646069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
45656069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
45666069ff26Swdenk	server provides just a single image file, but you want to get
45676069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
45686069ff26Swdenk
45696069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
45706069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
45716069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
45726069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
45736069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
45746069ff26Swdenk	a multiple of 4 bytes).
45756069ff26Swdenk
45766069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
45776069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
45786069ff26Swdenk	flash memory.
45796069ff26Swdenk
45806069ff26Swdenk   "Script files" are command sequences that will be executed by
45816069ff26Swdenk	U-Boot's command interpreter; this feature is especially
45826069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
45836069ff26Swdenk	as command interpreter.
45846069ff26Swdenk
458544f074c7SMarek VasutBooting the Linux zImage:
458644f074c7SMarek Vasut-------------------------
458744f074c7SMarek Vasut
458844f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
458944f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
459044f074c7SMarek Vasutas the syntax of "bootm" command.
459144f074c7SMarek Vasut
4592017e1f3fSMarek VasutNote, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
4593017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
4594017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
4595017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
4596017e1f3fSMarek Vasut
4597c609719bSwdenk
4598c609719bSwdenkStandalone HOWTO:
4599c609719bSwdenk=================
4600c609719bSwdenk
4601c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
4602c609719bSwdenkrun "standalone" applications, which can use some resources of
4603c609719bSwdenkU-Boot like console I/O functions or interrupt services.
4604c609719bSwdenk
4605c609719bSwdenkTwo simple examples are included with the sources:
4606c609719bSwdenk
4607c609719bSwdenk"Hello World" Demo:
4608c609719bSwdenk-------------------
4609c609719bSwdenk
4610c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
4611c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
4612c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
4613c609719bSwdenklike that:
4614c609719bSwdenk
4615c609719bSwdenk	=> loads
4616c609719bSwdenk	## Ready for S-Record download ...
4617c609719bSwdenk	~>examples/hello_world.srec
4618c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4619c609719bSwdenk	[file transfer complete]
4620c609719bSwdenk	[connected]
4621c609719bSwdenk	## Start Addr = 0x00040004
4622c609719bSwdenk
4623c609719bSwdenk	=> go 40004 Hello World! This is a test.
4624c609719bSwdenk	## Starting application at 0x00040004 ...
4625c609719bSwdenk	Hello World
4626c609719bSwdenk	argc = 7
4627c609719bSwdenk	argv[0] = "40004"
4628c609719bSwdenk	argv[1] = "Hello"
4629c609719bSwdenk	argv[2] = "World!"
4630c609719bSwdenk	argv[3] = "This"
4631c609719bSwdenk	argv[4] = "is"
4632c609719bSwdenk	argv[5] = "a"
4633c609719bSwdenk	argv[6] = "test."
4634c609719bSwdenk	argv[7] = "<NULL>"
4635c609719bSwdenk	Hit any key to exit ...
4636c609719bSwdenk
4637c609719bSwdenk	## Application terminated, rc = 0x0
4638c609719bSwdenk
4639c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
4640c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
4641c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
4642c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
4643c609719bSwdenkcharacter, but this is just a demo program. The application can be
4644c609719bSwdenkcontrolled by the following keys:
4645c609719bSwdenk
4646c609719bSwdenk	? - print current values og the CPM Timer registers
4647c609719bSwdenk	b - enable interrupts and start timer
4648c609719bSwdenk	e - stop timer and disable interrupts
4649c609719bSwdenk	q - quit application
4650c609719bSwdenk
4651c609719bSwdenk	=> loads
4652c609719bSwdenk	## Ready for S-Record download ...
4653c609719bSwdenk	~>examples/timer.srec
4654c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4655c609719bSwdenk	[file transfer complete]
4656c609719bSwdenk	[connected]
4657c609719bSwdenk	## Start Addr = 0x00040004
4658c609719bSwdenk
4659c609719bSwdenk	=> go 40004
4660c609719bSwdenk	## Starting application at 0x00040004 ...
4661c609719bSwdenk	TIMERS=0xfff00980
4662c609719bSwdenk	Using timer 1
4663c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4664c609719bSwdenk
4665c609719bSwdenkHit 'b':
4666c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
4667c609719bSwdenk	Enabling timer
4668c609719bSwdenkHit '?':
4669c609719bSwdenk	[q, b, e, ?] ........
4670c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4671c609719bSwdenkHit '?':
4672c609719bSwdenk	[q, b, e, ?] .
4673c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4674c609719bSwdenkHit '?':
4675c609719bSwdenk	[q, b, e, ?] .
4676c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4677c609719bSwdenkHit '?':
4678c609719bSwdenk	[q, b, e, ?] .
4679c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4680c609719bSwdenkHit 'e':
4681c609719bSwdenk	[q, b, e, ?] ...Stopping timer
4682c609719bSwdenkHit 'q':
4683c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
4684c609719bSwdenk
4685c609719bSwdenk
468685ec0bccSwdenkMinicom warning:
468785ec0bccSwdenk================
468885ec0bccSwdenk
46897152b1d0SwdenkOver time, many people have reported problems when trying to use the
469085ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
469185ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
4692f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
469385ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
4694e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
4695e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
4696e53515a2SKarl O. Pincfor help with kermit.
4697e53515a2SKarl O. Pinc
469885ec0bccSwdenk
469952f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
470052f52c14Swdenkconfiguration to your "File transfer protocols" section:
470152f52c14Swdenk
470252f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
470352f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
470452f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
470552f52c14Swdenk
470652f52c14Swdenk
4707c609719bSwdenkNetBSD Notes:
4708c609719bSwdenk=============
4709c609719bSwdenk
4710c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
4711c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
4712c609719bSwdenk
4713c609719bSwdenkBuilding requires a cross environment; it is known to work on
4714c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4715c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
4716c609719bSwdenkNote that the cross-powerpc package does not install include files;
4717c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
4718c609719bSwdenkmissing.  This file has to be installed and patched manually:
4719c609719bSwdenk
4720c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
4721c609719bSwdenk	# mkdir powerpc
4722c609719bSwdenk	# ln -s powerpc machine
4723c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4724c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
4725c609719bSwdenk
4726c609719bSwdenkNative builds *don't* work due to incompatibilities between native
4727c609719bSwdenkand U-Boot include files.
4728c609719bSwdenk
4729c609719bSwdenkBooting assumes that (the first part of) the image booted is a
4730c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
4731c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
4732c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
47332a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4734c609719bSwdenk
4735c609719bSwdenk
4736c609719bSwdenkImplementation Internals:
4737c609719bSwdenk=========================
4738c609719bSwdenk
4739c609719bSwdenkThe following is not intended to be a complete description of every
4740c609719bSwdenkimplementation detail. However, it should help to understand the
4741c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
4742c609719bSwdenkhardware.
4743c609719bSwdenk
4744c609719bSwdenk
4745c609719bSwdenkInitial Stack, Global Data:
4746c609719bSwdenk---------------------------
4747c609719bSwdenk
4748c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
4749c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
4750c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
4751c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
4752c609719bSwdenkis not initialized as zero. To be able to get a C environment working
4753c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
4754c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
4755c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
4756c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
4757c609719bSwdenklocked as (mis-) used as memory, etc.
4758c609719bSwdenk
47597152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
47600668236bSWolfgang Denk	U-Boot mailing list:
476143d9616cSwdenk
476243d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
476343d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
476443d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
476543d9616cSwdenk	...
476643d9616cSwdenk
476743d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
476843d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
476943d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
477043d9616cSwdenk	is that the cache is being used as a temporary supply of
477143d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
477211ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
477343d9616cSwdenk	can see how this works by studying the cache architecture and
477443d9616cSwdenk	operation in the architecture and processor-specific manuals.
477543d9616cSwdenk
477643d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
477743d9616cSwdenk	is another option for the system designer to use as an
477811ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
477943d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
478043d9616cSwdenk	board designers haven't used it for something that would
478143d9616cSwdenk	cause you grief during the initial boot! It is frequently not
478243d9616cSwdenk	used.
478343d9616cSwdenk
47846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
478543d9616cSwdenk	with your processor/board/system design. The default value
478643d9616cSwdenk	you will find in any recent u-boot distribution in
47878a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
478843d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
478943d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
479043d9616cSwdenk	that are supposed to respond to that address! That code in
479143d9616cSwdenk	start.S has been around a while and should work as is when
479243d9616cSwdenk	you get the config right.
479343d9616cSwdenk
479443d9616cSwdenk	-Chris Hallinan
479543d9616cSwdenk	DS4.COM, Inc.
479643d9616cSwdenk
4797c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4798c609719bSwdenkcode for the initialization procedures:
4799c609719bSwdenk
4800c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4801c609719bSwdenk  to write it.
4802c609719bSwdenk
480311ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4804c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
48057152b1d0Swdenk  zation is performed later (when relocating to RAM).
4806c609719bSwdenk
4807c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4808c609719bSwdenk  that.
4809c609719bSwdenk
4810c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4811c609719bSwdenknormal global data to share information beween the code. But it
4812c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4813c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4814c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4815c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4816c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4817c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4818c609719bSwdenkreserve for this purpose.
4819c609719bSwdenk
48207152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4821c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4822c609719bSwdenkGCC's implementation.
4823c609719bSwdenk
4824c609719bSwdenkFor PowerPC, the following registers have specific use:
4825c609719bSwdenk	R1:	stack pointer
4826e7670f6cSWolfgang Denk	R2:	reserved for system use
4827c609719bSwdenk	R3-R4:	parameter passing and return values
4828c609719bSwdenk	R5-R10: parameter passing
4829c609719bSwdenk	R13:	small data area pointer
4830c609719bSwdenk	R30:	GOT pointer
4831c609719bSwdenk	R31:	frame pointer
4832c609719bSwdenk
4833e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4834e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4835e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4836c609719bSwdenk
4837e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4838c609719bSwdenk
4839c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4840c609719bSwdenk    address of the global data structure is known at compile time),
4841c609719bSwdenk    but it turned out that reserving a register results in somewhat
4842c609719bSwdenk    smaller code - although the code savings are not that big (on
4843c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4844c609719bSwdenk    624 text + 127 data).
4845c609719bSwdenk
4846c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
48474c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
48484c58eb55SMike Frysinger
4849c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
48504c58eb55SMike Frysinger
4851c609719bSwdenkOn ARM, the following registers are used:
4852c609719bSwdenk
4853c609719bSwdenk	R0:	function argument word/integer result
4854c609719bSwdenk	R1-R3:	function argument word
4855c609719bSwdenk	R9:	GOT pointer
4856c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4857c609719bSwdenk	R11:	argument (frame) pointer
4858c609719bSwdenk	R12:	temporary workspace
4859c609719bSwdenk	R13:	stack pointer
4860c609719bSwdenk	R14:	link register
4861c609719bSwdenk	R15:	program counter
4862c609719bSwdenk
4863c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
4864c609719bSwdenk
48650df01fd3SThomas ChouOn Nios II, the ABI is documented here:
48660df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
48670df01fd3SThomas Chou
48680df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
48690df01fd3SThomas Chou
48700df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
48710df01fd3SThomas Chou    to access small data sections, so gp is free.
48720df01fd3SThomas Chou
4873afc1ce82SMacpaul LinOn NDS32, the following registers are used:
4874afc1ce82SMacpaul Lin
4875afc1ce82SMacpaul Lin	R0-R1:	argument/return
4876afc1ce82SMacpaul Lin	R2-R5:	argument
4877afc1ce82SMacpaul Lin	R15:	temporary register for assembler
4878afc1ce82SMacpaul Lin	R16:	trampoline register
4879afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
4880afc1ce82SMacpaul Lin	R29:	global pointer (GP)
4881afc1ce82SMacpaul Lin	R30:	link register (LP)
4882afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
4883afc1ce82SMacpaul Lin	PC:	program counter (PC)
4884afc1ce82SMacpaul Lin
4885afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
4886afc1ce82SMacpaul Lin
4887d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4888d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
4889c609719bSwdenk
4890c609719bSwdenkMemory Management:
4891c609719bSwdenk------------------
4892c609719bSwdenk
4893c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
4894c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
4895c609719bSwdenk
4896c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
4897c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
4898c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
4899c609719bSwdenkphysical memory banks.
4900c609719bSwdenk
4901c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
4902c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4903c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
4904c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
49056d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4906c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
4907c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
4908c609719bSwdenk
4909c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
4910c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
4911c609719bSwdenk
4912c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
4913c609719bSwdenkthis:
4914c609719bSwdenk
4915c609719bSwdenk	0x0000 0000	Exception Vector code
4916c609719bSwdenk	      :
4917c609719bSwdenk	0x0000 1FFF
4918c609719bSwdenk	0x0000 2000	Free for Application Use
4919c609719bSwdenk	      :
4920c609719bSwdenk	      :
4921c609719bSwdenk
4922c609719bSwdenk	      :
4923c609719bSwdenk	      :
4924c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
4925c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
4926c609719bSwdenk	0x00FC 0000	Malloc Arena
4927c609719bSwdenk	      :
4928c609719bSwdenk	0x00FD FFFF
4929c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
4930c609719bSwdenk	...		eventually: LCD or video framebuffer
4931c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
4932c609719bSwdenk	0x00FF FFFF	[End of RAM]
4933c609719bSwdenk
4934c609719bSwdenk
4935c609719bSwdenkSystem Initialization:
4936c609719bSwdenk----------------------
4937c609719bSwdenk
4938c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
493911ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
4940c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
49417152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
4942c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
4943c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
4944c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
4945c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
4946c609719bSwdenkthe caches and the SIU.
4947c609719bSwdenk
4948c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
4949c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
4950c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4951c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4952c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
4953c609719bSwdenksimple memory test is run that determines the size of the SDRAM
4954c609719bSwdenkbanks.
4955c609719bSwdenk
4956c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
49577152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
4958c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
4959c609719bSwdenk0x00000000, with any additional banks following immediately to create
4960c609719bSwdenkcontiguous memory starting from 0.
4961c609719bSwdenk
4962c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
4963c609719bSwdenkand allocates memory for use by malloc() and for the global Board
4964c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
4965c609719bSwdenkpages, and the final stack is set up.
4966c609719bSwdenk
4967c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
4968c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
4969c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
4970c609719bSwdenknew address in RAM.
4971c609719bSwdenk
4972c609719bSwdenk
4973c609719bSwdenkU-Boot Porting Guide:
4974c609719bSwdenk----------------------
4975c609719bSwdenk
4976c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
49776aff3115Swdenklist, October 2002]
4978c609719bSwdenk
4979c609719bSwdenk
4980c609719bSwdenkint main(int argc, char *argv[])
4981c609719bSwdenk{
4982c609719bSwdenk	sighandler_t no_more_time;
4983c609719bSwdenk
4984c609719bSwdenk	signal(SIGALRM, no_more_time);
4985c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4986c609719bSwdenk
4987c609719bSwdenk	if (available_money > available_manpower) {
49886c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
4989c609719bSwdenk		return 0;
4990c609719bSwdenk	}
4991c609719bSwdenk
4992c609719bSwdenk	Download latest U-Boot source;
4993c609719bSwdenk
49940668236bSWolfgang Denk	Subscribe to u-boot mailing list;
49956aff3115Swdenk
49966c3fef28SJerry Van Baren	if (clueless)
4997c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
4998c609719bSwdenk
4999c609719bSwdenk	while (learning) {
5000c609719bSwdenk		Read the README file in the top level directory;
50017cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
50026c3fef28SJerry Van Baren		Read applicable doc/*.README;
5003c609719bSwdenk		Read the source, Luke;
50046c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5005c609719bSwdenk	}
5006c609719bSwdenk
50076c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
50086c3fef28SJerry Van Baren		Buy a BDI3000;
50096c3fef28SJerry Van Baren	else
5010c609719bSwdenk		Add a lot of aggravation and time;
5011c609719bSwdenk
50126c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
50136c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
50146c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
50156c3fef28SJerry Van Baren	} else {
5016c609719bSwdenk		Create your own board support subdirectory;
50176c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
50186c3fef28SJerry Van Baren	}
50196c3fef28SJerry Van Baren	Edit new board/<myboard> files
50206c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5021c609719bSwdenk
50226c3fef28SJerry Van Baren	while (!accepted) {
5023c609719bSwdenk		while (!running) {
5024c609719bSwdenk			do {
5025c609719bSwdenk				Add / modify source code;
5026c609719bSwdenk			} until (compiles);
5027c609719bSwdenk			Debug;
5028c609719bSwdenk			if (clueless)
5029c609719bSwdenk				email("Hi, I am having problems...");
5030c609719bSwdenk		}
50316c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
50326c3fef28SJerry Van Baren		if (reasonable critiques)
50336c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
50346c3fef28SJerry Van Baren		else
50356c3fef28SJerry Van Baren			Defend code as written;
50366c3fef28SJerry Van Baren	}
5037c609719bSwdenk
5038c609719bSwdenk	return 0;
5039c609719bSwdenk}
5040c609719bSwdenk
5041c609719bSwdenkvoid no_more_time (int sig)
5042c609719bSwdenk{
5043c609719bSwdenk      hire_a_guru();
5044c609719bSwdenk}
5045c609719bSwdenk
5046c609719bSwdenk
5047c609719bSwdenkCoding Standards:
5048c609719bSwdenk-----------------
5049c609719bSwdenk
5050c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
50512c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
50527ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
5053c609719bSwdenk
50542c051651SDetlev ZundelSource files originating from a different project (for example the
50552c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
50562c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
50572c051651SDetlev Zundelsources.
50582c051651SDetlev Zundel
50592c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
50602c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
50612c051651SDetlev Zundelin your code.
5062c609719bSwdenk
5063c178d3daSwdenkPlease also stick to the following formatting rules:
5064180d3f74Swdenk- remove any trailing white space
50657ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5066180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
50677ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5068180d3f74Swdenk- do not add trailing empty lines to source files
5069180d3f74Swdenk
5070c609719bSwdenkSubmissions which do not conform to the standards may be returned
5071c609719bSwdenkwith a request to reformat the changes.
5072c609719bSwdenk
5073c609719bSwdenk
5074c609719bSwdenkSubmitting Patches:
5075c609719bSwdenk-------------------
5076c609719bSwdenk
5077c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5078c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5079c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5080c609719bSwdenk
50810d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5082218ca724SWolfgang Denk
50830668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
50840668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
50850668236bSWolfgang Denk
5086c609719bSwdenkWhen you send a patch, please include the following information with
5087c609719bSwdenkit:
5088c609719bSwdenk
5089c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5090c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5091c609719bSwdenk  patch actually fixes something.
5092c609719bSwdenk
5093c609719bSwdenk* For new features: a description of the feature and your
5094c609719bSwdenk  implementation.
5095c609719bSwdenk
5096c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5097c609719bSwdenk
5098c609719bSwdenk* For major contributions, your entry to the CREDITS file
5099c609719bSwdenk
5100c609719bSwdenk* When you add support for a new board, don't forget to add this
51017ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
5102c609719bSwdenk
5103c609719bSwdenk* If your patch adds new configuration options, don't forget to
5104c609719bSwdenk  document these in the README file.
5105c609719bSwdenk
5106218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5107218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
51087ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5109218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5110218ca724SWolfgang Denk  with some other mail clients.
5111c609719bSwdenk
5112218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5113218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5114218ca724SWolfgang Denk  GNU diff.
51156dff5529Swdenk
5116218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5117218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5118218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5119218ca724SWolfgang Denk  affected files).
5120218ca724SWolfgang Denk
5121218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5122218ca724SWolfgang Denk  and compressed attachments must not be used.
5123c609719bSwdenk
512452f52c14Swdenk* If one logical set of modifications affects or creates several
512552f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
512652f52c14Swdenk
512752f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
512852f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
512952f52c14Swdenk
513052f52c14Swdenk
5131c609719bSwdenkNotes:
5132c609719bSwdenk
5133c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5134c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5135c609719bSwdenk  for any of the boards.
5136c609719bSwdenk
5137c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5138c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5139c609719bSwdenk  returned with a request to re-formatting / split it.
5140c609719bSwdenk
5141c609719bSwdenk* If you modify existing code, make sure that your new code does not
5142c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5143c609719bSwdenk  When adding new features, these should compile conditionally only
5144c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5145c609719bSwdenk  disabled must not need more memory than the old code without your
5146c609719bSwdenk  modification.
514790dc6704Swdenk
51480668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
51490668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
51500668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
51510668236bSWolfgang Denk  bigger than the size limit should be avoided.
5152