xref: /openbmc/u-boot/README (revision 67b23a322848d828a5e45c0567b72762bfde7abf)
1c609719bSwdenk#
2218ca724SWolfgang Denk# (C) Copyright 2000 - 2008
3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4c609719bSwdenk#
5c609719bSwdenk# See file CREDITS for list of people who contributed to this
6c609719bSwdenk# project.
7c609719bSwdenk#
8c609719bSwdenk# This program is free software; you can redistribute it and/or
9c609719bSwdenk# modify it under the terms of the GNU General Public License as
10c609719bSwdenk# published by the Free Software Foundation; either version 2 of
11c609719bSwdenk# the License, or (at your option) any later version.
12c609719bSwdenk#
13c609719bSwdenk# This program is distributed in the hope that it will be useful,
14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of
15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
16c609719bSwdenk# GNU General Public License for more details.
17c609719bSwdenk#
18c609719bSwdenk# You should have received a copy of the GNU General Public License
19c609719bSwdenk# along with this program; if not, write to the Free Software
20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21c609719bSwdenk# MA 02111-1307 USA
22c609719bSwdenk#
23c609719bSwdenk
24c609719bSwdenkSummary:
25c609719bSwdenk========
26c609719bSwdenk
2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for
28e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other
29e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to
30e86e5a07Swdenkinitialize and test the hardware or to download and run application
31e86e5a07Swdenkcode.
32c609719bSwdenk
33c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of
3424ee89b9Swdenkthe source code originate in the Linux source tree, we have some
3524ee89b9Swdenkheader files in common, and special provision has been made to
36c609719bSwdenksupport booting of Linux images.
37c609719bSwdenk
38c609719bSwdenkSome attention has been paid to make this software easily
39c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are
40c609719bSwdenkimplemented with the same call interface, so that it's very easy to
41c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used
42c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can
43c609719bSwdenkload and run it dynamically.
44c609719bSwdenk
45c609719bSwdenk
46c609719bSwdenkStatus:
47c609719bSwdenk=======
48c609719bSwdenk
49c609719bSwdenkIn general, all boards for which a configuration option exists in the
50c609719bSwdenkMakefile have been tested to some extent and can be considered
51c609719bSwdenk"working". In fact, many of them are used in production systems.
52c609719bSwdenk
53c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out
54218ca724SWolfgang Denkwho contributed the specific port. The MAINTAINERS file lists board
55218ca724SWolfgang Denkmaintainers.
56c609719bSwdenk
57c609719bSwdenk
58c609719bSwdenkWhere to get help:
59c609719bSwdenk==================
60c609719bSwdenk
61c609719bSwdenkIn case you have questions about, problems with or contributions for
62c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
630c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
640c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
650c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
660c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
67c609719bSwdenk
68c609719bSwdenk
69218ca724SWolfgang DenkWhere to get source code:
70218ca724SWolfgang Denk=========================
71218ca724SWolfgang Denk
72218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
73218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
74218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
75218ca724SWolfgang Denk
76218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
7711ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
78218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
79218ca724SWolfgang Denkdirectory.
80218ca724SWolfgang Denk
81d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
82218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
83218ca724SWolfgang Denk
84218ca724SWolfgang Denk
85c609719bSwdenkWhere we come from:
86c609719bSwdenk===================
87c609719bSwdenk
88c609719bSwdenk- start from 8xxrom sources
8924ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
90c609719bSwdenk- clean up code
91c609719bSwdenk- make it easier to add custom boards
92c609719bSwdenk- make it possible to add other [PowerPC] CPUs
93c609719bSwdenk- extend functions, especially:
94c609719bSwdenk  * Provide extended interface to Linux boot loader
95c609719bSwdenk  * S-Record download
96c609719bSwdenk  * network boot
9711ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
9824ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
99c609719bSwdenk- add other CPU families (starting with ARM)
10024ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
1010d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
10224ee89b9Swdenk
10324ee89b9Swdenk
10424ee89b9SwdenkNames and Spelling:
10524ee89b9Swdenk===================
10624ee89b9Swdenk
10724ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
10824ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
10924ee89b9Swdenkin source files etc.). Example:
11024ee89b9Swdenk
11124ee89b9Swdenk	This is the README file for the U-Boot project.
11224ee89b9Swdenk
11324ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
11424ee89b9Swdenk
11524ee89b9Swdenk	include/asm-ppc/u-boot.h
11624ee89b9Swdenk
11724ee89b9Swdenk	#include <asm/u-boot.h>
11824ee89b9Swdenk
11924ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
12024ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
12124ee89b9Swdenk
12224ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
12324ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
124c609719bSwdenk
125c609719bSwdenk
12693f19cc0SwdenkVersioning:
12793f19cc0Swdenk===========
12893f19cc0Swdenk
12993f19cc0SwdenkU-Boot uses a 3 level version number containing a version, a
13093f19cc0Swdenksub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
13193f19cc0Swdenksub-version "34", and patchlevel "4".
13293f19cc0Swdenk
13393f19cc0SwdenkThe patchlevel is used to indicate certain stages of development
13493f19cc0Swdenkbetween released versions, i. e. officially released versions of
13593f19cc0SwdenkU-Boot will always have a patchlevel of "0".
13693f19cc0Swdenk
13793f19cc0Swdenk
138c609719bSwdenkDirectory Hierarchy:
139c609719bSwdenk====================
140c609719bSwdenk
1417152b1d0Swdenk- board		Board dependent files
1427152b1d0Swdenk- common	Misc architecture independent functions
143c609719bSwdenk- cpu		CPU specific files
144983fda83Swdenk  - 74xx_7xx	Files specific to Freescale MPC74xx and 7xx CPUs
14511dadd54Swdenk  - arm720t	Files specific to ARM 720 CPUs
14611dadd54Swdenk  - arm920t	Files specific to ARM 920 CPUs
147a85f9f21Swdenk    - at91rm9200 Files specific to Atmel AT91RM9200 CPU
148983fda83Swdenk    - imx	Files specific to Freescale MC9328 i.MX CPUs
1491d9f4105Swdenk    - s3c24x0	Files specific to Samsung S3C24X0 CPUs
15011dadd54Swdenk  - arm925t	Files specific to ARM 925 CPUs
15111dadd54Swdenk  - arm926ejs	Files specific to ARM 926 CPUs
1528ed96046Swdenk  - arm1136	Files specific to ARM 1136 CPUs
15372a087e0SWolfgang Denk  - at32ap	Files specific to Atmel AVR32 AP CPUs
15411dadd54Swdenk  - i386	Files specific to i386 CPUs
15511dadd54Swdenk  - ixp		Files specific to Intel XScale IXP CPUs
156b330990cSDaniel Hellstrom  - leon2	Files specific to Gaisler LEON2 SPARC CPU
1571e9a164eSDaniel Hellstrom  - leon3	Files specific to Gaisler LEON3 SPARC CPU
158983fda83Swdenk  - mcf52x2	Files specific to Freescale ColdFire MCF52x2 CPUs
1591552af70STsiChungLiew  - mcf5227x	Files specific to Freescale ColdFire MCF5227x CPUs
1608e585f02STsiChung Liew  - mcf532x	Files specific to Freescale ColdFire MCF5329 CPUs
1618ae158cdSTsiChungLiew  - mcf5445x	Files specific to Freescale ColdFire MCF5445x CPUs
16257a12720STsiChungLiew  - mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
16311dadd54Swdenk  - mips	Files specific to MIPS CPUs
164983fda83Swdenk  - mpc5xx	Files specific to Freescale MPC5xx  CPUs
165983fda83Swdenk  - mpc5xxx	Files specific to Freescale MPC5xxx CPUs
166983fda83Swdenk  - mpc8xx	Files specific to Freescale MPC8xx  CPUs
167983fda83Swdenk  - mpc8220	Files specific to Freescale MPC8220 CPUs
168983fda83Swdenk  - mpc824x	Files specific to Freescale MPC824x CPUs
169983fda83Swdenk  - mpc8260	Files specific to Freescale MPC8260 CPUs
170983fda83Swdenk  - mpc85xx	Files specific to Freescale MPC85xx CPUs
17111dadd54Swdenk  - nios	Files specific to Altera NIOS CPUs
1725c952cf0Swdenk  - nios2	Files specific to Altera Nios-II CPUs
1730c8721a4SWolfgang Denk  - ppc4xx	Files specific to AMCC PowerPC 4xx CPUs
17411dadd54Swdenk  - pxa		Files specific to Intel XScale PXA CPUs
17511dadd54Swdenk  - s3c44b0	Files specific to Samsung S3C44B0 CPUs
17611dadd54Swdenk  - sa1100	Files specific to Intel StrongARM SA1100 CPUs
177c609719bSwdenk- disk		Code for disk drive partition handling
178c609719bSwdenk- doc		Documentation (don't expect too much)
1797152b1d0Swdenk- drivers	Commonly used device drivers
180c609719bSwdenk- dtt		Digital Thermometer and Thermostat drivers
181c609719bSwdenk- examples	Example code for standalone applications, etc.
182c609719bSwdenk- include	Header Files
18311dadd54Swdenk- lib_arm	Files generic to ARM	 architecture
1847b64fef3SWolfgang Denk- lib_avr32	Files generic to AVR32	 architecture
18511dadd54Swdenk- lib_generic	Files generic to all	 architectures
18611dadd54Swdenk- lib_i386	Files generic to i386	 architecture
18711dadd54Swdenk- lib_m68k	Files generic to m68k	 architecture
18811dadd54Swdenk- lib_mips	Files generic to MIPS	 architecture
18911dadd54Swdenk- lib_nios	Files generic to NIOS	 architecture
19011dadd54Swdenk- lib_ppc	Files generic to PowerPC architecture
191c2f02da2SDaniel Hellstrom- lib_sparc	Files generic to SPARC	 architecture
192213bf8c8SGerald Van Baren- libfdt	Library files to support flattened device trees
193c609719bSwdenk- net		Networking code
194c609719bSwdenk- post		Power On Self Test
195c609719bSwdenk- rtc		Real Time Clock drivers
196c609719bSwdenk- tools		Tools to build S-Record or U-Boot images, etc.
197c609719bSwdenk
198c609719bSwdenkSoftware Configuration:
199c609719bSwdenk=======================
200c609719bSwdenk
201c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
202c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
203c609719bSwdenk
204c609719bSwdenkThere are two classes of configuration variables:
205c609719bSwdenk
206c609719bSwdenk* Configuration _OPTIONS_:
207c609719bSwdenk  These are selectable by the user and have names beginning with
208c609719bSwdenk  "CONFIG_".
209c609719bSwdenk
210c609719bSwdenk* Configuration _SETTINGS_:
211c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
212c609719bSwdenk  you don't know what you're doing; they have names beginning with
213c609719bSwdenk  "CFG_".
214c609719bSwdenk
215c609719bSwdenkLater we will add a configuration tool - probably similar to or even
216c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
217c609719bSwdenkdo the configuration by hand, which means creating some symbolic
218c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
219c609719bSwdenkas an example here.
220c609719bSwdenk
221c609719bSwdenk
222c609719bSwdenkSelection of Processor Architecture and Board Type:
223c609719bSwdenk---------------------------------------------------
224c609719bSwdenk
225c609719bSwdenkFor all supported boards there are ready-to-use default
226c609719bSwdenkconfigurations available; just type "make <board_name>_config".
227c609719bSwdenk
228c609719bSwdenkExample: For a TQM823L module type:
229c609719bSwdenk
230c609719bSwdenk	cd u-boot
231c609719bSwdenk	make TQM823L_config
232c609719bSwdenk
23311ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
234c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
235c609719bSwdenkdirectory according to the instructions in cogent/README.
236c609719bSwdenk
237c609719bSwdenk
238c609719bSwdenkConfiguration Options:
239c609719bSwdenk----------------------
240c609719bSwdenk
241c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
242c609719bSwdenksuch information is kept in a configuration file
243c609719bSwdenk"include/configs/<board_name>.h".
244c609719bSwdenk
245c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
246c609719bSwdenk"include/configs/TQM823L.h".
247c609719bSwdenk
248c609719bSwdenk
2497f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2507f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2517f6c2cbcSwdenkbuild a config tool - later.
2527f6c2cbcSwdenk
2537f6c2cbcSwdenk
254c609719bSwdenkThe following options need to be configured:
255c609719bSwdenk
2562628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
257c609719bSwdenk
2582628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2596ccec449SWolfgang Denk
2606ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
26109ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
262c609719bSwdenk
263c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
264c609719bSwdenk		Define exactly one of
265c609719bSwdenk		CONFIG_CMA286_60_OLD
266c609719bSwdenk--- FIXME --- not tested yet:
267c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
268c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
269c609719bSwdenk
270c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
271c609719bSwdenk		Define exactly one of
272c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
273c609719bSwdenk
274c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
275c609719bSwdenk		Define one or more of
276c609719bSwdenk		CONFIG_CMA302
277c609719bSwdenk
278c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
279c609719bSwdenk		Define one or more of
280c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
28111ccc33fSMarcel Ziswiler					  the LCD display every second with
282c609719bSwdenk					  a "rotator" |\-/|\-/
283c609719bSwdenk
2842535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
2852535d602Swdenk		CONFIG_ADSTYPE
2862535d602Swdenk		Possible values are:
2872535d602Swdenk			CFG_8260ADS	- original MPC8260ADS
288180d3f74Swdenk			CFG_8266ADS	- MPC8266ADS
28954387ac9Swdenk			CFG_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
29004a85b3bSwdenk			CFG_8272ADS	- MPC8272ADS
2912535d602Swdenk
292c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
293c609719bSwdenk		Define exactly one of
294c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
295c609719bSwdenk
29611ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
29766ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
29866ca92a5Swdenk					  get_gclk_freq() cannot work
2995da627a4Swdenk					  e.g. if there is no 32KHz
3005da627a4Swdenk					  reference PIT/RTC clock
30166ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
30266ca92a5Swdenk					  or XTAL/EXTAL)
303c609719bSwdenk
30466ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
30566ca92a5Swdenk		CFG_8xx_CPUCLK_MIN
30666ca92a5Swdenk		CFG_8xx_CPUCLK_MAX
30766ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
30875d1ea7fSwdenk			See doc/README.MPC866
30975d1ea7fSwdenk
31075d1ea7fSwdenk		CFG_MEASURE_CPUCLK
31175d1ea7fSwdenk
31275d1ea7fSwdenk		Define this to measure the actual CPU clock instead
31375d1ea7fSwdenk		of relying on the correctness of the configured
31475d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
31575d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
31675d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
31766ca92a5Swdenk		RTC clock or CFG_8XX_XIN)
31875d1ea7fSwdenk
3190b953ffcSMarkus Klotzbuecher- Intel Monahans options:
3200b953ffcSMarkus Klotzbuecher		CFG_MONAHANS_RUN_MODE_OSC_RATIO
3210b953ffcSMarkus Klotzbuecher
3220b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
3230b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
3240b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
3250b953ffcSMarkus Klotzbuecher
3260b953ffcSMarkus Klotzbuecher		CFG_MONAHANS_TURBO_RUN_MODE_RATIO
3270b953ffcSMarkus Klotzbuecher
3280b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
3290b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
3300b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
3310b953ffcSMarkus Klotzbuecher		by this value.
3320b953ffcSMarkus Klotzbuecher
3335da627a4Swdenk- Linux Kernel Interface:
334c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
335c609719bSwdenk
336c609719bSwdenk		U-Boot stores all clock information in Hz
337c609719bSwdenk		internally. For binary compatibility with older Linux
338c609719bSwdenk		kernels (which expect the clocks passed in the
339c609719bSwdenk		bd_info data to be in MHz) the environment variable
340c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
341c609719bSwdenk		converts clock data to MHZ before passing it to the
342c609719bSwdenk		Linux kernel.
343c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
344c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
345c609719bSwdenk		default environment.
346c609719bSwdenk
3475da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
3485da627a4Swdenk
34911ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
3505da627a4Swdenk		expect it to be in bytes, others in MB.
3515da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
3525da627a4Swdenk
353fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
354f57f70aaSWolfgang Denk
355f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
356213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
357213bf8c8SGerald Van Baren		concepts).
358213bf8c8SGerald Van Baren
359213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
360213bf8c8SGerald Van Baren		 * New libfdt-based support
361213bf8c8SGerald Van Baren		 * Adds the "fdt" command
3623bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
363213bf8c8SGerald Van Baren
364f57f70aaSWolfgang Denk		OF_CPU - The proper name of the cpus node.
365c2871f03SKumar Gala		OF_SOC - The proper name of the soc node.
366f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
367c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
368f57f70aaSWolfgang Denk
36911ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
37011ccc33fSMarcel Ziswiler		addresses
3713bb342fcSKim Phillips
3724e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
3734e253137SKumar Gala
3744e253137SKumar Gala		Board code has addition modification that it wants to make
3754e253137SKumar Gala		to the flat device tree before handing it off to the kernel
3766705d81eSwdenk
3770267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
3780267768eSMatthew McClintock
37911ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
3800267768eSMatthew McClintock		param header, the default value is zero if undefined.
3810267768eSMatthew McClintock
3826705d81eSwdenk- Serial Ports:
38348d0192fSAndreas Engel		CONFIG_PL010_SERIAL
3846705d81eSwdenk
3856705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
3866705d81eSwdenk
38748d0192fSAndreas Engel		CONFIG_PL011_SERIAL
3886705d81eSwdenk
3896705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
3906705d81eSwdenk
3916705d81eSwdenk		CONFIG_PL011_CLOCK
3926705d81eSwdenk
3936705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
3946705d81eSwdenk		the clock speed of the UARTs.
3956705d81eSwdenk
3966705d81eSwdenk		CONFIG_PL01x_PORTS
3976705d81eSwdenk
3986705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
3996705d81eSwdenk		define this to a list of base addresses for each (supported)
4006705d81eSwdenk		port. See e.g. include/configs/versatile.h
4016705d81eSwdenk
4026705d81eSwdenk
403c609719bSwdenk- Console Interface:
404c609719bSwdenk		Depending on board, define exactly one serial port
405c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
406c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
407c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
408c609719bSwdenk
409c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
410c609719bSwdenk		port routines must be defined elsewhere
411c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
412c609719bSwdenk
413c609719bSwdenk		CONFIG_CFB_CONSOLE
414c609719bSwdenk		Enables console device for a color framebuffer. Needs following
415c609719bSwdenk		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
416c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
417c609719bSwdenk						(default big endian)
418c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
419c609719bSwdenk						rectangle fill
420c609719bSwdenk						(cf. smiLynxEM)
421c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
422c609719bSwdenk						bit-blit (cf. smiLynxEM)
423c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
424c609719bSwdenk						(cols=pitch)
425c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
426c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
427c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
428c609719bSwdenk						(0-5, cf. cfb_console.c)
429c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
430c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
431c609719bSwdenk						(i.e. i8042_kbd_init())
432c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
433c609719bSwdenk						(i.e. i8042_tstc)
434c609719bSwdenk			VIDEO_GETC_FCT		get char fct
435c609719bSwdenk						(i.e. i8042_getc)
436c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
437c609719bSwdenk						(requires blink timer
438c609719bSwdenk						cf. i8042.c)
439c609719bSwdenk			CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
440c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
441c609719bSwdenk						upper right corner
442602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
443c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
444c609719bSwdenk						upper left corner
445a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
446a6c7ad2fSwdenk						linux_logo.h for logo.
447a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
448c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
44911ccc33fSMarcel Ziswiler						additional board info beside
450c609719bSwdenk						the logo
451c609719bSwdenk
452c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
453c609719bSwdenk		default i/o. Serial console can be forced with
454c609719bSwdenk		environment 'console=serial'.
455c609719bSwdenk
456a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
457a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
458a3ad8e26Swdenk		the "silent" environment variable. See
459a3ad8e26Swdenk		doc/README.silent for more information.
460a3ad8e26Swdenk
461c609719bSwdenk- Console Baudrate:
462c609719bSwdenk		CONFIG_BAUDRATE - in bps
463c609719bSwdenk		Select one of the baudrates listed in
464c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
4653bbc899fSwdenk		CFG_BRGCLK_PRESCALE, baudrate prescale
466c609719bSwdenk
467c609719bSwdenk- Interrupt driven serial port input:
468c609719bSwdenk		CONFIG_SERIAL_SOFTWARE_FIFO
469c609719bSwdenk
470c609719bSwdenk		PPC405GP only.
471c609719bSwdenk		Use an interrupt handler for receiving data on the
472c609719bSwdenk		serial port. It also enables using hardware handshake
473c609719bSwdenk		(RTS/CTS) and UART's built-in FIFO. Set the number of
474c609719bSwdenk		bytes the interrupt driven input buffer should have.
475c609719bSwdenk
476109c0e3aSwdenk		Leave undefined to disable this feature, including
477109c0e3aSwdenk		disable the buffer and hardware handshake.
478c609719bSwdenk
4791d49b1f3Sstroese- Console UART Number:
4801d49b1f3Sstroese		CONFIG_UART1_CONSOLE
4811d49b1f3Sstroese
4820c8721a4SWolfgang Denk		AMCC PPC4xx only.
4831d49b1f3Sstroese		If defined internal UART1 (and not UART0) is used
4841d49b1f3Sstroese		as default U-Boot console.
4851d49b1f3Sstroese
486c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
487c609719bSwdenk		Delay before automatically booting the default image;
488c609719bSwdenk		set to -1 to disable autoboot.
489c609719bSwdenk
490c609719bSwdenk		See doc/README.autoboot for these options that
491c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
492c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
493c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
494c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
495c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
496c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
497c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
498c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
499c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
500c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
501c609719bSwdenk		CONFIG_RESET_TO_RETRY
502c609719bSwdenk
503c609719bSwdenk- Autoboot Command:
504c609719bSwdenk		CONFIG_BOOTCOMMAND
505c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
506c609719bSwdenk		define a command string that is automatically executed
507c609719bSwdenk		when no character is read on the console interface
508c609719bSwdenk		within "Boot Delay" after reset.
509c609719bSwdenk
510c609719bSwdenk		CONFIG_BOOTARGS
511c609719bSwdenk		This can be used to pass arguments to the bootm
512c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
513c609719bSwdenk		environment value "bootargs".
514c609719bSwdenk
515c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
516c609719bSwdenk		The value of these goes into the environment as
517c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
518c609719bSwdenk		as a convenience, when switching between booting from
51911ccc33fSMarcel Ziswiler		RAM and NFS.
520c609719bSwdenk
521c609719bSwdenk- Pre-Boot Commands:
522c609719bSwdenk		CONFIG_PREBOOT
523c609719bSwdenk
524c609719bSwdenk		When this option is #defined, the existence of the
525c609719bSwdenk		environment variable "preboot" will be checked
526c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
527c609719bSwdenk		countdown and/or running the auto-boot command resp.
528c609719bSwdenk		entering interactive mode.
529c609719bSwdenk
530c609719bSwdenk		This feature is especially useful when "preboot" is
531c609719bSwdenk		automatically generated or modified. For an example
532c609719bSwdenk		see the LWMON board specific code: here "preboot" is
533c609719bSwdenk		modified when the user holds down a certain
534c609719bSwdenk		combination of keys on the (special) keyboard when
535c609719bSwdenk		booting the systems
536c609719bSwdenk
537c609719bSwdenk- Serial Download Echo Mode:
538c609719bSwdenk		CONFIG_LOADS_ECHO
539c609719bSwdenk		If defined to 1, all characters received during a
540c609719bSwdenk		serial download (using the "loads" command) are
541c609719bSwdenk		echoed back. This might be needed by some terminal
542c609719bSwdenk		emulations (like "cu"), but may as well just take
543c609719bSwdenk		time on others. This setting #define's the initial
544c609719bSwdenk		value of the "loads_echo" environment variable.
545c609719bSwdenk
546602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
547c609719bSwdenk		CONFIG_KGDB_BAUDRATE
548c609719bSwdenk		Select one of the baudrates listed in
549c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
550c609719bSwdenk
551c609719bSwdenk- Monitor Functions:
552602ad3b3SJon Loeliger		Monitor commands can be included or excluded
553602ad3b3SJon Loeliger		from the build by using the #include files
554602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
555602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
556602ad3b3SJon Loeliger		and augmenting with additional #define's
557602ad3b3SJon Loeliger		for wanted commands.
558c609719bSwdenk
559602ad3b3SJon Loeliger		The default command configuration includes all commands
560602ad3b3SJon Loeliger		except those marked below with a "*".
561602ad3b3SJon Loeliger
562602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
563602ad3b3SJon Loeliger		CONFIG_CMD_AUTOSCRIPT	  Autoscript Support
564602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
565602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
566602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
567602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
568602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
569602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
570602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
571602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
572602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
573602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
574602ad3b3SJon Loeliger		CONFIG_CMD_DOC		* Disk-On-Chip Support
575602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
576602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
577602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
578602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
579602ad3b3SJon Loeliger		CONFIG_CMD_ENV		  saveenv
580602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
581602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
582602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
583602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
584602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
585602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
586602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
587602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
588602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
589602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
590602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
591602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
592602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
593602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
594602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
595602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
596602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
597602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
59856523f12Swdenk					  loop, loopw, mtest
599602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
600602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
601602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
602602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
603602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
604602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
605602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
606602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
607602ad3b3SJon Loeliger					  host
608602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
609602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
610602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
611602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
612602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
613602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
614602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
615602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
616602ad3b3SJon Loeliger					  (4xx only)
617602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
618602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
619602ad3b3SJon Loeliger		CONFIG_CMD_VFD		* VFD support (TRAB)
620602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
621602ad3b3SJon Loeliger		CONFIG_CMD_FSL		* Microblaze FSL support
622c609719bSwdenk
623c609719bSwdenk
624c609719bSwdenk		EXAMPLE: If you want all functions except of network
625c609719bSwdenk		support you can write:
626c609719bSwdenk
627602ad3b3SJon Loeliger		#include "config_cmd_all.h"
628602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
629c609719bSwdenk
630213bf8c8SGerald Van Baren	Other Commands:
631213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
632c609719bSwdenk
633c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
634602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
635c609719bSwdenk		what you (and your U-Boot users) are doing. Data
636c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
637c609719bSwdenk		8260 (where accesses to the IMMR region must be
638c609719bSwdenk		uncached), and it cannot be disabled on all other
639c609719bSwdenk		systems where we (mis-) use the data cache to hold an
640c609719bSwdenk		initial stack and some data.
641c609719bSwdenk
642c609719bSwdenk
643c609719bSwdenk		XXX - this list needs to get updated!
644c609719bSwdenk
645c609719bSwdenk- Watchdog:
646c609719bSwdenk		CONFIG_WATCHDOG
647c609719bSwdenk		If this variable is defined, it enables watchdog
6487152b1d0Swdenk		support. There must be support in the platform specific
649c609719bSwdenk		code for a watchdog. For the 8xx and 8260 CPUs, the
650c609719bSwdenk		SIU Watchdog feature is enabled in the SYPCR
651c609719bSwdenk		register.
652c609719bSwdenk
653c1551ea8Sstroese- U-Boot Version:
654c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
655c1551ea8Sstroese		If this variable is defined, an environment variable
656c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
657c1551ea8Sstroese		version as printed by the "version" command.
658c1551ea8Sstroese		This variable is readonly.
659c1551ea8Sstroese
660c609719bSwdenk- Real-Time Clock:
661c609719bSwdenk
662602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
663c609719bSwdenk		has to be selected, too. Define exactly one of the
664c609719bSwdenk		following options:
665c609719bSwdenk
666c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
667c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
6687ce63709SGuennadi Liakhovetski		CONFIG_RTC_MC13783	- use MC13783 RTC
669c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
6701cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
671c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
6727f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
6733bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
6749536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
6754c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
676da8808dfSJoakim Tjernlund		CFG_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
677c609719bSwdenk
678b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
679b37c7e5eSwdenk		must also be configured. See I2C Support, below.
680b37c7e5eSwdenk
681c609719bSwdenk- Timestamp Support:
682c609719bSwdenk
683c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
684c609719bSwdenk		(date and time) of an image is printed by image
685c609719bSwdenk		commands like bootm or iminfo. This option is
686602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
687c609719bSwdenk
688c609719bSwdenk- Partition Support:
689c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
69007f3d789Srichardretanubun		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
691c609719bSwdenk
692602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
693218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
694218ca724SWolfgang Denk		least one partition type as well.
695c609719bSwdenk
696c609719bSwdenk- IDE Reset method:
6974d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
6984d13cbadSwdenk		board configurations files but used nowhere!
699c609719bSwdenk
7004d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
7014d13cbadSwdenk		be performed by calling the function
7024d13cbadSwdenk			ide_set_reset(int reset)
7034d13cbadSwdenk		which has to be defined in a board specific file
704c609719bSwdenk
705c609719bSwdenk- ATAPI Support:
706c609719bSwdenk		CONFIG_ATAPI
707c609719bSwdenk
708c609719bSwdenk		Set this to enable ATAPI support.
709c609719bSwdenk
710c40b2956Swdenk- LBA48 Support
711c40b2956Swdenk		CONFIG_LBA48
712c40b2956Swdenk
713c40b2956Swdenk		Set this to enable support for disks larger than 137GB
714c40b2956Swdenk		Also look at CFG_64BIT_LBA ,CFG_64BIT_VSPRINTF and CFG_64BIT_STRTOUL
715c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
716c40b2956Swdenk		support disks up to 2.1TB.
717c40b2956Swdenk
718c40b2956Swdenk		CFG_64BIT_LBA:
719c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
720c40b2956Swdenk			Default is 32bit.
721c40b2956Swdenk
722c609719bSwdenk- SCSI Support:
723c609719bSwdenk		At the moment only there is only support for the
724c609719bSwdenk		SYM53C8XX SCSI controller; define
725c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
726c609719bSwdenk
727c609719bSwdenk		CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
728c609719bSwdenk		CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
729c609719bSwdenk		CFG_SCSI_MAX_LUN] can be adjusted to define the
730c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
731c609719bSwdenk		devices.
732c609719bSwdenk		CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
733c609719bSwdenk
734c609719bSwdenk- NETWORK Support (PCI):
735682011ffSwdenk		CONFIG_E1000
736682011ffSwdenk		Support for Intel 8254x gigabit chips.
737682011ffSwdenk
738ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
73911ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
740ac3315c2SAndre Schwarz
741c609719bSwdenk		CONFIG_EEPRO100
742c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
74311ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
744c609719bSwdenk		write routine for first time initialisation.
745c609719bSwdenk
746c609719bSwdenk		CONFIG_TULIP
747c609719bSwdenk		Support for Digital 2114x chips.
748c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
749c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
750c609719bSwdenk
751c609719bSwdenk		CONFIG_NATSEMI
752c609719bSwdenk		Support for National dp83815 chips.
753c609719bSwdenk
754c609719bSwdenk		CONFIG_NS8382X
755c609719bSwdenk		Support for National dp8382[01] gigabit chips.
756c609719bSwdenk
75745219c46Swdenk- NETWORK Support (other):
75845219c46Swdenk
75945219c46Swdenk		CONFIG_DRIVER_LAN91C96
76045219c46Swdenk		Support for SMSC's LAN91C96 chips.
76145219c46Swdenk
76245219c46Swdenk			CONFIG_LAN91C96_BASE
76345219c46Swdenk			Define this to hold the physical address
76445219c46Swdenk			of the LAN91C96's I/O space
76545219c46Swdenk
76645219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
76745219c46Swdenk			Define this to enable 32 bit addressing
76845219c46Swdenk
769f39748aeSwdenk		CONFIG_DRIVER_SMC91111
770f39748aeSwdenk		Support for SMSC's LAN91C111 chip
771f39748aeSwdenk
772f39748aeSwdenk			CONFIG_SMC91111_BASE
773f39748aeSwdenk			Define this to hold the physical address
774f39748aeSwdenk			of the device (I/O space)
775f39748aeSwdenk
776f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
777f39748aeSwdenk			Define this if data bus is 32 bits
778f39748aeSwdenk
779f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
780f39748aeSwdenk			Define this to use i/o functions instead of macros
781f39748aeSwdenk			(some hardware wont work with macros)
782f39748aeSwdenk
783557b377dSJens Gehrlein		CONFIG_DRIVER_SMC911X
784557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
785557b377dSJens Gehrlein
786557b377dSJens Gehrlein			CONFIG_DRIVER_SMC911X_BASE
787557b377dSJens Gehrlein			Define this to hold the physical address
788557b377dSJens Gehrlein			of the device (I/O space)
789557b377dSJens Gehrlein
790557b377dSJens Gehrlein			CONFIG_DRIVER_SMC911X_32_BIT
791557b377dSJens Gehrlein			Define this if data bus is 32 bits
792557b377dSJens Gehrlein
793557b377dSJens Gehrlein			CONFIG_DRIVER_SMC911X_16_BIT
794557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
795557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
796557b377dSJens Gehrlein			words you may also try CONFIG_DRIVER_SMC911X_32_BIT.
797557b377dSJens Gehrlein
798c609719bSwdenk- USB Support:
799c609719bSwdenk		At the moment only the UHCI host controller is
8004d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
801c609719bSwdenk		CONFIG_USB_UHCI to enable it.
802c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
80330d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
804c609719bSwdenk		storage devices.
805c609719bSwdenk		Note:
806c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
807c609719bSwdenk		(TEAC FD-05PUB).
8084d13cbadSwdenk		MPC5200 USB requires additional defines:
8094d13cbadSwdenk			CONFIG_USB_CLOCK
8104d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
8114d13cbadSwdenk			CONFIG_USB_CONFIG
8124d13cbadSwdenk				for differential drivers: 0x00001000
8134d13cbadSwdenk				for single ended drivers: 0x00005000
814fdcfaa1bSZhang Wei			CFG_USB_EVENT_POLL
815fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
816fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
8174d13cbadSwdenk
81816c8d5e7SWolfgang Denk- USB Device:
81916c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
82016c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
82116c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
82211ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
82316c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
82416c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
82516c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
82616c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
82716c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
82816c8d5e7SWolfgang Denk		a Linux host by
82916c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
83016c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
83116c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
83216c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
83316c8d5e7SWolfgang Denk
83416c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
83516c8d5e7SWolfgang Denk			Define this to build a UDC device
83616c8d5e7SWolfgang Denk
83716c8d5e7SWolfgang Denk			CONFIG_USB_TTY
83816c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
83916c8d5e7SWolfgang Denk			talk to the UDC device
84016c8d5e7SWolfgang Denk
84116c8d5e7SWolfgang Denk			CFG_CONSOLE_IS_IN_ENV
84216c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
84316c8d5e7SWolfgang Denk			be set to usbtty.
84416c8d5e7SWolfgang Denk
84516c8d5e7SWolfgang Denk			mpc8xx:
84616c8d5e7SWolfgang Denk				CFG_USB_EXTC_CLK 0xBLAH
84716c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
84816c8d5e7SWolfgang Denk				- CFG_USB_EXTC_CLK 0x02
84916c8d5e7SWolfgang Denk
85016c8d5e7SWolfgang Denk				CFG_USB_BRG_CLK 0xBLAH
85116c8d5e7SWolfgang Denk				Derive USB clock from brgclk
85216c8d5e7SWolfgang Denk				- CFG_USB_BRG_CLK 0x04
85316c8d5e7SWolfgang Denk
85416c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
85516c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
85616c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
85716c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
85816c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
85916c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
86016c8d5e7SWolfgang Denk
86116c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
86216c8d5e7SWolfgang Denk			Define this string as the name of your company for
86316c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
86416c8d5e7SWolfgang Denk
86516c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
86616c8d5e7SWolfgang Denk			Define this string as the name of your product
86716c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
86816c8d5e7SWolfgang Denk
86916c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
87016c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
87116c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
87216c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
87316c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
87416c8d5e7SWolfgang Denk
87516c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
87616c8d5e7SWolfgang Denk			Define this as the unique Product ID
87716c8d5e7SWolfgang Denk			for your device
87816c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
879c609719bSwdenk
880c609719bSwdenk
881c609719bSwdenk- MMC Support:
882c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
883c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
884c609719bSwdenk		accessed from the boot prompt by mapping the device
885c609719bSwdenk		to physical memory similar to flash. Command line is
886602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
887602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
888c609719bSwdenk
8896705d81eSwdenk- Journaling Flash filesystem support:
8906705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
8916705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
8926705d81eSwdenk		Define these for a default partition on a NAND device
8936705d81eSwdenk
8946705d81eSwdenk		CFG_JFFS2_FIRST_SECTOR,
8956705d81eSwdenk		CFG_JFFS2_FIRST_BANK, CFG_JFFS2_NUM_BANKS
8966705d81eSwdenk		Define these for a default partition on a NOR device
8976705d81eSwdenk
8986705d81eSwdenk		CFG_JFFS_CUSTOM_PART
8996705d81eSwdenk		Define this to create an own partition. You have to provide a
9006705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
9016705d81eSwdenk
9026705d81eSwdenk		If you define only one JFFS2 partition you may also want to
9036705d81eSwdenk		#define CFG_JFFS_SINGLE_PART	1
9046705d81eSwdenk		to disable the command chpart. This is the default when you
9056705d81eSwdenk		have not defined a custom partition
9066705d81eSwdenk
907c609719bSwdenk- Keyboard Support:
908c609719bSwdenk		CONFIG_ISA_KEYBOARD
909c609719bSwdenk
910c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
911c609719bSwdenk		support
912c609719bSwdenk
913c609719bSwdenk		CONFIG_I8042_KBD
914c609719bSwdenk		Standard PC keyboard driver with US (is default) and
915c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
916c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
917c609719bSwdenk		for cfb_console. Supports cursor blinking.
918c609719bSwdenk
919c609719bSwdenk- Video support:
920c609719bSwdenk		CONFIG_VIDEO
921c609719bSwdenk
922c609719bSwdenk		Define this to enable video support (for output to
923c609719bSwdenk		video).
924c609719bSwdenk
925c609719bSwdenk		CONFIG_VIDEO_CT69000
926c609719bSwdenk
927c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
928c609719bSwdenk
929c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
930eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
931eeb1b77bSwdenk		video output is selected via environment 'videoout'
932eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
933eeb1b77bSwdenk		assumed.
934c609719bSwdenk
935eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
93611ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
937eeb1b77bSwdenk		are possible:
938eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
939eeb1b77bSwdenk		Following standard modes are supported	(* is default):
940eeb1b77bSwdenk
941eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
942eeb1b77bSwdenk		-------------+---------------------------------------------
943eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
944eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
945eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
946eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
947eeb1b77bSwdenk		-------------+---------------------------------------------
948c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
949c609719bSwdenk
950eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
9517817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
952eeb1b77bSwdenk
953eeb1b77bSwdenk
954a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
955a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
956a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
957a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
958a6c7ad2fSwdenk
959682011ffSwdenk- Keyboard Support:
960682011ffSwdenk		CONFIG_KEYBOARD
961682011ffSwdenk
962682011ffSwdenk		Define this to enable a custom keyboard support.
963682011ffSwdenk		This simply calls drv_keyboard_init() which must be
964682011ffSwdenk		defined in your board-specific files.
965682011ffSwdenk		The only board using this so far is RBC823.
966a6c7ad2fSwdenk
967c609719bSwdenk- LCD Support:	CONFIG_LCD
968c609719bSwdenk
969c609719bSwdenk		Define this to enable LCD support (for output to LCD
970c609719bSwdenk		display); also select one of the supported displays
971c609719bSwdenk		by defining one of these:
972c609719bSwdenk
97339cf4804SStelian Pop		CONFIG_ATMEL_LCD:
97439cf4804SStelian Pop
97539cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
97639cf4804SStelian Pop
977fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
978c609719bSwdenk
979fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
980c609719bSwdenk
981fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
982c609719bSwdenk
983fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
984fd3103bbSwdenk			Active, color, single scan.
985fd3103bbSwdenk
986fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
987fd3103bbSwdenk
988fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
989c609719bSwdenk			Active, color, single scan.
990c609719bSwdenk
991c609719bSwdenk		CONFIG_SHARP_16x9
992c609719bSwdenk
993c609719bSwdenk			Sharp 320x240. Active, color, single scan.
994c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
995c609719bSwdenk
996c609719bSwdenk		CONFIG_SHARP_LQ64D341
997c609719bSwdenk
998c609719bSwdenk			Sharp LQ64D341 display, 640x480.
999c609719bSwdenk			Active, color, single scan.
1000c609719bSwdenk
1001c609719bSwdenk		CONFIG_HLD1045
1002c609719bSwdenk
1003c609719bSwdenk			HLD1045 display, 640x480.
1004c609719bSwdenk			Active, color, single scan.
1005c609719bSwdenk
1006c609719bSwdenk		CONFIG_OPTREX_BW
1007c609719bSwdenk
1008c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1009c609719bSwdenk			or
1010c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1011c609719bSwdenk			or
1012c609719bSwdenk			Hitachi	 SP14Q002
1013c609719bSwdenk
1014c609719bSwdenk			320x240. Black & white.
1015c609719bSwdenk
1016c609719bSwdenk		Normally display is black on white background; define
1017c609719bSwdenk		CFG_WHITE_ON_BLACK to get it inverted.
1018c609719bSwdenk
10197152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1020d791b1dcSwdenk
1021d791b1dcSwdenk		If this option is set, the environment is checked for
1022d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1023d791b1dcSwdenk		of logo, copyright and system information on the LCD
1024e94d2cd9Swdenk		is suppressed and the BMP image at the address
1025d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1026d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1027d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1028d791b1dcSwdenk		loaded very quickly after power-on.
1029d791b1dcSwdenk
103098f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
103198f4a3dfSStefan Roese
103298f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
103398f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
103498f4a3dfSStefan Roese		splashscreen support or the bmp command.
103598f4a3dfSStefan Roese
1036c29fdfc1Swdenk- Compression support:
1037c29fdfc1Swdenk		CONFIG_BZIP2
1038c29fdfc1Swdenk
1039c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1040c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1041c29fdfc1Swdenk		compressed images are supported.
1042c29fdfc1Swdenk
1043c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
1044c29fdfc1Swdenk		the malloc area (as defined by CFG_MALLOC_LEN) should
1045c29fdfc1Swdenk		be at least 4MB.
1046d791b1dcSwdenk
1047fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1048fc9c1727SLuigi 'Comio' Mantellini
1049fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1050fc9c1727SLuigi 'Comio' Mantellini		images is included.
1051fc9c1727SLuigi 'Comio' Mantellini
1052fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1053fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1054fc9c1727SLuigi 'Comio' Mantellini		formula:
1055fc9c1727SLuigi 'Comio' Mantellini
1056fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1057fc9c1727SLuigi 'Comio' Mantellini
1058fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1059fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1060fc9c1727SLuigi 'Comio' Mantellini
1061fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1062fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1063fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1064fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1065fc9c1727SLuigi 'Comio' Mantellini
1066fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1067fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
1068fc9c1727SLuigi 'Comio' Mantellini		the appropriate CFG_MALLOC_LEN value).
1069fc9c1727SLuigi 'Comio' Mantellini
107017ea1177Swdenk- MII/PHY support:
107117ea1177Swdenk		CONFIG_PHY_ADDR
107217ea1177Swdenk
107317ea1177Swdenk		The address of PHY on MII bus.
107417ea1177Swdenk
107517ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
107617ea1177Swdenk
107717ea1177Swdenk		The clock frequency of the MII bus
107817ea1177Swdenk
107917ea1177Swdenk		CONFIG_PHY_GIGE
108017ea1177Swdenk
108117ea1177Swdenk		If this option is set, support for speed/duplex
108211ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
108317ea1177Swdenk
108417ea1177Swdenk		CONFIG_PHY_RESET_DELAY
108517ea1177Swdenk
108617ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
108717ea1177Swdenk		reset before any MII register access is possible.
108817ea1177Swdenk		For such PHY, set this option to the usec delay
108917ea1177Swdenk		required. (minimum 300usec for LXT971A)
109017ea1177Swdenk
109117ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
109217ea1177Swdenk
109317ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
109417ea1177Swdenk		command issued before MII status register can be read
109517ea1177Swdenk
1096c609719bSwdenk- Ethernet address:
1097c609719bSwdenk		CONFIG_ETHADDR
1098c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1099c609719bSwdenk		CONFIG_ETH2ADDR
1100c609719bSwdenk		CONFIG_ETH3ADDR
1101c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1102c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1103c609719bSwdenk
110411ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
110511ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1106c609719bSwdenk		is not determined automatically.
1107c609719bSwdenk
1108c609719bSwdenk- IP address:
1109c609719bSwdenk		CONFIG_IPADDR
1110c609719bSwdenk
1111c609719bSwdenk		Define a default value for the IP address to use for
111211ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1113c609719bSwdenk		determined through e.g. bootp.
1114c609719bSwdenk
1115c609719bSwdenk- Server IP address:
1116c609719bSwdenk		CONFIG_SERVERIP
1117c609719bSwdenk
1118c609719bSwdenk		Defines a default value for the IP address of a TFTP
1119c609719bSwdenk		server to contact when using the "tftboot" command.
1120c609719bSwdenk
112153a5c424SDavid Updegraff- Multicast TFTP Mode:
112253a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
112353a5c424SDavid Updegraff
112453a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
112553a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
112611ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
112753a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
112853a5c424SDavid Updegraff		multicast group.
112953a5c424SDavid Updegraff
113053a5c424SDavid Updegraff		CONFIG_BOOTP_RANDOM_DELAY
1131c609719bSwdenk- BOOTP Recovery Mode:
1132c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1133c609719bSwdenk
1134c609719bSwdenk		If you have many targets in a network that try to
1135c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1136c609719bSwdenk		systems send out BOOTP requests at precisely the same
1137c609719bSwdenk		moment (which would happen for instance at recovery
1138c609719bSwdenk		from a power failure, when all systems will try to
1139c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1140c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1141c609719bSwdenk		inserted before sending out BOOTP requests. The
11426c33c785SWolfgang Denk		following delays are inserted then:
1143c609719bSwdenk
1144c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1145c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1146c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1147c609719bSwdenk		4th and following
1148c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1149c609719bSwdenk
1150fe389a82Sstroese- DHCP Advanced Options:
11511fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
11521fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1153fe389a82Sstroese
11541fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
11551fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
11561fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
11571fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
11581fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
11591fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
11601fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
11611fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
11621fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
11631fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
11641fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
11651fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
1166fe389a82Sstroese
11675d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
11685d110f0aSWilson Callan		environment variable, not the BOOTP server.
1169fe389a82Sstroese
1170fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1171fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1172fe389a82Sstroese		than one DNS serverip is offered to the client.
1173fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1174fe389a82Sstroese		serverip will be stored in the additional environment
1175fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1176fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
11771fe80d79SJon Loeliger		is defined.
1178fe389a82Sstroese
1179fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1180fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1181fe389a82Sstroese		need the hostname of the DHCP requester.
11825d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
11831fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
11841fe80d79SJon Loeliger		option 12 to the DHCP server.
1185fe389a82Sstroese
1186d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1187d9a2f416SAras Vaichas
1188d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1189d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1190d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1191d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1192d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1193d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1194d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1195d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1196d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1197d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1198d9a2f416SAras Vaichas		this delay.
1199d9a2f416SAras Vaichas
1200a3d991bdSwdenk - CDP Options:
1201a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1202a3d991bdSwdenk
1203a3d991bdSwdenk		The device id used in CDP trigger frames.
1204a3d991bdSwdenk
1205a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1206a3d991bdSwdenk
1207a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1208a3d991bdSwdenk		of the device.
1209a3d991bdSwdenk
1210a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1211a3d991bdSwdenk
1212a3d991bdSwdenk		A printf format string which contains the ascii name of
1213a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
121411ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1215a3d991bdSwdenk
1216a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1217a3d991bdSwdenk
1218a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1219a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1220a3d991bdSwdenk
1221a3d991bdSwdenk		CONFIG_CDP_VERSION
1222a3d991bdSwdenk
1223a3d991bdSwdenk		An ascii string containing the version of the software.
1224a3d991bdSwdenk
1225a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1226a3d991bdSwdenk
1227a3d991bdSwdenk		An ascii string containing the name of the platform.
1228a3d991bdSwdenk
1229a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1230a3d991bdSwdenk
1231a3d991bdSwdenk		A 32bit integer sent on the trigger.
1232a3d991bdSwdenk
1233a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1234a3d991bdSwdenk
1235a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1236a3d991bdSwdenk		device in .1 of milliwatts.
1237a3d991bdSwdenk
1238a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1239a3d991bdSwdenk
1240a3d991bdSwdenk		A byte containing the id of the VLAN.
1241a3d991bdSwdenk
1242c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1243c609719bSwdenk
1244c609719bSwdenk		Several configurations allow to display the current
1245c609719bSwdenk		status using a LED. For instance, the LED will blink
1246c609719bSwdenk		fast while running U-Boot code, stop blinking as
1247c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1248c609719bSwdenk		start blinking slow once the Linux kernel is running
1249c609719bSwdenk		(supported by a status LED driver in the Linux
1250c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1251c609719bSwdenk		feature in U-Boot.
1252c609719bSwdenk
1253c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1254c609719bSwdenk
1255c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1256c609719bSwdenk		on those systems that support this (optional)
1257c609719bSwdenk		feature, like the TQM8xxL modules.
1258c609719bSwdenk
1259c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1260c609719bSwdenk
1261b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1262b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
126311ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1264c609719bSwdenk
1265b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1266602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1267b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1268b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1269c609719bSwdenk		command line interface.
1270c609719bSwdenk
1271bb99ad6dSBen Warren		CONFIG_I2C_CMD_TREE is a recommended option that places
1272bb99ad6dSBen Warren		all I2C commands under a single 'i2c' root command.  The
1273bb99ad6dSBen Warren		older 'imm', 'imd', 'iprobe' etc. commands are considered
1274bb99ad6dSBen Warren		deprecated and may disappear in the future.
1275bb99ad6dSBen Warren
1276bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1277c609719bSwdenk
1278b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1279b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1280b37c7e5eSwdenk		support for I2C.
1281c609719bSwdenk
1282b37c7e5eSwdenk		There are several other quantities that must also be
1283b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1284c609719bSwdenk
1285b37c7e5eSwdenk		In both cases you will need to define CFG_I2C_SPEED
1286b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
1287b37c7e5eSwdenk		to run and CFG_I2C_SLAVE to be the address of this node (ie
128811ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1289c609719bSwdenk
1290b37c7e5eSwdenk		Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
129111ccc33fSMarcel Ziswiler		sets the CPU up as a master node and so its address should
1292b37c7e5eSwdenk		therefore be cleared to 0 (See, eg, MPC823e User's Manual
1293b37c7e5eSwdenk		p.16-473). So, set CFG_I2C_SLAVE to 0.
1294b37c7e5eSwdenk
1295b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1296b37c7e5eSwdenk
1297b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1298b37c7e5eSwdenk		then the following macros need to be defined (examples are
1299b37c7e5eSwdenk		from include/configs/lwmon.h):
1300c609719bSwdenk
1301c609719bSwdenk		I2C_INIT
1302c609719bSwdenk
1303b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1304c609719bSwdenk		controller or configure ports.
1305c609719bSwdenk
1306b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1307b37c7e5eSwdenk
1308c609719bSwdenk		I2C_PORT
1309c609719bSwdenk
1310c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1311c609719bSwdenk		assumes both bits are on the same port). Valid values
1312c609719bSwdenk		are 0..3 for ports A..D.
1313c609719bSwdenk
1314c609719bSwdenk		I2C_ACTIVE
1315c609719bSwdenk
1316c609719bSwdenk		The code necessary to make the I2C data line active
1317c609719bSwdenk		(driven).  If the data line is open collector, this
1318c609719bSwdenk		define can be null.
1319c609719bSwdenk
1320b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1321b37c7e5eSwdenk
1322c609719bSwdenk		I2C_TRISTATE
1323c609719bSwdenk
1324c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1325c609719bSwdenk		(inactive).  If the data line is open collector, this
1326c609719bSwdenk		define can be null.
1327c609719bSwdenk
1328b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1329b37c7e5eSwdenk
1330c609719bSwdenk		I2C_READ
1331c609719bSwdenk
1332c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1333c609719bSwdenk		FALSE if it is low.
1334c609719bSwdenk
1335b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1336b37c7e5eSwdenk
1337c609719bSwdenk		I2C_SDA(bit)
1338c609719bSwdenk
1339c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1340c609719bSwdenk		is FALSE, it clears it (low).
1341c609719bSwdenk
1342b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1343b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1344b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1345b37c7e5eSwdenk
1346c609719bSwdenk		I2C_SCL(bit)
1347c609719bSwdenk
1348c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1349c609719bSwdenk		is FALSE, it clears it (low).
1350c609719bSwdenk
1351b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1352b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1353b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1354b37c7e5eSwdenk
1355c609719bSwdenk		I2C_DELAY
1356c609719bSwdenk
1357c609719bSwdenk		This delay is invoked four times per clock cycle so this
1358c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1359b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1360b37c7e5eSwdenk		like:
1361b37c7e5eSwdenk
1362b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1363c609719bSwdenk
136447cd00faSwdenk		CFG_I2C_INIT_BOARD
136547cd00faSwdenk
136647cd00faSwdenk		When a board is reset during an i2c bus transfer
136747cd00faSwdenk		chips might think that the current transfer is still
136847cd00faSwdenk		in progress. On some boards it is possible to access
136947cd00faSwdenk		the i2c SCLK line directly, either by using the
137047cd00faSwdenk		processor pin as a GPIO or by having a second pin
137147cd00faSwdenk		connected to the bus. If this option is defined a
137247cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
137347cd00faSwdenk		is run early in the boot sequence.
137447cd00faSwdenk
137517ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
137617ea1177Swdenk
137717ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
137817ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
137917ea1177Swdenk		variable "i2cfast". (see also i2cfast)
138017ea1177Swdenk
1381bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1382bb99ad6dSBen Warren
1383bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1384bb99ad6dSBen Warren		must have a controller.  At any point in time, only one bus is
1385bb99ad6dSBen Warren		active.  To switch to a different bus, use the 'i2c dev' command.
1386bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1387bb99ad6dSBen Warren
1388bb99ad6dSBen Warren		CFG_I2C_NOPROBES
1389bb99ad6dSBen Warren
1390bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
1391bb99ad6dSBen Warren		when the 'i2c probe' command is issued (or 'iprobe' using the legacy
1392bb99ad6dSBen Warren		command).  If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device
1393bb99ad6dSBen Warren		pairs.	Otherwise, specify a 1D array of device addresses
1394bb99ad6dSBen Warren
1395bb99ad6dSBen Warren		e.g.
1396bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
1397bb99ad6dSBen Warren			#define CFG_I2C_NOPROBES	{0x50,0x68}
1398bb99ad6dSBen Warren
1399bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1400bb99ad6dSBen Warren
1401bb99ad6dSBen Warren			#define	CONFIG_I2C_MULTI_BUS
1402bb99ad6dSBen Warren			#define CFG_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1403bb99ad6dSBen Warren
1404bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1405bb99ad6dSBen Warren
1406be5e6181STimur Tabi		CFG_SPD_BUS_NUM
1407be5e6181STimur Tabi
1408be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1409be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1410be5e6181STimur Tabi
14110dc018ecSStefan Roese		CFG_RTC_BUS_NUM
14120dc018ecSStefan Roese
14130dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
14140dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
14150dc018ecSStefan Roese
14160dc018ecSStefan Roese		CFG_DTT_BUS_NUM
14170dc018ecSStefan Roese
14180dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
14190dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
14200dc018ecSStefan Roese
14219ebbb54fSVictor Gallardo		CFG_I2C_DTT_ADDR:
14229ebbb54fSVictor Gallardo
14239ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
14249ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
14259ebbb54fSVictor Gallardo		specified DTT device.
14269ebbb54fSVictor Gallardo
1427be5e6181STimur Tabi		CONFIG_FSL_I2C
1428be5e6181STimur Tabi
1429be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
14307817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1431be5e6181STimur Tabi
1432*67b23a32SHeiko Schocher		CONFIG_I2C_MUX
1433*67b23a32SHeiko Schocher
1434*67b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
1435*67b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
1436*67b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
1437*67b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
1438*67b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
1439*67b23a32SHeiko Schocher		the muxes to activate this new "bus".
1440*67b23a32SHeiko Schocher
1441*67b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
1442*67b23a32SHeiko Schocher		feature!
1443*67b23a32SHeiko Schocher
1444*67b23a32SHeiko Schocher		Example:
1445*67b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
1446*67b23a32SHeiko Schocher			The First mux with address 70 and channel 6
1447*67b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
1448*67b23a32SHeiko Schocher
1449*67b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
1450*67b23a32SHeiko Schocher
1451*67b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
1452*67b23a32SHeiko Schocher		of I2C Busses with muxes:
1453*67b23a32SHeiko Schocher
1454*67b23a32SHeiko Schocher		=> i2c bus
1455*67b23a32SHeiko Schocher		Busses reached over muxes:
1456*67b23a32SHeiko Schocher		Bus ID: 2
1457*67b23a32SHeiko Schocher		  reached over Mux(es):
1458*67b23a32SHeiko Schocher		    pca9544a@70 ch: 4
1459*67b23a32SHeiko Schocher		Bus ID: 3
1460*67b23a32SHeiko Schocher		  reached over Mux(es):
1461*67b23a32SHeiko Schocher		    pca9544a@70 ch: 6
1462*67b23a32SHeiko Schocher		    pca9544a@71 ch: 4
1463*67b23a32SHeiko Schocher		=>
1464*67b23a32SHeiko Schocher
1465*67b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
1466*67b23a32SHeiko Schocher		u-boot sends First the Commando to the mux@70 to enable
1467*67b23a32SHeiko Schocher		channel 6, and then the Commando to the mux@71 to enable
1468*67b23a32SHeiko Schocher		the channel 4.
1469*67b23a32SHeiko Schocher
1470*67b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
1471*67b23a32SHeiko Schocher		usual, to communicate with your I2C devices behind
1472*67b23a32SHeiko Schocher		the 2 muxes.
1473*67b23a32SHeiko Schocher
1474*67b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
1475*67b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
1476*67b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
1477*67b23a32SHeiko Schocher		to add this option to other architectures.
1478*67b23a32SHeiko Schocher
1479be5e6181STimur Tabi
1480c609719bSwdenk- SPI Support:	CONFIG_SPI
1481c609719bSwdenk
1482c609719bSwdenk		Enables SPI driver (so far only tested with
1483c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1484c609719bSwdenk		D/As on the SACSng board)
1485c609719bSwdenk
1486c609719bSwdenk		CONFIG_SPI_X
1487c609719bSwdenk
1488c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1489c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1490c609719bSwdenk
1491c609719bSwdenk		CONFIG_SOFT_SPI
1492c609719bSwdenk
1493c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1494c609719bSwdenk		using hardware support. This is a general purpose
1495c609719bSwdenk		driver that only requires three general I/O port pins
1496c609719bSwdenk		(two outputs, one input) to function. If this is
1497c609719bSwdenk		defined, the board configuration must define several
1498c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1499c609719bSwdenk		an example, see include/configs/sacsng.h.
1500c609719bSwdenk
150104a9e118SBen Warren		CONFIG_HARD_SPI
150204a9e118SBen Warren
150304a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
150404a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
150504a9e118SBen Warren		must define a list of chip-select function pointers.
150604a9e118SBen Warren		Currently supported on some MPC8xxx processors.  For an
150704a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
150804a9e118SBen Warren
150938254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
151038254f45SGuennadi Liakhovetski
151138254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
151238254f45SGuennadi Liakhovetski		SoCs. Currently only i.MX31 is supported.
151338254f45SGuennadi Liakhovetski
15140133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
15150133502eSMatthias Fuchs
15160133502eSMatthias Fuchs		Enables FPGA subsystem.
15170133502eSMatthias Fuchs
15180133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
15190133502eSMatthias Fuchs
15200133502eSMatthias Fuchs		Enables support for specific chip vendors.
15210133502eSMatthias Fuchs		(ALTERA, XILINX)
15220133502eSMatthias Fuchs
15230133502eSMatthias Fuchs		CONFIG_FPGA_<family>
15240133502eSMatthias Fuchs
15250133502eSMatthias Fuchs		Enables support for FPGA family.
15260133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
15270133502eSMatthias Fuchs
15280133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
1529c609719bSwdenk
1530c609719bSwdenk		Specify the number of FPGA devices to support.
1531c609719bSwdenk
1532c609719bSwdenk		CFG_FPGA_PROG_FEEDBACK
1533c609719bSwdenk
1534c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1535c609719bSwdenk
1536c609719bSwdenk		CFG_FPGA_CHECK_BUSY
1537c609719bSwdenk
1538c609719bSwdenk		Enable checks on FPGA configuration interface busy
1539c609719bSwdenk		status by the configuration function. This option
1540c609719bSwdenk		will require a board or device specific function to
1541c609719bSwdenk		be written.
1542c609719bSwdenk
1543c609719bSwdenk		CONFIG_FPGA_DELAY
1544c609719bSwdenk
1545c609719bSwdenk		If defined, a function that provides delays in the FPGA
1546c609719bSwdenk		configuration driver.
1547c609719bSwdenk
1548c609719bSwdenk		CFG_FPGA_CHECK_CTRLC
1549c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1550c609719bSwdenk
1551c609719bSwdenk		CFG_FPGA_CHECK_ERROR
1552c609719bSwdenk
1553c609719bSwdenk		Check for configuration errors during FPGA bitfile
1554c609719bSwdenk		loading. For example, abort during Virtex II
1555c609719bSwdenk		configuration if the INIT_B line goes low (which
1556c609719bSwdenk		indicated a CRC error).
1557c609719bSwdenk
1558c609719bSwdenk		CFG_FPGA_WAIT_INIT
1559c609719bSwdenk
1560c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1561c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1562c609719bSwdenk		FPGA configuration sequence. The default time is 500
156311ccc33fSMarcel Ziswiler		ms.
1564c609719bSwdenk
1565c609719bSwdenk		CFG_FPGA_WAIT_BUSY
1566c609719bSwdenk
1567c609719bSwdenk		Maximum time to wait for BUSY to deassert during
156811ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
1569c609719bSwdenk
1570c609719bSwdenk		CFG_FPGA_WAIT_CONFIG
1571c609719bSwdenk
1572c609719bSwdenk		Time to wait after FPGA configuration. The default is
157311ccc33fSMarcel Ziswiler		200 ms.
1574c609719bSwdenk
1575c609719bSwdenk- Configuration Management:
1576c609719bSwdenk		CONFIG_IDENT_STRING
1577c609719bSwdenk
1578c609719bSwdenk		If defined, this string will be added to the U-Boot
1579c609719bSwdenk		version information (U_BOOT_VERSION)
1580c609719bSwdenk
1581c609719bSwdenk- Vendor Parameter Protection:
1582c609719bSwdenk
1583c609719bSwdenk		U-Boot considers the values of the environment
1584c609719bSwdenk		variables "serial#" (Board Serial Number) and
15857152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
1586c609719bSwdenk		are set once by the board vendor / manufacturer, and
1587c609719bSwdenk		protects these variables from casual modification by
1588c609719bSwdenk		the user. Once set, these variables are read-only,
1589c609719bSwdenk		and write or delete attempts are rejected. You can
159011ccc33fSMarcel Ziswiler		change this behaviour:
1591c609719bSwdenk
1592c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
1593c609719bSwdenk		file, the write protection for vendor parameters is
159447cd00faSwdenk		completely disabled. Anybody can change or delete
1595c609719bSwdenk		these parameters.
1596c609719bSwdenk
1597c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
1598c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
159911ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
1600c609719bSwdenk		which can be changed exactly ONCE by the user. [The
1601c609719bSwdenk		serial# is unaffected by this, i. e. it remains
1602c609719bSwdenk		read-only.]
1603c609719bSwdenk
1604c609719bSwdenk- Protected RAM:
1605c609719bSwdenk		CONFIG_PRAM
1606c609719bSwdenk
1607c609719bSwdenk		Define this variable to enable the reservation of
1608c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
1609c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
1610c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
1611c609719bSwdenk		this default value by defining an environment
1612c609719bSwdenk		variable "pram" to the number of kB you want to
1613c609719bSwdenk		reserve. Note that the board info structure will
1614c609719bSwdenk		still show the full amount of RAM. If pRAM is
1615c609719bSwdenk		reserved, a new environment variable "mem" will
1616c609719bSwdenk		automatically be defined to hold the amount of
1617c609719bSwdenk		remaining RAM in a form that can be passed as boot
1618c609719bSwdenk		argument to Linux, for instance like that:
1619c609719bSwdenk
1620fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
1621c609719bSwdenk			saveenv
1622c609719bSwdenk
1623c609719bSwdenk		This way you can tell Linux not to use this memory,
1624c609719bSwdenk		either, which results in a memory region that will
1625c609719bSwdenk		not be affected by reboots.
1626c609719bSwdenk
1627c609719bSwdenk		*WARNING* If your board configuration uses automatic
1628c609719bSwdenk		detection of the RAM size, you must make sure that
1629c609719bSwdenk		this memory test is non-destructive. So far, the
1630c609719bSwdenk		following board configurations are known to be
1631c609719bSwdenk		"pRAM-clean":
1632c609719bSwdenk
1633c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1634c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
1635c609719bSwdenk			PCU_E, FLAGADM, TQM8260
1636c609719bSwdenk
1637c609719bSwdenk- Error Recovery:
1638c609719bSwdenk		CONFIG_PANIC_HANG
1639c609719bSwdenk
1640c609719bSwdenk		Define this variable to stop the system in case of a
1641c609719bSwdenk		fatal error, so that you have to reset it manually.
1642c609719bSwdenk		This is probably NOT a good idea for an embedded
164311ccc33fSMarcel Ziswiler		system where you want the system to reboot
1644c609719bSwdenk		automatically as fast as possible, but it may be
1645c609719bSwdenk		useful during development since you can try to debug
1646c609719bSwdenk		the conditions that lead to the situation.
1647c609719bSwdenk
1648c609719bSwdenk		CONFIG_NET_RETRY_COUNT
1649c609719bSwdenk
1650c609719bSwdenk		This variable defines the number of retries for
1651c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
1652c609719bSwdenk		before giving up the operation. If not defined, a
1653c609719bSwdenk		default value of 5 is used.
1654c609719bSwdenk
165540cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
165640cb90eeSGuennadi Liakhovetski
165740cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
165840cb90eeSGuennadi Liakhovetski
1659c609719bSwdenk- Command Interpreter:
16608078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
166104a85b3bSwdenk
166204a85b3bSwdenk		Enable auto completion of commands using TAB.
166304a85b3bSwdenk
16648078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
16658078f1a5SWolfgang Denk		for the "hush" shell.
16668078f1a5SWolfgang Denk
16678078f1a5SWolfgang Denk
1668c609719bSwdenk		CFG_HUSH_PARSER
1669c609719bSwdenk
1670c609719bSwdenk		Define this variable to enable the "hush" shell (from
1671c609719bSwdenk		Busybox) as command line interpreter, thus enabling
1672c609719bSwdenk		powerful command line syntax like
1673c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
1674c609719bSwdenk		constructs ("shell scripts").
1675c609719bSwdenk
1676c609719bSwdenk		If undefined, you get the old, much simpler behaviour
1677c609719bSwdenk		with a somewhat smaller memory footprint.
1678c609719bSwdenk
1679c609719bSwdenk
1680c609719bSwdenk		CFG_PROMPT_HUSH_PS2
1681c609719bSwdenk
1682c609719bSwdenk		This defines the secondary prompt string, which is
1683c609719bSwdenk		printed when the command interpreter needs more input
1684c609719bSwdenk		to complete a command. Usually "> ".
1685c609719bSwdenk
1686c609719bSwdenk	Note:
1687c609719bSwdenk
1688c609719bSwdenk		In the current implementation, the local variables
1689c609719bSwdenk		space and global environment variables space are
1690c609719bSwdenk		separated. Local variables are those you define by
16913b57fe0aSwdenk		simply typing `name=value'. To access a local
1692c609719bSwdenk		variable later on, you have write `$name' or
16933b57fe0aSwdenk		`${name}'; to execute the contents of a variable
16943b57fe0aSwdenk		directly type `$name' at the command prompt.
1695c609719bSwdenk
1696c609719bSwdenk		Global environment variables are those you use
1697c609719bSwdenk		setenv/printenv to work with. To run a command stored
1698c609719bSwdenk		in such a variable, you need to use the run command,
1699c609719bSwdenk		and you must not use the '$' sign to access them.
1700c609719bSwdenk
1701c609719bSwdenk		To store commands and special characters in a
1702c609719bSwdenk		variable, please use double quotation marks
1703c609719bSwdenk		surrounding the whole text of the variable, instead
1704c609719bSwdenk		of the backslashes before semicolons and special
1705c609719bSwdenk		symbols.
1706c609719bSwdenk
1707aa0c71acSWolfgang Denk- Commandline Editing and History:
1708aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
1709aa0c71acSWolfgang Denk
171011ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
1711aa0c71acSWolfgang Denk		commandline input operations
1712aa0c71acSWolfgang Denk
1713a8c7c708Swdenk- Default Environment:
1714c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
1715c609719bSwdenk
1716c609719bSwdenk		Define this to contain any number of null terminated
1717c609719bSwdenk		strings (variable = value pairs) that will be part of
17187152b1d0Swdenk		the default environment compiled into the boot image.
17192262cfeeSwdenk
1720c609719bSwdenk		For example, place something like this in your
1721c609719bSwdenk		board's config file:
1722c609719bSwdenk
1723c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
1724c609719bSwdenk			"myvar1=value1\0" \
1725c609719bSwdenk			"myvar2=value2\0"
1726c609719bSwdenk
1727c609719bSwdenk		Warning: This method is based on knowledge about the
1728c609719bSwdenk		internal format how the environment is stored by the
17292262cfeeSwdenk		U-Boot code. This is NOT an official, exported
1730c609719bSwdenk		interface! Although it is unlikely that this format
17317152b1d0Swdenk		will change soon, there is no guarantee either.
1732c609719bSwdenk		You better know what you are doing here.
1733c609719bSwdenk
1734c609719bSwdenk		Note: overly (ab)use of the default environment is
1735c609719bSwdenk		discouraged. Make sure to check other ways to preset
1736c609719bSwdenk		the environment like the autoscript function or the
1737c609719bSwdenk		boot command first.
1738c609719bSwdenk
1739a8c7c708Swdenk- DataFlash Support:
17402abbe075Swdenk		CONFIG_HAS_DATAFLASH
17412abbe075Swdenk
17422abbe075Swdenk		Defining this option enables DataFlash features and
17432abbe075Swdenk		allows to read/write in Dataflash via the standard
17442abbe075Swdenk		commands cp, md...
17452abbe075Swdenk
17463f85ce27Swdenk- SystemACE Support:
17473f85ce27Swdenk		CONFIG_SYSTEMACE
17483f85ce27Swdenk
17493f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
17503f85ce27Swdenk		chips attached via some sort of local bus. The address
175111ccc33fSMarcel Ziswiler		of the chip must also be defined in the
17523f85ce27Swdenk		CFG_SYSTEMACE_BASE macro. For example:
17533f85ce27Swdenk
17543f85ce27Swdenk		#define CONFIG_SYSTEMACE
17553f85ce27Swdenk		#define CFG_SYSTEMACE_BASE 0xf0000000
17563f85ce27Swdenk
17573f85ce27Swdenk		When SystemACE support is added, the "ace" device type
17583f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
17593f85ce27Swdenk
1760ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
1761ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
1762ecb0ccd9SWolfgang Denk
176328cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
1764ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
176528cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
1766ecb0ccd9SWolfgang Denk		number generator is used.
1767ecb0ccd9SWolfgang Denk
176828cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
176928cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
177028cb9375SWolfgang Denk		defined, the normal port 69 is used.
177128cb9375SWolfgang Denk
177228cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
1773ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
1774ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
1775ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
1776ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
1777ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
1778ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
1779ecb0ccd9SWolfgang Denk
1780a8c7c708Swdenk- Show boot progress:
1781c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
1782c609719bSwdenk
1783c609719bSwdenk		Defining this option allows to add some board-
1784c609719bSwdenk		specific code (calling a user-provided function
1785c609719bSwdenk		"show_boot_progress(int)") that enables you to show
1786c609719bSwdenk		the system's boot progress on some display (for
1787c609719bSwdenk		example, some LED's) on your board. At the moment,
1788c609719bSwdenk		the following checkpoints are implemented:
1789c609719bSwdenk
17904bae9090SBartlomiej Sieka- Automatic software updates via TFTP server
17914bae9090SBartlomiej Sieka		CONFIG_UPDATE_TFTP
17924bae9090SBartlomiej Sieka		CONFIG_UPDATE_TFTP_CNT_MAX
17934bae9090SBartlomiej Sieka		CONFIG_UPDATE_TFTP_MSEC_MAX
17944bae9090SBartlomiej Sieka
17954bae9090SBartlomiej Sieka		These options enable and control the auto-update feature;
17964bae9090SBartlomiej Sieka		for a more detailed description refer to doc/README.update.
17974bae9090SBartlomiej Sieka
17981372cce2SMarian BalakowiczLegacy uImage format:
17991372cce2SMarian Balakowicz
1800c609719bSwdenk  Arg	Where			When
1801c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
1802c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
1803c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
1804c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
1805c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
1806c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
1807c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
1808c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
1809c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
18101372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
1811c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
1812c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
1813c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
1814c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
18151372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
1816c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
18171372cce2SMarian Balakowicz
18181372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
18191372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
18201372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
18211372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
18221372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
18231372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
18241372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
182511ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
18261372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
18271372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
18281372cce2SMarian Balakowicz
18291372cce2SMarian Balakowicz   15	lib_<arch>/bootm.c	All preparation done, transferring control to OS
1830c609719bSwdenk
183163e73c9aSwdenk  -30	lib_ppc/board.c		Fatal error, hang the system
183263e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
183363e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
183463e73c9aSwdenk
1835566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
1836566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
1837566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
1838566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
1839566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
1840566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
1841566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
1842566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
1843566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
1844566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
1845566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
1846566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
1847566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
1848566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
1849566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
1850566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
1851566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
1852566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
1853566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
1854566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
1855566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
1856566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
1857566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
1858566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
1859566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
1860566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
1861566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
1862566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
1863566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
1864566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
1865566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
1866566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
1867566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
1868566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
1869566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
1870566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
1871566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
1872566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
1873566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
1874566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
1875566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
1876566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
1877566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
1878566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
1879566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
1880566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
1881566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
1882c609719bSwdenk
1883566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
1884c609719bSwdenk
1885566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
1886566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
1887566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
1888206c60cbSwdenk
1889566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
1890566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
189111ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
1892566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
1893566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
1894566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
1895566a494fSHeiko Schocher   83	common/cmd_net.c	running autoscript
1896566a494fSHeiko Schocher  -83	common/cmd_net.c	some error in automatic boot or autoscript
1897566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
1898c609719bSwdenk
18991372cce2SMarian BalakowiczFIT uImage format:
19001372cce2SMarian Balakowicz
19011372cce2SMarian Balakowicz  Arg	Where			When
19021372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
19031372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
19041372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
19051372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
19061372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
19071372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
1908f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
19091372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
19101372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
19111372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
19121372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
19131372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
191411ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
191511ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
19161372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
19171372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
19181372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
19191372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
19201372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
19211372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
19221372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
19231372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
19241372cce2SMarian Balakowicz
19251372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
19261372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
19271372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
192811ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
19291372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
19301372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
19311372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
19321372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
19331372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
19341372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
19351372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
19361372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
19371372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
19381372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
19391372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
19401372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
19411372cce2SMarian Balakowicz
194211ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
19431372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
19441372cce2SMarian Balakowicz
194511ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
19461372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
19471372cce2SMarian Balakowicz
194811ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
19491372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
19501372cce2SMarian Balakowicz
19511372cce2SMarian Balakowicz
1952c609719bSwdenkModem Support:
1953c609719bSwdenk--------------
1954c609719bSwdenk
195585ec0bccSwdenk[so far only for SMDK2400 and TRAB boards]
1956c609719bSwdenk
195711ccc33fSMarcel Ziswiler- Modem support enable:
1958c609719bSwdenk		CONFIG_MODEM_SUPPORT
1959c609719bSwdenk
1960c609719bSwdenk- RTS/CTS Flow control enable:
1961c609719bSwdenk		CONFIG_HWFLOW
1962c609719bSwdenk
1963c609719bSwdenk- Modem debug support:
1964c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
1965c609719bSwdenk
1966c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
1967c609719bSwdenk		for modem support. Useful only with BDI2000.
1968c609719bSwdenk
1969a8c7c708Swdenk- Interrupt support (PPC):
1970a8c7c708Swdenk
1971a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
1972a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
197311ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
1974a8c7c708Swdenk		should set decrementer_count to appropriate value. If
197511ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
1976a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
197711ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
1978a8c7c708Swdenk		specific handling. If board has watchdog / status_led
1979a8c7c708Swdenk		/ other_activity_monitor it works automatically from
1980a8c7c708Swdenk		general timer_interrupt().
1981a8c7c708Swdenk
1982c609719bSwdenk- General:
1983c609719bSwdenk
1984c609719bSwdenk		In the target system modem support is enabled when a
1985c609719bSwdenk		specific key (key combination) is pressed during
1986c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
198711ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
1988c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
1989c609719bSwdenk		function, returning 1 and thus enabling modem
1990c609719bSwdenk		initialization.
1991c609719bSwdenk
1992c609719bSwdenk		If there are no modem init strings in the
1993c609719bSwdenk		environment, U-Boot proceed to autoboot; the
1994c609719bSwdenk		previous output (banner, info printfs) will be
199511ccc33fSMarcel Ziswiler		suppressed, though.
1996c609719bSwdenk
1997c609719bSwdenk		See also: doc/README.Modem
1998c609719bSwdenk
1999c609719bSwdenk
2000c609719bSwdenkConfiguration Settings:
2001c609719bSwdenk-----------------------
2002c609719bSwdenk
2003c609719bSwdenk- CFG_LONGHELP: Defined when you want long help messages included;
2004c609719bSwdenk		undefine this when you're short of memory.
2005c609719bSwdenk
2006c609719bSwdenk- CFG_PROMPT:	This is what U-Boot prints on the console to
2007c609719bSwdenk		prompt for user input.
2008c609719bSwdenk
2009c609719bSwdenk- CFG_CBSIZE:	Buffer size for input from the Console
2010c609719bSwdenk
2011c609719bSwdenk- CFG_PBSIZE:	Buffer size for Console output
2012c609719bSwdenk
2013c609719bSwdenk- CFG_MAXARGS:	max. Number of arguments accepted for monitor commands
2014c609719bSwdenk
2015c609719bSwdenk- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
2016c609719bSwdenk		the application (usually a Linux kernel) when it is
2017c609719bSwdenk		booted
2018c609719bSwdenk
2019c609719bSwdenk- CFG_BAUDRATE_TABLE:
2020c609719bSwdenk		List of legal baudrate settings for this board.
2021c609719bSwdenk
2022c609719bSwdenk- CFG_CONSOLE_INFO_QUIET
2023c609719bSwdenk		Suppress display of console information at boot.
2024c609719bSwdenk
2025c609719bSwdenk- CFG_CONSOLE_IS_IN_ENV
2026c609719bSwdenk		If the board specific function
2027c609719bSwdenk			extern int overwrite_console (void);
2028c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2029c609719bSwdenk		serial port, else the settings in the environment are used.
2030c609719bSwdenk
2031c609719bSwdenk- CFG_CONSOLE_OVERWRITE_ROUTINE
2032c609719bSwdenk		Enable the call to overwrite_console().
2033c609719bSwdenk
2034c609719bSwdenk- CFG_CONSOLE_ENV_OVERWRITE
2035c609719bSwdenk		Enable overwrite of previous console environment settings.
2036c609719bSwdenk
2037c609719bSwdenk- CFG_MEMTEST_START, CFG_MEMTEST_END:
2038c609719bSwdenk		Begin and End addresses of the area used by the
2039c609719bSwdenk		simple memory test.
2040c609719bSwdenk
2041c609719bSwdenk- CFG_ALT_MEMTEST:
2042c609719bSwdenk		Enable an alternate, more extensive memory test.
2043c609719bSwdenk
20445f535fe1Swdenk- CFG_MEMTEST_SCRATCH:
20455f535fe1Swdenk		Scratch address used by the alternate memory test
20465f535fe1Swdenk		You only need to set this if address zero isn't writeable
20475f535fe1Swdenk
204814f73ca6SStefan Roese- CFG_MEM_TOP_HIDE (PPC only):
204914f73ca6SStefan Roese		If CFG_MEM_TOP_HIDE is defined in the board config header,
205014f73ca6SStefan Roese		this specified memory area will get subtracted from the top
205111ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
205214f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
205314f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
205414f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
20555e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
205614f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
20575e12e75dSStefan Roese		will have to get fixed in Linux additionally.
205814f73ca6SStefan Roese
205914f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
206014f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
206114f73ca6SStefan Roese		be touched.
206214f73ca6SStefan Roese
206314f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
206414f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
206514f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
206614f73ca6SStefan Roese		non page size aligned address and this could cause major
206714f73ca6SStefan Roese		problems.
206814f73ca6SStefan Roese
2069c609719bSwdenk- CFG_TFTP_LOADADDR:
2070c609719bSwdenk		Default load address for network file downloads
2071c609719bSwdenk
2072c609719bSwdenk- CFG_LOADS_BAUD_CHANGE:
2073c609719bSwdenk		Enable temporary baudrate change while serial download
2074c609719bSwdenk
2075c609719bSwdenk- CFG_SDRAM_BASE:
2076c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2077c609719bSwdenk
2078c609719bSwdenk- CFG_MBIO_BASE:
2079c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2080c609719bSwdenk		Cogent motherboard)
2081c609719bSwdenk
2082c609719bSwdenk- CFG_FLASH_BASE:
2083c609719bSwdenk		Physical start address of Flash memory.
2084c609719bSwdenk
2085c609719bSwdenk- CFG_MONITOR_BASE:
2086c609719bSwdenk		Physical start address of boot monitor code (set by
2087c609719bSwdenk		make config files to be same as the text base address
2088c609719bSwdenk		(TEXT_BASE) used when linking) - same as
2089c609719bSwdenk		CFG_FLASH_BASE when booting from flash.
2090c609719bSwdenk
2091c609719bSwdenk- CFG_MONITOR_LEN:
20923b57fe0aSwdenk		Size of memory reserved for monitor code, used to
20933b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
20943b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
20953b57fe0aSwdenk		flash sector.
2096c609719bSwdenk
2097c609719bSwdenk- CFG_MALLOC_LEN:
2098c609719bSwdenk		Size of DRAM reserved for malloc() use.
2099c609719bSwdenk
210015940c9aSStefan Roese- CFG_BOOTM_LEN:
210115940c9aSStefan Roese		Normally compressed uImages are limited to an
210215940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
210315940c9aSStefan Roese		you can define CFG_BOOTM_LEN in your board config file
210415940c9aSStefan Roese		to adjust this setting to your needs.
2105c609719bSwdenk
2106c609719bSwdenk- CFG_BOOTMAPSZ:
2107c609719bSwdenk		Maximum size of memory mapped by the startup code of
2108c609719bSwdenk		the Linux kernel; all data that must be processed by
21097d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
21107d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
21117d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
21127d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
21137d721e34SBartlomiej Sieka		and "bootm_low" + CFG_BOOTMAPSZ.
2114c609719bSwdenk
2115c609719bSwdenk- CFG_MAX_FLASH_BANKS:
2116c609719bSwdenk		Max number of Flash memory banks
2117c609719bSwdenk
2118c609719bSwdenk- CFG_MAX_FLASH_SECT:
2119c609719bSwdenk		Max number of sectors on a Flash chip
2120c609719bSwdenk
2121c609719bSwdenk- CFG_FLASH_ERASE_TOUT:
2122c609719bSwdenk		Timeout for Flash erase operations (in ms)
2123c609719bSwdenk
2124c609719bSwdenk- CFG_FLASH_WRITE_TOUT:
2125c609719bSwdenk		Timeout for Flash write operations (in ms)
2126c609719bSwdenk
21278564acf9Swdenk- CFG_FLASH_LOCK_TOUT
21288564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
21298564acf9Swdenk
21308564acf9Swdenk- CFG_FLASH_UNLOCK_TOUT
21318564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
21328564acf9Swdenk
21338564acf9Swdenk- CFG_FLASH_PROTECTION
21348564acf9Swdenk		If defined, hardware flash sectors protection is used
21358564acf9Swdenk		instead of U-Boot software protection.
21368564acf9Swdenk
2137c609719bSwdenk- CFG_DIRECT_FLASH_TFTP:
2138c609719bSwdenk
2139c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2140c609719bSwdenk		without this option such a download has to be
2141c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2142c609719bSwdenk		copy from RAM to flash.
2143c609719bSwdenk
2144c609719bSwdenk		The two-step approach is usually more reliable, since
2145c609719bSwdenk		you can check if the download worked before you erase
214611ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
214711ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2148c609719bSwdenk		downloaded image) this option may be very useful.
2149c609719bSwdenk
2150c609719bSwdenk- CFG_FLASH_CFI:
2151c609719bSwdenk		Define if the flash driver uses extra elements in the
21525653fc33Swdenk		common flash structure for storing flash geometry.
21535653fc33Swdenk
215400b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
21555653fc33Swdenk		This option also enables the building of the cfi_flash driver
21565653fc33Swdenk		in the drivers directory
215753cf9435Sstroese
215896ef831fSGuennadi Liakhovetski- CFG_FLASH_USE_BUFFER_WRITE
215996ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
216096ef831fSGuennadi Liakhovetski
216196ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
216296ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
216396ef831fSGuennadi Liakhovetski		write commands.
216496ef831fSGuennadi Liakhovetski
21655568e613SStefan Roese- CFG_FLASH_QUIET_TEST
21665568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
21675568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
21685568e613SStefan Roese		is useful, if some of the configured banks are only
21695568e613SStefan Roese		optionally available.
21705568e613SStefan Roese
21719a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
21729a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
21739a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
21749a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
21759a042e9cSJerry Van Baren
217653cf9435Sstroese- CFG_RX_ETH_BUFFER:
217711ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
217811ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
217953cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
218053cf9435Sstroese		buffers can be full shortly after enabling the interface
218111ccc33fSMarcel Ziswiler		on high Ethernet traffic.
218253cf9435Sstroese		Defaults to 4 if not defined.
2183c609719bSwdenk
2184c609719bSwdenkThe following definitions that deal with the placement and management
2185c609719bSwdenkof environment data (variable area); in general, we support the
2186c609719bSwdenkfollowing configurations:
2187c609719bSwdenk
21885a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2189c609719bSwdenk
2190c609719bSwdenk	Define this if the environment is in flash memory.
2191c609719bSwdenk
2192c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2193c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2194c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2195c609719bSwdenk	   sector" type flash chips, which have several smaller
2196c609719bSwdenk	   sectors at the start or the end. For instance, such a
2197c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2198c609719bSwdenk	   such a case you would place the environment in one of the
2199c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2200c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2201c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2202c609719bSwdenk	   between U-Boot and the environment.
2203c609719bSwdenk
22040e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2205c609719bSwdenk
2206c609719bSwdenk	   Offset of environment data (variable area) to the
2207c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2208c609719bSwdenk	   type flash chips the second sector can be used: the offset
2209c609719bSwdenk	   for this sector is given here.
2210c609719bSwdenk
22110e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
2212c609719bSwdenk
22130e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
2214c609719bSwdenk
2215c609719bSwdenk	   This is just another way to specify the start address of
2216c609719bSwdenk	   the flash sector containing the environment (instead of
22170e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
2218c609719bSwdenk
22190e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
2220c609719bSwdenk
2221c609719bSwdenk	   Size of the sector containing the environment.
2222c609719bSwdenk
2223c609719bSwdenk
2224c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2225c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2226c609719bSwdenk	   the environment.
2227c609719bSwdenk
22280e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2229c609719bSwdenk
22305a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
22310e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2232c609719bSwdenk	   of this flash sector for the environment. This saves
2233c609719bSwdenk	   memory for the RAM copy of the environment.
2234c609719bSwdenk
2235c609719bSwdenk	   It may also save flash memory if you decide to use this
2236c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2237c609719bSwdenk	   since then the remainder of the flash sector could be used
2238c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2239c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2240c609719bSwdenk	   updating the environment in flash makes it always
2241c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2242c609719bSwdenk	   wrong before the contents has been restored from a copy in
2243c609719bSwdenk	   RAM, your target system will be dead.
2244c609719bSwdenk
22450e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
22460e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
2247c609719bSwdenk
2248c609719bSwdenk	   These settings describe a second storage area used to hold
224911ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
22503e38691eSwdenk	   a valid backup copy in case there is a power failure during
2251c609719bSwdenk	   a "saveenv" operation.
2252c609719bSwdenk
2253c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2254c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2255c609719bSwdenkaccordingly!
2256c609719bSwdenk
2257c609719bSwdenk
22589314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
2259c609719bSwdenk
2260c609719bSwdenk	Define this if you have some non-volatile memory device
2261c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2262c609719bSwdenk	environment.
2263c609719bSwdenk
22640e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
22650e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2266c609719bSwdenk
226711ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
2268c609719bSwdenk	  want to use for environment. It is assumed that this memory
2269c609719bSwdenk	  can just be read and written to, without any special
2270c609719bSwdenk	  provision.
2271c609719bSwdenk
2272c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
2273c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
227411ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
2275c609719bSwdenkU-Boot will hang.
2276c609719bSwdenk
2277c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
2278c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
2279c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
2280c609719bSwdenkto save the current settings.
2281c609719bSwdenk
2282c609719bSwdenk
2283bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
2284c609719bSwdenk
2285c609719bSwdenk	Use this if you have an EEPROM or similar serial access
2286c609719bSwdenk	device and a driver for it.
2287c609719bSwdenk
22880e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
22890e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2290c609719bSwdenk
2291c609719bSwdenk	  These two #defines specify the offset and size of the
2292c609719bSwdenk	  environment area within the total memory of your EEPROM.
2293c609719bSwdenk
2294c609719bSwdenk	- CFG_I2C_EEPROM_ADDR:
2295c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
2296c609719bSwdenk	  The default address is zero.
2297c609719bSwdenk
2298c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_BITS:
2299c609719bSwdenk	  If defined, the number of bits used to address bytes in a
2300c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
2301c609719bSwdenk	  would require six bits.
2302c609719bSwdenk
2303c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_DELAY_MS:
2304c609719bSwdenk	  If defined, the number of milliseconds to delay between
2305c609719bSwdenk	  page writes.	The default is zero milliseconds.
2306c609719bSwdenk
2307c609719bSwdenk	- CFG_I2C_EEPROM_ADDR_LEN:
2308c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
2309c609719bSwdenk	  that this is NOT the chip address length!
2310c609719bSwdenk
23115cf91d6bSwdenk	- CFG_I2C_EEPROM_ADDR_OVERFLOW:
23125cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
23135cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
23145cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
23155cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
23165cf91d6bSwdenk	  byte chips.
23175cf91d6bSwdenk
23185cf91d6bSwdenk	  Note that we consider the length of the address field to
23195cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
23205cf91d6bSwdenk	  in the chip address.
23215cf91d6bSwdenk
2322c609719bSwdenk	- CFG_EEPROM_SIZE:
2323c609719bSwdenk	  The size in bytes of the EEPROM device.
2324c609719bSwdenk
2325c609719bSwdenk
2326057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
23275779d8d9Swdenk
23285779d8d9Swdenk	Define this if you have a DataFlash memory device which you
23295779d8d9Swdenk	want to use for the environment.
23305779d8d9Swdenk
23310e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
23320e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
23330e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
23345779d8d9Swdenk
23355779d8d9Swdenk	  These three #defines specify the offset and size of the
23365779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
23375779d8d9Swdenk	  at the specified address.
23385779d8d9Swdenk
233951bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
234013a5695bSwdenk
234113a5695bSwdenk	Define this if you have a NAND device which you want to use
234213a5695bSwdenk	for the environment.
234313a5695bSwdenk
23440e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
23450e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
234613a5695bSwdenk
234713a5695bSwdenk	  These two #defines specify the offset and size of the environment
234813a5695bSwdenk	  area within the first NAND device.
23495779d8d9Swdenk
23500e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET_REDUND
2351e443c944SMarkus Klotzbuecher
23520e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
2353e443c944SMarkus Klotzbuecher	  size used to hold a redundant copy of the environment data,
2354e443c944SMarkus Klotzbuecher	  so that there is a valid backup copy in case there is a
2355e443c944SMarkus Klotzbuecher	  power failure during a "saveenv" operation.
2356e443c944SMarkus Klotzbuecher
23570e8d1586SJean-Christophe PLAGNIOL-VILLARD	Note: CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND must be aligned
23580e8d1586SJean-Christophe PLAGNIOL-VILLARD	to a block boundary, and CONFIG_ENV_SIZE must be a multiple of
2359e443c944SMarkus Klotzbuecher	the NAND devices block size.
2360e443c944SMarkus Klotzbuecher
2361c609719bSwdenk- CFG_SPI_INIT_OFFSET
2362c609719bSwdenk
2363c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
2364c609719bSwdenk	area is used at an early stage (ROM part) if the environment
2365c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
2366c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
2367c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2368c609719bSwdenk	to be a good choice since it makes it far enough from the
2369c609719bSwdenk	start of the data area as well as from the stack pointer.
2370c609719bSwdenk
2371e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
2372c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
2373c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r()
2374c609719bSwdenkuntil then to read environment variables.
2375c609719bSwdenk
237685ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
237785ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
237885ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
237985ec0bccSwdenknecessary, because the first environment variable we need is the
238085ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
238185ec0bccSwdenkhave any device yet where we could complain.]
2382c609719bSwdenk
2383c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
2384c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
238585ec0bccSwdenkuse the "saveenv" command to store a valid environment.
2386c609719bSwdenk
2387fc3e2165Swdenk- CFG_FAULT_ECHO_LINK_DOWN:
2388fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
2389fc3e2165Swdenk
2390fc3e2165Swdenk		Note: If this option is active, then CFG_FAULT_MII_ADDR
2391fc3e2165Swdenk		      also needs to be defined.
2392fc3e2165Swdenk
2393fc3e2165Swdenk- CFG_FAULT_MII_ADDR:
2394fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
2395c609719bSwdenk
2396c40b2956Swdenk- CFG_64BIT_VSPRINTF:
2397c40b2956Swdenk		Makes vsprintf (and all *printf functions) support printing
2398c40b2956Swdenk		of 64bit values by using the L quantifier
2399c40b2956Swdenk
2400c40b2956Swdenk- CFG_64BIT_STRTOUL:
2401c40b2956Swdenk		Adds simple_strtoull that returns a 64bit value
2402c40b2956Swdenk
2403c609719bSwdenkLow Level (hardware related) configuration options:
2404dc7c9a1aSwdenk---------------------------------------------------
2405c609719bSwdenk
2406c609719bSwdenk- CFG_CACHELINE_SIZE:
2407c609719bSwdenk		Cache Line Size of the CPU.
2408c609719bSwdenk
2409c609719bSwdenk- CFG_DEFAULT_IMMR:
2410c609719bSwdenk		Default address of the IMMR after system reset.
24112535d602Swdenk
24122535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
24132535d602Swdenk		and RPXsuper) to be able to adjust the position of
24142535d602Swdenk		the IMMR register after a reset.
2415c609719bSwdenk
24167f6c2cbcSwdenk- Floppy Disk Support:
24177f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER
24187f6c2cbcSwdenk
24197f6c2cbcSwdenk		the default drive number (default value 0)
24207f6c2cbcSwdenk
24217f6c2cbcSwdenk		CFG_ISA_IO_STRIDE
24227f6c2cbcSwdenk
242311ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
24247f6c2cbcSwdenk		(default value 1)
24257f6c2cbcSwdenk
24267f6c2cbcSwdenk		CFG_ISA_IO_OFFSET
24277f6c2cbcSwdenk
24287f6c2cbcSwdenk		defines the offset of register from address. It
24297f6c2cbcSwdenk		depends on which part of the data bus is connected to
243011ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
24317f6c2cbcSwdenk
24327f6c2cbcSwdenk		If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
24337f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER are undefined, they take their
24347f6c2cbcSwdenk		default value.
24357f6c2cbcSwdenk
24367f6c2cbcSwdenk		if CFG_FDC_HW_INIT is defined, then the function
24377f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
24387f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
24397f6c2cbcSwdenk		source code. It is used to make hardware dependant
24407f6c2cbcSwdenk		initializations.
24417f6c2cbcSwdenk
244225d6712aSwdenk- CFG_IMMR:	Physical address of the Internal Memory.
244325d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
244425d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
2445c609719bSwdenk
2446c609719bSwdenk- CFG_INIT_RAM_ADDR:
2447c609719bSwdenk
24487152b1d0Swdenk		Start address of memory area that can be used for
2449c609719bSwdenk		initial data and stack; please note that this must be
2450c609719bSwdenk		writable memory that is working WITHOUT special
2451c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
2452c609719bSwdenk		will become available only after programming the
2453c609719bSwdenk		memory controller and running certain initialization
2454c609719bSwdenk		sequences.
2455c609719bSwdenk
2456c609719bSwdenk		U-Boot uses the following memory types:
2457c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2458c609719bSwdenk		- MPC824X: data cache
2459c609719bSwdenk		- PPC4xx:  data cache
2460c609719bSwdenk
246185ec0bccSwdenk- CFG_GBL_DATA_OFFSET:
2462c609719bSwdenk
2463c609719bSwdenk		Offset of the initial data structure in the memory
2464c609719bSwdenk		area defined by CFG_INIT_RAM_ADDR. Usually
246585ec0bccSwdenk		CFG_GBL_DATA_OFFSET is chosen such that the initial
2466c609719bSwdenk		data is located at the end of the available space
2467c609719bSwdenk		(sometimes written as (CFG_INIT_RAM_END -
2468c609719bSwdenk		CFG_INIT_DATA_SIZE), and the initial stack is just
2469c609719bSwdenk		below that area (growing from (CFG_INIT_RAM_ADDR +
247085ec0bccSwdenk		CFG_GBL_DATA_OFFSET) downward.
2471c609719bSwdenk
2472c609719bSwdenk	Note:
2473c609719bSwdenk		On the MPC824X (or other systems that use the data
2474c609719bSwdenk		cache for initial memory) the address chosen for
2475c609719bSwdenk		CFG_INIT_RAM_ADDR is basically arbitrary - it must
2476c609719bSwdenk		point to an otherwise UNUSED address space between
2477c609719bSwdenk		the top of RAM and the start of the PCI space.
2478c609719bSwdenk
2479c609719bSwdenk- CFG_SIUMCR:	SIU Module Configuration (11-6)
2480c609719bSwdenk
2481c609719bSwdenk- CFG_SYPCR:	System Protection Control (11-9)
2482c609719bSwdenk
2483c609719bSwdenk- CFG_TBSCR:	Time Base Status and Control (11-26)
2484c609719bSwdenk
2485c609719bSwdenk- CFG_PISCR:	Periodic Interrupt Status and Control (11-31)
2486c609719bSwdenk
2487c609719bSwdenk- CFG_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
2488c609719bSwdenk
2489c609719bSwdenk- CFG_SCCR:	System Clock and reset Control Register (15-27)
2490c609719bSwdenk
2491c609719bSwdenk- CFG_OR_TIMING_SDRAM:
2492c609719bSwdenk		SDRAM timing
2493c609719bSwdenk
2494c609719bSwdenk- CFG_MAMR_PTA:
2495c609719bSwdenk		periodic timer for refresh
2496c609719bSwdenk
2497c609719bSwdenk- CFG_DER:	Debug Event Register (37-47)
2498c609719bSwdenk
2499c609719bSwdenk- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
2500c609719bSwdenk  CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
2501c609719bSwdenk  CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
2502c609719bSwdenk  CFG_BR1_PRELIM:
2503c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2504c609719bSwdenk
2505c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
2506c609719bSwdenk  CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
2507c609719bSwdenk  CFG_OR3_PRELIM, CFG_BR3_PRELIM:
2508c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2509c609719bSwdenk
2510c609719bSwdenk- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
2511c609719bSwdenk  CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
2512c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
2513c609719bSwdenk		Prescaler definitions (SDRAM timing)
2514c609719bSwdenk
2515c609719bSwdenk- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
2516c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
2517c609719bSwdenk		define relocation offset in DPRAM [DSP2]
2518c609719bSwdenk
2519b423d055SHeiko Schocher- CFG_SMC_UCODE_PATCH, CFG_SMC_DPMEM_OFFSET [0x1FC0]:
2520b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
2521b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
2522b423d055SHeiko Schocher
2523c609719bSwdenk- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
2524c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
2525c609719bSwdenk		define relocation offset in DPRAM [SCC4]
2526c609719bSwdenk
2527c609719bSwdenk- CFG_USE_OSCCLK:
2528c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
2529c609719bSwdenk		wrong setting might damage your board. Read
2530c609719bSwdenk		doc/README.MBX before setting this variable!
2531c609719bSwdenk
2532ea909b76Swdenk- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
2533ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
2534ea909b76Swdenk		(Power On Self Tests). This definition overrides
2535ea909b76Swdenk		#define'd default value in commproc.h resp.
2536ea909b76Swdenk		cpm_8260.h.
2537ea909b76Swdenk
25385d232d0eSwdenk- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
25395d232d0eSwdenk  CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
25405d232d0eSwdenk  CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
25415d232d0eSwdenk  CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
25425d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
25435d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
25445d232d0eSwdenk  CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,
25455d232d0eSwdenk  CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
25465d232d0eSwdenk		Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
25475d232d0eSwdenk
2548bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
2549218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
2550218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
2551218ca724SWolfgang Denk
2552bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
2553bb99ad6dSBen Warren		I2C address of the SPD EEPROM
2554bb99ad6dSBen Warren
2555bb99ad6dSBen Warren- CFG_SPD_BUS_NUM
2556218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
2557218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
2558218ca724SWolfgang Denk		to something your driver can deal with.
2559bb99ad6dSBen Warren
25602ad6b513STimur Tabi- CFG_83XX_DDR_USES_CS0
2561218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
2562218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
25632ad6b513STimur Tabi
25642ad6b513STimur Tabi- CFG_83XX_DDR_USES_CS0
2565218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
2566218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
25672ad6b513STimur Tabi
2568c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
2569c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
2570c26e454dSwdenk
2571c26e454dSwdenk- CONFIG_FEC[12]_PHY
2572c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
25736e592385Swdenk		to the given FEC; i. e.
2574c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
2575c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
2576c26e454dSwdenk
2577c26e454dSwdenk		When set to -1, means to probe for first available.
2578c26e454dSwdenk
2579c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
2580c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
2581c26e454dSwdenk		(so program the FEC to ignore it).
2582c26e454dSwdenk
2583c26e454dSwdenk- CONFIG_RMII
2584c26e454dSwdenk		Enable RMII mode for all FECs.
2585c26e454dSwdenk		Note that this is a global option, we can't
2586c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
2587c26e454dSwdenk
25885cf91d6bSwdenk- CONFIG_CRC32_VERIFY
25895cf91d6bSwdenk		Add a verify option to the crc32 command.
25905cf91d6bSwdenk		The syntax is:
25915cf91d6bSwdenk
25925cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
25935cf91d6bSwdenk
25945cf91d6bSwdenk		Where address/count indicate a memory area
25955cf91d6bSwdenk		and crc32 is the correct crc32 which the
25965cf91d6bSwdenk		area should have.
25975cf91d6bSwdenk
259856523f12Swdenk- CONFIG_LOOPW
259956523f12Swdenk		Add the "loopw" memory command. This only takes effect if
2600602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
260156523f12Swdenk
26027b466641Sstroese- CONFIG_MX_CYCLIC
26037b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
26047b466641Sstroese		"md/mw" commands.
26057b466641Sstroese		Examples:
26067b466641Sstroese
26077b466641Sstroese		=> mdc.b 10 4 500
26087b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
26097b466641Sstroese
26107b466641Sstroese		=> mwc.l 100 12345678 10
26117b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
26127b466641Sstroese
26137b466641Sstroese		This only takes effect if the memory commands are activated
2614602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
26157b466641Sstroese
26168aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
26178aa1a2d1Swdenk- CONFIG_SKIP_RELOCATE_UBOOT
26188aa1a2d1Swdenk
26198aa1a2d1Swdenk		[ARM only] If these variables are defined, then
26208aa1a2d1Swdenk		certain low level initializations (like setting up
26218aa1a2d1Swdenk		the memory controller) are omitted and/or U-Boot does
26228aa1a2d1Swdenk		not relocate itself into RAM.
26238aa1a2d1Swdenk		Normally these variables MUST NOT be defined. The
26248aa1a2d1Swdenk		only exception is when U-Boot is loaded (to RAM) by
26258aa1a2d1Swdenk		some other boot loader or by a debugger which
262611ccc33fSMarcel Ziswiler		performs these initializations itself.
26278aa1a2d1Swdenk
2628400558b5Swdenk
2629c609719bSwdenkBuilding the Software:
2630c609719bSwdenk======================
2631c609719bSwdenk
2632218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
2633218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
2634218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
2635218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
2636218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
2637218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
2638c609719bSwdenk
2639218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
2640218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
2641218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
2642218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
2643218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
2644c609719bSwdenk
2645218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
2646218ca724SWolfgang Denk	$ export CROSS_COMPILE
2647c609719bSwdenk
2648c609719bSwdenkU-Boot is intended to be simple to build. After installing the
2649c609719bSwdenksources you must configure U-Boot for one specific board type. This
2650c609719bSwdenkis done by typing:
2651c609719bSwdenk
2652c609719bSwdenk	make NAME_config
2653c609719bSwdenk
2654218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
2655218ca724SWolfgang Denkrations; see the main Makefile for supported names.
265654387ac9Swdenk
2657c609719bSwdenkNote: for some board special configuration names may exist; check if
2658c609719bSwdenk      additional information is available from the board vendor; for
26592729af9dSwdenk      instance, the TQM823L systems are available without (standard)
26602729af9dSwdenk      or with LCD support. You can select such additional "features"
266111ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
2662c609719bSwdenk
26632729af9dSwdenk      make TQM823L_config
26642729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
2665c609719bSwdenk
2666c609719bSwdenk      make TQM823L_LCD_config
2667c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
2668c609719bSwdenk
2669c609719bSwdenk      etc.
2670c609719bSwdenk
2671c609719bSwdenk
2672c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
26737152b1d0Swdenkimages ready for download to / installation on your system:
2674c609719bSwdenk
2675c609719bSwdenk- "u-boot.bin" is a raw binary image
2676c609719bSwdenk- "u-boot" is an image in ELF binary format
2677c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
2678c609719bSwdenk
2679baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
2680baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
2681baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
2682baf31249SMarian Balakowicz
2683baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
2684baf31249SMarian Balakowicz
2685baf31249SMarian Balakowicz	make O=/tmp/build distclean
2686baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
2687baf31249SMarian Balakowicz	make O=/tmp/build all
2688baf31249SMarian Balakowicz
2689baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
2690baf31249SMarian Balakowicz
2691baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
2692baf31249SMarian Balakowicz	make distclean
2693baf31249SMarian Balakowicz	make NAME_config
2694baf31249SMarian Balakowicz	make all
2695baf31249SMarian Balakowicz
2696baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
2697baf31249SMarian Balakowiczvariable.
2698baf31249SMarian Balakowicz
2699c609719bSwdenk
2700c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
2701c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
2702c609719bSwdenknative "make".
2703c609719bSwdenk
2704c609719bSwdenk
2705c609719bSwdenkIf the system board that you have is not listed, then you will need
2706c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
2707c609719bSwdenksteps:
2708c609719bSwdenk
2709c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
271085ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
271185ec0bccSwdenk    entries as examples. Note that here and at many other places
27127152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
271385ec0bccSwdenk    keep this order.
2714c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
271585ec0bccSwdenk    files you need. In your board directory, you will need at least
271685ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
271785ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
271885ec0bccSwdenk    your board
2719c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
2720c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
272185ec0bccSwdenk4.  Run "make <board>_config" with your new name.
2722c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
2723c609719bSwdenk    to be installed on your target system.
272485ec0bccSwdenk6.  Debug and solve any problems that might arise.
2725c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
2726c609719bSwdenk
2727c609719bSwdenk
2728c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
2729c609719bSwdenk==============================================================
2730c609719bSwdenk
2731c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
2732c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
2733c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
2734c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
2735218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
2736c609719bSwdenk
2737c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
2738c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
2739c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
2740c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
2741c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
27427152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
2743218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
2744218ca724SWolfgang Denkyou can type
2745c609719bSwdenk
2746c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
2747c609719bSwdenk
2748c609719bSwdenkor to build on a native PowerPC system you can type
2749c609719bSwdenk
2750c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
2751c609719bSwdenk
2752218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
2753218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
2754218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
2755218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
2756218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
2757218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
2758218ca724SWolfgang Denkvariable. For example:
2759baf31249SMarian Balakowicz
2760baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
2761baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
2762baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
2763baf31249SMarian Balakowicz
2764218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
2765218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
2766218ca724SWolfgang Denkduring the whole build process.
2767baf31249SMarian Balakowicz
2768baf31249SMarian Balakowicz
2769c609719bSwdenkSee also "U-Boot Porting Guide" below.
2770c609719bSwdenk
2771c609719bSwdenk
2772c609719bSwdenkMonitor Commands - Overview:
2773c609719bSwdenk============================
2774c609719bSwdenk
2775c609719bSwdenkgo	- start application at address 'addr'
2776c609719bSwdenkrun	- run commands in an environment variable
2777c609719bSwdenkbootm	- boot application image from memory
2778c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
2779c609719bSwdenktftpboot- boot image via network using TFTP protocol
2780c609719bSwdenk	       and env variables "ipaddr" and "serverip"
2781c609719bSwdenk	       (and eventually "gatewayip")
2782c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
2783c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
2784c609719bSwdenkloads	- load S-Record file over serial line
2785c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
2786c609719bSwdenkmd	- memory display
2787c609719bSwdenkmm	- memory modify (auto-incrementing)
2788c609719bSwdenknm	- memory modify (constant address)
2789c609719bSwdenkmw	- memory write (fill)
2790c609719bSwdenkcp	- memory copy
2791c609719bSwdenkcmp	- memory compare
2792c609719bSwdenkcrc32	- checksum calculation
2793c609719bSwdenkimd	- i2c memory display
2794c609719bSwdenkimm	- i2c memory modify (auto-incrementing)
2795c609719bSwdenkinm	- i2c memory modify (constant address)
2796c609719bSwdenkimw	- i2c memory write (fill)
2797c609719bSwdenkicrc32	- i2c checksum calculation
2798c609719bSwdenkiprobe	- probe to discover valid I2C chip addresses
2799c609719bSwdenkiloop	- infinite loop on address range
2800c609719bSwdenkisdram	- print SDRAM configuration information
2801c609719bSwdenksspi	- SPI utility commands
2802c609719bSwdenkbase	- print or set address offset
2803c609719bSwdenkprintenv- print environment variables
2804c609719bSwdenksetenv	- set environment variables
2805c609719bSwdenksaveenv - save environment variables to persistent storage
2806c609719bSwdenkprotect - enable or disable FLASH write protection
2807c609719bSwdenkerase	- erase FLASH memory
2808c609719bSwdenkflinfo	- print FLASH memory information
2809c609719bSwdenkbdinfo	- print Board Info structure
2810c609719bSwdenkiminfo	- print header information for application image
2811c609719bSwdenkconinfo - print console devices and informations
2812c609719bSwdenkide	- IDE sub-system
2813c609719bSwdenkloop	- infinite loop on address range
281456523f12Swdenkloopw	- infinite write loop on address range
2815c609719bSwdenkmtest	- simple RAM test
2816c609719bSwdenkicache	- enable or disable instruction cache
2817c609719bSwdenkdcache	- enable or disable data cache
2818c609719bSwdenkreset	- Perform RESET of the CPU
2819c609719bSwdenkecho	- echo args to console
2820c609719bSwdenkversion - print monitor version
2821c609719bSwdenkhelp	- print online help
2822c609719bSwdenk?	- alias for 'help'
2823c609719bSwdenk
2824c609719bSwdenk
2825c609719bSwdenkMonitor Commands - Detailed Description:
2826c609719bSwdenk========================================
2827c609719bSwdenk
2828c609719bSwdenkTODO.
2829c609719bSwdenk
2830c609719bSwdenkFor now: just type "help <command>".
2831c609719bSwdenk
2832c609719bSwdenk
2833c609719bSwdenkEnvironment Variables:
2834c609719bSwdenk======================
2835c609719bSwdenk
2836c609719bSwdenkU-Boot supports user configuration using Environment Variables which
2837c609719bSwdenkcan be made persistent by saving to Flash memory.
2838c609719bSwdenk
2839c609719bSwdenkEnvironment Variables are set using "setenv", printed using
2840c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
2841c609719bSwdenkwithout a value can be used to delete a variable from the
2842c609719bSwdenkenvironment. As long as you don't save the environment you are
2843c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
2844c609719bSwdenkenvironment is erased by accident, a default environment is provided.
2845c609719bSwdenk
2846c609719bSwdenkSome configuration options can be set using Environment Variables:
2847c609719bSwdenk
2848c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
2849c609719bSwdenk
2850c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
2851c609719bSwdenk
2852c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
2853c609719bSwdenk
2854c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
2855c609719bSwdenk
2856c609719bSwdenk  bootfile	- Name of the image to load with TFTP
2857c609719bSwdenk
28587d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
28597d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
28607d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
28617d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
28627d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
28637d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
286411ccc33fSMarcel Ziswiler		  kernel -- see the description of CFG_BOOTMAPSZ.
28657d721e34SBartlomiej Sieka
28667d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
28677d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
28687d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
28697d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
28707d721e34SBartlomiej Sieka		  environment variable.
28717d721e34SBartlomiej Sieka
28724bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
28734bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
28744bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
28754bae9090SBartlomiej Sieka
2876c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
2877c609719bSwdenk		  "bootp" will just load perform a lookup of the
2878c609719bSwdenk		  configuration from the BOOTP server, but not try to
2879c609719bSwdenk		  load any image using TFTP
2880c609719bSwdenk
28813310c549SMarian Balakowicz  autoscript	- if set to "yes" commands like "loadb", "loady",
28823310c549SMarian Balakowicz		  "bootp", "tftpb", "rarpboot" and "nfs" will attempt
28833310c549SMarian Balakowicz		  to automatically run script images (by internally
28843310c549SMarian Balakowicz		  calling "autoscript").
28853310c549SMarian Balakowicz
28863310c549SMarian Balakowicz  autoscript_uname - if script image is in a format (FIT) this
28873310c549SMarian Balakowicz		     variable is used to get script subimage unit name.
28883310c549SMarian Balakowicz
2889c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
2890c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
2891c609719bSwdenk		  be automatically started (by internally calling
2892c609719bSwdenk		  "bootm")
2893c609719bSwdenk
28944a6fd34bSwdenk		  If set to "no", a standalone image passed to the
28954a6fd34bSwdenk		  "bootm" command will be copied to the load address
28964a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
28974a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
28984a6fd34bSwdenk		  data.
28994a6fd34bSwdenk
290017ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
290117ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
290217ea1177Swdenk		  mode (400kHZ). This environment variable is used in
290317ea1177Swdenk		  initialization code. So, for changes to be effective
290417ea1177Swdenk		  it must be saved and board must be reset.
290517ea1177Swdenk
2906c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
2907c609719bSwdenk		  If this variable is not set, initrd images will be
2908c609719bSwdenk		  copied to the highest possible address in RAM; this
2909c609719bSwdenk		  is usually what you want since it allows for
2910c609719bSwdenk		  maximum initrd size. If for some reason you want to
2911c609719bSwdenk		  make sure that the initrd image is loaded below the
2912c609719bSwdenk		  CFG_BOOTMAPSZ limit, you can set this environment
2913c609719bSwdenk		  variable to a value of "no" or "off" or "0".
2914c609719bSwdenk		  Alternatively, you can set it to a maximum upper
2915c609719bSwdenk		  address to use (U-Boot will still check that it
2916c609719bSwdenk		  does not overwrite the U-Boot stack and data).
2917c609719bSwdenk
2918c609719bSwdenk		  For instance, when you have a system with 16 MB
29197152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
2920c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
2921c609719bSwdenk		  the "bootargs" variable. However, now you must make
29227152b1d0Swdenk		  sure that the initrd image is placed in the first
2923c609719bSwdenk		  12 MB as well - this can be done with
2924c609719bSwdenk
2925c609719bSwdenk		  setenv initrd_high 00c00000
2926c609719bSwdenk
292738b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
292838b99261Swdenk		  indication to U-Boot that all addresses are legal
292938b99261Swdenk		  for the Linux kernel, including addresses in flash
293038b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
293138b99261Swdenk		  ramdisk at all. This may be useful to reduce the
293238b99261Swdenk		  boot time on your system, but requires that this
293338b99261Swdenk		  feature is supported by your Linux kernel.
293438b99261Swdenk
2935c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
2936c609719bSwdenk
2937c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
2938dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
2939c609719bSwdenk
2940c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
2941c609719bSwdenk
2942c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
2943c609719bSwdenk
2944c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
2945c609719bSwdenk
2946c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
2947c609719bSwdenk
2948c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
2949c609719bSwdenk
2950a3d991bdSwdenk  ethprime	- When CONFIG_NET_MULTI is enabled controls which
2951a3d991bdSwdenk		  interface is used first.
2952a3d991bdSwdenk
2953a3d991bdSwdenk  ethact	- When CONFIG_NET_MULTI is enabled controls which
2954a3d991bdSwdenk		  interface is currently active. For example you
2955a3d991bdSwdenk		  can do the following
2956a3d991bdSwdenk
2957a3d991bdSwdenk		  => setenv ethact FEC ETHERNET
2958a3d991bdSwdenk		  => ping 192.168.0.1 # traffic sent on FEC ETHERNET
2959a3d991bdSwdenk		  => setenv ethact SCC ETHERNET
2960a3d991bdSwdenk		  => ping 10.0.0.1 # traffic sent on SCC ETHERNET
2961a3d991bdSwdenk
2962e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
2963e1692577SMatthias Fuchs		  available network interfaces.
2964e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
2965e1692577SMatthias Fuchs
2966a3d991bdSwdenk   netretry	- When set to "no" each network operation will
2967a3d991bdSwdenk		  either succeed or fail without retrying.
29686e592385Swdenk		  When set to "once" the network operation will
29696e592385Swdenk		  fail when all the available network interfaces
29706e592385Swdenk		  are tried once without success.
2971a3d991bdSwdenk		  Useful on scripts which control the retry operation
2972a3d991bdSwdenk		  themselves.
2973a3d991bdSwdenk
2974a1cf027aSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- see CONFIG_IXP4XX_NPE_EXT_UCOD
297511ccc33fSMarcel Ziswiler		  if set load address for the NPE microcode
2976a1cf027aSJean-Christophe PLAGNIOL-VILLARD
297728cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
2978ecb0ccd9SWolfgang Denk		  UDP source port.
2979ecb0ccd9SWolfgang Denk
298028cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
298128cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
298228cb9375SWolfgang Denk
2983a3d991bdSwdenk   vlan		- When set to a value < 4095 the traffic over
298411ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
2985a3d991bdSwdenk		  VLAN tagged frames.
2986c609719bSwdenk
2987c609719bSwdenkThe following environment variables may be used and automatically
2988c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
2989c609719bSwdenkdepending the information provided by your boot server:
2990c609719bSwdenk
2991c609719bSwdenk  bootfile	- see above
2992c609719bSwdenk  dnsip		- IP address of your Domain Name Server
2993fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
2994c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
2995c609719bSwdenk  hostname	- Target hostname
2996c609719bSwdenk  ipaddr	- see above
2997c609719bSwdenk  netmask	- Subnet Mask
2998c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
2999c609719bSwdenk  serverip	- see above
3000c609719bSwdenk
3001c609719bSwdenk
3002c609719bSwdenkThere are two special Environment Variables:
3003c609719bSwdenk
3004c609719bSwdenk  serial#	- contains hardware identification information such
3005c609719bSwdenk		  as type string and/or serial number
3006c609719bSwdenk  ethaddr	- Ethernet address
3007c609719bSwdenk
3008c609719bSwdenkThese variables can be set only once (usually during manufacturing of
3009c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
3010c609719bSwdenkonce they have been set once.
3011c609719bSwdenk
3012c609719bSwdenk
3013c1551ea8SstroeseFurther special Environment Variables:
3014c1551ea8Sstroese
3015c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
3016c1551ea8Sstroese		  with the "version" command. This variable is
3017c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
3018c1551ea8Sstroese
3019c1551ea8Sstroese
3020c609719bSwdenkPlease note that changes to some configuration parameters may take
3021c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
3022c609719bSwdenk
3023c609719bSwdenk
3024f07771ccSwdenkCommand Line Parsing:
3025f07771ccSwdenk=====================
3026f07771ccSwdenk
3027f07771ccSwdenkThere are two different command line parsers available with U-Boot:
30287152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
3029f07771ccSwdenk
3030f07771ccSwdenkOld, simple command line parser:
3031f07771ccSwdenk--------------------------------
3032f07771ccSwdenk
3033f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
3034f07771ccSwdenk- several commands on one line, separated by ';'
3035fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
3036f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
3037f07771ccSwdenk  for example:
3038fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
3039f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
3040f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3041f07771ccSwdenk
3042f07771ccSwdenkHush shell:
3043f07771ccSwdenk-----------
3044f07771ccSwdenk
3045f07771ccSwdenk- similar to Bourne shell, with control structures like
3046f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
3047f07771ccSwdenk  until...do...done, ...
3048f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
3049f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
3050f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
3051f07771ccSwdenk  command
3052f07771ccSwdenk
3053f07771ccSwdenkGeneral rules:
3054f07771ccSwdenk--------------
3055f07771ccSwdenk
3056f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
3057f07771ccSwdenk    command) contains several commands separated by semicolon, and
3058f07771ccSwdenk    one of these commands fails, then the remaining commands will be
3059f07771ccSwdenk    executed anyway.
3060f07771ccSwdenk
3061f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
306211ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
3063f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
3064f07771ccSwdenk    variables are not executed.
3065f07771ccSwdenk
3066c609719bSwdenkNote for Redundant Ethernet Interfaces:
3067c609719bSwdenk=======================================
3068c609719bSwdenk
306911ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
3070c609719bSwdenksuch configurations and is capable of automatic selection of a
30717152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
3072c609719bSwdenk
3073c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
3074c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3075c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
3076c609719bSwdenk
3077c609719bSwdenkIf the network interface stores some valid MAC address (for instance
3078c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
3079c609719bSwdenkding setting in the environment; if the corresponding environment
3080c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
3081c609719bSwdenk
3082c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
3083c609719bSwdenk  environment, the SROM's address is used.
3084c609719bSwdenk
3085c609719bSwdenko If there is no valid address in the SROM, and a definition in the
3086c609719bSwdenk  environment exists, then the value from the environment variable is
3087c609719bSwdenk  used.
3088c609719bSwdenk
3089c609719bSwdenko If both the SROM and the environment contain a MAC address, and
3090c609719bSwdenk  both addresses are the same, this MAC address is used.
3091c609719bSwdenk
3092c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
3093c609719bSwdenk  addresses differ, the value from the environment is used and a
3094c609719bSwdenk  warning is printed.
3095c609719bSwdenk
3096c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
3097c609719bSwdenk  is raised.
3098c609719bSwdenk
3099c609719bSwdenk
3100c609719bSwdenkImage Formats:
3101c609719bSwdenk==============
3102c609719bSwdenk
31033310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
31043310c549SMarian Balakowiczimages in two formats:
31053310c549SMarian Balakowicz
31063310c549SMarian BalakowiczNew uImage format (FIT)
31073310c549SMarian Balakowicz-----------------------
31083310c549SMarian Balakowicz
31093310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
31103310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
31113310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
31123310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
31133310c549SMarian Balakowicz
31143310c549SMarian Balakowicz
31153310c549SMarian BalakowiczOld uImage format
31163310c549SMarian Balakowicz-----------------
31173310c549SMarian Balakowicz
31183310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
31193310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
31203310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
3121c609719bSwdenk
3122c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3123c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3124f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3125f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3126f5ed9e39SPeter Tyser  INTEGRITY).
31277b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
31283d1e8a9dSwdenk  IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
31297b64fef3SWolfgang Denk  Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
3130c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
3131c609719bSwdenk* Load Address
3132c609719bSwdenk* Entry Point
3133c609719bSwdenk* Image Name
3134c609719bSwdenk* Image Timestamp
3135c609719bSwdenk
3136c609719bSwdenkThe header is marked by a special Magic Number, and both the header
3137c609719bSwdenkand the data portions of the image are secured against corruption by
3138c609719bSwdenkCRC32 checksums.
3139c609719bSwdenk
3140c609719bSwdenk
3141c609719bSwdenkLinux Support:
3142c609719bSwdenk==============
3143c609719bSwdenk
3144c609719bSwdenkAlthough U-Boot should support any OS or standalone application
31457152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
3146c609719bSwdenkU-Boot.
3147c609719bSwdenk
3148c609719bSwdenkU-Boot includes many features that so far have been part of some
3149c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
3150c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
3151c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
31527152b1d0Swdenkserves several purposes:
3153c609719bSwdenk
3154c609719bSwdenk- the same features can be used for other OS or standalone
3155c609719bSwdenk  applications (for instance: using compressed images to reduce the
3156c609719bSwdenk  Flash memory footprint)
3157c609719bSwdenk
3158c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
31597152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
3160c609719bSwdenk
3161c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
3162c609719bSwdenk  images; of course this also means that different kernel images can
3163c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
3164c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
3165c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
3166c609719bSwdenk  software is easier now.
3167c609719bSwdenk
3168c609719bSwdenk
3169c609719bSwdenkLinux HOWTO:
3170c609719bSwdenk============
3171c609719bSwdenk
3172c609719bSwdenkPorting Linux to U-Boot based systems:
3173c609719bSwdenk---------------------------------------
3174c609719bSwdenk
3175c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
3176c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
3177c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
3178c609719bSwdenkLinux :-).
3179c609719bSwdenk
3180c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
3181c609719bSwdenk
3182c609719bSwdenkJust make sure your machine specific header file (for instance
3183c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
31841dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
31851dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
31861dc30693SMarkus Heidelbergas your U-Boot configuration in CFG_IMMR.
3187c609719bSwdenk
3188c609719bSwdenk
3189c609719bSwdenkConfiguring the Linux kernel:
3190c609719bSwdenk-----------------------------
3191c609719bSwdenk
3192c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
3193c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
3194c609719bSwdenk
3195c609719bSwdenk
3196c609719bSwdenkBuilding a Linux Image:
3197c609719bSwdenk-----------------------
3198c609719bSwdenk
319924ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
320024ee89b9Swdenknot used. If you use recent kernel source, a new build target
320124ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
320224ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
320324ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
320424ee89b9Swdenk100% compatible format.
3205c609719bSwdenk
3206c609719bSwdenkExample:
3207c609719bSwdenk
3208c609719bSwdenk	make TQM850L_config
3209c609719bSwdenk	make oldconfig
3210c609719bSwdenk	make dep
321124ee89b9Swdenk	make uImage
3212c609719bSwdenk
321324ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
321424ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
321524ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
3216c609719bSwdenk
321724ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
321824ee89b9Swdenk
321924ee89b9Swdenk* convert the kernel into a raw binary image:
322024ee89b9Swdenk
322124ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
322224ee89b9Swdenk				 -R .note -R .comment \
322324ee89b9Swdenk				 -S vmlinux linux.bin
322424ee89b9Swdenk
322524ee89b9Swdenk* compress the binary image:
322624ee89b9Swdenk
322724ee89b9Swdenk	gzip -9 linux.bin
322824ee89b9Swdenk
322924ee89b9Swdenk* package compressed binary image for U-Boot:
323024ee89b9Swdenk
323124ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
323224ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
323324ee89b9Swdenk		-d linux.bin.gz uImage
323424ee89b9Swdenk
323524ee89b9Swdenk
323624ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
323724ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
323824ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
323924ee89b9Swdenkbyte header containing information about target architecture,
324024ee89b9Swdenkoperating system, image type, compression method, entry points, time
324124ee89b9Swdenkstamp, CRC32 checksums, etc.
324224ee89b9Swdenk
324324ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
324424ee89b9Swdenkprint the header information, or to build new images.
3245c609719bSwdenk
3246c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
3247c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
3248c609719bSwdenkchecksum verification:
3249c609719bSwdenk
3250c609719bSwdenk	tools/mkimage -l image
3251c609719bSwdenk	  -l ==> list image header information
3252c609719bSwdenk
3253c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
3254c609719bSwdenkfrom a "data file" which is used as image payload:
3255c609719bSwdenk
3256c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3257c609719bSwdenk		      -n name -d data_file image
3258c609719bSwdenk	  -A ==> set architecture to 'arch'
3259c609719bSwdenk	  -O ==> set operating system to 'os'
3260c609719bSwdenk	  -T ==> set image type to 'type'
3261c609719bSwdenk	  -C ==> set compression type 'comp'
3262c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
3263c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
3264c609719bSwdenk	  -n ==> set image name to 'name'
3265c609719bSwdenk	  -d ==> use image data from 'datafile'
3266c609719bSwdenk
326769459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
326869459791Swdenkaddress (0x00000000), but the entry point address depends on the
326969459791Swdenkkernel version:
3270c609719bSwdenk
3271c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
327224ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
3273c609719bSwdenk
3274c609719bSwdenkSo a typical call to build a U-Boot image would read:
3275c609719bSwdenk
327624ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
327724ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
327824ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
327924ee89b9Swdenk	> examples/uImage.TQM850L
328024ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3281c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3282c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3283c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3284c609719bSwdenk	Load Address: 0x00000000
328524ee89b9Swdenk	Entry Point:  0x00000000
3286c609719bSwdenk
3287c609719bSwdenkTo verify the contents of the image (or check for corruption):
3288c609719bSwdenk
328924ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
329024ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3291c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3292c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3293c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3294c609719bSwdenk	Load Address: 0x00000000
329524ee89b9Swdenk	Entry Point:  0x00000000
3296c609719bSwdenk
3297c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
3298c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
3299c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
3300c609719bSwdenkneed to be uncompressed:
3301c609719bSwdenk
330224ee89b9Swdenk	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
330324ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
330424ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
330524ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
330624ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
330724ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3308c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3309c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
3310c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
3311c609719bSwdenk	Load Address: 0x00000000
331224ee89b9Swdenk	Entry Point:  0x00000000
3313c609719bSwdenk
3314c609719bSwdenk
3315c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
3316c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
3317c609719bSwdenk
3318c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
3319c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
3320c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3321c609719bSwdenk	Image Name:   Simple Ramdisk Image
3322c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
3323c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
3324c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
3325c609719bSwdenk	Load Address: 0x00000000
3326c609719bSwdenk	Entry Point:  0x00000000
3327c609719bSwdenk
3328c609719bSwdenk
3329c609719bSwdenkInstalling a Linux Image:
3330c609719bSwdenk-------------------------
3331c609719bSwdenk
3332c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
3333c609719bSwdenkyou must convert the image to S-Record format:
3334c609719bSwdenk
3335c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
3336c609719bSwdenk
3337c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
3338c609719bSwdenkimage header, so the resulting S-Record file will be relative to
3339c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
3340c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
3341c609719bSwdenkcommand.
3342c609719bSwdenk
3343c609719bSwdenkExample: install the image to address 0x40100000 (which on the
3344c609719bSwdenkTQM8xxL is in the first Flash bank):
3345c609719bSwdenk
3346c609719bSwdenk	=> erase 40100000 401FFFFF
3347c609719bSwdenk
3348c609719bSwdenk	.......... done
3349c609719bSwdenk	Erased 8 sectors
3350c609719bSwdenk
3351c609719bSwdenk	=> loads 40100000
3352c609719bSwdenk	## Ready for S-Record download ...
3353c609719bSwdenk	~>examples/image.srec
3354c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3355c609719bSwdenk	...
3356c609719bSwdenk	15989 15990 15991 15992
3357c609719bSwdenk	[file transfer complete]
3358c609719bSwdenk	[connected]
3359c609719bSwdenk	## Start Addr = 0x00000000
3360c609719bSwdenk
3361c609719bSwdenk
3362c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
3363c609719bSwdenkthis includes a checksum verification so you can be sure no data
3364c609719bSwdenkcorruption happened:
3365c609719bSwdenk
3366c609719bSwdenk	=> imi 40100000
3367c609719bSwdenk
3368c609719bSwdenk	## Checking Image at 40100000 ...
3369c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3370c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3371c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3372c609719bSwdenk	   Load Address: 00000000
3373c609719bSwdenk	   Entry Point:	 0000000c
3374c609719bSwdenk	   Verifying Checksum ... OK
3375c609719bSwdenk
3376c609719bSwdenk
3377c609719bSwdenkBoot Linux:
3378c609719bSwdenk-----------
3379c609719bSwdenk
3380c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
3381c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
3382c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
3383c609719bSwdenkparameters. You can check and modify this variable using the
3384c609719bSwdenk"printenv" and "setenv" commands:
3385c609719bSwdenk
3386c609719bSwdenk
3387c609719bSwdenk	=> printenv bootargs
3388c609719bSwdenk	bootargs=root=/dev/ram
3389c609719bSwdenk
3390c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3391c609719bSwdenk
3392c609719bSwdenk	=> printenv bootargs
3393c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3394c609719bSwdenk
3395c609719bSwdenk	=> bootm 40020000
3396c609719bSwdenk	## Booting Linux kernel at 40020000 ...
3397c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
3398c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3399c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
3400c609719bSwdenk	   Load Address: 00000000
3401c609719bSwdenk	   Entry Point:	 0000000c
3402c609719bSwdenk	   Verifying Checksum ... OK
3403c609719bSwdenk	   Uncompressing Kernel Image ... OK
3404c609719bSwdenk	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
3405c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3406c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3407c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3408c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3409c609719bSwdenk	...
3410c609719bSwdenk
341111ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
34127152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
3413c609719bSwdenkformat!) to the "bootm" command:
3414c609719bSwdenk
3415c609719bSwdenk	=> imi 40100000 40200000
3416c609719bSwdenk
3417c609719bSwdenk	## Checking Image at 40100000 ...
3418c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3419c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3420c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3421c609719bSwdenk	   Load Address: 00000000
3422c609719bSwdenk	   Entry Point:	 0000000c
3423c609719bSwdenk	   Verifying Checksum ... OK
3424c609719bSwdenk
3425c609719bSwdenk	## Checking Image at 40200000 ...
3426c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3427c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3428c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3429c609719bSwdenk	   Load Address: 00000000
3430c609719bSwdenk	   Entry Point:	 00000000
3431c609719bSwdenk	   Verifying Checksum ... OK
3432c609719bSwdenk
3433c609719bSwdenk	=> bootm 40100000 40200000
3434c609719bSwdenk	## Booting Linux kernel at 40100000 ...
3435c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3436c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3437c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3438c609719bSwdenk	   Load Address: 00000000
3439c609719bSwdenk	   Entry Point:	 0000000c
3440c609719bSwdenk	   Verifying Checksum ... OK
3441c609719bSwdenk	   Uncompressing Kernel Image ... OK
3442c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
3443c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3444c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3445c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3446c609719bSwdenk	   Load Address: 00000000
3447c609719bSwdenk	   Entry Point:	 00000000
3448c609719bSwdenk	   Verifying Checksum ... OK
3449c609719bSwdenk	   Loading Ramdisk ... OK
3450c609719bSwdenk	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
3451c609719bSwdenk	Boot arguments: root=/dev/ram
3452c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3453c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3454c609719bSwdenk	...
3455c609719bSwdenk	RAMDISK: Compressed image found at block 0
3456c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
3457c609719bSwdenk
3458c609719bSwdenk	bash#
3459c609719bSwdenk
34600267768eSMatthew McClintockBoot Linux and pass a flat device tree:
34610267768eSMatthew McClintock-----------
34620267768eSMatthew McClintock
34630267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
34640267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
34650267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
34660267768eSMatthew McClintockflat device tree:
34670267768eSMatthew McClintock
34680267768eSMatthew McClintock=> print oftaddr
34690267768eSMatthew McClintockoftaddr=0x300000
34700267768eSMatthew McClintock=> print oft
34710267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
34720267768eSMatthew McClintock=> tftp $oftaddr $oft
34730267768eSMatthew McClintockSpeed: 1000, full duplex
34740267768eSMatthew McClintockUsing TSEC0 device
34750267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
34760267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
34770267768eSMatthew McClintockLoad address: 0x300000
34780267768eSMatthew McClintockLoading: #
34790267768eSMatthew McClintockdone
34800267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
34810267768eSMatthew McClintock=> tftp $loadaddr $bootfile
34820267768eSMatthew McClintockSpeed: 1000, full duplex
34830267768eSMatthew McClintockUsing TSEC0 device
34840267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
34850267768eSMatthew McClintockFilename 'uImage'.
34860267768eSMatthew McClintockLoad address: 0x200000
34870267768eSMatthew McClintockLoading:############
34880267768eSMatthew McClintockdone
34890267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
34900267768eSMatthew McClintock=> print loadaddr
34910267768eSMatthew McClintockloadaddr=200000
34920267768eSMatthew McClintock=> print oftaddr
34930267768eSMatthew McClintockoftaddr=0x300000
34940267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
34950267768eSMatthew McClintock## Booting image at 00200000 ...
34960267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
34970267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
34980267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
34990267768eSMatthew McClintock   Load Address: 00000000
35000267768eSMatthew McClintock   Entry Point:	 00000000
35010267768eSMatthew McClintock   Verifying Checksum ... OK
35020267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
35030267768eSMatthew McClintockBooting using flat device tree at 0x300000
35040267768eSMatthew McClintockUsing MPC85xx ADS machine description
35050267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
35060267768eSMatthew McClintock[snip]
35070267768eSMatthew McClintock
35080267768eSMatthew McClintock
35096069ff26SwdenkMore About U-Boot Image Types:
35106069ff26Swdenk------------------------------
35116069ff26Swdenk
35126069ff26SwdenkU-Boot supports the following image types:
35136069ff26Swdenk
35146069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
35156069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
35166069ff26Swdenk	well) you can continue to work in U-Boot after return from
35176069ff26Swdenk	the Standalone Program.
35186069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
35196069ff26Swdenk	will take over control completely. Usually these programs
35206069ff26Swdenk	will install their own set of exception handlers, device
35216069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
35226069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
35236069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
35246069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
35256069ff26Swdenk	being started.
35266069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
35276069ff26Swdenk	(Linux) kernel image and one or more data images like
35286069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
35296069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
35306069ff26Swdenk	server provides just a single image file, but you want to get
35316069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
35326069ff26Swdenk
35336069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
35346069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
35356069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
35366069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
35376069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
35386069ff26Swdenk	a multiple of 4 bytes).
35396069ff26Swdenk
35406069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
35416069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
35426069ff26Swdenk	flash memory.
35436069ff26Swdenk
35446069ff26Swdenk   "Script files" are command sequences that will be executed by
35456069ff26Swdenk	U-Boot's command interpreter; this feature is especially
35466069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
35476069ff26Swdenk	as command interpreter.
35486069ff26Swdenk
3549c609719bSwdenk
3550c609719bSwdenkStandalone HOWTO:
3551c609719bSwdenk=================
3552c609719bSwdenk
3553c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
3554c609719bSwdenkrun "standalone" applications, which can use some resources of
3555c609719bSwdenkU-Boot like console I/O functions or interrupt services.
3556c609719bSwdenk
3557c609719bSwdenkTwo simple examples are included with the sources:
3558c609719bSwdenk
3559c609719bSwdenk"Hello World" Demo:
3560c609719bSwdenk-------------------
3561c609719bSwdenk
3562c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
3563c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
3564c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
3565c609719bSwdenklike that:
3566c609719bSwdenk
3567c609719bSwdenk	=> loads
3568c609719bSwdenk	## Ready for S-Record download ...
3569c609719bSwdenk	~>examples/hello_world.srec
3570c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
3571c609719bSwdenk	[file transfer complete]
3572c609719bSwdenk	[connected]
3573c609719bSwdenk	## Start Addr = 0x00040004
3574c609719bSwdenk
3575c609719bSwdenk	=> go 40004 Hello World! This is a test.
3576c609719bSwdenk	## Starting application at 0x00040004 ...
3577c609719bSwdenk	Hello World
3578c609719bSwdenk	argc = 7
3579c609719bSwdenk	argv[0] = "40004"
3580c609719bSwdenk	argv[1] = "Hello"
3581c609719bSwdenk	argv[2] = "World!"
3582c609719bSwdenk	argv[3] = "This"
3583c609719bSwdenk	argv[4] = "is"
3584c609719bSwdenk	argv[5] = "a"
3585c609719bSwdenk	argv[6] = "test."
3586c609719bSwdenk	argv[7] = "<NULL>"
3587c609719bSwdenk	Hit any key to exit ...
3588c609719bSwdenk
3589c609719bSwdenk	## Application terminated, rc = 0x0
3590c609719bSwdenk
3591c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
3592c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
3593c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
3594c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
3595c609719bSwdenkcharacter, but this is just a demo program. The application can be
3596c609719bSwdenkcontrolled by the following keys:
3597c609719bSwdenk
3598c609719bSwdenk	? - print current values og the CPM Timer registers
3599c609719bSwdenk	b - enable interrupts and start timer
3600c609719bSwdenk	e - stop timer and disable interrupts
3601c609719bSwdenk	q - quit application
3602c609719bSwdenk
3603c609719bSwdenk	=> loads
3604c609719bSwdenk	## Ready for S-Record download ...
3605c609719bSwdenk	~>examples/timer.srec
3606c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
3607c609719bSwdenk	[file transfer complete]
3608c609719bSwdenk	[connected]
3609c609719bSwdenk	## Start Addr = 0x00040004
3610c609719bSwdenk
3611c609719bSwdenk	=> go 40004
3612c609719bSwdenk	## Starting application at 0x00040004 ...
3613c609719bSwdenk	TIMERS=0xfff00980
3614c609719bSwdenk	Using timer 1
3615c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
3616c609719bSwdenk
3617c609719bSwdenkHit 'b':
3618c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
3619c609719bSwdenk	Enabling timer
3620c609719bSwdenkHit '?':
3621c609719bSwdenk	[q, b, e, ?] ........
3622c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3623c609719bSwdenkHit '?':
3624c609719bSwdenk	[q, b, e, ?] .
3625c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3626c609719bSwdenkHit '?':
3627c609719bSwdenk	[q, b, e, ?] .
3628c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3629c609719bSwdenkHit '?':
3630c609719bSwdenk	[q, b, e, ?] .
3631c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3632c609719bSwdenkHit 'e':
3633c609719bSwdenk	[q, b, e, ?] ...Stopping timer
3634c609719bSwdenkHit 'q':
3635c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
3636c609719bSwdenk
3637c609719bSwdenk
363885ec0bccSwdenkMinicom warning:
363985ec0bccSwdenk================
364085ec0bccSwdenk
36417152b1d0SwdenkOver time, many people have reported problems when trying to use the
364285ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
364385ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
3644f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
364585ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
364685ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
364785ec0bccSwdenk
364852f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
364952f52c14Swdenkconfiguration to your "File transfer protocols" section:
365052f52c14Swdenk
365152f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
365252f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
365352f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
365452f52c14Swdenk
365552f52c14Swdenk
3656c609719bSwdenkNetBSD Notes:
3657c609719bSwdenk=============
3658c609719bSwdenk
3659c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
3660c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
3661c609719bSwdenk
3662c609719bSwdenkBuilding requires a cross environment; it is known to work on
3663c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3664c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
3665c609719bSwdenkNote that the cross-powerpc package does not install include files;
3666c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
3667c609719bSwdenkmissing.  This file has to be installed and patched manually:
3668c609719bSwdenk
3669c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
3670c609719bSwdenk	# mkdir powerpc
3671c609719bSwdenk	# ln -s powerpc machine
3672c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3673c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
3674c609719bSwdenk
3675c609719bSwdenkNative builds *don't* work due to incompatibilities between native
3676c609719bSwdenkand U-Boot include files.
3677c609719bSwdenk
3678c609719bSwdenkBooting assumes that (the first part of) the image booted is a
3679c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
3680c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
3681c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
36822a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
3683c609719bSwdenk
3684c609719bSwdenk
3685c609719bSwdenkImplementation Internals:
3686c609719bSwdenk=========================
3687c609719bSwdenk
3688c609719bSwdenkThe following is not intended to be a complete description of every
3689c609719bSwdenkimplementation detail. However, it should help to understand the
3690c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
3691c609719bSwdenkhardware.
3692c609719bSwdenk
3693c609719bSwdenk
3694c609719bSwdenkInitial Stack, Global Data:
3695c609719bSwdenk---------------------------
3696c609719bSwdenk
3697c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
3698c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
3699c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
3700c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
3701c609719bSwdenkis not initialized as zero. To be able to get a C environment working
3702c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
3703c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
3704c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
3705c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
3706c609719bSwdenklocked as (mis-) used as memory, etc.
3707c609719bSwdenk
37087152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
370943d9616cSwdenk	u-boot-users mailing list:
371043d9616cSwdenk
371143d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
371243d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
371343d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
371443d9616cSwdenk	...
371543d9616cSwdenk
371643d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
371743d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
371843d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
371943d9616cSwdenk	is that the cache is being used as a temporary supply of
372043d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
372111ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
372243d9616cSwdenk	can see how this works by studying the cache architecture and
372343d9616cSwdenk	operation in the architecture and processor-specific manuals.
372443d9616cSwdenk
372543d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
372643d9616cSwdenk	is another option for the system designer to use as an
372711ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
372843d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
372943d9616cSwdenk	board designers haven't used it for something that would
373043d9616cSwdenk	cause you grief during the initial boot! It is frequently not
373143d9616cSwdenk	used.
373243d9616cSwdenk
373343d9616cSwdenk	CFG_INIT_RAM_ADDR should be somewhere that won't interfere
373443d9616cSwdenk	with your processor/board/system design. The default value
373543d9616cSwdenk	you will find in any recent u-boot distribution in
37368a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
373743d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
373843d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
373943d9616cSwdenk	that are supposed to respond to that address! That code in
374043d9616cSwdenk	start.S has been around a while and should work as is when
374143d9616cSwdenk	you get the config right.
374243d9616cSwdenk
374343d9616cSwdenk	-Chris Hallinan
374443d9616cSwdenk	DS4.COM, Inc.
374543d9616cSwdenk
3746c609719bSwdenkIt is essential to remember this, since it has some impact on the C
3747c609719bSwdenkcode for the initialization procedures:
3748c609719bSwdenk
3749c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
3750c609719bSwdenk  to write it.
3751c609719bSwdenk
375211ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
3753c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
37547152b1d0Swdenk  zation is performed later (when relocating to RAM).
3755c609719bSwdenk
3756c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
3757c609719bSwdenk  that.
3758c609719bSwdenk
3759c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
3760c609719bSwdenknormal global data to share information beween the code. But it
3761c609719bSwdenkturned out that the implementation of U-Boot can be greatly
3762c609719bSwdenksimplified by making a global data structure (gd_t) available to all
3763c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
3764c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
3765c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
3766c609719bSwdenkplace a pointer (gd) to the global data into a register which we
3767c609719bSwdenkreserve for this purpose.
3768c609719bSwdenk
37697152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
3770c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
3771c609719bSwdenkGCC's implementation.
3772c609719bSwdenk
3773c609719bSwdenkFor PowerPC, the following registers have specific use:
3774c609719bSwdenk	R1:	stack pointer
3775e7670f6cSWolfgang Denk	R2:	reserved for system use
3776c609719bSwdenk	R3-R4:	parameter passing and return values
3777c609719bSwdenk	R5-R10: parameter passing
3778c609719bSwdenk	R13:	small data area pointer
3779c609719bSwdenk	R30:	GOT pointer
3780c609719bSwdenk	R31:	frame pointer
3781c609719bSwdenk
3782c609719bSwdenk	(U-Boot also uses R14 as internal GOT pointer.)
3783c609719bSwdenk
3784e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
3785c609719bSwdenk
3786c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
3787c609719bSwdenk    address of the global data structure is known at compile time),
3788c609719bSwdenk    but it turned out that reserving a register results in somewhat
3789c609719bSwdenk    smaller code - although the code savings are not that big (on
3790c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
3791c609719bSwdenk    624 text + 127 data).
3792c609719bSwdenk
37934c58eb55SMike FrysingerOn Blackfin, the normal C ABI (except for P5) is followed as documented here:
37944c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
37954c58eb55SMike Frysinger
37964c58eb55SMike Frysinger    ==> U-Boot will use P5 to hold a pointer to the global data
37974c58eb55SMike Frysinger
3798c609719bSwdenkOn ARM, the following registers are used:
3799c609719bSwdenk
3800c609719bSwdenk	R0:	function argument word/integer result
3801c609719bSwdenk	R1-R3:	function argument word
3802c609719bSwdenk	R9:	GOT pointer
3803c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
3804c609719bSwdenk	R11:	argument (frame) pointer
3805c609719bSwdenk	R12:	temporary workspace
3806c609719bSwdenk	R13:	stack pointer
3807c609719bSwdenk	R14:	link register
3808c609719bSwdenk	R15:	program counter
3809c609719bSwdenk
3810c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
3811c609719bSwdenk
3812d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
3813d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
3814c609719bSwdenk
3815c609719bSwdenkMemory Management:
3816c609719bSwdenk------------------
3817c609719bSwdenk
3818c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
3819c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
3820c609719bSwdenk
3821c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
3822c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
3823c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
3824c609719bSwdenkphysical memory banks.
3825c609719bSwdenk
3826c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
3827c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
3828c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
3829c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
3830c609719bSwdenkmemory is reserved for use by malloc() [see CFG_MALLOC_LEN
3831c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
3832c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
3833c609719bSwdenk
3834c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
3835c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
3836c609719bSwdenk
3837c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
3838c609719bSwdenkthis:
3839c609719bSwdenk
3840c609719bSwdenk	0x0000 0000	Exception Vector code
3841c609719bSwdenk	      :
3842c609719bSwdenk	0x0000 1FFF
3843c609719bSwdenk	0x0000 2000	Free for Application Use
3844c609719bSwdenk	      :
3845c609719bSwdenk	      :
3846c609719bSwdenk
3847c609719bSwdenk	      :
3848c609719bSwdenk	      :
3849c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
3850c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
3851c609719bSwdenk	0x00FC 0000	Malloc Arena
3852c609719bSwdenk	      :
3853c609719bSwdenk	0x00FD FFFF
3854c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
3855c609719bSwdenk	...		eventually: LCD or video framebuffer
3856c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
3857c609719bSwdenk	0x00FF FFFF	[End of RAM]
3858c609719bSwdenk
3859c609719bSwdenk
3860c609719bSwdenkSystem Initialization:
3861c609719bSwdenk----------------------
3862c609719bSwdenk
3863c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
386411ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
3865c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
38667152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
3867c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
3868c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
3869c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
3870c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
3871c609719bSwdenkthe caches and the SIU.
3872c609719bSwdenk
3873c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
3874c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
3875c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3876c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3877c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
3878c609719bSwdenksimple memory test is run that determines the size of the SDRAM
3879c609719bSwdenkbanks.
3880c609719bSwdenk
3881c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
38827152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
3883c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
3884c609719bSwdenk0x00000000, with any additional banks following immediately to create
3885c609719bSwdenkcontiguous memory starting from 0.
3886c609719bSwdenk
3887c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
3888c609719bSwdenkand allocates memory for use by malloc() and for the global Board
3889c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
3890c609719bSwdenkpages, and the final stack is set up.
3891c609719bSwdenk
3892c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
3893c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
3894c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
3895c609719bSwdenknew address in RAM.
3896c609719bSwdenk
3897c609719bSwdenk
3898c609719bSwdenkU-Boot Porting Guide:
3899c609719bSwdenk----------------------
3900c609719bSwdenk
3901c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
39026aff3115Swdenklist, October 2002]
3903c609719bSwdenk
3904c609719bSwdenk
3905c609719bSwdenkint main (int argc, char *argv[])
3906c609719bSwdenk{
3907c609719bSwdenk	sighandler_t no_more_time;
3908c609719bSwdenk
3909c609719bSwdenk	signal (SIGALRM, no_more_time);
3910c609719bSwdenk	alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
3911c609719bSwdenk
3912c609719bSwdenk	if (available_money > available_manpower) {
3913c609719bSwdenk		pay consultant to port U-Boot;
3914c609719bSwdenk		return 0;
3915c609719bSwdenk	}
3916c609719bSwdenk
3917c609719bSwdenk	Download latest U-Boot source;
3918c609719bSwdenk
39196aff3115Swdenk	Subscribe to u-boot-users mailing list;
39206aff3115Swdenk
3921c609719bSwdenk	if (clueless) {
3922c609719bSwdenk		email ("Hi, I am new to U-Boot, how do I get started?");
3923c609719bSwdenk	}
3924c609719bSwdenk
3925c609719bSwdenk	while (learning) {
3926c609719bSwdenk		Read the README file in the top level directory;
39277cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual ;
3928c609719bSwdenk		Read the source, Luke;
3929c609719bSwdenk	}
3930c609719bSwdenk
3931c609719bSwdenk	if (available_money > toLocalCurrency ($2500)) {
3932c609719bSwdenk		Buy a BDI2000;
3933c609719bSwdenk	} else {
3934c609719bSwdenk		Add a lot of aggravation and time;
3935c609719bSwdenk	}
3936c609719bSwdenk
3937c609719bSwdenk	Create your own board support subdirectory;
3938c609719bSwdenk
39396aff3115Swdenk	Create your own board config file;
39406aff3115Swdenk
3941c609719bSwdenk	while (!running) {
3942c609719bSwdenk		do {
3943c609719bSwdenk			Add / modify source code;
3944c609719bSwdenk		} until (compiles);
3945c609719bSwdenk		Debug;
3946c609719bSwdenk		if (clueless)
3947c609719bSwdenk			email ("Hi, I am having problems...");
3948c609719bSwdenk	}
3949c609719bSwdenk	Send patch file to Wolfgang;
3950c609719bSwdenk
3951c609719bSwdenk	return 0;
3952c609719bSwdenk}
3953c609719bSwdenk
3954c609719bSwdenkvoid no_more_time (int sig)
3955c609719bSwdenk{
3956c609719bSwdenk      hire_a_guru();
3957c609719bSwdenk}
3958c609719bSwdenk
3959c609719bSwdenk
3960c609719bSwdenkCoding Standards:
3961c609719bSwdenk-----------------
3962c609719bSwdenk
3963c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
39642c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
39652c051651SDetlev Zundel"scripts/Lindent" in your Linux kernel source directory.  In sources
39662c051651SDetlev Zundeloriginating from U-Boot a style corresponding to "Lindent -pcs" (adding
39672c051651SDetlev Zundelspaces before parameters to function calls) is actually used.
3968c609719bSwdenk
39692c051651SDetlev ZundelSource files originating from a different project (for example the
39702c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
39712c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
39722c051651SDetlev Zundelsources.
39732c051651SDetlev Zundel
39742c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
39752c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
39762c051651SDetlev Zundelin your code.
3977c609719bSwdenk
3978c178d3daSwdenkPlease also stick to the following formatting rules:
3979180d3f74Swdenk- remove any trailing white space
3980180d3f74Swdenk- use TAB characters for indentation, not spaces
3981180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
3982180d3f74Swdenk- do not add more than 2 empty lines to source files
3983180d3f74Swdenk- do not add trailing empty lines to source files
3984180d3f74Swdenk
3985c609719bSwdenkSubmissions which do not conform to the standards may be returned
3986c609719bSwdenkwith a request to reformat the changes.
3987c609719bSwdenk
3988c609719bSwdenk
3989c609719bSwdenkSubmitting Patches:
3990c609719bSwdenk-------------------
3991c609719bSwdenk
3992c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
3993c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
3994c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
3995c609719bSwdenk
399690dc6704SwdenkPatches shall be sent to the u-boot-users mailing list.
3997c609719bSwdenk
39980d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
3999218ca724SWolfgang Denk
4000c609719bSwdenkWhen you send a patch, please include the following information with
4001c609719bSwdenkit:
4002c609719bSwdenk
4003c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
4004c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
4005c609719bSwdenk  patch actually fixes something.
4006c609719bSwdenk
4007c609719bSwdenk* For new features: a description of the feature and your
4008c609719bSwdenk  implementation.
4009c609719bSwdenk
4010c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
4011c609719bSwdenk
4012c609719bSwdenk* For major contributions, your entry to the CREDITS file
4013c609719bSwdenk
4014c609719bSwdenk* When you add support for a new board, don't forget to add this
4015c609719bSwdenk  board to the MAKEALL script, too.
4016c609719bSwdenk
4017c609719bSwdenk* If your patch adds new configuration options, don't forget to
4018c609719bSwdenk  document these in the README file.
4019c609719bSwdenk
4020218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
4021218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
4022218ca724SWolfgang Denk  "git-format-patch". If you then use "git-send-email" to send it to
4023218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
4024218ca724SWolfgang Denk  with some other mail clients.
4025c609719bSwdenk
4026218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
4027218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
4028218ca724SWolfgang Denk  GNU diff.
40296dff5529Swdenk
4030218ca724SWolfgang Denk  The current directory when running this command shall be the parent
4031218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
4032218ca724SWolfgang Denk  your patch includes sufficient directory information for the
4033218ca724SWolfgang Denk  affected files).
4034218ca724SWolfgang Denk
4035218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
4036218ca724SWolfgang Denk  and compressed attachments must not be used.
4037c609719bSwdenk
403852f52c14Swdenk* If one logical set of modifications affects or creates several
403952f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
404052f52c14Swdenk
404152f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
404252f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
404352f52c14Swdenk
404452f52c14Swdenk
4045c609719bSwdenkNotes:
4046c609719bSwdenk
4047c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
4048c609719bSwdenk  source tree and make sure that no errors or warnings are reported
4049c609719bSwdenk  for any of the boards.
4050c609719bSwdenk
4051c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
4052c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
4053c609719bSwdenk  returned with a request to re-formatting / split it.
4054c609719bSwdenk
4055c609719bSwdenk* If you modify existing code, make sure that your new code does not
4056c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
4057c609719bSwdenk  When adding new features, these should compile conditionally only
4058c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
4059c609719bSwdenk  disabled must not need more memory than the old code without your
4060c609719bSwdenk  modification.
406190dc6704Swdenk
406290dc6704Swdenk* Remember that there is a size limit of 40 kB per message on the
4063218ca724SWolfgang Denk  u-boot-users mailing list. Bigger patches will be moderated. If
4064218ca724SWolfgang Denk  they are reasonable and not bigger than 100 kB, they will be
4065218ca724SWolfgang Denk  acknowledged. Even bigger patches should be avoided.
4066