xref: /openbmc/u-boot/README (revision 12eba1b49380988fd87cc0b3af44014cca8b71c4)
1c609719bSwdenk#
2eca3aeb3SWolfgang Denk# (C) Copyright 2000 - 2013
3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4c609719bSwdenk#
5eca3aeb3SWolfgang Denk# SPDX-License-Identifier:	GPL-2.0+
6c609719bSwdenk#
7c609719bSwdenk
8c609719bSwdenkSummary:
9c609719bSwdenk========
10c609719bSwdenk
1124ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for
12e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other
13e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to
14e86e5a07Swdenkinitialize and test the hardware or to download and run application
15e86e5a07Swdenkcode.
16c609719bSwdenk
17c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of
1824ee89b9Swdenkthe source code originate in the Linux source tree, we have some
1924ee89b9Swdenkheader files in common, and special provision has been made to
20c609719bSwdenksupport booting of Linux images.
21c609719bSwdenk
22c609719bSwdenkSome attention has been paid to make this software easily
23c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are
24c609719bSwdenkimplemented with the same call interface, so that it's very easy to
25c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used
26c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can
27c609719bSwdenkload and run it dynamically.
28c609719bSwdenk
29c609719bSwdenk
30c609719bSwdenkStatus:
31c609719bSwdenk=======
32c609719bSwdenk
33c609719bSwdenkIn general, all boards for which a configuration option exists in the
34c609719bSwdenkMakefile have been tested to some extent and can be considered
35c609719bSwdenk"working". In fact, many of them are used in production systems.
36c609719bSwdenk
37c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out
3827af930eSAlbert ARIBAUDwho contributed the specific port. The boards.cfg file lists board
39218ca724SWolfgang Denkmaintainers.
40c609719bSwdenk
41adb9d851SRobert P. J. DayNote: There is no CHANGELOG file in the actual U-Boot source tree;
42adb9d851SRobert P. J. Dayit can be created dynamically from the Git log using:
43adb9d851SRobert P. J. Day
44adb9d851SRobert P. J. Day	make CHANGELOG
45adb9d851SRobert P. J. Day
46c609719bSwdenk
47c609719bSwdenkWhere to get help:
48c609719bSwdenk==================
49c609719bSwdenk
50c609719bSwdenkIn case you have questions about, problems with or contributions for
51c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
520c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
530c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
540c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
550c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
56c609719bSwdenk
57c609719bSwdenk
58218ca724SWolfgang DenkWhere to get source code:
59218ca724SWolfgang Denk=========================
60218ca724SWolfgang Denk
61218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
62218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
63218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
64218ca724SWolfgang Denk
65218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
6611ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
67218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
68218ca724SWolfgang Denkdirectory.
69218ca724SWolfgang Denk
70d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
71218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
72218ca724SWolfgang Denk
73218ca724SWolfgang Denk
74c609719bSwdenkWhere we come from:
75c609719bSwdenk===================
76c609719bSwdenk
77c609719bSwdenk- start from 8xxrom sources
7824ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
79c609719bSwdenk- clean up code
80c609719bSwdenk- make it easier to add custom boards
81c609719bSwdenk- make it possible to add other [PowerPC] CPUs
82c609719bSwdenk- extend functions, especially:
83c609719bSwdenk  * Provide extended interface to Linux boot loader
84c609719bSwdenk  * S-Record download
85c609719bSwdenk  * network boot
8611ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
8724ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
88c609719bSwdenk- add other CPU families (starting with ARM)
8924ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
900d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
9124ee89b9Swdenk
9224ee89b9Swdenk
9324ee89b9SwdenkNames and Spelling:
9424ee89b9Swdenk===================
9524ee89b9Swdenk
9624ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
9724ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
9824ee89b9Swdenkin source files etc.). Example:
9924ee89b9Swdenk
10024ee89b9Swdenk	This is the README file for the U-Boot project.
10124ee89b9Swdenk
10224ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
10324ee89b9Swdenk
10424ee89b9Swdenk	include/asm-ppc/u-boot.h
10524ee89b9Swdenk
10624ee89b9Swdenk	#include <asm/u-boot.h>
10724ee89b9Swdenk
10824ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
10924ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
11024ee89b9Swdenk
11124ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
11224ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
113c609719bSwdenk
114c609719bSwdenk
11593f19cc0SwdenkVersioning:
11693f19cc0Swdenk===========
11793f19cc0Swdenk
118360d883aSThomas WeberStarting with the release in October 2008, the names of the releases
119360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning
120360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by
121360d883aSThomas Webernames consisting of the calendar year and month of the release date.
122360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix
123360d883aSThomas Weberreleases in "stable" maintenance trees.
12493f19cc0Swdenk
125360d883aSThomas WeberExamples:
126360d883aSThomas Weber	U-Boot v2009.11	    - Release November 2009
127360d883aSThomas Weber	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
128360d883aSThomas Weber	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
12993f19cc0Swdenk
13093f19cc0Swdenk
131c609719bSwdenkDirectory Hierarchy:
132c609719bSwdenk====================
133c609719bSwdenk
1348d321b81SPeter Tyser/arch			Architecture specific files
1358d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1368d321b81SPeter Tyser    /cpu		CPU specific files
1378d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1388d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1396eb0921aSAndreas Bießmann	/at91		Files specific to Atmel AT91RM9200 CPU
1408d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1418d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1428d321b81SPeter Tyser      /arm925t		Files specific to ARM 925 CPUs
1438d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1448d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1458d321b81SPeter Tyser      /ixp		Files specific to Intel XScale IXP CPUs
1468d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1478d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1488d321b81SPeter Tyser    /lib		Architecture specific library files
1498d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1508d321b81SPeter Tyser    /cpu		CPU specific files
1518d321b81SPeter Tyser    /lib		Architecture specific library files
1528d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1538d321b81SPeter Tyser    /cpu		CPU specific files
1548d321b81SPeter Tyser    /lib		Architecture specific library files
155fea25720SGraeme Russ  /x86			Files generic to x86 architecture
1568d321b81SPeter Tyser    /cpu		CPU specific files
1578d321b81SPeter Tyser    /lib		Architecture specific library files
1588d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1598d321b81SPeter Tyser    /cpu		CPU specific files
1608d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1618d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1628d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1638d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1648d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1658d321b81SPeter Tyser    /lib		Architecture specific library files
1668d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1678d321b81SPeter Tyser    /cpu		CPU specific files
1688d321b81SPeter Tyser    /lib		Architecture specific library files
1698d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1708d321b81SPeter Tyser    /cpu		CPU specific files
17192bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
17280421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1738d321b81SPeter Tyser    /lib		Architecture specific library files
174afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
175afc1ce82SMacpaul Lin    /cpu		CPU specific files
176afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
177afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1788d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1798d321b81SPeter Tyser    /cpu		CPU specific files
1808d321b81SPeter Tyser    /lib		Architecture specific library files
181a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1828d321b81SPeter Tyser    /cpu		CPU specific files
1838d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1848d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1858d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1868d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1878d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
1888d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
1898d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
1908d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
1918d321b81SPeter Tyser    /lib		Architecture specific library files
1928d321b81SPeter Tyser  /sh			Files generic to SH architecture
1938d321b81SPeter Tyser    /cpu		CPU specific files
1948d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
1958d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
1968d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
1978d321b81SPeter Tyser    /lib		Architecture specific library files
1988d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
1998d321b81SPeter Tyser    /cpu		CPU specific files
2008d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2018d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2028d321b81SPeter Tyser    /lib		Architecture specific library files
2038d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2048d321b81SPeter Tyser/board			Board dependent files
2058d321b81SPeter Tyser/common			Misc architecture independent functions
2068d321b81SPeter Tyser/disk			Code for disk drive partition handling
2078d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2088d321b81SPeter Tyser/drivers		Commonly used device drivers
2098d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2108d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2118d321b81SPeter Tyser/include		Header Files
2128d321b81SPeter Tyser/lib			Files generic to all architectures
2138d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2148d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2158d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2168d321b81SPeter Tyser/net			Networking code
2178d321b81SPeter Tyser/post			Power On Self Test
2188d321b81SPeter Tyser/rtc			Real Time Clock drivers
2198d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
220c609719bSwdenk
221c609719bSwdenkSoftware Configuration:
222c609719bSwdenk=======================
223c609719bSwdenk
224c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
225c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
226c609719bSwdenk
227c609719bSwdenkThere are two classes of configuration variables:
228c609719bSwdenk
229c609719bSwdenk* Configuration _OPTIONS_:
230c609719bSwdenk  These are selectable by the user and have names beginning with
231c609719bSwdenk  "CONFIG_".
232c609719bSwdenk
233c609719bSwdenk* Configuration _SETTINGS_:
234c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
235c609719bSwdenk  you don't know what you're doing; they have names beginning with
2366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
237c609719bSwdenk
238c609719bSwdenkLater we will add a configuration tool - probably similar to or even
239c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
240c609719bSwdenkdo the configuration by hand, which means creating some symbolic
241c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
242c609719bSwdenkas an example here.
243c609719bSwdenk
244c609719bSwdenk
245c609719bSwdenkSelection of Processor Architecture and Board Type:
246c609719bSwdenk---------------------------------------------------
247c609719bSwdenk
248c609719bSwdenkFor all supported boards there are ready-to-use default
249c609719bSwdenkconfigurations available; just type "make <board_name>_config".
250c609719bSwdenk
251c609719bSwdenkExample: For a TQM823L module type:
252c609719bSwdenk
253c609719bSwdenk	cd u-boot
254c609719bSwdenk	make TQM823L_config
255c609719bSwdenk
25611ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
257c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
258c609719bSwdenkdirectory according to the instructions in cogent/README.
259c609719bSwdenk
260c609719bSwdenk
261c609719bSwdenkConfiguration Options:
262c609719bSwdenk----------------------
263c609719bSwdenk
264c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
265c609719bSwdenksuch information is kept in a configuration file
266c609719bSwdenk"include/configs/<board_name>.h".
267c609719bSwdenk
268c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
269c609719bSwdenk"include/configs/TQM823L.h".
270c609719bSwdenk
271c609719bSwdenk
2727f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2737f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2747f6c2cbcSwdenkbuild a config tool - later.
2757f6c2cbcSwdenk
2767f6c2cbcSwdenk
277c609719bSwdenkThe following options need to be configured:
278c609719bSwdenk
2792628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
280c609719bSwdenk
2812628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2826ccec449SWolfgang Denk
2836ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
28409ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
285c609719bSwdenk
286c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
287c609719bSwdenk		Define exactly one of
288c609719bSwdenk		CONFIG_CMA286_60_OLD
289c609719bSwdenk--- FIXME --- not tested yet:
290c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
291c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
292c609719bSwdenk
293c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
294c609719bSwdenk		Define exactly one of
295c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
296c609719bSwdenk
297c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
298c609719bSwdenk		Define one or more of
299c609719bSwdenk		CONFIG_CMA302
300c609719bSwdenk
301c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
302c609719bSwdenk		Define one or more of
303c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
30411ccc33fSMarcel Ziswiler					  the LCD display every second with
305c609719bSwdenk					  a "rotator" |\-/|\-/
306c609719bSwdenk
3072535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3082535d602Swdenk		CONFIG_ADSTYPE
3092535d602Swdenk		Possible values are:
3106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3142535d602Swdenk
315cf946c6dSLei Wen- Marvell Family Member
316cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
317cf946c6dSLei Wen					  multiple fs option at one time
318cf946c6dSLei Wen					  for marvell soc family
319cf946c6dSLei Wen
320c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
321c609719bSwdenk		Define exactly one of
322c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
323c609719bSwdenk
32411ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
32566ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
32666ca92a5Swdenk					  get_gclk_freq() cannot work
3275da627a4Swdenk					  e.g. if there is no 32KHz
3285da627a4Swdenk					  reference PIT/RTC clock
32966ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
33066ca92a5Swdenk					  or XTAL/EXTAL)
331c609719bSwdenk
33266ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
33566ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
33675d1ea7fSwdenk			See doc/README.MPC866
33775d1ea7fSwdenk
3386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
33975d1ea7fSwdenk
34075d1ea7fSwdenk		Define this to measure the actual CPU clock instead
34175d1ea7fSwdenk		of relying on the correctness of the configured
34275d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
34375d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
34475d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
34675d1ea7fSwdenk
347506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
348506f3918SHeiko Schocher
349506f3918SHeiko Schocher		Define this option if you want to enable the
350506f3918SHeiko Schocher		ICache only when Code runs from RAM.
351506f3918SHeiko Schocher
35266412c63SKumar Gala- 85xx CPU Options:
353ffd06e02SYork Sun		CONFIG_SYS_PPC64
354ffd06e02SYork Sun
355ffd06e02SYork Sun		Specifies that the core is a 64-bit PowerPC implementation (implements
356ffd06e02SYork Sun		the "64" category of the Power ISA). This is necessary for ePAPR
357ffd06e02SYork Sun		compliance, among other possible reasons.
358ffd06e02SYork Sun
35966412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36066412c63SKumar Gala
36166412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
36266412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
36366412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
36466412c63SKumar Gala
3658f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3668f29084aSKumar Gala
3678f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3688f29084aSKumar Gala		tree nodes for the given platform.
3698f29084aSKumar Gala
370afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
371afa6b551SPrabhakar Kushwaha
372afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
373afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
374afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
375afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
376afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
377afa6b551SPrabhakar Kushwaha		purpose.
378afa6b551SPrabhakar Kushwaha
37933eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
38033eee330SScott Wood
38133eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
38233eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
38333eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
38433eee330SScott Wood
38533eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
38633eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
38733eee330SScott Wood
38833eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
38933eee330SScott Wood		for which the A004510 workaround should be applied.
39033eee330SScott Wood
39133eee330SScott Wood		The rest of SVR is either not relevant to the decision
39233eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
39333eee330SScott Wood		p2041) or is implied by the build target, which controls
39433eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
39533eee330SScott Wood
39633eee330SScott Wood		See Freescale App Note 4493 for more information about
39733eee330SScott Wood		this erratum.
39833eee330SScott Wood
39974fa22edSPrabhakar Kushwaha		CONFIG_A003399_NOR_WORKAROUND
40074fa22edSPrabhakar Kushwaha		Enables a workaround for IFC erratum A003399. It is only
40174fa22edSPrabhakar Kushwaha		requred during NOR boot.
40274fa22edSPrabhakar Kushwaha
40333eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
40433eee330SScott Wood
40533eee330SScott Wood		This is the value to write into CCSR offset 0x18600
40633eee330SScott Wood		according to the A004510 workaround.
40733eee330SScott Wood
40864501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_DDR_ADDR
40964501c66SPriyanka Jain		This value denotes start offset of DDR memory which is
41064501c66SPriyanka Jain		connected exclusively to the DSP cores.
41164501c66SPriyanka Jain
412765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
413765b0bdbSPriyanka Jain		This value denotes start offset of M2 memory
414765b0bdbSPriyanka Jain		which is directly connected to the DSP core.
415765b0bdbSPriyanka Jain
41664501c66SPriyanka Jain		CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
41764501c66SPriyanka Jain		This value denotes start offset of M3 memory which is directly
41864501c66SPriyanka Jain		connected to the DSP core.
41964501c66SPriyanka Jain
420765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
421765b0bdbSPriyanka Jain		This value denotes start offset of DSP CCSR space.
422765b0bdbSPriyanka Jain
423cb93071bSYork Sun		CONFIG_SYS_FSL_DDR_EMU
424cb93071bSYork Sun		Specify emulator support for DDR. Some DDR features such as
425cb93071bSYork Sun		deskew training are not available.
426cb93071bSYork Sun
4276cb461b4SDaniel Schwierzeck- Generic CPU options:
4286cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
4296cb461b4SDaniel Schwierzeck
4306cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
4316cb461b4SDaniel Schwierzeck		values is arch specific.
4326cb461b4SDaniel Schwierzeck
4330b953ffcSMarkus Klotzbuecher- Intel Monahans options:
4346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
4350b953ffcSMarkus Klotzbuecher
4360b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
4370b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
4380b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
4390b953ffcSMarkus Klotzbuecher
4406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
4410b953ffcSMarkus Klotzbuecher
4420b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
4430b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
4440b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
4450b953ffcSMarkus Klotzbuecher		by this value.
4460b953ffcSMarkus Klotzbuecher
44792bbd64eSDaniel Schwierzeck- MIPS CPU options:
44892bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
44992bbd64eSDaniel Schwierzeck
45092bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
45192bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
45292bbd64eSDaniel Schwierzeck		relocation.
45392bbd64eSDaniel Schwierzeck
45492bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
45592bbd64eSDaniel Schwierzeck
45692bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
45792bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
45892bbd64eSDaniel Schwierzeck		Possible values are:
45992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
46092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
46192bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
46292bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
46392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
46492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
46592bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
46692bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
46792bbd64eSDaniel Schwierzeck
46892bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
46992bbd64eSDaniel Schwierzeck
47092bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
47192bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
47292bbd64eSDaniel Schwierzeck
47392bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
47492bbd64eSDaniel Schwierzeck
47592bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
47692bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
47792bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
47892bbd64eSDaniel Schwierzeck
479b67d8816SChristian Riesch- ARM options:
480b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
481b67d8816SChristian Riesch
482b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
483b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
484b67d8816SChristian Riesch
4855356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
4865356f545SAneesh V
4875356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
4885356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
4895356f545SAneesh V		better code density. For ARM architectures that support
4905356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
4915356f545SAneesh V		GCC.
4925356f545SAneesh V
493c5d4752cSStephen Warren		CONFIG_ARM_ERRATA_716044
4940678587fSStephen Warren		CONFIG_ARM_ERRATA_742230
4950678587fSStephen Warren		CONFIG_ARM_ERRATA_743622
4960678587fSStephen Warren		CONFIG_ARM_ERRATA_751472
4970678587fSStephen Warren
4980678587fSStephen Warren		If set, the workarounds for these ARM errata are applied early
4990678587fSStephen Warren		during U-Boot startup. Note that these options force the
5000678587fSStephen Warren		workarounds to be applied; no CPU-type/version detection
5010678587fSStephen Warren		exists, unlike the similar options in the Linux kernel. Do not
5020678587fSStephen Warren		set these options unless they apply!
5030678587fSStephen Warren
504795659dcSStephen Warren- CPU timer options:
505795659dcSStephen Warren		CONFIG_SYS_HZ
506795659dcSStephen Warren
507795659dcSStephen Warren		The frequency of the timer returned by get_timer().
508795659dcSStephen Warren		get_timer() must operate in milliseconds and this CONFIG
509795659dcSStephen Warren		option must be set to 1000.
510795659dcSStephen Warren
5115da627a4Swdenk- Linux Kernel Interface:
512c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
513c609719bSwdenk
514c609719bSwdenk		U-Boot stores all clock information in Hz
515c609719bSwdenk		internally. For binary compatibility with older Linux
516c609719bSwdenk		kernels (which expect the clocks passed in the
517c609719bSwdenk		bd_info data to be in MHz) the environment variable
518c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
519c609719bSwdenk		converts clock data to MHZ before passing it to the
520c609719bSwdenk		Linux kernel.
521c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
522c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
523c609719bSwdenk		default environment.
524c609719bSwdenk
5255da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
5265da627a4Swdenk
52711ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
5285da627a4Swdenk		expect it to be in bytes, others in MB.
5295da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
5305da627a4Swdenk
531fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
532f57f70aaSWolfgang Denk
533f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
534213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
535213bf8c8SGerald Van Baren		concepts).
536213bf8c8SGerald Van Baren
537213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
538213bf8c8SGerald Van Baren		 * New libfdt-based support
539213bf8c8SGerald Van Baren		 * Adds the "fdt" command
5403bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
541213bf8c8SGerald Van Baren
542b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
543b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
544b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
545b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
546f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
547c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
548f57f70aaSWolfgang Denk
54911ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
55011ccc33fSMarcel Ziswiler		addresses
5513bb342fcSKim Phillips
5524e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
5534e253137SKumar Gala
5544e253137SKumar Gala		Board code has addition modification that it wants to make
5554e253137SKumar Gala		to the flat device tree before handing it off to the kernel
5566705d81eSwdenk
5570267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
5580267768eSMatthew McClintock
55911ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
5600267768eSMatthew McClintock		param header, the default value is zero if undefined.
5610267768eSMatthew McClintock
5623887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
5633887c3fbSHeiko Schocher
5643887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
5653887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
5663887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
5673887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
5683887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
5693887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
5703887c3fbSHeiko Schocher
5717eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
5727eb29398SIgor Grinberg
5737eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
5747eb29398SIgor Grinberg		machine type and must be used to specify the machine type
5757eb29398SIgor Grinberg		number as it appears in the ARM machine registry
5767eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
5777eb29398SIgor Grinberg		Only boards that have multiple machine types supported
5787eb29398SIgor Grinberg		in a single configuration file and the machine type is
5797eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
5807eb29398SIgor Grinberg
5810b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5820b2f4ecaSNiklaus Giger
5830b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5840b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5850b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5860b2f4ecaSNiklaus Giger
5870b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5880b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5890b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5900b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5910b2f4ecaSNiklaus Giger
5920b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5930b2f4ecaSNiklaus Giger
5940b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5950b2f4ecaSNiklaus Giger
5960b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5970b2f4ecaSNiklaus Giger		the defaults discussed just above.
5980b2f4ecaSNiklaus Giger
5992c451f78SAneesh V- Cache Configuration:
6002c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
6012c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
6022c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
6032c451f78SAneesh V
60493bc2193SAneesh V- Cache Configuration for ARM:
60593bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
60693bc2193SAneesh V				      controller
60793bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
60893bc2193SAneesh V					controller register space
60993bc2193SAneesh V
6106705d81eSwdenk- Serial Ports:
61148d0192fSAndreas Engel		CONFIG_PL010_SERIAL
6126705d81eSwdenk
6136705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
6146705d81eSwdenk
61548d0192fSAndreas Engel		CONFIG_PL011_SERIAL
6166705d81eSwdenk
6176705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
6186705d81eSwdenk
6196705d81eSwdenk		CONFIG_PL011_CLOCK
6206705d81eSwdenk
6216705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
6226705d81eSwdenk		the clock speed of the UARTs.
6236705d81eSwdenk
6246705d81eSwdenk		CONFIG_PL01x_PORTS
6256705d81eSwdenk
6266705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
6276705d81eSwdenk		define this to a list of base addresses for each (supported)
6286705d81eSwdenk		port. See e.g. include/configs/versatile.h
6296705d81eSwdenk
630910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
631910f1ae3SJohn Rigby
632910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
633910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
634910f1ae3SJohn Rigby		this variable to initialize the extra register.
635910f1ae3SJohn Rigby
636910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
637910f1ae3SJohn Rigby
638910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
639910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
640910f1ae3SJohn Rigby		variable to flush the UART at init time.
641910f1ae3SJohn Rigby
6426705d81eSwdenk
643c609719bSwdenk- Console Interface:
644c609719bSwdenk		Depending on board, define exactly one serial port
645c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
646c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
647c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
648c609719bSwdenk
649c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
650c609719bSwdenk		port routines must be defined elsewhere
651c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
652c609719bSwdenk
653c609719bSwdenk		CONFIG_CFB_CONSOLE
654c609719bSwdenk		Enables console device for a color framebuffer. Needs following
655c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
656c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
657c609719bSwdenk						(default big endian)
658c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
659c609719bSwdenk						rectangle fill
660c609719bSwdenk						(cf. smiLynxEM)
661c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
662c609719bSwdenk						bit-blit (cf. smiLynxEM)
663c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
664c609719bSwdenk						(cols=pitch)
665c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
666c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
667c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
668c609719bSwdenk						(0-5, cf. cfb_console.c)
669c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
670c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
671c609719bSwdenk						(i.e. i8042_kbd_init())
672c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
673c609719bSwdenk						(i.e. i8042_tstc)
674c609719bSwdenk			VIDEO_GETC_FCT		get char fct
675c609719bSwdenk						(i.e. i8042_getc)
676c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
677c609719bSwdenk						(requires blink timer
678c609719bSwdenk						cf. i8042.c)
6796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
680c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
681c609719bSwdenk						upper right corner
682602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
683c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
684c609719bSwdenk						upper left corner
685a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
686a6c7ad2fSwdenk						linux_logo.h for logo.
687a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
688c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
68911ccc33fSMarcel Ziswiler						additional board info beside
690c609719bSwdenk						the logo
691c609719bSwdenk
69233a35bbbSPali Rohár		When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
69333a35bbbSPali Rohár		a limited number of ANSI escape sequences (cursor control,
69433a35bbbSPali Rohár		erase functions and limited graphics rendition control).
69533a35bbbSPali Rohár
696c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
697c609719bSwdenk		default i/o. Serial console can be forced with
698c609719bSwdenk		environment 'console=serial'.
699c609719bSwdenk
700a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
701a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
702a3ad8e26Swdenk		the "silent" environment variable. See
703a3ad8e26Swdenk		doc/README.silent for more information.
704a3ad8e26Swdenk
705c609719bSwdenk- Console Baudrate:
706c609719bSwdenk		CONFIG_BAUDRATE - in bps
707c609719bSwdenk		Select one of the baudrates listed in
7086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
7096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
710c609719bSwdenk
711c92fac91SHeiko Schocher- Console Rx buffer length
712c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
713c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
7142b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
715c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
716c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
717c92fac91SHeiko Schocher		the SMC.
718c92fac91SHeiko Schocher
7199558b48aSGraeme Russ- Pre-Console Buffer:
7209558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
7219558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
7229558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
7239558b48aSGraeme Russ		buffer any console messages prior to the console being
7249558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
7259558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
7269558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
7279558b48aSGraeme Russ		bytes are output before the console is initialised, the
7289558b48aSGraeme Russ		earlier bytes are discarded.
7299558b48aSGraeme Russ
7309558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
7319558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
7329558b48aSGraeme Russ
733046a37bdSSonny Rao- Safe printf() functions
734046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
735046a37bdSSonny Rao		the printf() functions. These are defined in
736046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
737046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
738046a37bdSSonny Rao		If this option is not given then these functions will
739046a37bdSSonny Rao		silently discard their buffer size argument - this means
740046a37bdSSonny Rao		you are not getting any overflow checking in this case.
741046a37bdSSonny Rao
742c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
743c609719bSwdenk		Delay before automatically booting the default image;
744c609719bSwdenk		set to -1 to disable autoboot.
74593d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
74693d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
747c609719bSwdenk
748c609719bSwdenk		See doc/README.autoboot for these options that
749c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
750c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
751c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
752c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
753c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
754c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
755c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
756c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
757c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
758c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
759c609719bSwdenk		CONFIG_RESET_TO_RETRY
760c609719bSwdenk
761c609719bSwdenk- Autoboot Command:
762c609719bSwdenk		CONFIG_BOOTCOMMAND
763c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
764c609719bSwdenk		define a command string that is automatically executed
765c609719bSwdenk		when no character is read on the console interface
766c609719bSwdenk		within "Boot Delay" after reset.
767c609719bSwdenk
768c609719bSwdenk		CONFIG_BOOTARGS
769c609719bSwdenk		This can be used to pass arguments to the bootm
770c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
771c609719bSwdenk		environment value "bootargs".
772c609719bSwdenk
773c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
774c609719bSwdenk		The value of these goes into the environment as
775c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
776c609719bSwdenk		as a convenience, when switching between booting from
77711ccc33fSMarcel Ziswiler		RAM and NFS.
778c609719bSwdenk
779c609719bSwdenk- Pre-Boot Commands:
780c609719bSwdenk		CONFIG_PREBOOT
781c609719bSwdenk
782c609719bSwdenk		When this option is #defined, the existence of the
783c609719bSwdenk		environment variable "preboot" will be checked
784c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
785c609719bSwdenk		countdown and/or running the auto-boot command resp.
786c609719bSwdenk		entering interactive mode.
787c609719bSwdenk
788c609719bSwdenk		This feature is especially useful when "preboot" is
789c609719bSwdenk		automatically generated or modified. For an example
790c609719bSwdenk		see the LWMON board specific code: here "preboot" is
791c609719bSwdenk		modified when the user holds down a certain
792c609719bSwdenk		combination of keys on the (special) keyboard when
793c609719bSwdenk		booting the systems
794c609719bSwdenk
795c609719bSwdenk- Serial Download Echo Mode:
796c609719bSwdenk		CONFIG_LOADS_ECHO
797c609719bSwdenk		If defined to 1, all characters received during a
798c609719bSwdenk		serial download (using the "loads" command) are
799c609719bSwdenk		echoed back. This might be needed by some terminal
800c609719bSwdenk		emulations (like "cu"), but may as well just take
801c609719bSwdenk		time on others. This setting #define's the initial
802c609719bSwdenk		value of the "loads_echo" environment variable.
803c609719bSwdenk
804602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
805c609719bSwdenk		CONFIG_KGDB_BAUDRATE
806c609719bSwdenk		Select one of the baudrates listed in
8076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
808c609719bSwdenk
809c609719bSwdenk- Monitor Functions:
810602ad3b3SJon Loeliger		Monitor commands can be included or excluded
811602ad3b3SJon Loeliger		from the build by using the #include files
812c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
813c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
814602ad3b3SJon Loeliger		and augmenting with additional #define's
815602ad3b3SJon Loeliger		for wanted commands.
816c609719bSwdenk
817602ad3b3SJon Loeliger		The default command configuration includes all commands
818602ad3b3SJon Loeliger		except those marked below with a "*".
819602ad3b3SJon Loeliger
820602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
821602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
822602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
823602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
824602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
825602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
826602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
827602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
828710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
829602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
830602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
831602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
832a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
833a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
834a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
835a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
836602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
837602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
838246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
839602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
840602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
8415e2b3e0cSJoe Hershberger		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
842fffad71bSJoe Hershberger		CONFIG_CMD_ENV_FLAGS	* display details about env flags
8430c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
84403e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
84503e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
846bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
847602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
84803e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
849602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
850602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
851602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
8524d98b5c8SVincent Stehlé		CONFIG_CMD_FUSE		* Device fuse support
85353fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
854a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
855a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
856bf36c5d5SSimon Glass		CONFIG_CMD_HASH		* calculate hash / digest
857602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
858602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
859602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
860602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
8618fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS		  List all images found in NOR flash
8624d98b5c8SVincent Stehlé		CONFIG_CMD_IMLS_NAND	* List all images found in NAND flash
863602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
8640c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
865c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
866602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
867602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
868602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
869602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
8704d98b5c8SVincent Stehlé		CONFIG_CMD_LDRINFO	* ldrinfo (display Blackfin loader)
871d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
872d22c338eSJoe Hershberger					  (169.254.*.*)
873602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
874602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
8754d98b5c8SVincent Stehlé		CONFIG_CMD_MD5SUM	* print md5 message digest
87602c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
87715a33e49SSimon Glass		CONFIG_CMD_MEMINFO	* Display detailed memory information
878602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
879a2681707SWolfgang Denk					  loop, loopw
8804d98b5c8SVincent Stehlé		CONFIG_CMD_MEMTEST	* mtest
881602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
882602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
883602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
88468d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
885602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
886602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
8874d98b5c8SVincent Stehlé		CONFIG_CMD_NFS		  NFS support
888e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
889e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
890602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
891602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
892602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
893602ad3b3SJon Loeliger					  host
894602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
895ff048ea9SKenneth Waters		CONFIG_CMD_READ		* Read raw data from partition
896602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
897602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
898d304931fSSimon Glass		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
899602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
900602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
901602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
902602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
903602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
904602ad3b3SJon Loeliger					  (4xx only)
905f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
9064d98b5c8SVincent Stehlé		CONFIG_CMD_SHA1SUM	* print sha1 memory digest
90702c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
9087d861d95SBob Liu		CONFIG_CMD_SOFTSWITCH	* Soft switch setting command for BF60x
90974de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
910602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
9117a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
9121fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
913da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
914da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
915602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
916602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
917c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
9184d98b5c8SVincent Stehlé		CONFIG_CMD_XIMG		  Load part of Multi Image
919c609719bSwdenk
920c609719bSwdenk
921c609719bSwdenk		EXAMPLE: If you want all functions except of network
922c609719bSwdenk		support you can write:
923c609719bSwdenk
924602ad3b3SJon Loeliger		#include "config_cmd_all.h"
925602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
926c609719bSwdenk
927213bf8c8SGerald Van Baren	Other Commands:
928213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
929c609719bSwdenk
930c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
931602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
932c609719bSwdenk		what you (and your U-Boot users) are doing. Data
933c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
934c609719bSwdenk		8260 (where accesses to the IMMR region must be
935c609719bSwdenk		uncached), and it cannot be disabled on all other
936c609719bSwdenk		systems where we (mis-) use the data cache to hold an
937c609719bSwdenk		initial stack and some data.
938c609719bSwdenk
939c609719bSwdenk
940c609719bSwdenk		XXX - this list needs to get updated!
941c609719bSwdenk
942a5ecbe62SWolfgang Denk- Regular expression support:
943a5ecbe62SWolfgang Denk		CONFIG_REGEX
944a5ecbe62SWolfgang Denk                If this variable is defined, U-Boot is linked against
945a5ecbe62SWolfgang Denk                the SLRE (Super Light Regular Expression) library,
946a5ecbe62SWolfgang Denk                which adds regex support to some commands, as for
947a5ecbe62SWolfgang Denk                example "env grep" and "setexpr".
948a5ecbe62SWolfgang Denk
94945ba8077SSimon Glass- Device tree:
95045ba8077SSimon Glass		CONFIG_OF_CONTROL
95145ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
95245ba8077SSimon Glass		to configure its devices, instead of relying on statically
95345ba8077SSimon Glass		compiled #defines in the board file. This option is
95445ba8077SSimon Glass		experimental and only available on a few boards. The device
95545ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
95645ba8077SSimon Glass
9572c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
9582c0f79e4SSimon Glass		be done using one of the two options below:
959bbb0b128SSimon Glass
960bbb0b128SSimon Glass		CONFIG_OF_EMBED
961bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
962bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
963bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
964bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
965bbb0b128SSimon Glass		the global data structure as gd->blob.
96645ba8077SSimon Glass
9672c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
9682c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
9692c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
9702c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
9712c0f79e4SSimon Glass
9722c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
9732c0f79e4SSimon Glass
9742c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
9752c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
9762c0f79e4SSimon Glass		still use the individual files if you need something more
9772c0f79e4SSimon Glass		exotic.
9782c0f79e4SSimon Glass
979c609719bSwdenk- Watchdog:
980c609719bSwdenk		CONFIG_WATCHDOG
981c609719bSwdenk		If this variable is defined, it enables watchdog
9826abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
9836abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
9846abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
9856abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
9866abe6fb6SDetlev Zundel		available, then no further board specific code should
9876abe6fb6SDetlev Zundel		be needed to use it.
9886abe6fb6SDetlev Zundel
9896abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
9906abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
9916abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
9926abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
993c609719bSwdenk
994c1551ea8Sstroese- U-Boot Version:
995c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
996c1551ea8Sstroese		If this variable is defined, an environment variable
997c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
998c1551ea8Sstroese		version as printed by the "version" command.
999a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
1000a1ea8e51SBenoît Thébaudeau		next reset.
1001c1551ea8Sstroese
1002c609719bSwdenk- Real-Time Clock:
1003c609719bSwdenk
1004602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
1005c609719bSwdenk		has to be selected, too. Define exactly one of the
1006c609719bSwdenk		following options:
1007c609719bSwdenk
1008c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
1009c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
10104e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
1011c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
10121cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
1013c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
10147f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
10153bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
10169536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
10174c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
10186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
101971d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
102071d19f30SHeiko Schocher					  RV3029 RTC.
1021c609719bSwdenk
1022b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
1023b37c7e5eSwdenk		must also be configured. See I2C Support, below.
1024b37c7e5eSwdenk
1025e92739d3SPeter Tyser- GPIO Support:
1026e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
1027e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
1028e92739d3SPeter Tyser
10295dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
10305dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
10315dec49caSChris Packham		pins supported by a particular chip.
10325dec49caSChris Packham
1033e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
1034e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
1035e92739d3SPeter Tyser
1036c609719bSwdenk- Timestamp Support:
1037c609719bSwdenk
1038c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
1039c609719bSwdenk		(date and time) of an image is printed by image
1040c609719bSwdenk		commands like bootm or iminfo. This option is
1041602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1042c609719bSwdenk
1043923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1044923c46f9SKarl O. Pinc		Zero or more of the following:
1045923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1046923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1047923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1048923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1049923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1050923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1051923c46f9SKarl O. Pinc				       disk/part_efi.c
1052923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1053c609719bSwdenk
1054602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1055218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1056923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1057c609719bSwdenk
1058c609719bSwdenk- IDE Reset method:
10594d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
10604d13cbadSwdenk		board configurations files but used nowhere!
1061c609719bSwdenk
10624d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
10634d13cbadSwdenk		be performed by calling the function
10644d13cbadSwdenk			ide_set_reset(int reset)
10654d13cbadSwdenk		which has to be defined in a board specific file
1066c609719bSwdenk
1067c609719bSwdenk- ATAPI Support:
1068c609719bSwdenk		CONFIG_ATAPI
1069c609719bSwdenk
1070c609719bSwdenk		Set this to enable ATAPI support.
1071c609719bSwdenk
1072c40b2956Swdenk- LBA48 Support
1073c40b2956Swdenk		CONFIG_LBA48
1074c40b2956Swdenk
1075c40b2956Swdenk		Set this to enable support for disks larger than 137GB
10764b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1077c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1078c40b2956Swdenk		support disks up to 2.1TB.
1079c40b2956Swdenk
10806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1081c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1082c40b2956Swdenk			Default is 32bit.
1083c40b2956Swdenk
1084c609719bSwdenk- SCSI Support:
1085c609719bSwdenk		At the moment only there is only support for the
1086c609719bSwdenk		SYM53C8XX SCSI controller; define
1087c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1088c609719bSwdenk
10896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
10906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
10916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1092c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1093c609719bSwdenk		devices.
10946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1095c609719bSwdenk
1096447c031bSStefan Reinauer                The environment variable 'scsidevs' is set to the number of
1097447c031bSStefan Reinauer                SCSI devices found during the last scan.
1098447c031bSStefan Reinauer
1099c609719bSwdenk- NETWORK Support (PCI):
1100682011ffSwdenk		CONFIG_E1000
1101ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1102ce5207e1SKyle Moffett
1103ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1104ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1105ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1106ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1107ce5207e1SKyle Moffett
1108ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1109ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1110ce5207e1SKyle Moffett		example with the "sspi" command.
1111ce5207e1SKyle Moffett
1112ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1113ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1114ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1115682011ffSwdenk
1116ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
111711ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1118ac3315c2SAndre Schwarz
1119c609719bSwdenk		CONFIG_EEPRO100
1120c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
112111ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1122c609719bSwdenk		write routine for first time initialisation.
1123c609719bSwdenk
1124c609719bSwdenk		CONFIG_TULIP
1125c609719bSwdenk		Support for Digital 2114x chips.
1126c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1127c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1128c609719bSwdenk
1129c609719bSwdenk		CONFIG_NATSEMI
1130c609719bSwdenk		Support for National dp83815 chips.
1131c609719bSwdenk
1132c609719bSwdenk		CONFIG_NS8382X
1133c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1134c609719bSwdenk
113545219c46Swdenk- NETWORK Support (other):
113645219c46Swdenk
1137c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1138c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1139c041e9d2SJens Scharsig
1140c041e9d2SJens Scharsig			CONFIG_RMII
1141c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1142c041e9d2SJens Scharsig
1143c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1144c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1145c041e9d2SJens Scharsig			The driver doen't show link status messages.
1146c041e9d2SJens Scharsig
1147efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1148efdd7319SRob Herring		Support for the Calxeda XGMAC device
1149efdd7319SRob Herring
11503bb46d23SAshok		CONFIG_LAN91C96
115145219c46Swdenk		Support for SMSC's LAN91C96 chips.
115245219c46Swdenk
115345219c46Swdenk			CONFIG_LAN91C96_BASE
115445219c46Swdenk			Define this to hold the physical address
115545219c46Swdenk			of the LAN91C96's I/O space
115645219c46Swdenk
115745219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
115845219c46Swdenk			Define this to enable 32 bit addressing
115945219c46Swdenk
11603bb46d23SAshok		CONFIG_SMC91111
1161f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1162f39748aeSwdenk
1163f39748aeSwdenk			CONFIG_SMC91111_BASE
1164f39748aeSwdenk			Define this to hold the physical address
1165f39748aeSwdenk			of the device (I/O space)
1166f39748aeSwdenk
1167f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1168f39748aeSwdenk			Define this if data bus is 32 bits
1169f39748aeSwdenk
1170f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1171f39748aeSwdenk			Define this to use i/o functions instead of macros
1172f39748aeSwdenk			(some hardware wont work with macros)
1173f39748aeSwdenk
1174dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1175dc02badaSHeiko Schocher		Support for davinci emac
1176dc02badaSHeiko Schocher
1177dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1178dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1179dc02badaSHeiko Schocher
1180b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1181b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1182b3dbf4a5SMacpaul Lin
1183b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1184b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1185b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1186b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1187b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1188b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1189b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1190b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1191b3dbf4a5SMacpaul Lin
1192c2fff331SMike Rapoport		CONFIG_SMC911X
1193557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1194557b377dSJens Gehrlein
1195c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1196557b377dSJens Gehrlein			Define this to hold the physical address
1197557b377dSJens Gehrlein			of the device (I/O space)
1198557b377dSJens Gehrlein
1199c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1200557b377dSJens Gehrlein			Define this if data bus is 32 bits
1201557b377dSJens Gehrlein
1202c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1203557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1204557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1205c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1206557b377dSJens Gehrlein
12073d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
12083d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
12093d0075faSYoshihiro Shimoda
12103d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
12113d0075faSYoshihiro Shimoda			Define the number of ports to be used
12123d0075faSYoshihiro Shimoda
12133d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
12143d0075faSYoshihiro Shimoda			Define the ETH PHY's address
12153d0075faSYoshihiro Shimoda
121668260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
121768260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
121868260aabSYoshihiro Shimoda
12195e124724SVadim Bendebury- TPM Support:
122090899cc0SChe-liang Chiou		CONFIG_TPM
122190899cc0SChe-liang Chiou		Support TPM devices.
122290899cc0SChe-liang Chiou
12231b393db5STom Wai-Hong Tam		CONFIG_TPM_TIS_I2C
12241b393db5STom Wai-Hong Tam		Support for i2c bus TPM devices. Only one device
12251b393db5STom Wai-Hong Tam		per system is supported at this time.
12261b393db5STom Wai-Hong Tam
12271b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BUS_NUMBER
12281b393db5STom Wai-Hong Tam			Define the the i2c bus number for the TPM device
12291b393db5STom Wai-Hong Tam
12301b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
12311b393db5STom Wai-Hong Tam			Define the TPM's address on the i2c bus
12321b393db5STom Wai-Hong Tam
12331b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BURST_LIMITATION
12341b393db5STom Wai-Hong Tam			Define the burst count bytes upper limit
12351b393db5STom Wai-Hong Tam
1236c01939c7SDirk Eibach		CONFIG_TPM_ATMEL_TWI
1237c01939c7SDirk Eibach		Support for Atmel TWI TPM device. Requires I2C support.
1238c01939c7SDirk Eibach
123990899cc0SChe-liang Chiou		CONFIG_TPM_TIS_LPC
12405e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
12415e124724SVadim Bendebury		per system is supported at this time.
12425e124724SVadim Bendebury
12435e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
12445e124724SVadim Bendebury			Base address where the generic TPM device is mapped
12455e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
12465e124724SVadim Bendebury			0xfed40000.
12475e124724SVadim Bendebury
1248be6c1529SReinhard Pfau		CONFIG_CMD_TPM
1249be6c1529SReinhard Pfau		Add tpm monitor functions.
1250be6c1529SReinhard Pfau		Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
1251be6c1529SReinhard Pfau		provides monitor access to authorized functions.
1252be6c1529SReinhard Pfau
1253be6c1529SReinhard Pfau		CONFIG_TPM
1254be6c1529SReinhard Pfau		Define this to enable the TPM support library which provides
1255be6c1529SReinhard Pfau		functional interfaces to some TPM commands.
1256be6c1529SReinhard Pfau		Requires support for a TPM device.
1257be6c1529SReinhard Pfau
1258be6c1529SReinhard Pfau		CONFIG_TPM_AUTH_SESSIONS
1259be6c1529SReinhard Pfau		Define this to enable authorized functions in the TPM library.
1260be6c1529SReinhard Pfau		Requires CONFIG_TPM and CONFIG_SHA1.
1261be6c1529SReinhard Pfau
1262c609719bSwdenk- USB Support:
1263c609719bSwdenk		At the moment only the UHCI host controller is
12644d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1265c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1266c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
126730d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1268c609719bSwdenk		storage devices.
1269c609719bSwdenk		Note:
1270c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1271c609719bSwdenk		(TEAC FD-05PUB).
12724d13cbadSwdenk		MPC5200 USB requires additional defines:
12734d13cbadSwdenk			CONFIG_USB_CLOCK
12744d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1275307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1276307ecb6dSEric Millbrandt				for USB on PSC3
12774d13cbadSwdenk			CONFIG_USB_CONFIG
12784d13cbadSwdenk				for differential drivers: 0x00001000
12794d13cbadSwdenk				for single ended drivers: 0x00005000
1280307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1281307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
12826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1283fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1284fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
12854d13cbadSwdenk
12869ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
12879ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
12889ab4ce22SSimon Glass
1289aa155058SKuo-Jung Su		CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
1290aa155058SKuo-Jung Su		interval for usb hub power-on delay.(minimum 100msec)
1291aa155058SKuo-Jung Su
129216c8d5e7SWolfgang Denk- USB Device:
129316c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
129416c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
129516c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
129611ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
129716c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
129816c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
129916c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
130016c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
130116c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
130216c8d5e7SWolfgang Denk		a Linux host by
130316c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
130416c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
130516c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
130616c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
130716c8d5e7SWolfgang Denk
130816c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
130916c8d5e7SWolfgang Denk			Define this to build a UDC device
131016c8d5e7SWolfgang Denk
131116c8d5e7SWolfgang Denk			CONFIG_USB_TTY
131216c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
131316c8d5e7SWolfgang Denk			talk to the UDC device
131416c8d5e7SWolfgang Denk
1315f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1316f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1317f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1318f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1319f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1320f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1321f9da0f89SVipin KUMAR			speed.
1322f9da0f89SVipin KUMAR
13236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
132416c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
132516c8d5e7SWolfgang Denk			be set to usbtty.
132616c8d5e7SWolfgang Denk
132716c8d5e7SWolfgang Denk			mpc8xx:
13286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
132916c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
13306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
133116c8d5e7SWolfgang Denk
13326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
133316c8d5e7SWolfgang Denk				Derive USB clock from brgclk
13346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
133516c8d5e7SWolfgang Denk
133616c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
133716c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
133816c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
133916c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
134016c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
134116c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
134216c8d5e7SWolfgang Denk
134316c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
134416c8d5e7SWolfgang Denk			Define this string as the name of your company for
134516c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
134616c8d5e7SWolfgang Denk
134716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
134816c8d5e7SWolfgang Denk			Define this string as the name of your product
134916c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
135016c8d5e7SWolfgang Denk
135116c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
135216c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
135316c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
135416c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
135516c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
135616c8d5e7SWolfgang Denk
135716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
135816c8d5e7SWolfgang Denk			Define this as the unique Product ID
135916c8d5e7SWolfgang Denk			for your device
136016c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1361c609719bSwdenk
1362d70a560fSIgor Grinberg- ULPI Layer Support:
1363d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1364d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1365d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1366d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1367d70a560fSIgor Grinberg		viewport is supported.
1368d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1369d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
13706d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
13716d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
13726d365ea0SLucas Stach		the appropriate value in Hz.
1373c609719bSwdenk
1374c609719bSwdenk- MMC Support:
1375c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1376c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1377c609719bSwdenk		accessed from the boot prompt by mapping the device
1378c609719bSwdenk		to physical memory similar to flash. Command line is
1379602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1380602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1381c609719bSwdenk
1382afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1383afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1384afb35666SYoshihiro Shimoda
1385afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1386afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1387afb35666SYoshihiro Shimoda
1388afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1389afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1390afb35666SYoshihiro Shimoda
1391b3ba6e94STom Rini- USB Device Firmware Update (DFU) class support:
1392b3ba6e94STom Rini		CONFIG_DFU_FUNCTION
1393b3ba6e94STom Rini		This enables the USB portion of the DFU USB class
1394b3ba6e94STom Rini
1395b3ba6e94STom Rini		CONFIG_CMD_DFU
1396b3ba6e94STom Rini		This enables the command "dfu" which is used to have
1397b3ba6e94STom Rini		U-Boot create a DFU class device via USB.  This command
1398b3ba6e94STom Rini		requires that the "dfu_alt_info" environment variable be
1399b3ba6e94STom Rini		set and define the alt settings to expose to the host.
1400b3ba6e94STom Rini
1401b3ba6e94STom Rini		CONFIG_DFU_MMC
1402b3ba6e94STom Rini		This enables support for exposing (e)MMC devices via DFU.
1403b3ba6e94STom Rini
1404c6631764SPantelis Antoniou		CONFIG_DFU_NAND
1405c6631764SPantelis Antoniou		This enables support for exposing NAND devices via DFU.
1406c6631764SPantelis Antoniou
1407e7e75c70SHeiko Schocher		CONFIG_SYS_DFU_DATA_BUF_SIZE
1408e7e75c70SHeiko Schocher		Dfu transfer uses a buffer before writing data to the
1409e7e75c70SHeiko Schocher		raw storage device. Make the size (in bytes) of this buffer
1410e7e75c70SHeiko Schocher		configurable. The size of this buffer is also configurable
1411e7e75c70SHeiko Schocher		through the "dfu_bufsiz" environment variable.
1412e7e75c70SHeiko Schocher
1413ea2453d5SPantelis Antoniou		CONFIG_SYS_DFU_MAX_FILE_SIZE
1414ea2453d5SPantelis Antoniou		When updating files rather than the raw storage device,
1415ea2453d5SPantelis Antoniou		we use a static buffer to copy the file into and then write
1416ea2453d5SPantelis Antoniou		the buffer once we've been given the whole file.  Define
1417ea2453d5SPantelis Antoniou		this to the maximum filesize (in bytes) for the buffer.
1418ea2453d5SPantelis Antoniou		Default is 4 MiB if undefined.
1419ea2453d5SPantelis Antoniou
14206705d81eSwdenk- Journaling Flash filesystem support:
14216705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
14226705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
14236705d81eSwdenk		Define these for a default partition on a NAND device
14246705d81eSwdenk
14256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
14266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
14276705d81eSwdenk		Define these for a default partition on a NOR device
14286705d81eSwdenk
14296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
14306705d81eSwdenk		Define this to create an own partition. You have to provide a
14316705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
14326705d81eSwdenk
14336705d81eSwdenk		If you define only one JFFS2 partition you may also want to
14346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
14356705d81eSwdenk		to disable the command chpart. This is the default when you
14366705d81eSwdenk		have not defined a custom partition
14376705d81eSwdenk
1438c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1439c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1440656f4c65SDonggeun Kim
1441656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1442656f4c65SDonggeun Kim		file in FAT formatted partition.
1443656f4c65SDonggeun Kim
1444656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1445656f4c65SDonggeun Kim		user to write files to FAT.
1446c30a15e5SDonggeun Kim
144784cd9327SGabe BlackCBFS (Coreboot Filesystem) support
144884cd9327SGabe Black		CONFIG_CMD_CBFS
144984cd9327SGabe Black
145084cd9327SGabe Black		Define this to enable support for reading from a Coreboot
145184cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
145284cd9327SGabe Black		and cbfsload.
145384cd9327SGabe Black
1454c609719bSwdenk- Keyboard Support:
1455c609719bSwdenk		CONFIG_ISA_KEYBOARD
1456c609719bSwdenk
1457c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1458c609719bSwdenk		support
1459c609719bSwdenk
1460c609719bSwdenk		CONFIG_I8042_KBD
1461c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1462c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1463c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1464c609719bSwdenk		for cfb_console. Supports cursor blinking.
1465c609719bSwdenk
1466713cb680SHung-ying Tyan		CONFIG_CROS_EC_KEYB
1467713cb680SHung-ying Tyan		Enables a Chrome OS keyboard using the CROS_EC interface.
1468713cb680SHung-ying Tyan		This uses CROS_EC to communicate with a second microcontroller
1469713cb680SHung-ying Tyan		which provides key scans on request.
1470713cb680SHung-ying Tyan
1471c609719bSwdenk- Video support:
1472c609719bSwdenk		CONFIG_VIDEO
1473c609719bSwdenk
1474c609719bSwdenk		Define this to enable video support (for output to
1475c609719bSwdenk		video).
1476c609719bSwdenk
1477c609719bSwdenk		CONFIG_VIDEO_CT69000
1478c609719bSwdenk
1479c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1480c609719bSwdenk
1481c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1482eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1483eeb1b77bSwdenk		video output is selected via environment 'videoout'
1484eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1485eeb1b77bSwdenk		assumed.
1486c609719bSwdenk
1487eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
148811ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1489eeb1b77bSwdenk		are possible:
1490eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1491eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1492eeb1b77bSwdenk
1493eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1494eeb1b77bSwdenk		-------------+---------------------------------------------
1495eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1496eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1497eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1498eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1499eeb1b77bSwdenk		-------------+---------------------------------------------
1500c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1501c609719bSwdenk
1502eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
15037817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1504eeb1b77bSwdenk
1505eeb1b77bSwdenk
1506a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1507a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1508a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1509a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1510a6c7ad2fSwdenk
15117d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
15127d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
15137d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
15147d3053fbSTimur Tabi		support, and should also define these other macros:
15157d3053fbSTimur Tabi
15167d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
15177d3053fbSTimur Tabi			CONFIG_VIDEO
15187d3053fbSTimur Tabi			CONFIG_CMD_BMP
15197d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
15207d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
15217d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
15227d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
15237d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
15247d3053fbSTimur Tabi
1525ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1526ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1527ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1528ba8e76bdSTimur Tabi		description of this variable.
15297d3053fbSTimur Tabi
1530058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1531058d59b0SSimon Glass
1532058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1533058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1534058d59b0SSimon Glass		driver.
1535058d59b0SSimon Glass
1536058d59b0SSimon Glass
1537682011ffSwdenk- Keyboard Support:
1538682011ffSwdenk		CONFIG_KEYBOARD
1539682011ffSwdenk
1540682011ffSwdenk		Define this to enable a custom keyboard support.
1541682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1542682011ffSwdenk		defined in your board-specific files.
1543682011ffSwdenk		The only board using this so far is RBC823.
1544a6c7ad2fSwdenk
1545c609719bSwdenk- LCD Support:	CONFIG_LCD
1546c609719bSwdenk
1547c609719bSwdenk		Define this to enable LCD support (for output to LCD
1548c609719bSwdenk		display); also select one of the supported displays
1549c609719bSwdenk		by defining one of these:
1550c609719bSwdenk
155139cf4804SStelian Pop		CONFIG_ATMEL_LCD:
155239cf4804SStelian Pop
155339cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
155439cf4804SStelian Pop
1555fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1556c609719bSwdenk
1557fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1558c609719bSwdenk
1559fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1560c609719bSwdenk
1561fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1562fd3103bbSwdenk			Active, color, single scan.
1563fd3103bbSwdenk
1564fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1565fd3103bbSwdenk
1566fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1567c609719bSwdenk			Active, color, single scan.
1568c609719bSwdenk
1569c609719bSwdenk		CONFIG_SHARP_16x9
1570c609719bSwdenk
1571c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1572c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1573c609719bSwdenk
1574c609719bSwdenk		CONFIG_SHARP_LQ64D341
1575c609719bSwdenk
1576c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1577c609719bSwdenk			Active, color, single scan.
1578c609719bSwdenk
1579c609719bSwdenk		CONFIG_HLD1045
1580c609719bSwdenk
1581c609719bSwdenk			HLD1045 display, 640x480.
1582c609719bSwdenk			Active, color, single scan.
1583c609719bSwdenk
1584c609719bSwdenk		CONFIG_OPTREX_BW
1585c609719bSwdenk
1586c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1587c609719bSwdenk			or
1588c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1589c609719bSwdenk			or
1590c609719bSwdenk			Hitachi	 SP14Q002
1591c609719bSwdenk
1592c609719bSwdenk			320x240. Black & white.
1593c609719bSwdenk
1594c609719bSwdenk		Normally display is black on white background; define
15956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1596c609719bSwdenk
1597676d319eSSimon Glass		CONFIG_LCD_ALIGNMENT
1598676d319eSSimon Glass
1599676d319eSSimon Glass		Normally the LCD is page-aligned (tyically 4KB). If this is
1600676d319eSSimon Glass		defined then the LCD will be aligned to this value instead.
1601676d319eSSimon Glass		For ARM it is sometimes useful to use MMU_SECTION_SIZE
1602676d319eSSimon Glass		here, since it is cheaper to change data cache settings on
1603676d319eSSimon Glass		a per-section basis.
1604676d319eSSimon Glass
16050d89efefSSimon Glass		CONFIG_CONSOLE_SCROLL_LINES
16060d89efefSSimon Glass
16070d89efefSSimon Glass		When the console need to be scrolled, this is the number of
16080d89efefSSimon Glass		lines to scroll by. It defaults to 1. Increasing this makes
16090d89efefSSimon Glass		the console jump but can help speed up operation when scrolling
16100d89efefSSimon Glass		is slow.
1611676d319eSSimon Glass
161245d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
161345d7f525STom Wai-Hong Tam
161445d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
161545d7f525STom Wai-Hong Tam
1616735987c5STom Wai-Hong Tam		CONFIG_I2C_EDID
1617735987c5STom Wai-Hong Tam
1618735987c5STom Wai-Hong Tam		Enables an 'i2c edid' command which can read EDID
1619735987c5STom Wai-Hong Tam		information over I2C from an attached LCD display.
1620735987c5STom Wai-Hong Tam
16217152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1622d791b1dcSwdenk
1623d791b1dcSwdenk		If this option is set, the environment is checked for
1624d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1625d791b1dcSwdenk		of logo, copyright and system information on the LCD
1626e94d2cd9Swdenk		is suppressed and the BMP image at the address
1627d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1628d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1629d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1630d791b1dcSwdenk		loaded very quickly after power-on.
1631d791b1dcSwdenk
1632c0880485SNikita Kiryanov		CONFIG_SPLASHIMAGE_GUARD
1633c0880485SNikita Kiryanov
1634c0880485SNikita Kiryanov		If this option is set, then U-Boot will prevent the environment
1635c0880485SNikita Kiryanov		variable "splashimage" from being set to a problematic address
1636c0880485SNikita Kiryanov		(see README.displaying-bmps and README.arm-unaligned-accesses).
1637c0880485SNikita Kiryanov		This option is useful for targets where, due to alignment
1638c0880485SNikita Kiryanov		restrictions, an improperly aligned BMP image will cause a data
1639c0880485SNikita Kiryanov		abort. If you think you will not have problems with unaligned
1640c0880485SNikita Kiryanov		accesses (for example because your toolchain prevents them)
1641c0880485SNikita Kiryanov		there is no need to set this option.
1642c0880485SNikita Kiryanov
16431ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
16441ca298ceSMatthias Weisser
16451ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
16461ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
16471ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
16481ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
16491ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
16501ca298ceSMatthias Weisser		specify 'm' for centering the image.
16511ca298ceSMatthias Weisser
16521ca298ceSMatthias Weisser		Example:
16531ca298ceSMatthias Weisser		setenv splashpos m,m
16541ca298ceSMatthias Weisser			=> image at center of screen
16551ca298ceSMatthias Weisser
16561ca298ceSMatthias Weisser		setenv splashpos 30,20
16571ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
16581ca298ceSMatthias Weisser
16591ca298ceSMatthias Weisser		setenv splashpos -10,m
16601ca298ceSMatthias Weisser			=> vertically centered image
16611ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
16621ca298ceSMatthias Weisser
166398f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
166498f4a3dfSStefan Roese
166598f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
166698f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
166798f4a3dfSStefan Roese		splashscreen support or the bmp command.
166898f4a3dfSStefan Roese
1669d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1670d5011762SAnatolij Gustschin
1671d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1672d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1673d5011762SAnatolij Gustschin		bmp command.
1674d5011762SAnatolij Gustschin
1675f2b96dfbSLei Wen- Do compresssing for memory range:
1676f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1677f2b96dfbSLei Wen
1678f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1679f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1680f2b96dfbSLei Wen
1681c29fdfc1Swdenk- Compression support:
16828ef70478SKees Cook		CONFIG_GZIP
16838ef70478SKees Cook
16848ef70478SKees Cook		Enabled by default to support gzip compressed images.
16858ef70478SKees Cook
1686c29fdfc1Swdenk		CONFIG_BZIP2
1687c29fdfc1Swdenk
1688c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1689c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1690c29fdfc1Swdenk		compressed images are supported.
1691c29fdfc1Swdenk
1692c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
16936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1694c29fdfc1Swdenk		be at least 4MB.
1695d791b1dcSwdenk
1696fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1697fc9c1727SLuigi 'Comio' Mantellini
1698fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1699fc9c1727SLuigi 'Comio' Mantellini		images is included.
1700fc9c1727SLuigi 'Comio' Mantellini
1701fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1702fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1703fc9c1727SLuigi 'Comio' Mantellini		formula:
1704fc9c1727SLuigi 'Comio' Mantellini
1705fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1706fc9c1727SLuigi 'Comio' Mantellini
1707fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1708fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1709fc9c1727SLuigi 'Comio' Mantellini
1710fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1711fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1712fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1713fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1714fc9c1727SLuigi 'Comio' Mantellini
1715fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1716fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
17176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1718fc9c1727SLuigi 'Comio' Mantellini
17198ef70478SKees Cook		CONFIG_LZO
17208ef70478SKees Cook
17218ef70478SKees Cook		If this option is set, support for LZO compressed images
17228ef70478SKees Cook		is included.
17238ef70478SKees Cook
172417ea1177Swdenk- MII/PHY support:
172517ea1177Swdenk		CONFIG_PHY_ADDR
172617ea1177Swdenk
172717ea1177Swdenk		The address of PHY on MII bus.
172817ea1177Swdenk
172917ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
173017ea1177Swdenk
173117ea1177Swdenk		The clock frequency of the MII bus
173217ea1177Swdenk
173317ea1177Swdenk		CONFIG_PHY_GIGE
173417ea1177Swdenk
173517ea1177Swdenk		If this option is set, support for speed/duplex
173611ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
173717ea1177Swdenk
173817ea1177Swdenk		CONFIG_PHY_RESET_DELAY
173917ea1177Swdenk
174017ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
174117ea1177Swdenk		reset before any MII register access is possible.
174217ea1177Swdenk		For such PHY, set this option to the usec delay
174317ea1177Swdenk		required. (minimum 300usec for LXT971A)
174417ea1177Swdenk
174517ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
174617ea1177Swdenk
174717ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
174817ea1177Swdenk		command issued before MII status register can be read
174917ea1177Swdenk
1750c609719bSwdenk- Ethernet address:
1751c609719bSwdenk		CONFIG_ETHADDR
1752c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1753c609719bSwdenk		CONFIG_ETH2ADDR
1754c609719bSwdenk		CONFIG_ETH3ADDR
1755c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1756c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1757c609719bSwdenk
175811ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
175911ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1760c609719bSwdenk		is not determined automatically.
1761c609719bSwdenk
1762c609719bSwdenk- IP address:
1763c609719bSwdenk		CONFIG_IPADDR
1764c609719bSwdenk
1765c609719bSwdenk		Define a default value for the IP address to use for
176611ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1767c609719bSwdenk		determined through e.g. bootp.
17681ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1769c609719bSwdenk
1770c609719bSwdenk- Server IP address:
1771c609719bSwdenk		CONFIG_SERVERIP
1772c609719bSwdenk
1773c609719bSwdenk		Defines a default value for the IP address of a TFTP
1774c609719bSwdenk		server to contact when using the "tftboot" command.
17751ebcd654SWolfgang Denk		(Environment variable "serverip")
1776c609719bSwdenk
177797cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
177897cfe861SRobin Getz
177997cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
178097cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
178197cfe861SRobin Getz
17821ebcd654SWolfgang Denk- Gateway IP address:
17831ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
17841ebcd654SWolfgang Denk
17851ebcd654SWolfgang Denk		Defines a default value for the IP address of the
17861ebcd654SWolfgang Denk		default router where packets to other networks are
17871ebcd654SWolfgang Denk		sent to.
17881ebcd654SWolfgang Denk		(Environment variable "gatewayip")
17891ebcd654SWolfgang Denk
17901ebcd654SWolfgang Denk- Subnet mask:
17911ebcd654SWolfgang Denk		CONFIG_NETMASK
17921ebcd654SWolfgang Denk
17931ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
17941ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
17951ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
17961ebcd654SWolfgang Denk		forwarded through a router.
17971ebcd654SWolfgang Denk		(Environment variable "netmask")
17981ebcd654SWolfgang Denk
179953a5c424SDavid Updegraff- Multicast TFTP Mode:
180053a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
180153a5c424SDavid Updegraff
180253a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
180353a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
180411ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
180553a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
180653a5c424SDavid Updegraff		multicast group.
180753a5c424SDavid Updegraff
1808c609719bSwdenk- BOOTP Recovery Mode:
1809c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1810c609719bSwdenk
1811c609719bSwdenk		If you have many targets in a network that try to
1812c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1813c609719bSwdenk		systems send out BOOTP requests at precisely the same
1814c609719bSwdenk		moment (which would happen for instance at recovery
1815c609719bSwdenk		from a power failure, when all systems will try to
1816c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1817c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1818c609719bSwdenk		inserted before sending out BOOTP requests. The
18196c33c785SWolfgang Denk		following delays are inserted then:
1820c609719bSwdenk
1821c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1822c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1823c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1824c609719bSwdenk		4th and following
1825c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1826c609719bSwdenk
1827fe389a82Sstroese- DHCP Advanced Options:
18281fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
18291fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1830fe389a82Sstroese
18311fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
18321fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
18331fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
18341fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
18351fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
18361fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
18371fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
18381fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
18391fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
18401fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
18411fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
18421fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
18432c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1844fe389a82Sstroese
18455d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
18465d110f0aSWilson Callan		environment variable, not the BOOTP server.
1847fe389a82Sstroese
18482c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
18492c00e099SJoe Hershberger		after the configured retry count, the call will fail
18502c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
18512c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
18522c00e099SJoe Hershberger		is not available.
18532c00e099SJoe Hershberger
1854fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1855fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1856fe389a82Sstroese		than one DNS serverip is offered to the client.
1857fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1858fe389a82Sstroese		serverip will be stored in the additional environment
1859fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1860fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
18611fe80d79SJon Loeliger		is defined.
1862fe389a82Sstroese
1863fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1864fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1865fe389a82Sstroese		need the hostname of the DHCP requester.
18665d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
18671fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
18681fe80d79SJon Loeliger		option 12 to the DHCP server.
1869fe389a82Sstroese
1870d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1871d9a2f416SAras Vaichas
1872d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1873d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1874d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1875d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1876d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1877d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1878d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1879d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1880d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1881d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1882d9a2f416SAras Vaichas		this delay.
1883d9a2f416SAras Vaichas
1884d22c338eSJoe Hershberger - Link-local IP address negotiation:
1885d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1886d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1887d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1888d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1889d22c338eSJoe Hershberger
1890d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1891d22c338eSJoe Hershberger
1892a3d991bdSwdenk - CDP Options:
1893a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1894a3d991bdSwdenk
1895a3d991bdSwdenk		The device id used in CDP trigger frames.
1896a3d991bdSwdenk
1897a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1898a3d991bdSwdenk
1899a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1900a3d991bdSwdenk		of the device.
1901a3d991bdSwdenk
1902a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1903a3d991bdSwdenk
1904a3d991bdSwdenk		A printf format string which contains the ascii name of
1905a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
190611ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1907a3d991bdSwdenk
1908a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1909a3d991bdSwdenk
1910a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1911a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1912a3d991bdSwdenk
1913a3d991bdSwdenk		CONFIG_CDP_VERSION
1914a3d991bdSwdenk
1915a3d991bdSwdenk		An ascii string containing the version of the software.
1916a3d991bdSwdenk
1917a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1918a3d991bdSwdenk
1919a3d991bdSwdenk		An ascii string containing the name of the platform.
1920a3d991bdSwdenk
1921a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1922a3d991bdSwdenk
1923a3d991bdSwdenk		A 32bit integer sent on the trigger.
1924a3d991bdSwdenk
1925a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1926a3d991bdSwdenk
1927a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1928a3d991bdSwdenk		device in .1 of milliwatts.
1929a3d991bdSwdenk
1930a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1931a3d991bdSwdenk
1932a3d991bdSwdenk		A byte containing the id of the VLAN.
1933a3d991bdSwdenk
1934c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1935c609719bSwdenk
1936c609719bSwdenk		Several configurations allow to display the current
1937c609719bSwdenk		status using a LED. For instance, the LED will blink
1938c609719bSwdenk		fast while running U-Boot code, stop blinking as
1939c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1940c609719bSwdenk		start blinking slow once the Linux kernel is running
1941c609719bSwdenk		(supported by a status LED driver in the Linux
1942c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1943c609719bSwdenk		feature in U-Boot.
1944c609719bSwdenk
1945c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1946c609719bSwdenk
1947c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1948c609719bSwdenk		on those systems that support this (optional)
1949c609719bSwdenk		feature, like the TQM8xxL modules.
1950c609719bSwdenk
19513f4978c7SHeiko Schocher- I2C Support:	CONFIG_SYS_I2C
1952c609719bSwdenk
19533f4978c7SHeiko Schocher		This enable the NEW i2c subsystem, and will allow you to use
19543f4978c7SHeiko Schocher		i2c commands at the u-boot command line (as long as you set
19553f4978c7SHeiko Schocher		CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
19563f4978c7SHeiko Schocher		based realtime clock chips or other i2c devices. See
19573f4978c7SHeiko Schocher		common/cmd_i2c.c for a description of the command line
19583f4978c7SHeiko Schocher		interface.
19593f4978c7SHeiko Schocher
19603f4978c7SHeiko Schocher		ported i2c driver to the new framework:
1961ea818dbbSHeiko Schocher		- drivers/i2c/soft_i2c.c:
1962ea818dbbSHeiko Schocher		  - activate first bus with CONFIG_SYS_I2C_SOFT define
1963ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
1964ea818dbbSHeiko Schocher		    for defining speed and slave address
1965ea818dbbSHeiko Schocher		  - activate second bus with I2C_SOFT_DECLARATIONS2 define
1966ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
1967ea818dbbSHeiko Schocher		    for defining speed and slave address
1968ea818dbbSHeiko Schocher		  - activate third bus with I2C_SOFT_DECLARATIONS3 define
1969ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
1970ea818dbbSHeiko Schocher		    for defining speed and slave address
1971ea818dbbSHeiko Schocher		  - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
1972ea818dbbSHeiko Schocher		    CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
1973ea818dbbSHeiko Schocher		    for defining speed and slave address
19743f4978c7SHeiko Schocher
197500f792e0SHeiko Schocher		- drivers/i2c/fsl_i2c.c:
197600f792e0SHeiko Schocher		  - activate i2c driver with CONFIG_SYS_I2C_FSL
197700f792e0SHeiko Schocher		    define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
197800f792e0SHeiko Schocher		    offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
197900f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
198000f792e0SHeiko Schocher		    bus.
198100f792e0SHeiko Schocher                  - If your board supports a second fsl i2c bus, define
198200f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
198300f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SPEED for the speed and
198400f792e0SHeiko Schocher		    CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
198500f792e0SHeiko Schocher		    second bus.
198600f792e0SHeiko Schocher
19871f2ba722SSimon Glass		- drivers/i2c/tegra_i2c.c:
19881f2ba722SSimon Glass		 - activate this driver with CONFIG_SYS_I2C_TEGRA
19891f2ba722SSimon Glass		 - This driver adds 4 i2c buses with a fix speed from
19901f2ba722SSimon Glass		   100000 and the slave addr 0!
19911f2ba722SSimon Glass
1992880540deSDirk Eibach		- drivers/i2c/ppc4xx_i2c.c
1993880540deSDirk Eibach		  - activate this driver with CONFIG_SYS_I2C_PPC4XX
1994880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
1995880540deSDirk Eibach		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
1996880540deSDirk Eibach
19973f4978c7SHeiko Schocher		additional defines:
19983f4978c7SHeiko Schocher
19993f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES
20003f4978c7SHeiko Schocher		Hold the number of i2c busses you want to use. If you
20013f4978c7SHeiko Schocher		don't use/have i2c muxes on your i2c bus, this
20023f4978c7SHeiko Schocher		is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
20033f4978c7SHeiko Schocher		omit this define.
20043f4978c7SHeiko Schocher
20053f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS
20063f4978c7SHeiko Schocher		define this, if you don't use i2c muxes on your hardware.
20073f4978c7SHeiko Schocher		if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
20083f4978c7SHeiko Schocher		omit this define.
20093f4978c7SHeiko Schocher
20103f4978c7SHeiko Schocher		CONFIG_SYS_I2C_MAX_HOPS
20113f4978c7SHeiko Schocher		define how many muxes are maximal consecutively connected
20123f4978c7SHeiko Schocher		on one i2c bus. If you not use i2c muxes, omit this
20133f4978c7SHeiko Schocher		define.
20143f4978c7SHeiko Schocher
20153f4978c7SHeiko Schocher		CONFIG_SYS_I2C_BUSES
20163f4978c7SHeiko Schocher		hold a list of busses you want to use, only used if
20173f4978c7SHeiko Schocher		CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
20183f4978c7SHeiko Schocher		a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
20193f4978c7SHeiko Schocher		CONFIG_SYS_NUM_I2C_BUSES = 9:
20203f4978c7SHeiko Schocher
20213f4978c7SHeiko Schocher		 CONFIG_SYS_I2C_BUSES	{{0, {I2C_NULL_HOP}}, \
20223f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
20233f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
20243f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
20253f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
20263f4978c7SHeiko Schocher					{0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
20273f4978c7SHeiko Schocher					{1, {I2C_NULL_HOP}}, \
20283f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
20293f4978c7SHeiko Schocher					{1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
20303f4978c7SHeiko Schocher					}
20313f4978c7SHeiko Schocher
20323f4978c7SHeiko Schocher		which defines
20333f4978c7SHeiko Schocher			bus 0 on adapter 0 without a mux
2034ea818dbbSHeiko Schocher			bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
2035ea818dbbSHeiko Schocher			bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
2036ea818dbbSHeiko Schocher			bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
2037ea818dbbSHeiko Schocher			bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
2038ea818dbbSHeiko Schocher			bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
20393f4978c7SHeiko Schocher			bus 6 on adapter 1 without a mux
2040ea818dbbSHeiko Schocher			bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
2041ea818dbbSHeiko Schocher			bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
20423f4978c7SHeiko Schocher
20433f4978c7SHeiko Schocher		If you do not have i2c muxes on your board, omit this define.
20443f4978c7SHeiko Schocher
2045ea818dbbSHeiko Schocher- Legacy I2C Support:	CONFIG_HARD_I2C
20463f4978c7SHeiko Schocher
20473f4978c7SHeiko Schocher		NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
20483f4978c7SHeiko Schocher		provides the following compelling advantages:
20493f4978c7SHeiko Schocher
20503f4978c7SHeiko Schocher		- more than one i2c adapter is usable
20513f4978c7SHeiko Schocher		- approved multibus support
20523f4978c7SHeiko Schocher		- better i2c mux support
20533f4978c7SHeiko Schocher
20543f4978c7SHeiko Schocher		** Please consider updating your I2C driver now. **
20553f4978c7SHeiko Schocher
2056ea818dbbSHeiko Schocher		These enable legacy I2C serial bus commands. Defining
2057ea818dbbSHeiko Schocher		CONFIG_HARD_I2C will include the appropriate I2C driver
2058ea818dbbSHeiko Schocher		for the selected CPU.
2059c609719bSwdenk
2060b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
2061602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
2062b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
2063b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
2064c609719bSwdenk		command line interface.
2065c609719bSwdenk
2066bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
2067c609719bSwdenk
2068b37c7e5eSwdenk		There are several other quantities that must also be
2069ea818dbbSHeiko Schocher		defined when you define CONFIG_HARD_I2C.
2070c609719bSwdenk
20716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
2072b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
20736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
207411ccc33fSMarcel Ziswiler		the CPU's i2c node address).
2075c609719bSwdenk
20768d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
2077a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
20788d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
20798d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
20808d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
2081b37c7e5eSwdenk
20825da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
20835da71efaSEric Millbrandt
20845da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
20855da71efaSEric Millbrandt		chips might think that the current transfer is still
20865da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
20875da71efaSEric Millbrandt		commands until the slave device responds.
20885da71efaSEric Millbrandt
2089b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
2090b37c7e5eSwdenk
2091ea818dbbSHeiko Schocher		If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
2092b37c7e5eSwdenk		then the following macros need to be defined (examples are
2093b37c7e5eSwdenk		from include/configs/lwmon.h):
2094c609719bSwdenk
2095c609719bSwdenk		I2C_INIT
2096c609719bSwdenk
2097b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
2098c609719bSwdenk		controller or configure ports.
2099c609719bSwdenk
2100b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
2101b37c7e5eSwdenk
2102c609719bSwdenk		I2C_PORT
2103c609719bSwdenk
2104c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
2105c609719bSwdenk		assumes both bits are on the same port). Valid values
2106c609719bSwdenk		are 0..3 for ports A..D.
2107c609719bSwdenk
2108c609719bSwdenk		I2C_ACTIVE
2109c609719bSwdenk
2110c609719bSwdenk		The code necessary to make the I2C data line active
2111c609719bSwdenk		(driven).  If the data line is open collector, this
2112c609719bSwdenk		define can be null.
2113c609719bSwdenk
2114b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
2115b37c7e5eSwdenk
2116c609719bSwdenk		I2C_TRISTATE
2117c609719bSwdenk
2118c609719bSwdenk		The code necessary to make the I2C data line tri-stated
2119c609719bSwdenk		(inactive).  If the data line is open collector, this
2120c609719bSwdenk		define can be null.
2121c609719bSwdenk
2122b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2123b37c7e5eSwdenk
2124c609719bSwdenk		I2C_READ
2125c609719bSwdenk
2126472d5460SYork Sun		Code that returns true if the I2C data line is high,
2127472d5460SYork Sun		false if it is low.
2128c609719bSwdenk
2129b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2130b37c7e5eSwdenk
2131c609719bSwdenk		I2C_SDA(bit)
2132c609719bSwdenk
2133472d5460SYork Sun		If <bit> is true, sets the I2C data line high. If it
2134472d5460SYork Sun		is false, it clears it (low).
2135c609719bSwdenk
2136b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
2137b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
2138b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
2139b37c7e5eSwdenk
2140c609719bSwdenk		I2C_SCL(bit)
2141c609719bSwdenk
2142472d5460SYork Sun		If <bit> is true, sets the I2C clock line high. If it
2143472d5460SYork Sun		is false, it clears it (low).
2144c609719bSwdenk
2145b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
2146b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
2147b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
2148b37c7e5eSwdenk
2149c609719bSwdenk		I2C_DELAY
2150c609719bSwdenk
2151c609719bSwdenk		This delay is invoked four times per clock cycle so this
2152c609719bSwdenk		controls the rate of data transfer.  The data rate thus
2153b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
2154b37c7e5eSwdenk		like:
2155b37c7e5eSwdenk
2156b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
2157c609719bSwdenk
2158793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2159793b5726SMike Frysinger
2160793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
2161793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
2162793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
2163793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
2164793b5726SMike Frysinger
2165793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
2166793b5726SMike Frysinger		the generic GPIO functions.
2167793b5726SMike Frysinger
21686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
216947cd00faSwdenk
217047cd00faSwdenk		When a board is reset during an i2c bus transfer
217147cd00faSwdenk		chips might think that the current transfer is still
217247cd00faSwdenk		in progress. On some boards it is possible to access
217347cd00faSwdenk		the i2c SCLK line directly, either by using the
217447cd00faSwdenk		processor pin as a GPIO or by having a second pin
217547cd00faSwdenk		connected to the bus. If this option is defined a
217647cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
217747cd00faSwdenk		is run early in the boot sequence.
217847cd00faSwdenk
217926a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
218026a33504SRichard Retanubun
218126a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
218226a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
218326a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
218426a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
218526a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
218626a33504SRichard Retanubun		controller provide such a method. It is called at the end of
218726a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
218826a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
218926a33504SRichard Retanubun
219017ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
219117ea1177Swdenk
219217ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
219317ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
219417ea1177Swdenk		variable "i2cfast". (see also i2cfast)
219517ea1177Swdenk
2196bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
2197bb99ad6dSBen Warren
2198bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
2199bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
2200bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
2201bb99ad6dSBen Warren		Note that bus numbering is zero-based.
2202bb99ad6dSBen Warren
22036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
2204bb99ad6dSBen Warren
2205bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
22060f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
22070f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
22080f89c54bSPeter Tyser		a 1D array of device addresses
2209bb99ad6dSBen Warren
2210bb99ad6dSBen Warren		e.g.
2211bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
22126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2213bb99ad6dSBen Warren
2214bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
2215bb99ad6dSBen Warren
2216bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
22176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
2218bb99ad6dSBen Warren
2219bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2220bb99ad6dSBen Warren
22216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
2222be5e6181STimur Tabi
2223be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
2224be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2225be5e6181STimur Tabi
22266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
22270dc018ecSStefan Roese
22280dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
22290dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
22300dc018ecSStefan Roese
22316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
22320dc018ecSStefan Roese
22330dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
22340dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
22350dc018ecSStefan Roese
22366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
22379ebbb54fSVictor Gallardo
22389ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
22399ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
22409ebbb54fSVictor Gallardo		specified DTT device.
22419ebbb54fSVictor Gallardo
22422ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
22432ac6985aSAndrew Dyer
22442ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
22452ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
22462ac6985aSAndrew Dyer		between writing the address pointer and reading the
22472ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
22482ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
22492ac6985aSAndrew Dyer		devices can use either method, but some require one or
22502ac6985aSAndrew Dyer		the other.
2251be5e6181STimur Tabi
2252c609719bSwdenk- SPI Support:	CONFIG_SPI
2253c609719bSwdenk
2254c609719bSwdenk		Enables SPI driver (so far only tested with
2255c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2256c609719bSwdenk		D/As on the SACSng board)
2257c609719bSwdenk
22586639562eSYoshihiro Shimoda		CONFIG_SH_SPI
22596639562eSYoshihiro Shimoda
22606639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
22616639562eSYoshihiro Shimoda		only SH7757 is supported.
22626639562eSYoshihiro Shimoda
2263c609719bSwdenk		CONFIG_SPI_X
2264c609719bSwdenk
2265c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2266c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2267c609719bSwdenk
2268c609719bSwdenk		CONFIG_SOFT_SPI
2269c609719bSwdenk
2270c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2271c609719bSwdenk		using hardware support. This is a general purpose
2272c609719bSwdenk		driver that only requires three general I/O port pins
2273c609719bSwdenk		(two outputs, one input) to function. If this is
2274c609719bSwdenk		defined, the board configuration must define several
2275c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2276c609719bSwdenk		an example, see include/configs/sacsng.h.
2277c609719bSwdenk
227804a9e118SBen Warren		CONFIG_HARD_SPI
227904a9e118SBen Warren
228004a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
228104a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
228204a9e118SBen Warren		must define a list of chip-select function pointers.
228304a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
228404a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
228504a9e118SBen Warren
228638254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
228738254f45SGuennadi Liakhovetski
228838254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
22892e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
229038254f45SGuennadi Liakhovetski
22910133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
22920133502eSMatthias Fuchs
22930133502eSMatthias Fuchs		Enables FPGA subsystem.
22940133502eSMatthias Fuchs
22950133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
22960133502eSMatthias Fuchs
22970133502eSMatthias Fuchs		Enables support for specific chip vendors.
22980133502eSMatthias Fuchs		(ALTERA, XILINX)
22990133502eSMatthias Fuchs
23000133502eSMatthias Fuchs		CONFIG_FPGA_<family>
23010133502eSMatthias Fuchs
23020133502eSMatthias Fuchs		Enables support for FPGA family.
23030133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
23040133502eSMatthias Fuchs
23050133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2306c609719bSwdenk
2307c609719bSwdenk		Specify the number of FPGA devices to support.
2308c609719bSwdenk
23096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2310c609719bSwdenk
2311c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2312c609719bSwdenk
23136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2314c609719bSwdenk
2315c609719bSwdenk		Enable checks on FPGA configuration interface busy
2316c609719bSwdenk		status by the configuration function. This option
2317c609719bSwdenk		will require a board or device specific function to
2318c609719bSwdenk		be written.
2319c609719bSwdenk
2320c609719bSwdenk		CONFIG_FPGA_DELAY
2321c609719bSwdenk
2322c609719bSwdenk		If defined, a function that provides delays in the FPGA
2323c609719bSwdenk		configuration driver.
2324c609719bSwdenk
23256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2326c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2327c609719bSwdenk
23286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2329c609719bSwdenk
2330c609719bSwdenk		Check for configuration errors during FPGA bitfile
2331c609719bSwdenk		loading. For example, abort during Virtex II
2332c609719bSwdenk		configuration if the INIT_B line goes low (which
2333c609719bSwdenk		indicated a CRC error).
2334c609719bSwdenk
23356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2336c609719bSwdenk
2337c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2338c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2339c609719bSwdenk		FPGA configuration sequence. The default time is 500
234011ccc33fSMarcel Ziswiler		ms.
2341c609719bSwdenk
23426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2343c609719bSwdenk
2344c609719bSwdenk		Maximum time to wait for BUSY to deassert during
234511ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2346c609719bSwdenk
23476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2348c609719bSwdenk
2349c609719bSwdenk		Time to wait after FPGA configuration. The default is
235011ccc33fSMarcel Ziswiler		200 ms.
2351c609719bSwdenk
2352c609719bSwdenk- Configuration Management:
2353c609719bSwdenk		CONFIG_IDENT_STRING
2354c609719bSwdenk
2355c609719bSwdenk		If defined, this string will be added to the U-Boot
2356c609719bSwdenk		version information (U_BOOT_VERSION)
2357c609719bSwdenk
2358c609719bSwdenk- Vendor Parameter Protection:
2359c609719bSwdenk
2360c609719bSwdenk		U-Boot considers the values of the environment
2361c609719bSwdenk		variables "serial#" (Board Serial Number) and
23627152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2363c609719bSwdenk		are set once by the board vendor / manufacturer, and
2364c609719bSwdenk		protects these variables from casual modification by
2365c609719bSwdenk		the user. Once set, these variables are read-only,
2366c609719bSwdenk		and write or delete attempts are rejected. You can
236711ccc33fSMarcel Ziswiler		change this behaviour:
2368c609719bSwdenk
2369c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2370c609719bSwdenk		file, the write protection for vendor parameters is
237147cd00faSwdenk		completely disabled. Anybody can change or delete
2372c609719bSwdenk		these parameters.
2373c609719bSwdenk
2374c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2375c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
237611ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2377c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2378c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2379c609719bSwdenk		read-only.]
2380c609719bSwdenk
23812598090bSJoe Hershberger		The same can be accomplished in a more flexible way
23822598090bSJoe Hershberger		for any variable by configuring the type of access
23832598090bSJoe Hershberger		to allow for those variables in the ".flags" variable
23842598090bSJoe Hershberger		or define CONFIG_ENV_FLAGS_LIST_STATIC.
23852598090bSJoe Hershberger
2386c609719bSwdenk- Protected RAM:
2387c609719bSwdenk		CONFIG_PRAM
2388c609719bSwdenk
2389c609719bSwdenk		Define this variable to enable the reservation of
2390c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2391c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2392c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2393c609719bSwdenk		this default value by defining an environment
2394c609719bSwdenk		variable "pram" to the number of kB you want to
2395c609719bSwdenk		reserve. Note that the board info structure will
2396c609719bSwdenk		still show the full amount of RAM. If pRAM is
2397c609719bSwdenk		reserved, a new environment variable "mem" will
2398c609719bSwdenk		automatically be defined to hold the amount of
2399c609719bSwdenk		remaining RAM in a form that can be passed as boot
2400c609719bSwdenk		argument to Linux, for instance like that:
2401c609719bSwdenk
2402fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2403c609719bSwdenk			saveenv
2404c609719bSwdenk
2405c609719bSwdenk		This way you can tell Linux not to use this memory,
2406c609719bSwdenk		either, which results in a memory region that will
2407c609719bSwdenk		not be affected by reboots.
2408c609719bSwdenk
2409c609719bSwdenk		*WARNING* If your board configuration uses automatic
2410c609719bSwdenk		detection of the RAM size, you must make sure that
2411c609719bSwdenk		this memory test is non-destructive. So far, the
2412c609719bSwdenk		following board configurations are known to be
2413c609719bSwdenk		"pRAM-clean":
2414c609719bSwdenk
24151b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
24161b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2417544d97e9SWolfgang Denk			FLAGADM, TQM8260
2418c609719bSwdenk
241940fef049SGabe Black- Access to physical memory region (> 4GB)
242040fef049SGabe Black		Some basic support is provided for operations on memory not
242140fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
242240fef049SGabe Black		support access to more than 4GB of memory on 32-bit
242340fef049SGabe Black		machines using physical address extension or similar.
242440fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
242540fef049SGabe Black		currently only supports clearing the memory.
242640fef049SGabe Black
2427c609719bSwdenk- Error Recovery:
2428c609719bSwdenk		CONFIG_PANIC_HANG
2429c609719bSwdenk
2430c609719bSwdenk		Define this variable to stop the system in case of a
2431c609719bSwdenk		fatal error, so that you have to reset it manually.
2432c609719bSwdenk		This is probably NOT a good idea for an embedded
243311ccc33fSMarcel Ziswiler		system where you want the system to reboot
2434c609719bSwdenk		automatically as fast as possible, but it may be
2435c609719bSwdenk		useful during development since you can try to debug
2436c609719bSwdenk		the conditions that lead to the situation.
2437c609719bSwdenk
2438c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2439c609719bSwdenk
2440c609719bSwdenk		This variable defines the number of retries for
2441c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2442c609719bSwdenk		before giving up the operation. If not defined, a
2443c609719bSwdenk		default value of 5 is used.
2444c609719bSwdenk
244540cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
244640cb90eeSGuennadi Liakhovetski
244740cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
244840cb90eeSGuennadi Liakhovetski
244948a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
245048a3e999STetsuyuki Kobayashi
245148a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
245248a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
245348a3e999STetsuyuki Kobayashi		try longer timeout such as
245448a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
245548a3e999STetsuyuki Kobayashi
2456c609719bSwdenk- Command Interpreter:
24578078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
245804a85b3bSwdenk
245904a85b3bSwdenk		Enable auto completion of commands using TAB.
246004a85b3bSwdenk
24618078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
24628078f1a5SWolfgang Denk		for the "hush" shell.
24638078f1a5SWolfgang Denk
24648078f1a5SWolfgang Denk
24656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2466c609719bSwdenk
2467c609719bSwdenk		Define this variable to enable the "hush" shell (from
2468c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2469c609719bSwdenk		powerful command line syntax like
2470c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2471c609719bSwdenk		constructs ("shell scripts").
2472c609719bSwdenk
2473c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2474c609719bSwdenk		with a somewhat smaller memory footprint.
2475c609719bSwdenk
2476c609719bSwdenk
24776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2478c609719bSwdenk
2479c609719bSwdenk		This defines the secondary prompt string, which is
2480c609719bSwdenk		printed when the command interpreter needs more input
2481c609719bSwdenk		to complete a command. Usually "> ".
2482c609719bSwdenk
2483c609719bSwdenk	Note:
2484c609719bSwdenk
2485c609719bSwdenk		In the current implementation, the local variables
2486c609719bSwdenk		space and global environment variables space are
2487c609719bSwdenk		separated. Local variables are those you define by
24883b57fe0aSwdenk		simply typing `name=value'. To access a local
2489c609719bSwdenk		variable later on, you have write `$name' or
24903b57fe0aSwdenk		`${name}'; to execute the contents of a variable
24913b57fe0aSwdenk		directly type `$name' at the command prompt.
2492c609719bSwdenk
2493c609719bSwdenk		Global environment variables are those you use
2494c609719bSwdenk		setenv/printenv to work with. To run a command stored
2495c609719bSwdenk		in such a variable, you need to use the run command,
2496c609719bSwdenk		and you must not use the '$' sign to access them.
2497c609719bSwdenk
2498c609719bSwdenk		To store commands and special characters in a
2499c609719bSwdenk		variable, please use double quotation marks
2500c609719bSwdenk		surrounding the whole text of the variable, instead
2501c609719bSwdenk		of the backslashes before semicolons and special
2502c609719bSwdenk		symbols.
2503c609719bSwdenk
2504aa0c71acSWolfgang Denk- Commandline Editing and History:
2505aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2506aa0c71acSWolfgang Denk
250711ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2508aa0c71acSWolfgang Denk		commandline input operations
2509aa0c71acSWolfgang Denk
2510a8c7c708Swdenk- Default Environment:
2511c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2512c609719bSwdenk
2513c609719bSwdenk		Define this to contain any number of null terminated
2514c609719bSwdenk		strings (variable = value pairs) that will be part of
25157152b1d0Swdenk		the default environment compiled into the boot image.
25162262cfeeSwdenk
2517c609719bSwdenk		For example, place something like this in your
2518c609719bSwdenk		board's config file:
2519c609719bSwdenk
2520c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2521c609719bSwdenk			"myvar1=value1\0" \
2522c609719bSwdenk			"myvar2=value2\0"
2523c609719bSwdenk
2524c609719bSwdenk		Warning: This method is based on knowledge about the
2525c609719bSwdenk		internal format how the environment is stored by the
25262262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2527c609719bSwdenk		interface! Although it is unlikely that this format
25287152b1d0Swdenk		will change soon, there is no guarantee either.
2529c609719bSwdenk		You better know what you are doing here.
2530c609719bSwdenk
2531c609719bSwdenk		Note: overly (ab)use of the default environment is
2532c609719bSwdenk		discouraged. Make sure to check other ways to preset
253374de7aefSWolfgang Denk		the environment like the "source" command or the
2534c609719bSwdenk		boot command first.
2535c609719bSwdenk
25365e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
25375e724ca2SStephen Warren
25385e724ca2SStephen Warren		Define this in order to add variables describing the
25395e724ca2SStephen Warren		U-Boot build configuration to the default environment.
25405e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
25415e724ca2SStephen Warren
25425e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
25435e724ca2SStephen Warren
25445e724ca2SStephen Warren		- CONFIG_SYS_ARCH
25455e724ca2SStephen Warren		- CONFIG_SYS_CPU
25465e724ca2SStephen Warren		- CONFIG_SYS_BOARD
25475e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
25485e724ca2SStephen Warren		- CONFIG_SYS_SOC
25495e724ca2SStephen Warren
25507e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
25517e27f89fSTom Rini
25527e27f89fSTom Rini		Define this in order to add variables describing certain
25537e27f89fSTom Rini		run-time determined information about the hardware to the
25547e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
25557e27f89fSTom Rini
255606fd8538SSimon Glass		CONFIG_DELAY_ENVIRONMENT
255706fd8538SSimon Glass
255806fd8538SSimon Glass		Normally the environment is loaded when the board is
255906fd8538SSimon Glass		intialised so that it is available to U-Boot. This inhibits
256006fd8538SSimon Glass		that so that the environment is not available until
256106fd8538SSimon Glass		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
256206fd8538SSimon Glass		this is instead controlled by the value of
256306fd8538SSimon Glass		/config/load-environment.
256406fd8538SSimon Glass
2565a8c7c708Swdenk- DataFlash Support:
25662abbe075Swdenk		CONFIG_HAS_DATAFLASH
25672abbe075Swdenk
25682abbe075Swdenk		Defining this option enables DataFlash features and
25692abbe075Swdenk		allows to read/write in Dataflash via the standard
25702abbe075Swdenk		commands cp, md...
25712abbe075Swdenk
2572f61ec45eSEric Nelson- Serial Flash support
2573f61ec45eSEric Nelson		CONFIG_CMD_SF
2574f61ec45eSEric Nelson
2575f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2576f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2577f61ec45eSEric Nelson
2578f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2579f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2580f61ec45eSEric Nelson		commands.
2581f61ec45eSEric Nelson
2582f61ec45eSEric Nelson		The following defaults may be provided by the platform
2583f61ec45eSEric Nelson		to handle the common case when only a single serial
2584f61ec45eSEric Nelson		flash is present on the system.
2585f61ec45eSEric Nelson
2586f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2587f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2588f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2589f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2590f61ec45eSEric Nelson
259124007273SSimon Glass		CONFIG_CMD_SF_TEST
259224007273SSimon Glass
259324007273SSimon Glass		Define this option to include a destructive SPI flash
259424007273SSimon Glass		test ('sf test').
259524007273SSimon Glass
25961dcd6d03SJagannadha Sutradharudu Teki		CONFIG_SPI_FLASH_BAR		Ban/Extended Addr Reg
25971dcd6d03SJagannadha Sutradharudu Teki
25981dcd6d03SJagannadha Sutradharudu Teki		Define this option to use the Bank addr/Extended addr
25991dcd6d03SJagannadha Sutradharudu Teki		support on SPI flashes which has size > 16Mbytes.
26001dcd6d03SJagannadha Sutradharudu Teki
26013f85ce27Swdenk- SystemACE Support:
26023f85ce27Swdenk		CONFIG_SYSTEMACE
26033f85ce27Swdenk
26043f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
26053f85ce27Swdenk		chips attached via some sort of local bus. The address
260611ccc33fSMarcel Ziswiler		of the chip must also be defined in the
26076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
26083f85ce27Swdenk
26093f85ce27Swdenk		#define CONFIG_SYSTEMACE
26106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
26113f85ce27Swdenk
26123f85ce27Swdenk		When SystemACE support is added, the "ace" device type
26133f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
26143f85ce27Swdenk
2615ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2616ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2617ecb0ccd9SWolfgang Denk
261828cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2619ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
262028cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2621ecb0ccd9SWolfgang Denk		number generator is used.
2622ecb0ccd9SWolfgang Denk
262328cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
262428cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
262528cb9375SWolfgang Denk		defined, the normal port 69 is used.
262628cb9375SWolfgang Denk
262728cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2628ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2629ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2630ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2631ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2632ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2633ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2634ecb0ccd9SWolfgang Denk
2635bf36c5d5SSimon Glass- Hashing support:
2636bf36c5d5SSimon Glass		CONFIG_CMD_HASH
2637bf36c5d5SSimon Glass
2638bf36c5d5SSimon Glass		This enables a generic 'hash' command which can produce
2639bf36c5d5SSimon Glass		hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2640bf36c5d5SSimon Glass
2641bf36c5d5SSimon Glass		CONFIG_HASH_VERIFY
2642bf36c5d5SSimon Glass
2643bf36c5d5SSimon Glass		Enable the hash verify command (hash -v). This adds to code
2644bf36c5d5SSimon Glass		size a little.
2645bf36c5d5SSimon Glass
2646bf36c5d5SSimon Glass		CONFIG_SHA1 - support SHA1 hashing
2647bf36c5d5SSimon Glass		CONFIG_SHA256 - support SHA256 hashing
2648bf36c5d5SSimon Glass
2649bf36c5d5SSimon Glass		Note: There is also a sha1sum command, which should perhaps
2650bf36c5d5SSimon Glass		be deprecated in favour of 'hash sha1'.
2651bf36c5d5SSimon Glass
2652a11f1873SRobert Winkler- Freescale i.MX specific commands:
2653a11f1873SRobert Winkler		CONFIG_CMD_HDMIDETECT
2654a11f1873SRobert Winkler		This enables 'hdmidet' command which returns true if an
2655a11f1873SRobert Winkler		HDMI monitor is detected.  This command is i.MX 6 specific.
2656a11f1873SRobert Winkler
2657a11f1873SRobert Winkler		CONFIG_CMD_BMODE
2658a11f1873SRobert Winkler		This enables the 'bmode' (bootmode) command for forcing
2659a11f1873SRobert Winkler		a boot from specific media.
2660a11f1873SRobert Winkler
2661a11f1873SRobert Winkler		This is useful for forcing the ROM's usb downloader to
2662a11f1873SRobert Winkler		activate upon a watchdog reset which is nice when iterating
2663a11f1873SRobert Winkler		on U-Boot.  Using the reset button or running bmode normal
2664a11f1873SRobert Winkler		will set it back to normal.  This command currently
2665a11f1873SRobert Winkler		supports i.MX53 and i.MX6.
2666a11f1873SRobert Winkler
266719c402afSSimon Glass- Signing support:
266819c402afSSimon Glass		CONFIG_RSA
266919c402afSSimon Glass
267019c402afSSimon Glass		This enables the RSA algorithm used for FIT image verification
267119c402afSSimon Glass		in U-Boot. See doc/uImage/signature for more information.
267219c402afSSimon Glass
267319c402afSSimon Glass		The signing part is build into mkimage regardless of this
267419c402afSSimon Glass		option.
267519c402afSSimon Glass
267619c402afSSimon Glass
2677a8c7c708Swdenk- Show boot progress:
2678c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2679c609719bSwdenk
2680c609719bSwdenk		Defining this option allows to add some board-
2681c609719bSwdenk		specific code (calling a user-provided function
2682c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2683c609719bSwdenk		the system's boot progress on some display (for
2684c609719bSwdenk		example, some LED's) on your board. At the moment,
2685c609719bSwdenk		the following checkpoints are implemented:
2686c609719bSwdenk
26873a608ca0SSimon Glass- Detailed boot stage timing
26883a608ca0SSimon Glass		CONFIG_BOOTSTAGE
26893a608ca0SSimon Glass		Define this option to get detailed timing of each stage
26903a608ca0SSimon Glass		of the boot process.
26913a608ca0SSimon Glass
26923a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
26933a608ca0SSimon Glass		This is the number of available user bootstage records.
26943a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
26953a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
26963a608ca0SSimon Glass		the limit, recording will stop.
26973a608ca0SSimon Glass
26983a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
26993a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
27003a608ca0SSimon Glass
27013a608ca0SSimon Glass		Timer summary in microseconds:
27023a608ca0SSimon Glass		       Mark    Elapsed  Stage
27033a608ca0SSimon Glass			  0          0  reset
27043a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
27053a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
27063a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
27073a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
27083a608ca0SSimon Glass		  3,910,375    250,777  main_loop
27093a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
27103a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
27113a608ca0SSimon Glass
27122eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
27132eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
27142eba38cfSSimon Glass		and un/stashing of bootstage data.
27152eba38cfSSimon Glass
271694fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
271794fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
271894fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
271994fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
272094fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
272194fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
272294fd1316SSimon Glass		For example:
272394fd1316SSimon Glass
272494fd1316SSimon Glass		bootstage {
272594fd1316SSimon Glass			154 {
272694fd1316SSimon Glass				name = "board_init_f";
272794fd1316SSimon Glass				mark = <3575678>;
272894fd1316SSimon Glass			};
272994fd1316SSimon Glass			170 {
273094fd1316SSimon Glass				name = "lcd";
273194fd1316SSimon Glass				accum = <33482>;
273294fd1316SSimon Glass			};
273394fd1316SSimon Glass		};
273494fd1316SSimon Glass
273594fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
273694fd1316SSimon Glass
27371372cce2SMarian BalakowiczLegacy uImage format:
27381372cce2SMarian Balakowicz
2739c609719bSwdenk  Arg	Where			When
2740c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2741c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2742c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2743c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2744c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2745c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2746c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2747c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2748c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
27491372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2750c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2751c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2752c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2753c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
27541372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2755c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
27561372cce2SMarian Balakowicz
27571372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
27581372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
27591372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
27601372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
27611372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
27621372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
27631372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
276411ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
27651372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
27661372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
27671372cce2SMarian Balakowicz
2768ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2769c609719bSwdenk
2770a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
277163e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
277263e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
277363e73c9aSwdenk
2774566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2775566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2776566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2777566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2778566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2779566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2780566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2781566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2782566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2783566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2784566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2785566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2786566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2787566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2788566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2789566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2790566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2791566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2792566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2793566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2794566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2795566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2796566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2797566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2798566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2799566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2800566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2801566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2802566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2803566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2804566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2805566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2806566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2807566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2808566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2809566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2810566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2811566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2812566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2813566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2814566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2815566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2816566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2817566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2818566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2819566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2820566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2821c609719bSwdenk
2822566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2823c609719bSwdenk
2824566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2825566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2826566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2827206c60cbSwdenk
2828566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2829566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
283011ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2831566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2832566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2833566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
283474de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
283574de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2836566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2837c609719bSwdenk
28381372cce2SMarian BalakowiczFIT uImage format:
28391372cce2SMarian Balakowicz
28401372cce2SMarian Balakowicz  Arg	Where			When
28411372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
28421372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
28431372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
28441372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
28451372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
28461372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2847f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
28481372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
28491372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
28501372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
28511372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
28521372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
285311ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
285411ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
28551372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
28561372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
28571372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
28581372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
28591372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
28601372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
28611372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
28621372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
28631372cce2SMarian Balakowicz
28641372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
28651372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
28661372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
286711ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
28681372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
28691372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
28701372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
28711372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
28721372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
28731372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
28741372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
28751372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
28761372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
28771372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
28781372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
28791372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
28801372cce2SMarian Balakowicz
288111ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
28821372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
28831372cce2SMarian Balakowicz
288411ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
28851372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
28861372cce2SMarian Balakowicz
288711ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
28881372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
28891372cce2SMarian Balakowicz
2890d95f6ec7SGabe Black- FIT image support:
2891d95f6ec7SGabe Black		CONFIG_FIT
2892d95f6ec7SGabe Black		Enable support for the FIT uImage format.
2893d95f6ec7SGabe Black
2894d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
2895d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
2896d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
2897d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
2898d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
2899d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
2900d95f6ec7SGabe Black
29013e569a6bSSimon Glass		CONFIG_FIT_SIGNATURE
29023e569a6bSSimon Glass		This option enables signature verification of FIT uImages,
29033e569a6bSSimon Glass		using a hash signed and verified using RSA. See
29043e569a6bSSimon Glass		doc/uImage.FIT/signature.txt for more details.
29053e569a6bSSimon Glass
29064cf2609bSWolfgang Denk- Standalone program support:
29074cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
29084cf2609bSWolfgang Denk
29096feff899SWolfgang Denk		This option defines a board specific value for the
29106feff899SWolfgang Denk		address where standalone program gets loaded, thus
29116feff899SWolfgang Denk		overwriting the architecture dependent default
29124cf2609bSWolfgang Denk		settings.
29134cf2609bSWolfgang Denk
29144cf2609bSWolfgang Denk- Frame Buffer Address:
29154cf2609bSWolfgang Denk		CONFIG_FB_ADDR
29164cf2609bSWolfgang Denk
29174cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
291844a53b57SWolfgang Denk		address for frame buffer.  This is typically the case
291944a53b57SWolfgang Denk		when using a graphics controller has separate video
292044a53b57SWolfgang Denk		memory.  U-Boot will then place the frame buffer at
292144a53b57SWolfgang Denk		the given address instead of dynamically reserving it
292244a53b57SWolfgang Denk		in system RAM by calling lcd_setmem(), which grabs
292344a53b57SWolfgang Denk		the memory for the frame buffer depending on the
292444a53b57SWolfgang Denk		configured panel size.
29254cf2609bSWolfgang Denk
29264cf2609bSWolfgang Denk		Please see board_init_f function.
29274cf2609bSWolfgang Denk
2928cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2929cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2930cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2931cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2932cccfc2abSDetlev Zundel
2933cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2934cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2935cccfc2abSDetlev Zundel
2936cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2937cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2938cccfc2abSDetlev Zundel
2939cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2940cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2941cccfc2abSDetlev Zundel
2942cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2943cccfc2abSDetlev Zundel
2944cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2945cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2946cccfc2abSDetlev Zundel
294770c219cdSJoe Hershberger- UBI support
294870c219cdSJoe Hershberger		CONFIG_CMD_UBI
294970c219cdSJoe Hershberger
295070c219cdSJoe Hershberger		Adds commands for interacting with MTD partitions formatted
295170c219cdSJoe Hershberger		with the UBI flash translation layer
295270c219cdSJoe Hershberger
295370c219cdSJoe Hershberger		Requires also defining CONFIG_RBTREE
295470c219cdSJoe Hershberger
2955147162daSJoe Hershberger		CONFIG_UBI_SILENCE_MSG
2956147162daSJoe Hershberger
2957147162daSJoe Hershberger		Make the verbose messages from UBI stop printing.  This leaves
2958147162daSJoe Hershberger		warnings and errors enabled.
2959147162daSJoe Hershberger
296070c219cdSJoe Hershberger- UBIFS support
296170c219cdSJoe Hershberger		CONFIG_CMD_UBIFS
296270c219cdSJoe Hershberger
296370c219cdSJoe Hershberger		Adds commands for interacting with UBI volumes formatted as
296470c219cdSJoe Hershberger		UBIFS.  UBIFS is read-only in u-boot.
296570c219cdSJoe Hershberger
296670c219cdSJoe Hershberger		Requires UBI support as well as CONFIG_LZO
296770c219cdSJoe Hershberger
2968147162daSJoe Hershberger		CONFIG_UBIFS_SILENCE_MSG
2969147162daSJoe Hershberger
2970147162daSJoe Hershberger		Make the verbose messages from UBIFS stop printing.  This leaves
2971147162daSJoe Hershberger		warnings and errors enabled.
2972147162daSJoe Hershberger
29736a11cf48SDaniel Schwierzeck- SPL framework
29746a11cf48SDaniel Schwierzeck		CONFIG_SPL
29756a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
29766a11cf48SDaniel Schwierzeck
297795579793STom Rini		CONFIG_SPL_LDSCRIPT
297895579793STom Rini		LDSCRIPT for linking the SPL binary.
297995579793STom Rini
29806ebc3461SAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT
29816ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL, BSS included.
29826ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory
29836ebc3461SAlbert ARIBAUD		used by SPL from _start to __bss_end does not exceed it.
29848960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
29856ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
29866ebc3461SAlbert ARIBAUD
298795579793STom Rini		CONFIG_SPL_MAX_SIZE
29886ebc3461SAlbert ARIBAUD		Maximum size of the SPL image (text, data, rodata, and
29896ebc3461SAlbert ARIBAUD		linker lists sections), BSS excluded.
29906ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual size does
29916ebc3461SAlbert ARIBAUD		not exceed it.
299295579793STom Rini
29936a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
29946a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
29956a11cf48SDaniel Schwierzeck
299694a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
299794a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
299894a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
299994a45bb1SScott Wood
300095579793STom Rini		CONFIG_SPL_BSS_START_ADDR
300195579793STom Rini		Link address for the BSS within the SPL binary.
300295579793STom Rini
300395579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
30046ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL BSS.
30056ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory used
30066ebc3461SAlbert ARIBAUD		by SPL from __bss_start to __bss_end does not exceed it.
30078960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
30086ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
300995579793STom Rini
301095579793STom Rini		CONFIG_SPL_STACK
301195579793STom Rini		Adress of the start of the stack SPL will use
301295579793STom Rini
301394a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
301494a45bb1SScott Wood		Adress of the start of the stack SPL will use after
301594a45bb1SScott Wood		relocation.  If unspecified, this is equal to
301694a45bb1SScott Wood		CONFIG_SPL_STACK.
301794a45bb1SScott Wood
301895579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
301995579793STom Rini		Starting address of the malloc pool used in SPL.
302095579793STom Rini
302195579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
302295579793STom Rini		The size of the malloc pool used in SPL.
30236a11cf48SDaniel Schwierzeck
302447f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
302547f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
302647f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
302747f7bcaeSTom Rini		NAND loading of the Linux Kernel.
302847f7bcaeSTom Rini
3029861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
3030861a86f4STom Rini		For ARM, enable an optional function to print more information
3031861a86f4STom Rini		about the running system.
3032861a86f4STom Rini
30334b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
30344b919725SScott Wood		Arch init code should be built for a very small image
30354b919725SScott Wood
30366a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
30376a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
30386a11cf48SDaniel Schwierzeck
30396a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
30406a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
30416a11cf48SDaniel Schwierzeck
30426a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
30436a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
30446a11cf48SDaniel Schwierzeck
30456a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
30466a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
30476a11cf48SDaniel Schwierzeck
30486a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
30496a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
30506a11cf48SDaniel Schwierzeck
305195579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
305295579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
305395579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
305495579793STom Rini		Address, size and partition on the MMC to load U-Boot from
305595579793STom Rini		when the MMC is being used in raw mode.
305695579793STom Rini
30572b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
30582b75b0adSPeter Korsgaard		Sector to load kernel uImage from when MMC is being
30592b75b0adSPeter Korsgaard		used in raw mode (for Falcon mode)
30602b75b0adSPeter Korsgaard
30612b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
30622b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
30632b75b0adSPeter Korsgaard		Sector and number of sectors to load kernel argument
30642b75b0adSPeter Korsgaard		parameters from when MMC is being used in raw mode
30652b75b0adSPeter Korsgaard		(for falcon mode)
30662b75b0adSPeter Korsgaard
306795579793STom Rini		CONFIG_SPL_FAT_SUPPORT
306895579793STom Rini		Support for fs/fat/libfat.o in SPL binary
306995579793STom Rini
307095579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
307195579793STom Rini		Filename to read to load U-Boot when reading from FAT
307295579793STom Rini
30737ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_KERNEL_NAME
30747ad2cc79SPeter Korsgaard		Filename to read to load kernel uImage when reading
30757ad2cc79SPeter Korsgaard		from FAT (for Falcon mode)
30767ad2cc79SPeter Korsgaard
30777ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_ARGS_NAME
30787ad2cc79SPeter Korsgaard		Filename to read to load kernel argument parameters
30797ad2cc79SPeter Korsgaard		when reading from FAT (for Falcon mode)
30807ad2cc79SPeter Korsgaard
308106f60ae3SScott Wood		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
308206f60ae3SScott Wood		Set this for NAND SPL on PPC mpc83xx targets, so that
308306f60ae3SScott Wood		start.S waits for the rest of the SPL to load before
308406f60ae3SScott Wood		continuing (the hardware starts execution after just
308506f60ae3SScott Wood		loading the first page rather than the full 4K).
308606f60ae3SScott Wood
30876f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
30886f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
30896f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
30906f2f01b9SScott Wood
30916f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
30926f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
30936f2f01b9SScott Wood
30946f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
30956f2f01b9SScott Wood		Include standard software ECC in the SPL
30966f2f01b9SScott Wood
309795579793STom Rini		CONFIG_SPL_NAND_SIMPLE
30987d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
30997d4b7955SScott Wood		expose the cmd_ctrl() interface.
310095579793STom Rini
3101bb0dc108SYing Zhang		CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
3102bb0dc108SYing Zhang		Set for the SPL on PPC mpc8xxx targets, support for
3103bb0dc108SYing Zhang		arch/powerpc/cpu/mpc8xxx/ddr/libddr.o in SPL binary.
3104bb0dc108SYing Zhang
31057c8eea59SYing Zhang		CONFIG_SPL_COMMON_INIT_DDR
31067c8eea59SYing Zhang		Set for common ddr init with serial presence detect in
31077c8eea59SYing Zhang		SPL binary.
31087c8eea59SYing Zhang
310995579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
311095579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
311195579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
311295579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
311395579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
311495579793STom Rini		Defines the size and behavior of the NAND that SPL uses
31157d4b7955SScott Wood		to read U-Boot
311695579793STom Rini
311795579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
31187d4b7955SScott Wood		Location in NAND to read U-Boot from
31197d4b7955SScott Wood
31207d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
31217d4b7955SScott Wood		Location in memory to load U-Boot to
31227d4b7955SScott Wood
31237d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
31247d4b7955SScott Wood		Size of image to load
312595579793STom Rini
312695579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
31277d4b7955SScott Wood		Entry point in loaded image to jump to
312895579793STom Rini
312995579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
313095579793STom Rini		Define this if you need to first read the OOB and then the
313195579793STom Rini		data. This is used for example on davinci plattforms.
313295579793STom Rini
313395579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
313495579793STom Rini		Support for an OMAP3-specific set of functions to return the
313595579793STom Rini		ID and MFR of the first attached NAND chip, if present.
313695579793STom Rini
31376a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
31386a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
31396a11cf48SDaniel Schwierzeck
31406a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
31416a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
31426a11cf48SDaniel Schwierzeck
31436a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
31446a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
31456a11cf48SDaniel Schwierzeck
3146c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
3147c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
3148c57b953dSPavel Machek
31496a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
31506a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
31511372cce2SMarian Balakowicz
3152ba1bee43SYing Zhang		CONFIG_SPL_ENV_SUPPORT
3153ba1bee43SYing Zhang		Support for the environment operating in SPL binary
3154ba1bee43SYing Zhang
3155ba1bee43SYing Zhang		CONFIG_SPL_NET_SUPPORT
3156ba1bee43SYing Zhang		Support for the net/libnet.o in SPL binary.
3157ba1bee43SYing Zhang		It conflicts with SPL env from storage medium specified by
3158ba1bee43SYing Zhang		CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3159ba1bee43SYing Zhang
316074752baaSScott Wood		CONFIG_SPL_PAD_TO
31616113d3f2SBenoît Thébaudeau		Image offset to which the SPL should be padded before appending
31626113d3f2SBenoît Thébaudeau		the SPL payload. By default, this is defined as
31636113d3f2SBenoît Thébaudeau		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
31646113d3f2SBenoît Thébaudeau		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
31656113d3f2SBenoît Thébaudeau		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
316674752baaSScott Wood
3167ca2fca22SScott Wood		CONFIG_SPL_TARGET
3168ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
3169ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
3170ca2fca22SScott Wood		example if more than one image needs to be produced.
3171ca2fca22SScott Wood
317287ebee39SSimon Glass		CONFIG_FIT_SPL_PRINT
317387ebee39SSimon Glass		Printing information about a FIT image adds quite a bit of
317487ebee39SSimon Glass		code to SPL. So this is normally disabled in SPL. Use this
317587ebee39SSimon Glass		option to re-enable it. This will affect the output of the
317687ebee39SSimon Glass		bootm command when booting a FIT image.
317787ebee39SSimon Glass
31783aa29de0SYing Zhang- TPL framework
31793aa29de0SYing Zhang		CONFIG_TPL
31803aa29de0SYing Zhang		Enable building of TPL globally.
31813aa29de0SYing Zhang
31823aa29de0SYing Zhang		CONFIG_TPL_PAD_TO
31833aa29de0SYing Zhang		Image offset to which the TPL should be padded before appending
31843aa29de0SYing Zhang		the TPL payload. By default, this is defined as
31853aa29de0SYing Zhang                CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
31863aa29de0SYing Zhang                CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
31873aa29de0SYing Zhang                payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
31883aa29de0SYing Zhang
3189c609719bSwdenkModem Support:
3190c609719bSwdenk--------------
3191c609719bSwdenk
3192566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
3193c609719bSwdenk
319411ccc33fSMarcel Ziswiler- Modem support enable:
3195c609719bSwdenk		CONFIG_MODEM_SUPPORT
3196c609719bSwdenk
3197c609719bSwdenk- RTS/CTS Flow control enable:
3198c609719bSwdenk		CONFIG_HWFLOW
3199c609719bSwdenk
3200c609719bSwdenk- Modem debug support:
3201c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
3202c609719bSwdenk
3203c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
3204c609719bSwdenk		for modem support. Useful only with BDI2000.
3205c609719bSwdenk
3206a8c7c708Swdenk- Interrupt support (PPC):
3207a8c7c708Swdenk
3208a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
3209a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
321011ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
3211a8c7c708Swdenk		should set decrementer_count to appropriate value. If
321211ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
3213a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
321411ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
3215a8c7c708Swdenk		specific handling. If board has watchdog / status_led
3216a8c7c708Swdenk		/ other_activity_monitor it works automatically from
3217a8c7c708Swdenk		general timer_interrupt().
3218a8c7c708Swdenk
3219c609719bSwdenk- General:
3220c609719bSwdenk
3221c609719bSwdenk		In the target system modem support is enabled when a
3222c609719bSwdenk		specific key (key combination) is pressed during
3223c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
322411ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
3225c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
3226c609719bSwdenk		function, returning 1 and thus enabling modem
3227c609719bSwdenk		initialization.
3228c609719bSwdenk
3229c609719bSwdenk		If there are no modem init strings in the
3230c609719bSwdenk		environment, U-Boot proceed to autoboot; the
3231c609719bSwdenk		previous output (banner, info printfs) will be
323211ccc33fSMarcel Ziswiler		suppressed, though.
3233c609719bSwdenk
3234c609719bSwdenk		See also: doc/README.Modem
3235c609719bSwdenk
32369660e442SHelmut RaigerBoard initialization settings:
32379660e442SHelmut Raiger------------------------------
32389660e442SHelmut Raiger
32399660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
32409660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
32419660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
32429660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
32439660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
32449660e442SHelmut Raigertypically in board_init_f() and board_init_r().
32459660e442SHelmut Raiger
32469660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
32479660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
32489660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
32499660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3250c609719bSwdenk
3251c609719bSwdenkConfiguration Settings:
3252c609719bSwdenk-----------------------
3253c609719bSwdenk
32546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3255c609719bSwdenk		undefine this when you're short of memory.
3256c609719bSwdenk
32572fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
32582fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
32592fb2604dSPeter Tyser
32606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
3261c609719bSwdenk		prompt for user input.
3262c609719bSwdenk
32636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
3264c609719bSwdenk
32656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
3266c609719bSwdenk
32676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
3268c609719bSwdenk
32696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3270c609719bSwdenk		the application (usually a Linux kernel) when it is
3271c609719bSwdenk		booted
3272c609719bSwdenk
32736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
3274c609719bSwdenk		List of legal baudrate settings for this board.
3275c609719bSwdenk
32766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
3277c609719bSwdenk		Suppress display of console information at boot.
3278c609719bSwdenk
32796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
3280c609719bSwdenk		If the board specific function
3281c609719bSwdenk			extern int overwrite_console (void);
3282c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
3283c609719bSwdenk		serial port, else the settings in the environment are used.
3284c609719bSwdenk
32856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3286c609719bSwdenk		Enable the call to overwrite_console().
3287c609719bSwdenk
32886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3289c609719bSwdenk		Enable overwrite of previous console environment settings.
3290c609719bSwdenk
32916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3292c609719bSwdenk		Begin and End addresses of the area used by the
3293c609719bSwdenk		simple memory test.
3294c609719bSwdenk
32956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
3296c609719bSwdenk		Enable an alternate, more extensive memory test.
3297c609719bSwdenk
32986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
32995f535fe1Swdenk		Scratch address used by the alternate memory test
33005f535fe1Swdenk		You only need to set this if address zero isn't writeable
33015f535fe1Swdenk
33026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
33036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
330414f73ca6SStefan Roese		this specified memory area will get subtracted from the top
330511ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
330614f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
330714f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
330814f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
33095e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
331014f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
33115e12e75dSStefan Roese		will have to get fixed in Linux additionally.
331214f73ca6SStefan Roese
331314f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
331414f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
331514f73ca6SStefan Roese		be touched.
331614f73ca6SStefan Roese
331714f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
331814f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
331914f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
332014f73ca6SStefan Roese		non page size aligned address and this could cause major
332114f73ca6SStefan Roese		problems.
332214f73ca6SStefan Roese
33236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
3324c609719bSwdenk		Enable temporary baudrate change while serial download
3325c609719bSwdenk
33266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
3327c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
3328c609719bSwdenk
33296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
3330c609719bSwdenk		Physical start address of Motherboard I/O (if using a
3331c609719bSwdenk		Cogent motherboard)
3332c609719bSwdenk
33336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
3334c609719bSwdenk		Physical start address of Flash memory.
3335c609719bSwdenk
33366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
3337c609719bSwdenk		Physical start address of boot monitor code (set by
3338c609719bSwdenk		make config files to be same as the text base address
333914d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
33406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
3341c609719bSwdenk
33426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
33433b57fe0aSwdenk		Size of memory reserved for monitor code, used to
33443b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
33453b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
33463b57fe0aSwdenk		flash sector.
3347c609719bSwdenk
33486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
3349c609719bSwdenk		Size of DRAM reserved for malloc() use.
3350c609719bSwdenk
33516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
335215940c9aSStefan Roese		Normally compressed uImages are limited to an
335315940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
33546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
335515940c9aSStefan Roese		to adjust this setting to your needs.
3356c609719bSwdenk
33576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
3358c609719bSwdenk		Maximum size of memory mapped by the startup code of
3359c609719bSwdenk		the Linux kernel; all data that must be processed by
33607d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
33617d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
33627d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
33637d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
3364c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
3365c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
3366c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
3367c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
3368c609719bSwdenk
3369fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3370fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
3371fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
3372fca43cc8SJohn Rigby		is enabled.
3373fca43cc8SJohn Rigby
3374fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3375fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3376fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3377fca43cc8SJohn Rigby
3378fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3379fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3380fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3381fca43cc8SJohn Rigby
33826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3383c609719bSwdenk		Max number of Flash memory banks
3384c609719bSwdenk
33856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3386c609719bSwdenk		Max number of sectors on a Flash chip
3387c609719bSwdenk
33886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3389c609719bSwdenk		Timeout for Flash erase operations (in ms)
3390c609719bSwdenk
33916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3392c609719bSwdenk		Timeout for Flash write operations (in ms)
3393c609719bSwdenk
33946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
33958564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
33968564acf9Swdenk
33976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
33988564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
33998564acf9Swdenk
34006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
34018564acf9Swdenk		If defined, hardware flash sectors protection is used
34028564acf9Swdenk		instead of U-Boot software protection.
34038564acf9Swdenk
34046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3405c609719bSwdenk
3406c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3407c609719bSwdenk		without this option such a download has to be
3408c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3409c609719bSwdenk		copy from RAM to flash.
3410c609719bSwdenk
3411c609719bSwdenk		The two-step approach is usually more reliable, since
3412c609719bSwdenk		you can check if the download worked before you erase
341311ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
341411ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3415c609719bSwdenk		downloaded image) this option may be very useful.
3416c609719bSwdenk
34176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3418c609719bSwdenk		Define if the flash driver uses extra elements in the
34195653fc33Swdenk		common flash structure for storing flash geometry.
34205653fc33Swdenk
342100b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
34225653fc33Swdenk		This option also enables the building of the cfi_flash driver
34235653fc33Swdenk		in the drivers directory
342453cf9435Sstroese
342591809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
342691809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
342791809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
342891809ed5SPiotr Ziecik		to the MTD layer.
342991809ed5SPiotr Ziecik
34306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
343196ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
343296ef831fSGuennadi Liakhovetski
343396ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
343496ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
343596ef831fSGuennadi Liakhovetski		write commands.
343696ef831fSGuennadi Liakhovetski
34376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
34385568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
34395568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
34405568e613SStefan Roese		is useful, if some of the configured banks are only
34415568e613SStefan Roese		optionally available.
34425568e613SStefan Roese
34439a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
34449a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
34459a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
34469a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
34479a042e9cSJerry Van Baren
3448352ef3f1SStefan Roese- CONFIG_FLASH_VERIFY
3449352ef3f1SStefan Roese		If defined, the content of the flash (destination) is compared
3450352ef3f1SStefan Roese		against the source after the write operation. An error message
3451352ef3f1SStefan Roese		will be printed when the contents are not identical.
3452352ef3f1SStefan Roese		Please note that this option is useless in nearly all cases,
3453352ef3f1SStefan Roese		since such flash programming errors usually are detected earlier
3454352ef3f1SStefan Roese		while unprotecting/erasing/programming. Please only enable
3455352ef3f1SStefan Roese		this option if you really know what you are doing.
3456352ef3f1SStefan Roese
34576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
345811ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
345911ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
346053cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
346153cf9435Sstroese		buffers can be full shortly after enabling the interface
346211ccc33fSMarcel Ziswiler		on high Ethernet traffic.
346353cf9435Sstroese		Defaults to 4 if not defined.
3464c609719bSwdenk
3465ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3466ea882bafSWolfgang Denk
3467ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3468ea882bafSWolfgang Denk	internally to store the environment settings. The default
3469ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3470ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3471ea882bafSWolfgang Denk	lib/hashtable.c for details.
3472ea882bafSWolfgang Denk
34732598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_DEFAULT
34742598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_STATIC
34752598090bSJoe Hershberger	Enable validation of the values given to enviroment variables when
34762598090bSJoe Hershberger	calling env set.  Variables can be restricted to only decimal,
34772598090bSJoe Hershberger	hexadecimal, or boolean.  If CONFIG_CMD_NET is also defined,
34782598090bSJoe Hershberger	the variables can also be restricted to IP address or MAC address.
34792598090bSJoe Hershberger
34802598090bSJoe Hershberger	The format of the list is:
34812598090bSJoe Hershberger		type_attribute = [s|d|x|b|i|m]
3482267541f7SJoe Hershberger		access_atribute = [a|r|o|c]
3483267541f7SJoe Hershberger		attributes = type_attribute[access_atribute]
34842598090bSJoe Hershberger		entry = variable_name[:attributes]
34852598090bSJoe Hershberger		list = entry[,list]
34862598090bSJoe Hershberger
34872598090bSJoe Hershberger	The type attributes are:
34882598090bSJoe Hershberger		s - String (default)
34892598090bSJoe Hershberger		d - Decimal
34902598090bSJoe Hershberger		x - Hexadecimal
34912598090bSJoe Hershberger		b - Boolean ([1yYtT|0nNfF])
34922598090bSJoe Hershberger		i - IP address
34932598090bSJoe Hershberger		m - MAC address
34942598090bSJoe Hershberger
3495267541f7SJoe Hershberger	The access attributes are:
3496267541f7SJoe Hershberger		a - Any (default)
3497267541f7SJoe Hershberger		r - Read-only
3498267541f7SJoe Hershberger		o - Write-once
3499267541f7SJoe Hershberger		c - Change-default
3500267541f7SJoe Hershberger
35012598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_DEFAULT
35022598090bSJoe Hershberger		Define this to a list (string) to define the ".flags"
35032598090bSJoe Hershberger		envirnoment variable in the default or embedded environment.
35042598090bSJoe Hershberger
35052598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_STATIC
35062598090bSJoe Hershberger		Define this to a list (string) to define validation that
35072598090bSJoe Hershberger		should be done if an entry is not found in the ".flags"
35082598090bSJoe Hershberger		environment variable.  To override a setting in the static
35092598090bSJoe Hershberger		list, simply add an entry for the same variable name to the
35102598090bSJoe Hershberger		".flags" variable.
35112598090bSJoe Hershberger
3512267541f7SJoe Hershberger- CONFIG_ENV_ACCESS_IGNORE_FORCE
3513267541f7SJoe Hershberger	If defined, don't allow the -f switch to env set override variable
3514267541f7SJoe Hershberger	access flags.
3515267541f7SJoe Hershberger
35165c1a7ea6SSimon Glass- CONFIG_SYS_GENERIC_BOARD
35175c1a7ea6SSimon Glass	This selects the architecture-generic board system instead of the
35185c1a7ea6SSimon Glass	architecture-specific board files. It is intended to move boards
35195c1a7ea6SSimon Glass	to this new framework over time. Defining this will disable the
35205c1a7ea6SSimon Glass	arch/foo/lib/board.c file and use common/board_f.c and
35215c1a7ea6SSimon Glass	common/board_r.c instead. To use this option your architecture
35225c1a7ea6SSimon Glass	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
35235c1a7ea6SSimon Glass	its config.mk file). If you find problems enabling this option on
35245c1a7ea6SSimon Glass	your board please report the problem and send patches!
35255c1a7ea6SSimon Glass
3526632efa74SSimon Glass- CONFIG_SYS_SYM_OFFSETS
3527632efa74SSimon Glass	This is set by architectures that use offsets for link symbols
3528632efa74SSimon Glass	instead of absolute values. So bss_start is obtained using an
3529632efa74SSimon Glass	offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
3530632efa74SSimon Glass	directly. You should not need to touch this setting.
3531632efa74SSimon Glass
35320b1b60c7SLokesh Vutla- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
35330b1b60c7SLokesh Vutla	This is set by OMAP boards for the max time that reset should
35340b1b60c7SLokesh Vutla	be asserted. See doc/README.omap-reset-time for details on how
35350b1b60c7SLokesh Vutla	the value can be calulated on a given board.
3536632efa74SSimon Glass
3537c609719bSwdenkThe following definitions that deal with the placement and management
3538c609719bSwdenkof environment data (variable area); in general, we support the
3539c609719bSwdenkfollowing configurations:
3540c609719bSwdenk
3541c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3542c3eb3fe4SMike Frysinger
3543c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3544c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3545c3eb3fe4SMike Frysinger
35465a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3547c609719bSwdenk
3548c609719bSwdenk	Define this if the environment is in flash memory.
3549c609719bSwdenk
3550c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3551c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3552c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3553c609719bSwdenk	   sector" type flash chips, which have several smaller
3554c609719bSwdenk	   sectors at the start or the end. For instance, such a
3555c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3556c609719bSwdenk	   such a case you would place the environment in one of the
3557c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3558c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3559c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3560c609719bSwdenk	   between U-Boot and the environment.
3561c609719bSwdenk
35620e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3563c609719bSwdenk
3564c609719bSwdenk	   Offset of environment data (variable area) to the
3565c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3566c609719bSwdenk	   type flash chips the second sector can be used: the offset
3567c609719bSwdenk	   for this sector is given here.
3568c609719bSwdenk
35696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3570c609719bSwdenk
35710e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3572c609719bSwdenk
3573c609719bSwdenk	   This is just another way to specify the start address of
3574c609719bSwdenk	   the flash sector containing the environment (instead of
35750e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3576c609719bSwdenk
35770e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3578c609719bSwdenk
3579c609719bSwdenk	   Size of the sector containing the environment.
3580c609719bSwdenk
3581c609719bSwdenk
3582c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3583c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3584c609719bSwdenk	   the environment.
3585c609719bSwdenk
35860e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3587c609719bSwdenk
35885a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
35890e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3590c609719bSwdenk	   of this flash sector for the environment. This saves
3591c609719bSwdenk	   memory for the RAM copy of the environment.
3592c609719bSwdenk
3593c609719bSwdenk	   It may also save flash memory if you decide to use this
3594c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3595c609719bSwdenk	   since then the remainder of the flash sector could be used
3596c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3597c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3598c609719bSwdenk	   updating the environment in flash makes it always
3599c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3600c609719bSwdenk	   wrong before the contents has been restored from a copy in
3601c609719bSwdenk	   RAM, your target system will be dead.
3602c609719bSwdenk
36030e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
36040e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3605c609719bSwdenk
3606c609719bSwdenk	   These settings describe a second storage area used to hold
360711ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
36083e38691eSwdenk	   a valid backup copy in case there is a power failure during
3609c609719bSwdenk	   a "saveenv" operation.
3610c609719bSwdenk
3611c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3612c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3613c609719bSwdenkaccordingly!
3614c609719bSwdenk
3615c609719bSwdenk
36169314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3617c609719bSwdenk
3618c609719bSwdenk	Define this if you have some non-volatile memory device
3619c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3620c609719bSwdenk	environment.
3621c609719bSwdenk
36220e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
36230e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3624c609719bSwdenk
362511ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3626c609719bSwdenk	  want to use for environment. It is assumed that this memory
3627c609719bSwdenk	  can just be read and written to, without any special
3628c609719bSwdenk	  provision.
3629c609719bSwdenk
3630c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3631c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
363211ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3633c609719bSwdenkU-Boot will hang.
3634c609719bSwdenk
3635c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3636c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3637c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3638c609719bSwdenkto save the current settings.
3639c609719bSwdenk
3640c609719bSwdenk
3641bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3642c609719bSwdenk
3643c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3644c609719bSwdenk	device and a driver for it.
3645c609719bSwdenk
36460e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
36470e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3648c609719bSwdenk
3649c609719bSwdenk	  These two #defines specify the offset and size of the
3650c609719bSwdenk	  environment area within the total memory of your EEPROM.
3651c609719bSwdenk
36526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3653c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3654c609719bSwdenk	  The default address is zero.
3655c609719bSwdenk
36566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3657c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3658c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3659c609719bSwdenk	  would require six bits.
3660c609719bSwdenk
36616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3662c609719bSwdenk	  If defined, the number of milliseconds to delay between
3663c609719bSwdenk	  page writes.	The default is zero milliseconds.
3664c609719bSwdenk
36656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3666c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3667c609719bSwdenk	  that this is NOT the chip address length!
3668c609719bSwdenk
36696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
36705cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
36715cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
36725cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
36735cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
36745cf91d6bSwdenk	  byte chips.
36755cf91d6bSwdenk
36765cf91d6bSwdenk	  Note that we consider the length of the address field to
36775cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
36785cf91d6bSwdenk	  in the chip address.
36795cf91d6bSwdenk
36806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3681c609719bSwdenk	  The size in bytes of the EEPROM device.
3682c609719bSwdenk
3683548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3684548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3685548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3686548738b4SHeiko Schocher
3687548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3688548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3689548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3690548738b4SHeiko Schocher	  EEPROM. For example:
3691548738b4SHeiko Schocher
3692ea818dbbSHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  1
3693548738b4SHeiko Schocher
3694548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3695548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3696c609719bSwdenk
3697057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
36985779d8d9Swdenk
36995779d8d9Swdenk	Define this if you have a DataFlash memory device which you
37005779d8d9Swdenk	want to use for the environment.
37015779d8d9Swdenk
37020e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
37030e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
37040e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
37055779d8d9Swdenk
37065779d8d9Swdenk	  These three #defines specify the offset and size of the
37075779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
37085779d8d9Swdenk	  at the specified address.
37095779d8d9Swdenk
37100a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
37110a85a9e7SLiu Gang
37120a85a9e7SLiu Gang	Define this if you have a remote memory space which you
37130a85a9e7SLiu Gang	want to use for the local device's environment.
37140a85a9e7SLiu Gang
37150a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
37160a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
37170a85a9e7SLiu Gang
37180a85a9e7SLiu Gang	  These two #defines specify the address and size of the
37190a85a9e7SLiu Gang	  environment area within the remote memory space. The
37200a85a9e7SLiu Gang	  local device can get the environment from remote memory
3721fc54c7faSLiu Gang	  space by SRIO or PCIE links.
37220a85a9e7SLiu Gang
37230a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
37240a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3725fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3726fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
37270a85a9e7SLiu Gang
372851bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
372913a5695bSwdenk
373013a5695bSwdenk	Define this if you have a NAND device which you want to use
373113a5695bSwdenk	for the environment.
373213a5695bSwdenk
37330e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
37340e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
373513a5695bSwdenk
373613a5695bSwdenk	  These two #defines specify the offset and size of the environment
3737fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3738fdd813deSScott Wood	  aligned to an erase block boundary.
37395779d8d9Swdenk
3740fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3741e443c944SMarkus Klotzbuecher
37420e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3743fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3744fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3745fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3746fdd813deSScott Wood	  aligned to an erase block boundary.
3747e443c944SMarkus Klotzbuecher
3748fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3749fdd813deSScott Wood
3750fdd813deSScott Wood	  Specifies the length of the region in which the environment
3751fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3752fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3753fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3754fdd813deSScott Wood	  the range to be avoided.
3755fdd813deSScott Wood
3756fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3757fdd813deSScott Wood
3758fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3759fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3760fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3761fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3762fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3763e443c944SMarkus Klotzbuecher
3764b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3765b74ab737SGuennadi Liakhovetski
3766b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3767b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3768b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3769b74ab737SGuennadi Liakhovetski
37702b74433fSJoe Hershberger- CONFIG_ENV_IS_IN_UBI:
37712b74433fSJoe Hershberger
37722b74433fSJoe Hershberger	Define this if you have an UBI volume that you want to use for the
37732b74433fSJoe Hershberger	environment.  This has the benefit of wear-leveling the environment
37742b74433fSJoe Hershberger	accesses, which is important on NAND.
37752b74433fSJoe Hershberger
37762b74433fSJoe Hershberger	- CONFIG_ENV_UBI_PART:
37772b74433fSJoe Hershberger
37782b74433fSJoe Hershberger	  Define this to a string that is the mtd partition containing the UBI.
37792b74433fSJoe Hershberger
37802b74433fSJoe Hershberger	- CONFIG_ENV_UBI_VOLUME:
37812b74433fSJoe Hershberger
37822b74433fSJoe Hershberger	  Define this to the name of the volume that you want to store the
37832b74433fSJoe Hershberger	  environment in.
37842b74433fSJoe Hershberger
3785785881f7SJoe Hershberger	- CONFIG_ENV_UBI_VOLUME_REDUND:
3786785881f7SJoe Hershberger
3787785881f7SJoe Hershberger	  Define this to the name of another volume to store a second copy of
3788785881f7SJoe Hershberger	  the environment in.  This will enable redundant environments in UBI.
3789785881f7SJoe Hershberger	  It is assumed that both volumes are in the same MTD partition.
3790785881f7SJoe Hershberger
37912b74433fSJoe Hershberger	- CONFIG_UBI_SILENCE_MSG
37922b74433fSJoe Hershberger	- CONFIG_UBIFS_SILENCE_MSG
37932b74433fSJoe Hershberger
37942b74433fSJoe Hershberger	  You will probably want to define these to avoid a really noisy system
37952b74433fSJoe Hershberger	  when storing the env in UBI.
37962b74433fSJoe Hershberger
379706e4ae5fSStephen Warren- CONFIG_ENV_IS_IN_MMC:
379806e4ae5fSStephen Warren
379906e4ae5fSStephen Warren	Define this if you have an MMC device which you want to use for the
380006e4ae5fSStephen Warren	environment.
380106e4ae5fSStephen Warren
380206e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_DEV:
380306e4ae5fSStephen Warren
380406e4ae5fSStephen Warren	  Specifies which MMC device the environment is stored in.
380506e4ae5fSStephen Warren
380606e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_PART (optional):
380706e4ae5fSStephen Warren
380806e4ae5fSStephen Warren	  Specifies which MMC partition the environment is stored in. If not
380906e4ae5fSStephen Warren	  set, defaults to partition 0, the user area. Common values might be
381006e4ae5fSStephen Warren	  1 (first MMC boot partition), 2 (second MMC boot partition).
381106e4ae5fSStephen Warren
381206e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET:
381306e4ae5fSStephen Warren	- CONFIG_ENV_SIZE:
381406e4ae5fSStephen Warren
381506e4ae5fSStephen Warren	  These two #defines specify the offset and size of the environment
381606e4ae5fSStephen Warren	  area within the specified MMC device.
381706e4ae5fSStephen Warren
38185c088ee8SStephen Warren	  If offset is positive (the usual case), it is treated as relative to
38195c088ee8SStephen Warren	  the start of the MMC partition. If offset is negative, it is treated
38205c088ee8SStephen Warren	  as relative to the end of the MMC partition. This can be useful if
38215c088ee8SStephen Warren	  your board may be fitted with different MMC devices, which have
38225c088ee8SStephen Warren	  different sizes for the MMC partitions, and you always want the
38235c088ee8SStephen Warren	  environment placed at the very end of the partition, to leave the
38245c088ee8SStephen Warren	  maximum possible space before it, to store other data.
38255c088ee8SStephen Warren
382606e4ae5fSStephen Warren	  These two values are in units of bytes, but must be aligned to an
382706e4ae5fSStephen Warren	  MMC sector boundary.
382806e4ae5fSStephen Warren
382906e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET_REDUND (optional):
383006e4ae5fSStephen Warren
383106e4ae5fSStephen Warren	  Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
383206e4ae5fSStephen Warren	  hold a redundant copy of the environment data. This provides a
383306e4ae5fSStephen Warren	  valid backup copy in case the other copy is corrupted, e.g. due
383406e4ae5fSStephen Warren	  to a power failure during a "saveenv" operation.
383506e4ae5fSStephen Warren
38365c088ee8SStephen Warren	  This value may also be positive or negative; this is handled in the
38375c088ee8SStephen Warren	  same way as CONFIG_ENV_OFFSET.
38385c088ee8SStephen Warren
383906e4ae5fSStephen Warren	  This value is also in units of bytes, but must also be aligned to
384006e4ae5fSStephen Warren	  an MMC sector boundary.
384106e4ae5fSStephen Warren
384206e4ae5fSStephen Warren	- CONFIG_ENV_SIZE_REDUND (optional):
384306e4ae5fSStephen Warren
384406e4ae5fSStephen Warren	  This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
384506e4ae5fSStephen Warren	  set. If this value is set, it must be set to the same value as
384606e4ae5fSStephen Warren	  CONFIG_ENV_SIZE.
384706e4ae5fSStephen Warren
38486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3849c609719bSwdenk
3850c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3851c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3852c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3853c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3854c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3855c609719bSwdenk	to be a good choice since it makes it far enough from the
3856c609719bSwdenk	start of the data area as well as from the stack pointer.
3857c609719bSwdenk
3858e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3859c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3860cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3861c609719bSwdenkuntil then to read environment variables.
3862c609719bSwdenk
386385ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
386485ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
386585ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
386685ec0bccSwdenknecessary, because the first environment variable we need is the
386785ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
386885ec0bccSwdenkhave any device yet where we could complain.]
3869c609719bSwdenk
3870c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3871c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
387285ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3873c609719bSwdenk
38746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3875fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3876fc3e2165Swdenk
38776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3878fc3e2165Swdenk		      also needs to be defined.
3879fc3e2165Swdenk
38806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3881fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3882c609719bSwdenk
3883f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3884f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3885f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3886f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3887f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3888f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3889f5675aa5SRon Madrid
3890b2b92f53SSimon Glass- CONFIG_DISPLAY_BOARDINFO
3891b2b92f53SSimon Glass		Display information about the board that U-Boot is running on
3892b2b92f53SSimon Glass		when U-Boot starts up. The board function checkboard() is called
3893b2b92f53SSimon Glass		to do this.
3894b2b92f53SSimon Glass
3895e2e3e2b1SSimon Glass- CONFIG_DISPLAY_BOARDINFO_LATE
3896e2e3e2b1SSimon Glass		Similar to the previous option, but display this information
3897e2e3e2b1SSimon Glass		later, once stdio is running and output goes to the LCD, if
3898e2e3e2b1SSimon Glass		present.
3899e2e3e2b1SSimon Glass
3900c609719bSwdenkLow Level (hardware related) configuration options:
3901dc7c9a1aSwdenk---------------------------------------------------
3902c609719bSwdenk
39036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3904c609719bSwdenk		Cache Line Size of the CPU.
3905c609719bSwdenk
39066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3907c609719bSwdenk		Default address of the IMMR after system reset.
39082535d602Swdenk
39092535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
39102535d602Swdenk		and RPXsuper) to be able to adjust the position of
39112535d602Swdenk		the IMMR register after a reset.
3912c609719bSwdenk
3913e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3914e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3915e46fedfeSTimur Tabi		PowerPC SOCs.
3916e46fedfeSTimur Tabi
3917e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3918e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3919e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3920e46fedfeSTimur Tabi
3921e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3922e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3923e46fedfeSTimur Tabi
3924e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3925e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3926e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3927e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3928e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3929e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3930e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3931e46fedfeSTimur Tabi
3932e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3933e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3934e46fedfeSTimur Tabi
3935e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3936e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3937e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3938e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3939e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3940e46fedfeSTimur Tabi
3941e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3942e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3943e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3944e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3945e46fedfeSTimur Tabi
3946e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3947e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3948e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3949e46fedfeSTimur Tabi
39507f6c2cbcSwdenk- Floppy Disk Support:
39516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
39527f6c2cbcSwdenk
39537f6c2cbcSwdenk		the default drive number (default value 0)
39547f6c2cbcSwdenk
39556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
39567f6c2cbcSwdenk
395711ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
39587f6c2cbcSwdenk		(default value 1)
39597f6c2cbcSwdenk
39606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
39617f6c2cbcSwdenk
39627f6c2cbcSwdenk		defines the offset of register from address. It
39637f6c2cbcSwdenk		depends on which part of the data bus is connected to
396411ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
39657f6c2cbcSwdenk
39666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
39676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
39687f6c2cbcSwdenk		default value.
39697f6c2cbcSwdenk
39706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
39717f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
39727f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
39737f6c2cbcSwdenk		source code. It is used to make hardware dependant
39747f6c2cbcSwdenk		initializations.
39757f6c2cbcSwdenk
39760abddf82SMacpaul Lin- CONFIG_IDE_AHB:
39770abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
39780abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
39790abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
39800abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
39810abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
39820abddf82SMacpaul Lin		is requierd.
39830abddf82SMacpaul Lin
39846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
398525d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
398625d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3987c609719bSwdenk
39886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3989c609719bSwdenk
39907152b1d0Swdenk		Start address of memory area that can be used for
3991c609719bSwdenk		initial data and stack; please note that this must be
3992c609719bSwdenk		writable memory that is working WITHOUT special
3993c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3994c609719bSwdenk		will become available only after programming the
3995c609719bSwdenk		memory controller and running certain initialization
3996c609719bSwdenk		sequences.
3997c609719bSwdenk
3998c609719bSwdenk		U-Boot uses the following memory types:
3999c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
4000c609719bSwdenk		- MPC824X: data cache
4001c609719bSwdenk		- PPC4xx:  data cache
4002c609719bSwdenk
40036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
4004c609719bSwdenk
4005c609719bSwdenk		Offset of the initial data structure in the memory
40066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
40076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
4008c609719bSwdenk		data is located at the end of the available space
4009553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
40106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
40116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
40126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
4013c609719bSwdenk
4014c609719bSwdenk	Note:
4015c609719bSwdenk		On the MPC824X (or other systems that use the data
4016c609719bSwdenk		cache for initial memory) the address chosen for
40176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
4018c609719bSwdenk		point to an otherwise UNUSED address space between
4019c609719bSwdenk		the top of RAM and the start of the PCI space.
4020c609719bSwdenk
40216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
4022c609719bSwdenk
40236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
4024c609719bSwdenk
40256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
4026c609719bSwdenk
40276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
4028c609719bSwdenk
40296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
4030c609719bSwdenk
40316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
4032c609719bSwdenk
40336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
4034c609719bSwdenk		SDRAM timing
4035c609719bSwdenk
40366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
4037c609719bSwdenk		periodic timer for refresh
4038c609719bSwdenk
40396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
4040c609719bSwdenk
40416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
40426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
40436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
40446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
4045c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
4046c609719bSwdenk
4047c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
40486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
40496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
4050c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
4051c609719bSwdenk
40526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
40536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
4054c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
4055c609719bSwdenk		Prescaler definitions (SDRAM timing)
4056c609719bSwdenk
40576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
4058c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
4059c609719bSwdenk		define relocation offset in DPRAM [DSP2]
4060c609719bSwdenk
40616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
4062b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
4063b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
4064b423d055SHeiko Schocher
40656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
4066c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
4067c609719bSwdenk		define relocation offset in DPRAM [SCC4]
4068c609719bSwdenk
40696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
4070c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
4071c609719bSwdenk		wrong setting might damage your board. Read
4072c609719bSwdenk		doc/README.MBX before setting this variable!
4073c609719bSwdenk
40746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
4075ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
4076ea909b76Swdenk		(Power On Self Tests). This definition overrides
4077ea909b76Swdenk		#define'd default value in commproc.h resp.
4078ea909b76Swdenk		cpm_8260.h.
4079ea909b76Swdenk
40806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
40816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
40826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
40836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
40846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
40856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
40866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
40876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
4088a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
40895d232d0eSwdenk
40909cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
40919cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
40929cacf4fcSDirk Eibach		required.
40939cacf4fcSDirk Eibach
409469fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
409569fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
409669fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
409769fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
409869fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
409969fd2d3bSAndrew Sharp		by coreboot or similar.
410069fd2d3bSAndrew Sharp
4101842033e6SGabor Juhos- CONFIG_PCI_INDIRECT_BRIDGE:
4102842033e6SGabor Juhos		Enable support for indirect PCI bridges.
4103842033e6SGabor Juhos
4104a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
4105a09b9b68SKumar Gala		Chip has SRIO or not
4106a09b9b68SKumar Gala
4107a09b9b68SKumar Gala- CONFIG_SRIO1:
4108a09b9b68SKumar Gala		Board has SRIO 1 port available
4109a09b9b68SKumar Gala
4110a09b9b68SKumar Gala- CONFIG_SRIO2:
4111a09b9b68SKumar Gala		Board has SRIO 2 port available
4112a09b9b68SKumar Gala
4113c8b28152SLiu Gang- CONFIG_SRIO_PCIE_BOOT_MASTER
4114c8b28152SLiu Gang		Board can support master function for Boot from SRIO and PCIE
4115c8b28152SLiu Gang
4116a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
4117a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
4118a09b9b68SKumar Gala
4119a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
4120a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
4121a09b9b68SKumar Gala
4122a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
4123a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
4124a09b9b68SKumar Gala
412566bd1846SFabio Estevam- CONFIG_SYS_NAND_BUSWIDTH_16BIT
412666bd1846SFabio Estevam		Defined to tell the NAND controller that the NAND chip is using
412766bd1846SFabio Estevam		a 16 bit bus.
412866bd1846SFabio Estevam		Not all NAND drivers use this symbol.
4129a430e916SFabio Estevam		Example of drivers that use it:
413066bd1846SFabio Estevam		- drivers/mtd/nand/ndfc.c
4131a430e916SFabio Estevam		- drivers/mtd/nand/mxc_nand.c
4132eced4626SAlex Waterman
4133eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
4134eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
4135eced4626SAlex Waterman		a default value will be used.
4136eced4626SAlex Waterman
4137bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
4138218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
4139218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
4140218ca724SWolfgang Denk
4141bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
4142bb99ad6dSBen Warren		I2C address of the SPD EEPROM
4143bb99ad6dSBen Warren
41446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
4145218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
4146218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
4147218ca724SWolfgang Denk		to something your driver can deal with.
4148bb99ad6dSBen Warren
41491b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
41501b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
41511b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
41521b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
41531b3e3c4fSYork Sun		header files or board specific files.
41541b3e3c4fSYork Sun
41556f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
41566f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
41576f5e1dc5SYork Sun
41586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
4159218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
4160218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
41612ad6b513STimur Tabi
4162c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
4163c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
4164c26e454dSwdenk
4165c26e454dSwdenk- CONFIG_FEC[12]_PHY
4166c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
41676e592385Swdenk		to the given FEC; i. e.
4168c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
4169c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
4170c26e454dSwdenk
4171c26e454dSwdenk		When set to -1, means to probe for first available.
4172c26e454dSwdenk
4173c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
4174c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
4175c26e454dSwdenk		(so program the FEC to ignore it).
4176c26e454dSwdenk
4177c26e454dSwdenk- CONFIG_RMII
4178c26e454dSwdenk		Enable RMII mode for all FECs.
4179c26e454dSwdenk		Note that this is a global option, we can't
4180c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
4181c26e454dSwdenk
41825cf91d6bSwdenk- CONFIG_CRC32_VERIFY
41835cf91d6bSwdenk		Add a verify option to the crc32 command.
41845cf91d6bSwdenk		The syntax is:
41855cf91d6bSwdenk
41865cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
41875cf91d6bSwdenk
41885cf91d6bSwdenk		Where address/count indicate a memory area
41895cf91d6bSwdenk		and crc32 is the correct crc32 which the
41905cf91d6bSwdenk		area should have.
41915cf91d6bSwdenk
419256523f12Swdenk- CONFIG_LOOPW
419356523f12Swdenk		Add the "loopw" memory command. This only takes effect if
4194602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
419556523f12Swdenk
41967b466641Sstroese- CONFIG_MX_CYCLIC
41977b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
41987b466641Sstroese		"md/mw" commands.
41997b466641Sstroese		Examples:
42007b466641Sstroese
42017b466641Sstroese		=> mdc.b 10 4 500
42027b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
42037b466641Sstroese
42047b466641Sstroese		=> mwc.l 100 12345678 10
42057b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
42067b466641Sstroese
42077b466641Sstroese		This only takes effect if the memory commands are activated
4208602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
42097b466641Sstroese
42108aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
4211afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
4212e03f3169SWolfgang Denk		low level initializations (like setting up the memory
4213e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
4214e03f3169SWolfgang Denk		relocate itself into RAM.
42158aa1a2d1Swdenk
4216e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
4217e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
4218e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
4219e03f3169SWolfgang Denk		these initializations itself.
42208aa1a2d1Swdenk
4221401bb30bSAneesh V- CONFIG_SPL_BUILD
4222df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
4223df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
4224df81238bSMagnus Lilja		compiling a NAND SPL.
4225400558b5Swdenk
42263aa29de0SYing Zhang- CONFIG_TPL_BUILD
42273aa29de0SYing Zhang		Modifies the behaviour of start.S  when compiling a loader
42283aa29de0SYing Zhang		that is executed after the SPL and before the actual U-Boot.
42293aa29de0SYing Zhang		It is loaded by the SPL.
42303aa29de0SYing Zhang
42315df572f0SYing Zhang- CONFIG_SYS_MPC85XX_NO_RESETVEC
42325df572f0SYing Zhang		Only for 85xx systems. If this variable is specified, the section
42335df572f0SYing Zhang		.resetvec is not kept and the section .bootpg is placed in the
42345df572f0SYing Zhang		previous 4k of the .text section.
42355df572f0SYing Zhang
42364213fc29SSimon Glass- CONFIG_ARCH_MAP_SYSMEM
42374213fc29SSimon Glass		Generally U-Boot (and in particular the md command) uses
42384213fc29SSimon Glass		effective address. It is therefore not necessary to regard
42394213fc29SSimon Glass		U-Boot address as virtual addresses that need to be translated
42404213fc29SSimon Glass		to physical addresses. However, sandbox requires this, since
42414213fc29SSimon Glass		it maintains its own little RAM buffer which contains all
42424213fc29SSimon Glass		addressable memory. This option causes some memory accesses
42434213fc29SSimon Glass		to be mapped through map_sysmem() / unmap_sysmem().
42444213fc29SSimon Glass
4245d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
4246d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
4247d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
4248d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
4249d8834a13SMatthias Weisser		conditions but may increase the binary size.
4250d8834a13SMatthias Weisser
4251588a13f7SSimon Glass- CONFIG_X86_RESET_VECTOR
4252588a13f7SSimon Glass		If defined, the x86 reset vector code is included. This is not
4253588a13f7SSimon Glass		needed when U-Boot is running from Coreboot.
4254b16f521aSGabe Black
4255fc33705eSMark Jackson- CONFIG_SYS_MPUCLK
4256fc33705eSMark Jackson		Defines the MPU clock speed (in MHz).
4257fc33705eSMark Jackson
4258fc33705eSMark Jackson		NOTE : currently only supported on AM335x platforms.
42595b5ece9eSGabe Black
4260f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
4261f2717b47STimur Tabi-----------------------------------
4262f2717b47STimur Tabi
4263f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4264f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
4265f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
4266f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
4267f2717b47STimur Tabiwithin that device.
4268f2717b47STimur Tabi
4269f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
4270f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
4271f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4272f2717b47STimur Tabi	is also specified.
4273f2717b47STimur Tabi
4274f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
4275f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
4276f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
4277f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
4278f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
4279f2717b47STimur Tabi
4280f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
4281f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4282f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
4283f2717b47STimur Tabi	virtual address in NOR flash.
4284f2717b47STimur Tabi
4285f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
4286f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
4287f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4288f2717b47STimur Tabi
4289f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
4290f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
4291f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4292f2717b47STimur Tabi
4293f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4294f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
4295f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4296f2717b47STimur Tabi
4297292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4298292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
4299292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4300fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4301fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
4302fc54c7faSLiu Gang	master's memory space.
4303f2717b47STimur Tabi
4304c609719bSwdenkBuilding the Software:
4305c609719bSwdenk======================
4306c609719bSwdenk
4307218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
4308218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
4309218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
4310218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
4311218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4312218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
4313c609719bSwdenk
4314218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
4315218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
4316218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
4317218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
4318218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
4319c609719bSwdenk
4320218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
4321218ca724SWolfgang Denk	$ export CROSS_COMPILE
4322c609719bSwdenk
43232f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
43242f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
43252f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
43262f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
43272f8d396bSPeter Tyser
43282f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
43292f8d396bSPeter Tyser
43302f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
43312f8d396bSPeter Tyser      be executed on computers running Windows.
43322f8d396bSPeter Tyser
4333c609719bSwdenkU-Boot is intended to be simple to build. After installing the
4334c609719bSwdenksources you must configure U-Boot for one specific board type. This
4335c609719bSwdenkis done by typing:
4336c609719bSwdenk
4337c609719bSwdenk	make NAME_config
4338c609719bSwdenk
4339218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
43404d675ae6SMichael Jonesrations; see boards.cfg for supported names.
434154387ac9Swdenk
4342c609719bSwdenkNote: for some board special configuration names may exist; check if
4343c609719bSwdenk      additional information is available from the board vendor; for
43442729af9dSwdenk      instance, the TQM823L systems are available without (standard)
43452729af9dSwdenk      or with LCD support. You can select such additional "features"
434611ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
4347c609719bSwdenk
43482729af9dSwdenk      make TQM823L_config
43492729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
4350c609719bSwdenk
4351c609719bSwdenk      make TQM823L_LCD_config
4352c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
4353c609719bSwdenk
4354c609719bSwdenk      etc.
4355c609719bSwdenk
4356c609719bSwdenk
4357c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
43587152b1d0Swdenkimages ready for download to / installation on your system:
4359c609719bSwdenk
4360c609719bSwdenk- "u-boot.bin" is a raw binary image
4361c609719bSwdenk- "u-boot" is an image in ELF binary format
4362c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
4363c609719bSwdenk
4364baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
4365baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
4366baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
4367baf31249SMarian Balakowicz
4368baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
4369baf31249SMarian Balakowicz
4370baf31249SMarian Balakowicz	make O=/tmp/build distclean
4371baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
4372baf31249SMarian Balakowicz	make O=/tmp/build all
4373baf31249SMarian Balakowicz
4374baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
4375baf31249SMarian Balakowicz
4376baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4377baf31249SMarian Balakowicz	make distclean
4378baf31249SMarian Balakowicz	make NAME_config
4379baf31249SMarian Balakowicz	make all
4380baf31249SMarian Balakowicz
4381baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
4382baf31249SMarian Balakowiczvariable.
4383baf31249SMarian Balakowicz
4384c609719bSwdenk
4385c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
4386c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
4387c609719bSwdenknative "make".
4388c609719bSwdenk
4389c609719bSwdenk
4390c609719bSwdenkIf the system board that you have is not listed, then you will need
4391c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
4392c609719bSwdenksteps:
4393c609719bSwdenk
4394c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
43954d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
43964d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
4397c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
439885ec0bccSwdenk    files you need. In your board directory, you will need at least
439985ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
440085ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
440185ec0bccSwdenk    your board
4402c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
4403c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
440485ec0bccSwdenk4.  Run "make <board>_config" with your new name.
4405c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
4406c609719bSwdenk    to be installed on your target system.
440785ec0bccSwdenk6.  Debug and solve any problems that might arise.
4408c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
4409c609719bSwdenk
4410c609719bSwdenk
4411c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
4412c609719bSwdenk==============================================================
4413c609719bSwdenk
4414c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
4415c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
4416c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
4417c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
4418218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
4419c609719bSwdenk
4420c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
4421c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
4422c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
4423c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
4424c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
44257152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
4426218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
4427218ca724SWolfgang Denkyou can type
4428c609719bSwdenk
4429c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
4430c609719bSwdenk
4431c609719bSwdenkor to build on a native PowerPC system you can type
4432c609719bSwdenk
4433c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
4434c609719bSwdenk
4435218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
4436218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
4437218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
4438218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
4439218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
4440218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
4441218ca724SWolfgang Denkvariable. For example:
4442baf31249SMarian Balakowicz
4443baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4444baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
4445baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
4446baf31249SMarian Balakowicz
4447218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
4448218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
4449218ca724SWolfgang Denkduring the whole build process.
4450baf31249SMarian Balakowicz
4451baf31249SMarian Balakowicz
4452c609719bSwdenkSee also "U-Boot Porting Guide" below.
4453c609719bSwdenk
4454c609719bSwdenk
4455c609719bSwdenkMonitor Commands - Overview:
4456c609719bSwdenk============================
4457c609719bSwdenk
4458c609719bSwdenkgo	- start application at address 'addr'
4459c609719bSwdenkrun	- run commands in an environment variable
4460c609719bSwdenkbootm	- boot application image from memory
4461c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
446244f074c7SMarek Vasutbootz   - boot zImage from memory
4463c609719bSwdenktftpboot- boot image via network using TFTP protocol
4464c609719bSwdenk	       and env variables "ipaddr" and "serverip"
4465c609719bSwdenk	       (and eventually "gatewayip")
44661fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
4467c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
4468c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
4469c609719bSwdenkloads	- load S-Record file over serial line
4470c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
4471c609719bSwdenkmd	- memory display
4472c609719bSwdenkmm	- memory modify (auto-incrementing)
4473c609719bSwdenknm	- memory modify (constant address)
4474c609719bSwdenkmw	- memory write (fill)
4475c609719bSwdenkcp	- memory copy
4476c609719bSwdenkcmp	- memory compare
4477c609719bSwdenkcrc32	- checksum calculation
44780f89c54bSPeter Tyseri2c	- I2C sub-system
4479c609719bSwdenksspi	- SPI utility commands
4480c609719bSwdenkbase	- print or set address offset
4481c609719bSwdenkprintenv- print environment variables
4482c609719bSwdenksetenv	- set environment variables
4483c609719bSwdenksaveenv - save environment variables to persistent storage
4484c609719bSwdenkprotect - enable or disable FLASH write protection
4485c609719bSwdenkerase	- erase FLASH memory
4486c609719bSwdenkflinfo	- print FLASH memory information
448710635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
4488c609719bSwdenkbdinfo	- print Board Info structure
4489c609719bSwdenkiminfo	- print header information for application image
4490c609719bSwdenkconinfo - print console devices and informations
4491c609719bSwdenkide	- IDE sub-system
4492c609719bSwdenkloop	- infinite loop on address range
449356523f12Swdenkloopw	- infinite write loop on address range
4494c609719bSwdenkmtest	- simple RAM test
4495c609719bSwdenkicache	- enable or disable instruction cache
4496c609719bSwdenkdcache	- enable or disable data cache
4497c609719bSwdenkreset	- Perform RESET of the CPU
4498c609719bSwdenkecho	- echo args to console
4499c609719bSwdenkversion - print monitor version
4500c609719bSwdenkhelp	- print online help
4501c609719bSwdenk?	- alias for 'help'
4502c609719bSwdenk
4503c609719bSwdenk
4504c609719bSwdenkMonitor Commands - Detailed Description:
4505c609719bSwdenk========================================
4506c609719bSwdenk
4507c609719bSwdenkTODO.
4508c609719bSwdenk
4509c609719bSwdenkFor now: just type "help <command>".
4510c609719bSwdenk
4511c609719bSwdenk
4512c609719bSwdenkEnvironment Variables:
4513c609719bSwdenk======================
4514c609719bSwdenk
4515c609719bSwdenkU-Boot supports user configuration using Environment Variables which
4516c609719bSwdenkcan be made persistent by saving to Flash memory.
4517c609719bSwdenk
4518c609719bSwdenkEnvironment Variables are set using "setenv", printed using
4519c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
4520c609719bSwdenkwithout a value can be used to delete a variable from the
4521c609719bSwdenkenvironment. As long as you don't save the environment you are
4522c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
4523c609719bSwdenkenvironment is erased by accident, a default environment is provided.
4524c609719bSwdenk
4525c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
4526c96f86eeSWolfgang Denk
4527c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
4528c609719bSwdenk
4529c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
4530c609719bSwdenk
4531c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
4532c609719bSwdenk
4533c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
4534c609719bSwdenk
4535c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
4536c609719bSwdenk
4537c609719bSwdenk  bootfile	- Name of the image to load with TFTP
4538c609719bSwdenk
45397d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
45407d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
45417d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
45427d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
45437d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
45447d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
4545c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4546c3624e6eSGrant Likely		  bootm_mapsize.
4547c3624e6eSGrant Likely
4548c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
4549c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
4550c3624e6eSGrant Likely		  defines the size of the memory region starting at base
4551c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
4552c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
4553c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
4554c3624e6eSGrant Likely		  used otherwise.
45557d721e34SBartlomiej Sieka
45567d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
45577d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
45587d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
45597d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
45607d721e34SBartlomiej Sieka		  environment variable.
45617d721e34SBartlomiej Sieka
45624bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
45634bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
45644bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
45654bae9090SBartlomiej Sieka
4566c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
4567c609719bSwdenk		  "bootp" will just load perform a lookup of the
4568c609719bSwdenk		  configuration from the BOOTP server, but not try to
4569c609719bSwdenk		  load any image using TFTP
4570c609719bSwdenk
4571c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
4572c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
4573c609719bSwdenk		  be automatically started (by internally calling
4574c609719bSwdenk		  "bootm")
4575c609719bSwdenk
45764a6fd34bSwdenk		  If set to "no", a standalone image passed to the
45774a6fd34bSwdenk		  "bootm" command will be copied to the load address
45784a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
45794a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
45804a6fd34bSwdenk		  data.
45814a6fd34bSwdenk
4582a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
4583a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
4584fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
4585fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
4586fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
4587fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
4588fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
4589fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
4590fa34f6b2SShawn Guo		  access it during the boot procedure.
4591fa34f6b2SShawn Guo
4592a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
4593a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
4594a28afca5SDavid A. Long		  to work it must reside in writable memory, have
4595a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
4596a28afca5SDavid A. Long		  add the information it needs into it, and the memory
4597a28afca5SDavid A. Long		  must be accessible by the kernel.
4598a28afca5SDavid A. Long
4599eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
4600eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
4601eea63e05SSimon Glass		  defined.
4602eea63e05SSimon Glass
460317ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
460417ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
460517ea1177Swdenk		  mode (400kHZ). This environment variable is used in
460617ea1177Swdenk		  initialization code. So, for changes to be effective
460717ea1177Swdenk		  it must be saved and board must be reset.
460817ea1177Swdenk
4609c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
4610c609719bSwdenk		  If this variable is not set, initrd images will be
4611c609719bSwdenk		  copied to the highest possible address in RAM; this
4612c609719bSwdenk		  is usually what you want since it allows for
4613c609719bSwdenk		  maximum initrd size. If for some reason you want to
4614c609719bSwdenk		  make sure that the initrd image is loaded below the
46156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4616c609719bSwdenk		  variable to a value of "no" or "off" or "0".
4617c609719bSwdenk		  Alternatively, you can set it to a maximum upper
4618c609719bSwdenk		  address to use (U-Boot will still check that it
4619c609719bSwdenk		  does not overwrite the U-Boot stack and data).
4620c609719bSwdenk
4621c609719bSwdenk		  For instance, when you have a system with 16 MB
46227152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
4623c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
4624c609719bSwdenk		  the "bootargs" variable. However, now you must make
46257152b1d0Swdenk		  sure that the initrd image is placed in the first
4626c609719bSwdenk		  12 MB as well - this can be done with
4627c609719bSwdenk
4628c609719bSwdenk		  setenv initrd_high 00c00000
4629c609719bSwdenk
463038b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
463138b99261Swdenk		  indication to U-Boot that all addresses are legal
463238b99261Swdenk		  for the Linux kernel, including addresses in flash
463338b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
463438b99261Swdenk		  ramdisk at all. This may be useful to reduce the
463538b99261Swdenk		  boot time on your system, but requires that this
463638b99261Swdenk		  feature is supported by your Linux kernel.
463738b99261Swdenk
4638c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
4639c609719bSwdenk
4640c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
4641dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
4642c609719bSwdenk
4643c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
4644c609719bSwdenk
4645c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
4646c609719bSwdenk
4647c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
4648c609719bSwdenk
4649c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
4650c609719bSwdenk
4651c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
4652c609719bSwdenk
4653e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
4654a3d991bdSwdenk
4655e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
4656e2a53458SMike Frysinger		  For example you can do the following
4657a3d991bdSwdenk
465848690d80SHeiko Schocher		  => setenv ethact FEC
465948690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
466048690d80SHeiko Schocher		  => setenv ethact SCC
466148690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
4662a3d991bdSwdenk
4663e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
4664e1692577SMatthias Fuchs		  available network interfaces.
4665e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
4666e1692577SMatthias Fuchs
4667a3d991bdSwdenk  netretry	- When set to "no" each network operation will
4668a3d991bdSwdenk		  either succeed or fail without retrying.
46696e592385Swdenk		  When set to "once" the network operation will
46706e592385Swdenk		  fail when all the available network interfaces
46716e592385Swdenk		  are tried once without success.
4672a3d991bdSwdenk		  Useful on scripts which control the retry operation
4673a3d991bdSwdenk		  themselves.
4674a3d991bdSwdenk
4675b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
4676a1cf027aSJean-Christophe PLAGNIOL-VILLARD
46778d51aacdSSimon Glass  silent_linux  - If set then linux will be told to boot silently, by
46788d51aacdSSimon Glass		  changing the console to be empty. If "yes" it will be
46798d51aacdSSimon Glass		  made silent. If "no" it will not be made silent. If
46808d51aacdSSimon Glass		  unset, then it will be made silent if the U-Boot console
46818d51aacdSSimon Glass		  is silent.
46828d51aacdSSimon Glass
468328cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
4684ecb0ccd9SWolfgang Denk		  UDP source port.
4685ecb0ccd9SWolfgang Denk
468628cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
468728cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
468828cb9375SWolfgang Denk
4689c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
4690c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
4691c96f86eeSWolfgang Denk
4692c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
4693c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
4694c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
4695c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
4696c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
4697c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
4698c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
4699c96f86eeSWolfgang Denk
4700a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
470111ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
4702a3d991bdSwdenk		  VLAN tagged frames.
4703c609719bSwdenk
4704dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4705dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4706dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4707dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4708dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4709dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4710dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4711dc0b7b0eSJason Hobbs
4712dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4713dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4714dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4715dc0b7b0eSJason Hobbs
4716dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4717dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4718dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4719dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4720dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4721dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4722dc0b7b0eSJason Hobbs
4723c609719bSwdenkThe following environment variables may be used and automatically
4724c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4725c609719bSwdenkdepending the information provided by your boot server:
4726c609719bSwdenk
4727c609719bSwdenk  bootfile	- see above
4728c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4729fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4730c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4731c609719bSwdenk  hostname	- Target hostname
4732c609719bSwdenk  ipaddr	- see above
4733c609719bSwdenk  netmask	- Subnet Mask
4734c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4735c609719bSwdenk  serverip	- see above
4736c609719bSwdenk
4737c609719bSwdenk
4738c609719bSwdenkThere are two special Environment Variables:
4739c609719bSwdenk
4740c609719bSwdenk  serial#	- contains hardware identification information such
4741c609719bSwdenk		  as type string and/or serial number
4742c609719bSwdenk  ethaddr	- Ethernet address
4743c609719bSwdenk
4744c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4745c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4746c609719bSwdenkonce they have been set once.
4747c609719bSwdenk
4748c609719bSwdenk
4749c1551ea8SstroeseFurther special Environment Variables:
4750c1551ea8Sstroese
4751c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4752c1551ea8Sstroese		  with the "version" command. This variable is
4753c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4754c1551ea8Sstroese
4755c1551ea8Sstroese
4756c609719bSwdenkPlease note that changes to some configuration parameters may take
4757c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4758c609719bSwdenk
4759c609719bSwdenk
4760170ab110SJoe HershbergerCallback functions for environment variables:
4761170ab110SJoe Hershberger---------------------------------------------
4762170ab110SJoe Hershberger
4763170ab110SJoe HershbergerFor some environment variables, the behavior of u-boot needs to change
4764170ab110SJoe Hershbergerwhen their values are changed.  This functionailty allows functions to
4765170ab110SJoe Hershbergerbe associated with arbitrary variables.  On creation, overwrite, or
4766170ab110SJoe Hershbergerdeletion, the callback will provide the opportunity for some side
4767170ab110SJoe Hershbergereffect to happen or for the change to be rejected.
4768170ab110SJoe Hershberger
4769170ab110SJoe HershbergerThe callbacks are named and associated with a function using the
4770170ab110SJoe HershbergerU_BOOT_ENV_CALLBACK macro in your board or driver code.
4771170ab110SJoe Hershberger
4772170ab110SJoe HershbergerThese callbacks are associated with variables in one of two ways.  The
4773170ab110SJoe Hershbergerstatic list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4774170ab110SJoe Hershbergerin the board configuration to a string that defines a list of
4775170ab110SJoe Hershbergerassociations.  The list must be in the following format:
4776170ab110SJoe Hershberger
4777170ab110SJoe Hershberger	entry = variable_name[:callback_name]
4778170ab110SJoe Hershberger	list = entry[,list]
4779170ab110SJoe Hershberger
4780170ab110SJoe HershbergerIf the callback name is not specified, then the callback is deleted.
4781170ab110SJoe HershbergerSpaces are also allowed anywhere in the list.
4782170ab110SJoe Hershberger
4783170ab110SJoe HershbergerCallbacks can also be associated by defining the ".callbacks" variable
4784170ab110SJoe Hershbergerwith the same list format above.  Any association in ".callbacks" will
4785170ab110SJoe Hershbergeroverride any association in the static list. You can define
4786170ab110SJoe HershbergerCONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4787170ab110SJoe Hershberger".callbacks" envirnoment variable in the default or embedded environment.
4788170ab110SJoe Hershberger
4789170ab110SJoe Hershberger
4790f07771ccSwdenkCommand Line Parsing:
4791f07771ccSwdenk=====================
4792f07771ccSwdenk
4793f07771ccSwdenkThere are two different command line parsers available with U-Boot:
47947152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
4795f07771ccSwdenk
4796f07771ccSwdenkOld, simple command line parser:
4797f07771ccSwdenk--------------------------------
4798f07771ccSwdenk
4799f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4800f07771ccSwdenk- several commands on one line, separated by ';'
4801fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4802f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4803f07771ccSwdenk  for example:
4804fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4805f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4806f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4807f07771ccSwdenk
4808f07771ccSwdenkHush shell:
4809f07771ccSwdenk-----------
4810f07771ccSwdenk
4811f07771ccSwdenk- similar to Bourne shell, with control structures like
4812f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4813f07771ccSwdenk  until...do...done, ...
4814f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4815f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4816f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4817f07771ccSwdenk  command
4818f07771ccSwdenk
4819f07771ccSwdenkGeneral rules:
4820f07771ccSwdenk--------------
4821f07771ccSwdenk
4822f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4823f07771ccSwdenk    command) contains several commands separated by semicolon, and
4824f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4825f07771ccSwdenk    executed anyway.
4826f07771ccSwdenk
4827f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
482811ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4829f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4830f07771ccSwdenk    variables are not executed.
4831f07771ccSwdenk
4832c609719bSwdenkNote for Redundant Ethernet Interfaces:
4833c609719bSwdenk=======================================
4834c609719bSwdenk
483511ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4836c609719bSwdenksuch configurations and is capable of automatic selection of a
48377152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4838c609719bSwdenk
4839c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4840c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4841c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4842c609719bSwdenk
4843c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4844c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4845c609719bSwdenkding setting in the environment; if the corresponding environment
4846c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4847c609719bSwdenk
4848c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4849c609719bSwdenk  environment, the SROM's address is used.
4850c609719bSwdenk
4851c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4852c609719bSwdenk  environment exists, then the value from the environment variable is
4853c609719bSwdenk  used.
4854c609719bSwdenk
4855c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4856c609719bSwdenk  both addresses are the same, this MAC address is used.
4857c609719bSwdenk
4858c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4859c609719bSwdenk  addresses differ, the value from the environment is used and a
4860c609719bSwdenk  warning is printed.
4861c609719bSwdenk
4862c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4863c609719bSwdenk  is raised.
4864c609719bSwdenk
4865ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4866ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4867ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4868ecee9324SBen WarrenThe naming convention is as follows:
4869ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4870c609719bSwdenk
4871c609719bSwdenkImage Formats:
4872c609719bSwdenk==============
4873c609719bSwdenk
48743310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
48753310c549SMarian Balakowiczimages in two formats:
48763310c549SMarian Balakowicz
48773310c549SMarian BalakowiczNew uImage format (FIT)
48783310c549SMarian Balakowicz-----------------------
48793310c549SMarian Balakowicz
48803310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
48813310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
48823310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
48833310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
48843310c549SMarian Balakowicz
48853310c549SMarian Balakowicz
48863310c549SMarian BalakowiczOld uImage format
48873310c549SMarian Balakowicz-----------------
48883310c549SMarian Balakowicz
48893310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
48903310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
48913310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4892c609719bSwdenk
4893c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4894c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4895f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4896f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4897f5ed9e39SPeter Tyser  INTEGRITY).
48987b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4899afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4900afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4901c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4902c609719bSwdenk* Load Address
4903c609719bSwdenk* Entry Point
4904c609719bSwdenk* Image Name
4905c609719bSwdenk* Image Timestamp
4906c609719bSwdenk
4907c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4908c609719bSwdenkand the data portions of the image are secured against corruption by
4909c609719bSwdenkCRC32 checksums.
4910c609719bSwdenk
4911c609719bSwdenk
4912c609719bSwdenkLinux Support:
4913c609719bSwdenk==============
4914c609719bSwdenk
4915c609719bSwdenkAlthough U-Boot should support any OS or standalone application
49167152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4917c609719bSwdenkU-Boot.
4918c609719bSwdenk
4919c609719bSwdenkU-Boot includes many features that so far have been part of some
4920c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4921c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4922c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
49237152b1d0Swdenkserves several purposes:
4924c609719bSwdenk
4925c609719bSwdenk- the same features can be used for other OS or standalone
4926c609719bSwdenk  applications (for instance: using compressed images to reduce the
4927c609719bSwdenk  Flash memory footprint)
4928c609719bSwdenk
4929c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
49307152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4931c609719bSwdenk
4932c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4933c609719bSwdenk  images; of course this also means that different kernel images can
4934c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4935c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4936c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4937c609719bSwdenk  software is easier now.
4938c609719bSwdenk
4939c609719bSwdenk
4940c609719bSwdenkLinux HOWTO:
4941c609719bSwdenk============
4942c609719bSwdenk
4943c609719bSwdenkPorting Linux to U-Boot based systems:
4944c609719bSwdenk---------------------------------------
4945c609719bSwdenk
4946c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4947c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4948c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4949c609719bSwdenkLinux :-).
4950c609719bSwdenk
4951a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4952c609719bSwdenk
4953c609719bSwdenkJust make sure your machine specific header file (for instance
4954c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
49551dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
49561dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
49576d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4958c609719bSwdenk
4959c609719bSwdenk
4960c609719bSwdenkConfiguring the Linux kernel:
4961c609719bSwdenk-----------------------------
4962c609719bSwdenk
4963c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4964c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4965c609719bSwdenk
4966c609719bSwdenk
4967c609719bSwdenkBuilding a Linux Image:
4968c609719bSwdenk-----------------------
4969c609719bSwdenk
497024ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
497124ee89b9Swdenknot used. If you use recent kernel source, a new build target
497224ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
497324ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
497424ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
497524ee89b9Swdenk100% compatible format.
4976c609719bSwdenk
4977c609719bSwdenkExample:
4978c609719bSwdenk
4979c609719bSwdenk	make TQM850L_config
4980c609719bSwdenk	make oldconfig
4981c609719bSwdenk	make dep
498224ee89b9Swdenk	make uImage
4983c609719bSwdenk
498424ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
498524ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
498624ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
4987c609719bSwdenk
498824ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
498924ee89b9Swdenk
499024ee89b9Swdenk* convert the kernel into a raw binary image:
499124ee89b9Swdenk
499224ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
499324ee89b9Swdenk				 -R .note -R .comment \
499424ee89b9Swdenk				 -S vmlinux linux.bin
499524ee89b9Swdenk
499624ee89b9Swdenk* compress the binary image:
499724ee89b9Swdenk
499824ee89b9Swdenk	gzip -9 linux.bin
499924ee89b9Swdenk
500024ee89b9Swdenk* package compressed binary image for U-Boot:
500124ee89b9Swdenk
500224ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
500324ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
500424ee89b9Swdenk		-d linux.bin.gz uImage
500524ee89b9Swdenk
500624ee89b9Swdenk
500724ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
500824ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
500924ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
501024ee89b9Swdenkbyte header containing information about target architecture,
501124ee89b9Swdenkoperating system, image type, compression method, entry points, time
501224ee89b9Swdenkstamp, CRC32 checksums, etc.
501324ee89b9Swdenk
501424ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
501524ee89b9Swdenkprint the header information, or to build new images.
5016c609719bSwdenk
5017c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
5018c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
5019c609719bSwdenkchecksum verification:
5020c609719bSwdenk
5021c609719bSwdenk	tools/mkimage -l image
5022c609719bSwdenk	  -l ==> list image header information
5023c609719bSwdenk
5024c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
5025c609719bSwdenkfrom a "data file" which is used as image payload:
5026c609719bSwdenk
5027c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
5028c609719bSwdenk		      -n name -d data_file image
5029c609719bSwdenk	  -A ==> set architecture to 'arch'
5030c609719bSwdenk	  -O ==> set operating system to 'os'
5031c609719bSwdenk	  -T ==> set image type to 'type'
5032c609719bSwdenk	  -C ==> set compression type 'comp'
5033c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
5034c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
5035c609719bSwdenk	  -n ==> set image name to 'name'
5036c609719bSwdenk	  -d ==> use image data from 'datafile'
5037c609719bSwdenk
503869459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
503969459791Swdenkaddress (0x00000000), but the entry point address depends on the
504069459791Swdenkkernel version:
5041c609719bSwdenk
5042c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
504324ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
5044c609719bSwdenk
5045c609719bSwdenkSo a typical call to build a U-Boot image would read:
5046c609719bSwdenk
504724ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
504824ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
5049a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
505024ee89b9Swdenk	> examples/uImage.TQM850L
505124ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5052c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5053c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5054c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5055c609719bSwdenk	Load Address: 0x00000000
505624ee89b9Swdenk	Entry Point:  0x00000000
5057c609719bSwdenk
5058c609719bSwdenkTo verify the contents of the image (or check for corruption):
5059c609719bSwdenk
506024ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
506124ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5062c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5063c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
5064c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
5065c609719bSwdenk	Load Address: 0x00000000
506624ee89b9Swdenk	Entry Point:  0x00000000
5067c609719bSwdenk
5068c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
5069c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
5070c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
5071c609719bSwdenkneed to be uncompressed:
5072c609719bSwdenk
5073a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
507424ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
507524ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
5076a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
507724ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
507824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
5079c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
5080c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
5081c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
5082c609719bSwdenk	Load Address: 0x00000000
508324ee89b9Swdenk	Entry Point:  0x00000000
5084c609719bSwdenk
5085c609719bSwdenk
5086c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
5087c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
5088c609719bSwdenk
5089c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
5090c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
5091c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
5092c609719bSwdenk	Image Name:   Simple Ramdisk Image
5093c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
5094c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
5095c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
5096c609719bSwdenk	Load Address: 0x00000000
5097c609719bSwdenk	Entry Point:  0x00000000
5098c609719bSwdenk
5099c609719bSwdenk
5100c609719bSwdenkInstalling a Linux Image:
5101c609719bSwdenk-------------------------
5102c609719bSwdenk
5103c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
5104c609719bSwdenkyou must convert the image to S-Record format:
5105c609719bSwdenk
5106c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
5107c609719bSwdenk
5108c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
5109c609719bSwdenkimage header, so the resulting S-Record file will be relative to
5110c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
5111c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
5112c609719bSwdenkcommand.
5113c609719bSwdenk
5114c609719bSwdenkExample: install the image to address 0x40100000 (which on the
5115c609719bSwdenkTQM8xxL is in the first Flash bank):
5116c609719bSwdenk
5117c609719bSwdenk	=> erase 40100000 401FFFFF
5118c609719bSwdenk
5119c609719bSwdenk	.......... done
5120c609719bSwdenk	Erased 8 sectors
5121c609719bSwdenk
5122c609719bSwdenk	=> loads 40100000
5123c609719bSwdenk	## Ready for S-Record download ...
5124c609719bSwdenk	~>examples/image.srec
5125c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5126c609719bSwdenk	...
5127c609719bSwdenk	15989 15990 15991 15992
5128c609719bSwdenk	[file transfer complete]
5129c609719bSwdenk	[connected]
5130c609719bSwdenk	## Start Addr = 0x00000000
5131c609719bSwdenk
5132c609719bSwdenk
5133c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
5134c609719bSwdenkthis includes a checksum verification so you can be sure no data
5135c609719bSwdenkcorruption happened:
5136c609719bSwdenk
5137c609719bSwdenk	=> imi 40100000
5138c609719bSwdenk
5139c609719bSwdenk	## Checking Image at 40100000 ...
5140c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5141c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5142c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5143c609719bSwdenk	   Load Address: 00000000
5144c609719bSwdenk	   Entry Point:	 0000000c
5145c609719bSwdenk	   Verifying Checksum ... OK
5146c609719bSwdenk
5147c609719bSwdenk
5148c609719bSwdenkBoot Linux:
5149c609719bSwdenk-----------
5150c609719bSwdenk
5151c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
5152c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
5153c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
5154c609719bSwdenkparameters. You can check and modify this variable using the
5155c609719bSwdenk"printenv" and "setenv" commands:
5156c609719bSwdenk
5157c609719bSwdenk
5158c609719bSwdenk	=> printenv bootargs
5159c609719bSwdenk	bootargs=root=/dev/ram
5160c609719bSwdenk
5161c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5162c609719bSwdenk
5163c609719bSwdenk	=> printenv bootargs
5164c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5165c609719bSwdenk
5166c609719bSwdenk	=> bootm 40020000
5167c609719bSwdenk	## Booting Linux kernel at 40020000 ...
5168c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
5169c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5170c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
5171c609719bSwdenk	   Load Address: 00000000
5172c609719bSwdenk	   Entry Point:	 0000000c
5173c609719bSwdenk	   Verifying Checksum ... OK
5174c609719bSwdenk	   Uncompressing Kernel Image ... OK
5175c609719bSwdenk	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
5176c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5177c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5178c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5179c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5180c609719bSwdenk	...
5181c609719bSwdenk
518211ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
51837152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
5184c609719bSwdenkformat!) to the "bootm" command:
5185c609719bSwdenk
5186c609719bSwdenk	=> imi 40100000 40200000
5187c609719bSwdenk
5188c609719bSwdenk	## Checking Image at 40100000 ...
5189c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5190c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5191c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5192c609719bSwdenk	   Load Address: 00000000
5193c609719bSwdenk	   Entry Point:	 0000000c
5194c609719bSwdenk	   Verifying Checksum ... OK
5195c609719bSwdenk
5196c609719bSwdenk	## Checking Image at 40200000 ...
5197c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5198c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5199c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5200c609719bSwdenk	   Load Address: 00000000
5201c609719bSwdenk	   Entry Point:	 00000000
5202c609719bSwdenk	   Verifying Checksum ... OK
5203c609719bSwdenk
5204c609719bSwdenk	=> bootm 40100000 40200000
5205c609719bSwdenk	## Booting Linux kernel at 40100000 ...
5206c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5207c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5208c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5209c609719bSwdenk	   Load Address: 00000000
5210c609719bSwdenk	   Entry Point:	 0000000c
5211c609719bSwdenk	   Verifying Checksum ... OK
5212c609719bSwdenk	   Uncompressing Kernel Image ... OK
5213c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
5214c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5215c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5216c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5217c609719bSwdenk	   Load Address: 00000000
5218c609719bSwdenk	   Entry Point:	 00000000
5219c609719bSwdenk	   Verifying Checksum ... OK
5220c609719bSwdenk	   Loading Ramdisk ... OK
5221c609719bSwdenk	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
5222c609719bSwdenk	Boot arguments: root=/dev/ram
5223c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5224c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5225c609719bSwdenk	...
5226c609719bSwdenk	RAMDISK: Compressed image found at block 0
5227c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
5228c609719bSwdenk
5229c609719bSwdenk	bash#
5230c609719bSwdenk
52310267768eSMatthew McClintockBoot Linux and pass a flat device tree:
52320267768eSMatthew McClintock-----------
52330267768eSMatthew McClintock
52340267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
52350267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
52360267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
52370267768eSMatthew McClintockflat device tree:
52380267768eSMatthew McClintock
52390267768eSMatthew McClintock=> print oftaddr
52400267768eSMatthew McClintockoftaddr=0x300000
52410267768eSMatthew McClintock=> print oft
52420267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
52430267768eSMatthew McClintock=> tftp $oftaddr $oft
52440267768eSMatthew McClintockSpeed: 1000, full duplex
52450267768eSMatthew McClintockUsing TSEC0 device
52460267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
52470267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
52480267768eSMatthew McClintockLoad address: 0x300000
52490267768eSMatthew McClintockLoading: #
52500267768eSMatthew McClintockdone
52510267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
52520267768eSMatthew McClintock=> tftp $loadaddr $bootfile
52530267768eSMatthew McClintockSpeed: 1000, full duplex
52540267768eSMatthew McClintockUsing TSEC0 device
52550267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
52560267768eSMatthew McClintockFilename 'uImage'.
52570267768eSMatthew McClintockLoad address: 0x200000
52580267768eSMatthew McClintockLoading:############
52590267768eSMatthew McClintockdone
52600267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
52610267768eSMatthew McClintock=> print loadaddr
52620267768eSMatthew McClintockloadaddr=200000
52630267768eSMatthew McClintock=> print oftaddr
52640267768eSMatthew McClintockoftaddr=0x300000
52650267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
52660267768eSMatthew McClintock## Booting image at 00200000 ...
52670267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
52680267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
52690267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
52700267768eSMatthew McClintock   Load Address: 00000000
52710267768eSMatthew McClintock   Entry Point:	 00000000
52720267768eSMatthew McClintock   Verifying Checksum ... OK
52730267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
52740267768eSMatthew McClintockBooting using flat device tree at 0x300000
52750267768eSMatthew McClintockUsing MPC85xx ADS machine description
52760267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
52770267768eSMatthew McClintock[snip]
52780267768eSMatthew McClintock
52790267768eSMatthew McClintock
52806069ff26SwdenkMore About U-Boot Image Types:
52816069ff26Swdenk------------------------------
52826069ff26Swdenk
52836069ff26SwdenkU-Boot supports the following image types:
52846069ff26Swdenk
52856069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
52866069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
52876069ff26Swdenk	well) you can continue to work in U-Boot after return from
52886069ff26Swdenk	the Standalone Program.
52896069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
52906069ff26Swdenk	will take over control completely. Usually these programs
52916069ff26Swdenk	will install their own set of exception handlers, device
52926069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
52936069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
52946069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
52956069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
52966069ff26Swdenk	being started.
52976069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
52986069ff26Swdenk	(Linux) kernel image and one or more data images like
52996069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
53006069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
53016069ff26Swdenk	server provides just a single image file, but you want to get
53026069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
53036069ff26Swdenk
53046069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
53056069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
53066069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
53076069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
53086069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
53096069ff26Swdenk	a multiple of 4 bytes).
53106069ff26Swdenk
53116069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
53126069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
53136069ff26Swdenk	flash memory.
53146069ff26Swdenk
53156069ff26Swdenk   "Script files" are command sequences that will be executed by
53166069ff26Swdenk	U-Boot's command interpreter; this feature is especially
53176069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
53186069ff26Swdenk	as command interpreter.
53196069ff26Swdenk
532044f074c7SMarek VasutBooting the Linux zImage:
532144f074c7SMarek Vasut-------------------------
532244f074c7SMarek Vasut
532344f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
532444f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
532544f074c7SMarek Vasutas the syntax of "bootm" command.
532644f074c7SMarek Vasut
53278ac28563STom RiniNote, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
5328017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
5329017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
5330017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
5331017e1f3fSMarek Vasut
5332c609719bSwdenk
5333c609719bSwdenkStandalone HOWTO:
5334c609719bSwdenk=================
5335c609719bSwdenk
5336c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
5337c609719bSwdenkrun "standalone" applications, which can use some resources of
5338c609719bSwdenkU-Boot like console I/O functions or interrupt services.
5339c609719bSwdenk
5340c609719bSwdenkTwo simple examples are included with the sources:
5341c609719bSwdenk
5342c609719bSwdenk"Hello World" Demo:
5343c609719bSwdenk-------------------
5344c609719bSwdenk
5345c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
5346c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
5347c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
5348c609719bSwdenklike that:
5349c609719bSwdenk
5350c609719bSwdenk	=> loads
5351c609719bSwdenk	## Ready for S-Record download ...
5352c609719bSwdenk	~>examples/hello_world.srec
5353c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5354c609719bSwdenk	[file transfer complete]
5355c609719bSwdenk	[connected]
5356c609719bSwdenk	## Start Addr = 0x00040004
5357c609719bSwdenk
5358c609719bSwdenk	=> go 40004 Hello World! This is a test.
5359c609719bSwdenk	## Starting application at 0x00040004 ...
5360c609719bSwdenk	Hello World
5361c609719bSwdenk	argc = 7
5362c609719bSwdenk	argv[0] = "40004"
5363c609719bSwdenk	argv[1] = "Hello"
5364c609719bSwdenk	argv[2] = "World!"
5365c609719bSwdenk	argv[3] = "This"
5366c609719bSwdenk	argv[4] = "is"
5367c609719bSwdenk	argv[5] = "a"
5368c609719bSwdenk	argv[6] = "test."
5369c609719bSwdenk	argv[7] = "<NULL>"
5370c609719bSwdenk	Hit any key to exit ...
5371c609719bSwdenk
5372c609719bSwdenk	## Application terminated, rc = 0x0
5373c609719bSwdenk
5374c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
5375c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
5376c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
5377c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
5378c609719bSwdenkcharacter, but this is just a demo program. The application can be
5379c609719bSwdenkcontrolled by the following keys:
5380c609719bSwdenk
5381c609719bSwdenk	? - print current values og the CPM Timer registers
5382c609719bSwdenk	b - enable interrupts and start timer
5383c609719bSwdenk	e - stop timer and disable interrupts
5384c609719bSwdenk	q - quit application
5385c609719bSwdenk
5386c609719bSwdenk	=> loads
5387c609719bSwdenk	## Ready for S-Record download ...
5388c609719bSwdenk	~>examples/timer.srec
5389c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5390c609719bSwdenk	[file transfer complete]
5391c609719bSwdenk	[connected]
5392c609719bSwdenk	## Start Addr = 0x00040004
5393c609719bSwdenk
5394c609719bSwdenk	=> go 40004
5395c609719bSwdenk	## Starting application at 0x00040004 ...
5396c609719bSwdenk	TIMERS=0xfff00980
5397c609719bSwdenk	Using timer 1
5398c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5399c609719bSwdenk
5400c609719bSwdenkHit 'b':
5401c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
5402c609719bSwdenk	Enabling timer
5403c609719bSwdenkHit '?':
5404c609719bSwdenk	[q, b, e, ?] ........
5405c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5406c609719bSwdenkHit '?':
5407c609719bSwdenk	[q, b, e, ?] .
5408c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5409c609719bSwdenkHit '?':
5410c609719bSwdenk	[q, b, e, ?] .
5411c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5412c609719bSwdenkHit '?':
5413c609719bSwdenk	[q, b, e, ?] .
5414c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5415c609719bSwdenkHit 'e':
5416c609719bSwdenk	[q, b, e, ?] ...Stopping timer
5417c609719bSwdenkHit 'q':
5418c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
5419c609719bSwdenk
5420c609719bSwdenk
542185ec0bccSwdenkMinicom warning:
542285ec0bccSwdenk================
542385ec0bccSwdenk
54247152b1d0SwdenkOver time, many people have reported problems when trying to use the
542585ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
542685ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
5427f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
542885ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
5429e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
5430e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5431e53515a2SKarl O. Pincfor help with kermit.
5432e53515a2SKarl O. Pinc
543385ec0bccSwdenk
543452f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
543552f52c14Swdenkconfiguration to your "File transfer protocols" section:
543652f52c14Swdenk
543752f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
543852f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
543952f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
544052f52c14Swdenk
544152f52c14Swdenk
5442c609719bSwdenkNetBSD Notes:
5443c609719bSwdenk=============
5444c609719bSwdenk
5445c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
5446c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
5447c609719bSwdenk
5448c609719bSwdenkBuilding requires a cross environment; it is known to work on
5449c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5450c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
5451c609719bSwdenkNote that the cross-powerpc package does not install include files;
5452c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
5453c609719bSwdenkmissing.  This file has to be installed and patched manually:
5454c609719bSwdenk
5455c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
5456c609719bSwdenk	# mkdir powerpc
5457c609719bSwdenk	# ln -s powerpc machine
5458c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5459c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
5460c609719bSwdenk
5461c609719bSwdenkNative builds *don't* work due to incompatibilities between native
5462c609719bSwdenkand U-Boot include files.
5463c609719bSwdenk
5464c609719bSwdenkBooting assumes that (the first part of) the image booted is a
5465c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
5466c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
5467c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
54682a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5469c609719bSwdenk
5470c609719bSwdenk
5471c609719bSwdenkImplementation Internals:
5472c609719bSwdenk=========================
5473c609719bSwdenk
5474c609719bSwdenkThe following is not intended to be a complete description of every
5475c609719bSwdenkimplementation detail. However, it should help to understand the
5476c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
5477c609719bSwdenkhardware.
5478c609719bSwdenk
5479c609719bSwdenk
5480c609719bSwdenkInitial Stack, Global Data:
5481c609719bSwdenk---------------------------
5482c609719bSwdenk
5483c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
5484c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
5485c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
5486c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
5487c609719bSwdenkis not initialized as zero. To be able to get a C environment working
5488c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
5489c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
5490c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
5491c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
5492c609719bSwdenklocked as (mis-) used as memory, etc.
5493c609719bSwdenk
54947152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
54950668236bSWolfgang Denk	U-Boot mailing list:
549643d9616cSwdenk
549743d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
549843d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
549943d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
550043d9616cSwdenk	...
550143d9616cSwdenk
550243d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
550343d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
550443d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
550543d9616cSwdenk	is that the cache is being used as a temporary supply of
550643d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
550711ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
550843d9616cSwdenk	can see how this works by studying the cache architecture and
550943d9616cSwdenk	operation in the architecture and processor-specific manuals.
551043d9616cSwdenk
551143d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
551243d9616cSwdenk	is another option for the system designer to use as an
551311ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
551443d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
551543d9616cSwdenk	board designers haven't used it for something that would
551643d9616cSwdenk	cause you grief during the initial boot! It is frequently not
551743d9616cSwdenk	used.
551843d9616cSwdenk
55196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
552043d9616cSwdenk	with your processor/board/system design. The default value
552143d9616cSwdenk	you will find in any recent u-boot distribution in
55228a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
552343d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
552443d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
552543d9616cSwdenk	that are supposed to respond to that address! That code in
552643d9616cSwdenk	start.S has been around a while and should work as is when
552743d9616cSwdenk	you get the config right.
552843d9616cSwdenk
552943d9616cSwdenk	-Chris Hallinan
553043d9616cSwdenk	DS4.COM, Inc.
553143d9616cSwdenk
5532c609719bSwdenkIt is essential to remember this, since it has some impact on the C
5533c609719bSwdenkcode for the initialization procedures:
5534c609719bSwdenk
5535c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
5536c609719bSwdenk  to write it.
5537c609719bSwdenk
553811ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
5539c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
55407152b1d0Swdenk  zation is performed later (when relocating to RAM).
5541c609719bSwdenk
5542c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
5543c609719bSwdenk  that.
5544c609719bSwdenk
5545c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
5546c609719bSwdenknormal global data to share information beween the code. But it
5547c609719bSwdenkturned out that the implementation of U-Boot can be greatly
5548c609719bSwdenksimplified by making a global data structure (gd_t) available to all
5549c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
5550c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
5551c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
5552c609719bSwdenkplace a pointer (gd) to the global data into a register which we
5553c609719bSwdenkreserve for this purpose.
5554c609719bSwdenk
55557152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
5556c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
5557c609719bSwdenkGCC's implementation.
5558c609719bSwdenk
5559c609719bSwdenkFor PowerPC, the following registers have specific use:
5560c609719bSwdenk	R1:	stack pointer
5561e7670f6cSWolfgang Denk	R2:	reserved for system use
5562c609719bSwdenk	R3-R4:	parameter passing and return values
5563c609719bSwdenk	R5-R10: parameter passing
5564c609719bSwdenk	R13:	small data area pointer
5565c609719bSwdenk	R30:	GOT pointer
5566c609719bSwdenk	R31:	frame pointer
5567c609719bSwdenk
5568e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
5569e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
5570e6bee808SJoakim Tjernlund	going back and forth between asm and C)
5571c609719bSwdenk
5572e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
5573c609719bSwdenk
5574c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
5575c609719bSwdenk    address of the global data structure is known at compile time),
5576c609719bSwdenk    but it turned out that reserving a register results in somewhat
5577c609719bSwdenk    smaller code - although the code savings are not that big (on
5578c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
5579c609719bSwdenk    624 text + 127 data).
5580c609719bSwdenk
5581c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
55824c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
55834c58eb55SMike Frysinger
5584c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
55854c58eb55SMike Frysinger
5586c609719bSwdenkOn ARM, the following registers are used:
5587c609719bSwdenk
5588c609719bSwdenk	R0:	function argument word/integer result
5589c609719bSwdenk	R1-R3:	function argument word
5590*12eba1b4SJeroen Hofstee	R9:	platform specific
5591*12eba1b4SJeroen Hofstee	R10:	stack limit (used only if stack checking is enabled)
5592c609719bSwdenk	R11:	argument (frame) pointer
5593c609719bSwdenk	R12:	temporary workspace
5594c609719bSwdenk	R13:	stack pointer
5595c609719bSwdenk	R14:	link register
5596c609719bSwdenk	R15:	program counter
5597c609719bSwdenk
5598*12eba1b4SJeroen Hofstee    ==> U-Boot will use R9 to hold a pointer to the global data
5599*12eba1b4SJeroen Hofstee
5600*12eba1b4SJeroen Hofstee    Note: on ARM, only R_ARM_RELATIVE relocations are supported.
5601c609719bSwdenk
56020df01fd3SThomas ChouOn Nios II, the ABI is documented here:
56030df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
56040df01fd3SThomas Chou
56050df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
56060df01fd3SThomas Chou
56070df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
56080df01fd3SThomas Chou    to access small data sections, so gp is free.
56090df01fd3SThomas Chou
5610afc1ce82SMacpaul LinOn NDS32, the following registers are used:
5611afc1ce82SMacpaul Lin
5612afc1ce82SMacpaul Lin	R0-R1:	argument/return
5613afc1ce82SMacpaul Lin	R2-R5:	argument
5614afc1ce82SMacpaul Lin	R15:	temporary register for assembler
5615afc1ce82SMacpaul Lin	R16:	trampoline register
5616afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
5617afc1ce82SMacpaul Lin	R29:	global pointer (GP)
5618afc1ce82SMacpaul Lin	R30:	link register (LP)
5619afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
5620afc1ce82SMacpaul Lin	PC:	program counter (PC)
5621afc1ce82SMacpaul Lin
5622afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
5623afc1ce82SMacpaul Lin
5624d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5625d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
5626c609719bSwdenk
5627c609719bSwdenkMemory Management:
5628c609719bSwdenk------------------
5629c609719bSwdenk
5630c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
5631c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
5632c609719bSwdenk
5633c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
5634c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
5635c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
5636c609719bSwdenkphysical memory banks.
5637c609719bSwdenk
5638c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
5639c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5640c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
5641c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
56426d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5643c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
5644c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
5645c609719bSwdenk
5646c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
5647c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
5648c609719bSwdenk
5649c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
5650c609719bSwdenkthis:
5651c609719bSwdenk
5652c609719bSwdenk	0x0000 0000	Exception Vector code
5653c609719bSwdenk	      :
5654c609719bSwdenk	0x0000 1FFF
5655c609719bSwdenk	0x0000 2000	Free for Application Use
5656c609719bSwdenk	      :
5657c609719bSwdenk	      :
5658c609719bSwdenk
5659c609719bSwdenk	      :
5660c609719bSwdenk	      :
5661c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
5662c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
5663c609719bSwdenk	0x00FC 0000	Malloc Arena
5664c609719bSwdenk	      :
5665c609719bSwdenk	0x00FD FFFF
5666c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
5667c609719bSwdenk	...		eventually: LCD or video framebuffer
5668c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
5669c609719bSwdenk	0x00FF FFFF	[End of RAM]
5670c609719bSwdenk
5671c609719bSwdenk
5672c609719bSwdenkSystem Initialization:
5673c609719bSwdenk----------------------
5674c609719bSwdenk
5675c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
567611ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
5677c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
56787152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
5679c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
5680c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
5681c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
5682c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
5683c609719bSwdenkthe caches and the SIU.
5684c609719bSwdenk
5685c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
5686c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
5687c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5688c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5689c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
5690c609719bSwdenksimple memory test is run that determines the size of the SDRAM
5691c609719bSwdenkbanks.
5692c609719bSwdenk
5693c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
56947152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
5695c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
5696c609719bSwdenk0x00000000, with any additional banks following immediately to create
5697c609719bSwdenkcontiguous memory starting from 0.
5698c609719bSwdenk
5699c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
5700c609719bSwdenkand allocates memory for use by malloc() and for the global Board
5701c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
5702c609719bSwdenkpages, and the final stack is set up.
5703c609719bSwdenk
5704c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
5705c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
5706c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
5707c609719bSwdenknew address in RAM.
5708c609719bSwdenk
5709c609719bSwdenk
5710c609719bSwdenkU-Boot Porting Guide:
5711c609719bSwdenk----------------------
5712c609719bSwdenk
5713c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
57146aff3115Swdenklist, October 2002]
5715c609719bSwdenk
5716c609719bSwdenk
5717c609719bSwdenkint main(int argc, char *argv[])
5718c609719bSwdenk{
5719c609719bSwdenk	sighandler_t no_more_time;
5720c609719bSwdenk
5721c609719bSwdenk	signal(SIGALRM, no_more_time);
5722c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5723c609719bSwdenk
5724c609719bSwdenk	if (available_money > available_manpower) {
57256c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
5726c609719bSwdenk		return 0;
5727c609719bSwdenk	}
5728c609719bSwdenk
5729c609719bSwdenk	Download latest U-Boot source;
5730c609719bSwdenk
57310668236bSWolfgang Denk	Subscribe to u-boot mailing list;
57326aff3115Swdenk
57336c3fef28SJerry Van Baren	if (clueless)
5734c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
5735c609719bSwdenk
5736c609719bSwdenk	while (learning) {
5737c609719bSwdenk		Read the README file in the top level directory;
57387cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
57396c3fef28SJerry Van Baren		Read applicable doc/*.README;
5740c609719bSwdenk		Read the source, Luke;
57416c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5742c609719bSwdenk	}
5743c609719bSwdenk
57446c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
57456c3fef28SJerry Van Baren		Buy a BDI3000;
57466c3fef28SJerry Van Baren	else
5747c609719bSwdenk		Add a lot of aggravation and time;
5748c609719bSwdenk
57496c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
57506c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
57516c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
57526c3fef28SJerry Van Baren	} else {
5753c609719bSwdenk		Create your own board support subdirectory;
57546c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
57556c3fef28SJerry Van Baren	}
57566c3fef28SJerry Van Baren	Edit new board/<myboard> files
57576c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5758c609719bSwdenk
57596c3fef28SJerry Van Baren	while (!accepted) {
5760c609719bSwdenk		while (!running) {
5761c609719bSwdenk			do {
5762c609719bSwdenk				Add / modify source code;
5763c609719bSwdenk			} until (compiles);
5764c609719bSwdenk			Debug;
5765c609719bSwdenk			if (clueless)
5766c609719bSwdenk				email("Hi, I am having problems...");
5767c609719bSwdenk		}
57686c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
57696c3fef28SJerry Van Baren		if (reasonable critiques)
57706c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
57716c3fef28SJerry Van Baren		else
57726c3fef28SJerry Van Baren			Defend code as written;
57736c3fef28SJerry Van Baren	}
5774c609719bSwdenk
5775c609719bSwdenk	return 0;
5776c609719bSwdenk}
5777c609719bSwdenk
5778c609719bSwdenkvoid no_more_time (int sig)
5779c609719bSwdenk{
5780c609719bSwdenk      hire_a_guru();
5781c609719bSwdenk}
5782c609719bSwdenk
5783c609719bSwdenk
5784c609719bSwdenkCoding Standards:
5785c609719bSwdenk-----------------
5786c609719bSwdenk
5787c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
57882c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
57897ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
5790c609719bSwdenk
57912c051651SDetlev ZundelSource files originating from a different project (for example the
57922c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
57932c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
57942c051651SDetlev Zundelsources.
57952c051651SDetlev Zundel
57962c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
57972c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
57982c051651SDetlev Zundelin your code.
5799c609719bSwdenk
5800c178d3daSwdenkPlease also stick to the following formatting rules:
5801180d3f74Swdenk- remove any trailing white space
58027ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5803180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
58047ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5805180d3f74Swdenk- do not add trailing empty lines to source files
5806180d3f74Swdenk
5807c609719bSwdenkSubmissions which do not conform to the standards may be returned
5808c609719bSwdenkwith a request to reformat the changes.
5809c609719bSwdenk
5810c609719bSwdenk
5811c609719bSwdenkSubmitting Patches:
5812c609719bSwdenk-------------------
5813c609719bSwdenk
5814c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5815c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5816c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5817c609719bSwdenk
58180d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5819218ca724SWolfgang Denk
58200668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
58210668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
58220668236bSWolfgang Denk
5823c609719bSwdenkWhen you send a patch, please include the following information with
5824c609719bSwdenkit:
5825c609719bSwdenk
5826c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5827c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5828c609719bSwdenk  patch actually fixes something.
5829c609719bSwdenk
5830c609719bSwdenk* For new features: a description of the feature and your
5831c609719bSwdenk  implementation.
5832c609719bSwdenk
5833c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5834c609719bSwdenk
5835c609719bSwdenk* For major contributions, your entry to the CREDITS file
5836c609719bSwdenk
583727af930eSAlbert ARIBAUD* When you add support for a new board, don't forget to add a
583827af930eSAlbert ARIBAUD  maintainer e-mail address to the boards.cfg file, too.
5839c609719bSwdenk
5840c609719bSwdenk* If your patch adds new configuration options, don't forget to
5841c609719bSwdenk  document these in the README file.
5842c609719bSwdenk
5843218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5844218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
58457ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5846218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5847218ca724SWolfgang Denk  with some other mail clients.
5848c609719bSwdenk
5849218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5850218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5851218ca724SWolfgang Denk  GNU diff.
58526dff5529Swdenk
5853218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5854218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5855218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5856218ca724SWolfgang Denk  affected files).
5857218ca724SWolfgang Denk
5858218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5859218ca724SWolfgang Denk  and compressed attachments must not be used.
5860c609719bSwdenk
586152f52c14Swdenk* If one logical set of modifications affects or creates several
586252f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
586352f52c14Swdenk
586452f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
586552f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
586652f52c14Swdenk
586752f52c14Swdenk
5868c609719bSwdenkNotes:
5869c609719bSwdenk
5870c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5871c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5872c609719bSwdenk  for any of the boards.
5873c609719bSwdenk
5874c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5875c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5876c609719bSwdenk  returned with a request to re-formatting / split it.
5877c609719bSwdenk
5878c609719bSwdenk* If you modify existing code, make sure that your new code does not
5879c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5880c609719bSwdenk  When adding new features, these should compile conditionally only
5881c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5882c609719bSwdenk  disabled must not need more memory than the old code without your
5883c609719bSwdenk  modification.
588490dc6704Swdenk
58850668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
58860668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
58870668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
58880668236bSWolfgang Denk  bigger than the size limit should be avoided.
5889