xref: /openbmc/u-boot/README (revision 9a042e9ca512beaaa2cb450274313fc477141241)
1c609719bSwdenk#
2151ab83aSwdenk# (C) Copyright 2000 - 2005
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
54c609719bSwdenkwho contributed the specific port.
55c609719bSwdenk
56c609719bSwdenk
57c609719bSwdenkWhere to get help:
58c609719bSwdenk==================
59c609719bSwdenk
60c609719bSwdenkIn case you have questions about, problems with or contributions for
61c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
62c609719bSwdenk<u-boot-users@lists.sourceforge.net>. There is also an archive of
63c609719bSwdenkprevious traffic on the mailing list - please search the archive
64c609719bSwdenkbefore asking FAQ's. Please see
65c609719bSwdenkhttp://lists.sourceforge.net/lists/listinfo/u-boot-users/
66c609719bSwdenk
67c609719bSwdenk
68c609719bSwdenkWhere we come from:
69c609719bSwdenk===================
70c609719bSwdenk
71c609719bSwdenk- start from 8xxrom sources
7224ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
73c609719bSwdenk- clean up code
74c609719bSwdenk- make it easier to add custom boards
75c609719bSwdenk- make it possible to add other [PowerPC] CPUs
76c609719bSwdenk- extend functions, especially:
77c609719bSwdenk  * Provide extended interface to Linux boot loader
78c609719bSwdenk  * S-Record download
79c609719bSwdenk  * network boot
80c609719bSwdenk  * PCMCIA / CompactFLash / ATA disk / SCSI ... boot
8124ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
82c609719bSwdenk- add other CPU families (starting with ARM)
8324ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
8424ee89b9Swdenk
8524ee89b9Swdenk
8624ee89b9SwdenkNames and Spelling:
8724ee89b9Swdenk===================
8824ee89b9Swdenk
8924ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
9024ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
9124ee89b9Swdenkin source files etc.). Example:
9224ee89b9Swdenk
9324ee89b9Swdenk	This is the README file for the U-Boot project.
9424ee89b9Swdenk
9524ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
9624ee89b9Swdenk
9724ee89b9Swdenk	include/asm-ppc/u-boot.h
9824ee89b9Swdenk
9924ee89b9Swdenk	#include <asm/u-boot.h>
10024ee89b9Swdenk
10124ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
10224ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
10324ee89b9Swdenk
10424ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
10524ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
106c609719bSwdenk
107c609719bSwdenk
10893f19cc0SwdenkVersioning:
10993f19cc0Swdenk===========
11093f19cc0Swdenk
11193f19cc0SwdenkU-Boot uses a 3 level version number containing a version, a
11293f19cc0Swdenksub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
11393f19cc0Swdenksub-version "34", and patchlevel "4".
11493f19cc0Swdenk
11593f19cc0SwdenkThe patchlevel is used to indicate certain stages of development
11693f19cc0Swdenkbetween released versions, i. e. officially released versions of
11793f19cc0SwdenkU-Boot will always have a patchlevel of "0".
11893f19cc0Swdenk
11993f19cc0Swdenk
120c609719bSwdenkDirectory Hierarchy:
121c609719bSwdenk====================
122c609719bSwdenk
1237152b1d0Swdenk- board		Board dependent files
1247152b1d0Swdenk- common	Misc architecture independent functions
125c609719bSwdenk- cpu		CPU specific files
126983fda83Swdenk  - 74xx_7xx	Files specific to Freescale MPC74xx and 7xx CPUs
12711dadd54Swdenk  - arm720t	Files specific to ARM 720 CPUs
12811dadd54Swdenk  - arm920t	Files specific to ARM 920 CPUs
129a85f9f21Swdenk    - at91rm9200 Files specific to Atmel AT91RM9200 CPU
130983fda83Swdenk    - imx	Files specific to Freescale MC9328 i.MX CPUs
1311d9f4105Swdenk    - s3c24x0	Files specific to Samsung S3C24X0 CPUs
13211dadd54Swdenk  - arm925t	Files specific to ARM 925 CPUs
13311dadd54Swdenk  - arm926ejs	Files specific to ARM 926 CPUs
1348ed96046Swdenk  - arm1136	Files specific to ARM 1136 CPUs
13572a087e0SWolfgang Denk  - at32ap	Files specific to Atmel AVR32 AP CPUs
13611dadd54Swdenk  - i386	Files specific to i386 CPUs
13711dadd54Swdenk  - ixp		Files specific to Intel XScale IXP CPUs
138983fda83Swdenk  - mcf52x2	Files specific to Freescale ColdFire MCF52x2 CPUs
1391552af70STsiChungLiew  - mcf5227x	Files specific to Freescale ColdFire MCF5227x CPUs
1408e585f02STsiChung Liew  - mcf532x	Files specific to Freescale ColdFire MCF5329 CPUs
1418ae158cdSTsiChungLiew  - mcf5445x	Files specific to Freescale ColdFire MCF5445x CPUs
14257a12720STsiChungLiew  - mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
14311dadd54Swdenk  - mips	Files specific to MIPS CPUs
144983fda83Swdenk  - mpc5xx	Files specific to Freescale MPC5xx  CPUs
145983fda83Swdenk  - mpc5xxx	Files specific to Freescale MPC5xxx CPUs
146983fda83Swdenk  - mpc8xx	Files specific to Freescale MPC8xx  CPUs
147983fda83Swdenk  - mpc8220	Files specific to Freescale MPC8220 CPUs
148983fda83Swdenk  - mpc824x	Files specific to Freescale MPC824x CPUs
149983fda83Swdenk  - mpc8260	Files specific to Freescale MPC8260 CPUs
150983fda83Swdenk  - mpc85xx	Files specific to Freescale MPC85xx CPUs
15111dadd54Swdenk  - nios	Files specific to Altera NIOS CPUs
1525c952cf0Swdenk  - nios2	Files specific to Altera Nios-II CPUs
1530c8721a4SWolfgang Denk  - ppc4xx	Files specific to AMCC PowerPC 4xx CPUs
15411dadd54Swdenk  - pxa		Files specific to Intel XScale PXA CPUs
15511dadd54Swdenk  - s3c44b0	Files specific to Samsung S3C44B0 CPUs
15611dadd54Swdenk  - sa1100	Files specific to Intel StrongARM SA1100 CPUs
157c609719bSwdenk- disk		Code for disk drive partition handling
158c609719bSwdenk- doc		Documentation (don't expect too much)
1597152b1d0Swdenk- drivers	Commonly used device drivers
160c609719bSwdenk- dtt		Digital Thermometer and Thermostat drivers
161c609719bSwdenk- examples	Example code for standalone applications, etc.
162c609719bSwdenk- include	Header Files
16311dadd54Swdenk- lib_arm	Files generic to ARM	 architecture
1647b64fef3SWolfgang Denk- lib_avr32	Files generic to AVR32	 architecture
16511dadd54Swdenk- lib_generic	Files generic to all	 architectures
16611dadd54Swdenk- lib_i386	Files generic to i386	 architecture
16711dadd54Swdenk- lib_m68k	Files generic to m68k	 architecture
16811dadd54Swdenk- lib_mips	Files generic to MIPS	 architecture
16911dadd54Swdenk- lib_nios	Files generic to NIOS	 architecture
17011dadd54Swdenk- lib_ppc	Files generic to PowerPC architecture
171213bf8c8SGerald Van Baren- libfdt 	Library files to support flattened device trees
172c609719bSwdenk- net		Networking code
173c609719bSwdenk- post		Power On Self Test
174c609719bSwdenk- rtc		Real Time Clock drivers
175c609719bSwdenk- tools		Tools to build S-Record or U-Boot images, etc.
176c609719bSwdenk
177c609719bSwdenkSoftware Configuration:
178c609719bSwdenk=======================
179c609719bSwdenk
180c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
181c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
182c609719bSwdenk
183c609719bSwdenkThere are two classes of configuration variables:
184c609719bSwdenk
185c609719bSwdenk* Configuration _OPTIONS_:
186c609719bSwdenk  These are selectable by the user and have names beginning with
187c609719bSwdenk  "CONFIG_".
188c609719bSwdenk
189c609719bSwdenk* Configuration _SETTINGS_:
190c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
191c609719bSwdenk  you don't know what you're doing; they have names beginning with
192c609719bSwdenk  "CFG_".
193c609719bSwdenk
194c609719bSwdenkLater we will add a configuration tool - probably similar to or even
195c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
196c609719bSwdenkdo the configuration by hand, which means creating some symbolic
197c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
198c609719bSwdenkas an example here.
199c609719bSwdenk
200c609719bSwdenk
201c609719bSwdenkSelection of Processor Architecture and Board Type:
202c609719bSwdenk---------------------------------------------------
203c609719bSwdenk
204c609719bSwdenkFor all supported boards there are ready-to-use default
205c609719bSwdenkconfigurations available; just type "make <board_name>_config".
206c609719bSwdenk
207c609719bSwdenkExample: For a TQM823L module type:
208c609719bSwdenk
209c609719bSwdenk	cd u-boot
210c609719bSwdenk	make TQM823L_config
211c609719bSwdenk
212c609719bSwdenkFor the Cogent platform, you need to specify the cpu type as well;
213c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
214c609719bSwdenkdirectory according to the instructions in cogent/README.
215c609719bSwdenk
216c609719bSwdenk
217c609719bSwdenkConfiguration Options:
218c609719bSwdenk----------------------
219c609719bSwdenk
220c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
221c609719bSwdenksuch information is kept in a configuration file
222c609719bSwdenk"include/configs/<board_name>.h".
223c609719bSwdenk
224c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
225c609719bSwdenk"include/configs/TQM823L.h".
226c609719bSwdenk
227c609719bSwdenk
2287f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2297f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2307f6c2cbcSwdenkbuild a config tool - later.
2317f6c2cbcSwdenk
2327f6c2cbcSwdenk
233c609719bSwdenkThe following options need to be configured:
234c609719bSwdenk
2352628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
236c609719bSwdenk
2372628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2386ccec449SWolfgang Denk
2396ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
24009ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
241c609719bSwdenk
242c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
243c609719bSwdenk		Define exactly one of
244c609719bSwdenk		CONFIG_CMA286_60_OLD
245c609719bSwdenk--- FIXME --- not tested yet:
246c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
247c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
248c609719bSwdenk
249c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
250c609719bSwdenk		Define exactly one of
251c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
252c609719bSwdenk
253c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
254c609719bSwdenk		Define one or more of
255c609719bSwdenk		CONFIG_CMA302
256c609719bSwdenk
257c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
258c609719bSwdenk		Define one or more of
259c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
260c609719bSwdenk					  the lcd display every second with
261c609719bSwdenk					  a "rotator" |\-/|\-/
262c609719bSwdenk
2632535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
2642535d602Swdenk		CONFIG_ADSTYPE
2652535d602Swdenk		Possible values are:
2662535d602Swdenk			CFG_8260ADS	- original MPC8260ADS
267180d3f74Swdenk			CFG_8266ADS	- MPC8266ADS
26854387ac9Swdenk			CFG_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
26904a85b3bSwdenk			CFG_8272ADS	- MPC8272ADS
2702535d602Swdenk
271c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
272c609719bSwdenk		Define exactly one of
273c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
274c609719bSwdenk
27575d1ea7fSwdenk- 8xx CPU Options: (if using an MPC8xx cpu)
27666ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
27766ca92a5Swdenk					  get_gclk_freq() cannot work
2785da627a4Swdenk					  e.g. if there is no 32KHz
2795da627a4Swdenk					  reference PIT/RTC clock
28066ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
28166ca92a5Swdenk					  or XTAL/EXTAL)
282c609719bSwdenk
28366ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
28466ca92a5Swdenk		CFG_8xx_CPUCLK_MIN
28566ca92a5Swdenk		CFG_8xx_CPUCLK_MAX
28666ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
28775d1ea7fSwdenk			See doc/README.MPC866
28875d1ea7fSwdenk
28975d1ea7fSwdenk		CFG_MEASURE_CPUCLK
29075d1ea7fSwdenk
29175d1ea7fSwdenk		Define this to measure the actual CPU clock instead
29275d1ea7fSwdenk		of relying on the correctness of the configured
29375d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
29475d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
29575d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
29666ca92a5Swdenk		RTC clock or CFG_8XX_XIN)
29775d1ea7fSwdenk
2980b953ffcSMarkus Klotzbuecher- Intel Monahans options:
2990b953ffcSMarkus Klotzbuecher		CFG_MONAHANS_RUN_MODE_OSC_RATIO
3000b953ffcSMarkus Klotzbuecher
3010b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
3020b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
3030b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
3040b953ffcSMarkus Klotzbuecher
3050b953ffcSMarkus Klotzbuecher		CFG_MONAHANS_TURBO_RUN_MODE_RATIO
3060b953ffcSMarkus Klotzbuecher
3070b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
3080b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
3090b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
3100b953ffcSMarkus Klotzbuecher		by this value.
3110b953ffcSMarkus Klotzbuecher
3125da627a4Swdenk- Linux Kernel Interface:
313c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
314c609719bSwdenk
315c609719bSwdenk		U-Boot stores all clock information in Hz
316c609719bSwdenk		internally. For binary compatibility with older Linux
317c609719bSwdenk		kernels (which expect the clocks passed in the
318c609719bSwdenk		bd_info data to be in MHz) the environment variable
319c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
320c609719bSwdenk		converts clock data to MHZ before passing it to the
321c609719bSwdenk		Linux kernel.
322c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
323c609719bSwdenk		"clocks_in_mhz=1" is  automatically  included  in  the
324c609719bSwdenk		default environment.
325c609719bSwdenk
3265da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
3275da627a4Swdenk
3285da627a4Swdenk		When transfering memsize parameter to linux, some versions
3295da627a4Swdenk		expect it to be in bytes, others in MB.
3305da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
3315da627a4Swdenk
332213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT / CONFIG_OF_FLAT_TREE
333f57f70aaSWolfgang Denk
334f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
335213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
336213bf8c8SGerald Van Baren		concepts).
337213bf8c8SGerald Van Baren
338213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
339213bf8c8SGerald Van Baren		 * New libfdt-based support
340213bf8c8SGerald Van Baren		 * Adds the "fdt" command
3413bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
342213bf8c8SGerald Van Baren
343213bf8c8SGerald Van Baren		CONFIG_OF_FLAT_TREE
344213bf8c8SGerald Van Baren		 * Deprecated, see CONFIG_OF_LIBFDT
345213bf8c8SGerald Van Baren		 * Original ft_build.c-based support
346213bf8c8SGerald Van Baren		 * Automatically modifies the dft as part of the bootm command
347213bf8c8SGerald Van Baren		 * The environment variable "disable_of", when set,
348213bf8c8SGerald Van Baren		     disables this functionality.
349f57f70aaSWolfgang Denk
350f57f70aaSWolfgang Denk		OF_CPU - The proper name of the cpus node.
351c2871f03SKumar Gala		OF_SOC - The proper name of the soc node.
352f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
353c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
354f57f70aaSWolfgang Denk
3553bb342fcSKim Phillips		boards with QUICC Engines require OF_QE to set UCC mac addresses
3563bb342fcSKim Phillips
357e4f880edSKumar Gala		CONFIG_OF_HAS_BD_T
358e4f880edSKumar Gala
359213bf8c8SGerald Van Baren		 * CONFIG_OF_LIBFDT - enables the "fdt bd_t" command
360213bf8c8SGerald Van Baren		 * CONFIG_OF_FLAT_TREE - The resulting flat device tree
361213bf8c8SGerald Van Baren		     will have a copy of the bd_t.  Space should be
362213bf8c8SGerald Van Baren		     pre-allocated in the dts for the bd_t.
363e4f880edSKumar Gala
364e4f880edSKumar Gala		CONFIG_OF_HAS_UBOOT_ENV
365e4f880edSKumar Gala
3663bb342fcSKim Phillips		 * CONFIG_OF_LIBFDT - enables the "fdt env" command
367213bf8c8SGerald Van Baren		 * CONFIG_OF_FLAT_TREE - The resulting flat device tree
368213bf8c8SGerald Van Baren		     will have a copy of u-boot's environment variables
369e4f880edSKumar Gala
3704e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
3714e253137SKumar Gala
3724e253137SKumar Gala		Board code has addition modification that it wants to make
3734e253137SKumar Gala		to the flat device tree before handing it off to the kernel
3746705d81eSwdenk
3750267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
3760267768eSMatthew McClintock
3770267768eSMatthew McClintock		This define fills in the correct boot cpu in the boot
3780267768eSMatthew McClintock		param header, the default value is zero if undefined.
3790267768eSMatthew McClintock
3806705d81eSwdenk- Serial Ports:
3816705d81eSwdenk		CFG_PL010_SERIAL
3826705d81eSwdenk
3836705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
3846705d81eSwdenk
3856705d81eSwdenk		CFG_PL011_SERIAL
3866705d81eSwdenk
3876705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
3886705d81eSwdenk
3896705d81eSwdenk		CONFIG_PL011_CLOCK
3906705d81eSwdenk
3916705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
3926705d81eSwdenk		the clock speed of the UARTs.
3936705d81eSwdenk
3946705d81eSwdenk		CONFIG_PL01x_PORTS
3956705d81eSwdenk
3966705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
3976705d81eSwdenk		define this to a list of base addresses for each (supported)
3986705d81eSwdenk		port. See e.g. include/configs/versatile.h
3996705d81eSwdenk
4006705d81eSwdenk
401c609719bSwdenk- Console Interface:
402c609719bSwdenk		Depending on board, define exactly one serial port
403c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
404c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
405c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
406c609719bSwdenk
407c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
408c609719bSwdenk		port routines must be defined elsewhere
409c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
410c609719bSwdenk
411c609719bSwdenk		CONFIG_CFB_CONSOLE
412c609719bSwdenk		Enables console device for a color framebuffer. Needs following
413c609719bSwdenk		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
414c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
415c609719bSwdenk						(default big endian)
416c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
417c609719bSwdenk						rectangle fill
418c609719bSwdenk						(cf. smiLynxEM)
419c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
420c609719bSwdenk						bit-blit (cf. smiLynxEM)
421c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
422c609719bSwdenk						(cols=pitch)
423c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
424c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
425c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
426c609719bSwdenk						(0-5, cf. cfb_console.c)
427c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
428c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
429c609719bSwdenk						(i.e. i8042_kbd_init())
430c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
431c609719bSwdenk						(i.e. i8042_tstc)
432c609719bSwdenk			VIDEO_GETC_FCT		get char fct
433c609719bSwdenk						(i.e. i8042_getc)
434c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
435c609719bSwdenk						(requires blink timer
436c609719bSwdenk						cf. i8042.c)
437c609719bSwdenk			CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
438c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
439c609719bSwdenk						upper right corner
440602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
441c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
442c609719bSwdenk						upper left corner
443a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
444a6c7ad2fSwdenk						linux_logo.h for logo.
445a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
446c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
447c609719bSwdenk						addional board info beside
448c609719bSwdenk						the logo
449c609719bSwdenk
450c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
451c609719bSwdenk		default i/o. Serial console can be forced with
452c609719bSwdenk		environment 'console=serial'.
453c609719bSwdenk
454a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
455a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
456a3ad8e26Swdenk		the "silent" environment variable. See
457a3ad8e26Swdenk		doc/README.silent for more information.
458a3ad8e26Swdenk
459c609719bSwdenk- Console Baudrate:
460c609719bSwdenk		CONFIG_BAUDRATE - in bps
461c609719bSwdenk		Select one of the baudrates listed in
462c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
4633bbc899fSwdenk		CFG_BRGCLK_PRESCALE, baudrate prescale
464c609719bSwdenk
465c609719bSwdenk- Interrupt driven serial port input:
466c609719bSwdenk		CONFIG_SERIAL_SOFTWARE_FIFO
467c609719bSwdenk
468c609719bSwdenk		PPC405GP only.
469c609719bSwdenk		Use an interrupt handler for receiving data on the
470c609719bSwdenk		serial port. It also enables using hardware handshake
471c609719bSwdenk		(RTS/CTS) and UART's built-in FIFO. Set the number of
472c609719bSwdenk		bytes the interrupt driven input buffer should have.
473c609719bSwdenk
474109c0e3aSwdenk		Leave undefined to disable this feature, including
475109c0e3aSwdenk		disable the buffer and hardware handshake.
476c609719bSwdenk
4771d49b1f3Sstroese- Console UART Number:
4781d49b1f3Sstroese		CONFIG_UART1_CONSOLE
4791d49b1f3Sstroese
4800c8721a4SWolfgang Denk		AMCC PPC4xx only.
4811d49b1f3Sstroese		If defined internal UART1 (and not UART0) is used
4821d49b1f3Sstroese		as default U-Boot console.
4831d49b1f3Sstroese
484c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
485c609719bSwdenk		Delay before automatically booting the default image;
486c609719bSwdenk		set to -1 to disable autoboot.
487c609719bSwdenk
488c609719bSwdenk		See doc/README.autoboot for these options that
489c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
490c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
491c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
492c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
493c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
494c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
495c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
496c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
497c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
498c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
499c609719bSwdenk		CONFIG_RESET_TO_RETRY
500c609719bSwdenk
501c609719bSwdenk- Autoboot Command:
502c609719bSwdenk		CONFIG_BOOTCOMMAND
503c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
504c609719bSwdenk		define a command string that is automatically executed
505c609719bSwdenk		when no character is read on the console interface
506c609719bSwdenk		within "Boot Delay" after reset.
507c609719bSwdenk
508c609719bSwdenk		CONFIG_BOOTARGS
509c609719bSwdenk		This can be used to pass arguments to the bootm
510c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
511c609719bSwdenk		environment value "bootargs".
512c609719bSwdenk
513c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
514c609719bSwdenk		The value of these goes into the environment as
515c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
516c609719bSwdenk		as a convenience, when switching between booting from
517c609719bSwdenk		ram and nfs.
518c609719bSwdenk
519c609719bSwdenk- Pre-Boot Commands:
520c609719bSwdenk		CONFIG_PREBOOT
521c609719bSwdenk
522c609719bSwdenk		When this option is #defined, the existence of the
523c609719bSwdenk		environment variable "preboot" will be checked
524c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
525c609719bSwdenk		countdown and/or running the auto-boot command resp.
526c609719bSwdenk		entering interactive mode.
527c609719bSwdenk
528c609719bSwdenk		This feature is especially useful when "preboot" is
529c609719bSwdenk		automatically generated or modified. For an example
530c609719bSwdenk		see the LWMON board specific code: here "preboot" is
531c609719bSwdenk		modified when the user holds down a certain
532c609719bSwdenk		combination of keys on the (special) keyboard when
533c609719bSwdenk		booting the systems
534c609719bSwdenk
535c609719bSwdenk- Serial Download Echo Mode:
536c609719bSwdenk		CONFIG_LOADS_ECHO
537c609719bSwdenk		If defined to 1, all characters received during a
538c609719bSwdenk		serial download (using the "loads" command) are
539c609719bSwdenk		echoed back. This might be needed by some terminal
540c609719bSwdenk		emulations (like "cu"), but may as well just take
541c609719bSwdenk		time on others. This setting #define's the initial
542c609719bSwdenk		value of the "loads_echo" environment variable.
543c609719bSwdenk
544602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
545c609719bSwdenk		CONFIG_KGDB_BAUDRATE
546c609719bSwdenk		Select one of the baudrates listed in
547c609719bSwdenk		CFG_BAUDRATE_TABLE, see below.
548c609719bSwdenk
549c609719bSwdenk- Monitor Functions:
550602ad3b3SJon Loeliger		Monitor commands can be included or excluded
551602ad3b3SJon Loeliger		from the build by using the #include files
552602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
553602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
554602ad3b3SJon Loeliger		and augmenting with additional #define's
555602ad3b3SJon Loeliger		for wanted commands.
556c609719bSwdenk
557602ad3b3SJon Loeliger		The default command configuration includes all commands
558602ad3b3SJon Loeliger		except those marked below with a "*".
559602ad3b3SJon Loeliger
560602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
561602ad3b3SJon Loeliger		CONFIG_CMD_AUTOSCRIPT	  Autoscript Support
562602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
563602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
564602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
565602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
566602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
567602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
568602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
569602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
570602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
571602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
572602ad3b3SJon Loeliger		CONFIG_CMD_DOC		* Disk-On-Chip Support
573602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
574602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
575602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
576602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
577602ad3b3SJon Loeliger		CONFIG_CMD_ENV		  saveenv
578602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
579602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
580602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
581602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
582602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
583602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
584602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
585602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
586602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
587602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
588602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
589602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
590602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
591602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
592602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
593602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
594602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
595602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
59656523f12Swdenk					  loop, loopw, mtest
597602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
598602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
599602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
600602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
601602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
602602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
603602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
604602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
605602ad3b3SJon Loeliger					  host
606602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
607602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
608602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
609602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
610602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
611602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
612602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
613602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
614602ad3b3SJon Loeliger					  (4xx only)
615602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
616602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
617602ad3b3SJon Loeliger		CONFIG_CMD_VFD		* VFD support (TRAB)
618602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board SPecific functions
619602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
620602ad3b3SJon Loeliger		CONFIG_CMD_FSL		* Microblaze FSL support
621c609719bSwdenk
622c609719bSwdenk
623c609719bSwdenk		EXAMPLE: If you want all functions except of network
624c609719bSwdenk		support you can write:
625c609719bSwdenk
626602ad3b3SJon Loeliger		#include "config_cmd_all.h"
627602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
628c609719bSwdenk
629213bf8c8SGerald Van Baren	Other Commands:
630213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
631c609719bSwdenk
632c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
633602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
634c609719bSwdenk		what you (and your U-Boot users) are doing. Data
635c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
636c609719bSwdenk		8260 (where accesses to the IMMR region must be
637c609719bSwdenk		uncached), and it cannot be disabled on all other
638c609719bSwdenk		systems where we (mis-) use the data cache to hold an
639c609719bSwdenk		initial stack and some data.
640c609719bSwdenk
641c609719bSwdenk
642c609719bSwdenk		XXX - this list needs to get updated!
643c609719bSwdenk
644c609719bSwdenk- Watchdog:
645c609719bSwdenk		CONFIG_WATCHDOG
646c609719bSwdenk		If this variable is defined, it enables watchdog
6477152b1d0Swdenk		support. There must be support in the platform specific
648c609719bSwdenk		code for a watchdog. For the 8xx and 8260 CPUs, the
649c609719bSwdenk		SIU Watchdog feature is enabled in the SYPCR
650c609719bSwdenk		register.
651c609719bSwdenk
652c1551ea8Sstroese- U-Boot Version:
653c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
654c1551ea8Sstroese		If this variable is defined, an environment variable
655c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
656c1551ea8Sstroese		version as printed by the "version" command.
657c1551ea8Sstroese		This variable is readonly.
658c1551ea8Sstroese
659c609719bSwdenk- Real-Time Clock:
660c609719bSwdenk
661602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
662c609719bSwdenk		has to be selected, too. Define exactly one of the
663c609719bSwdenk		following options:
664c609719bSwdenk
665c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
666c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
667c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
6681cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
669c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
6707f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
6713bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
6729536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
6734c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
674c609719bSwdenk
675b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
676b37c7e5eSwdenk		must also be configured. See I2C Support, below.
677b37c7e5eSwdenk
678c609719bSwdenk- Timestamp Support:
679c609719bSwdenk
680c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
681c609719bSwdenk		(date and time) of an image is printed by image
682c609719bSwdenk		commands like bootm or iminfo. This option is
683602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
684c609719bSwdenk
685c609719bSwdenk- Partition Support:
686c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
687c609719bSwdenk		and/or CONFIG_ISO_PARTITION
688c609719bSwdenk
689602ad3b3SJon Loeliger		If IDE or SCSI support	is  enabled  (CONFIG_CMD_IDE or
690602ad3b3SJon Loeliger		CONFIG_CMD_SCSI) you must configure support for at least
691c609719bSwdenk		one partition type as well.
692c609719bSwdenk
693c609719bSwdenk- IDE Reset method:
6944d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
6954d13cbadSwdenk		board configurations files but used nowhere!
696c609719bSwdenk
6974d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
6984d13cbadSwdenk		be performed by calling the function
6994d13cbadSwdenk			ide_set_reset(int reset)
7004d13cbadSwdenk		which has to be defined in a board specific file
701c609719bSwdenk
702c609719bSwdenk- ATAPI Support:
703c609719bSwdenk		CONFIG_ATAPI
704c609719bSwdenk
705c609719bSwdenk		Set this to enable ATAPI support.
706c609719bSwdenk
707c40b2956Swdenk- LBA48 Support
708c40b2956Swdenk		CONFIG_LBA48
709c40b2956Swdenk
710c40b2956Swdenk		Set this to enable support for disks larger than 137GB
711c40b2956Swdenk		Also look at CFG_64BIT_LBA ,CFG_64BIT_VSPRINTF and CFG_64BIT_STRTOUL
712c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
713c40b2956Swdenk		support disks up to 2.1TB.
714c40b2956Swdenk
715c40b2956Swdenk		CFG_64BIT_LBA:
716c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
717c40b2956Swdenk			Default is 32bit.
718c40b2956Swdenk
719c609719bSwdenk- SCSI Support:
720c609719bSwdenk		At the moment only there is only support for the
721c609719bSwdenk		SYM53C8XX SCSI controller; define
722c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
723c609719bSwdenk
724c609719bSwdenk		CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
725c609719bSwdenk		CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
726c609719bSwdenk		CFG_SCSI_MAX_LUN] can be adjusted to define the
727c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
728c609719bSwdenk		devices.
729c609719bSwdenk		CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
730c609719bSwdenk
731c609719bSwdenk- NETWORK Support (PCI):
732682011ffSwdenk		CONFIG_E1000
733682011ffSwdenk		Support for Intel 8254x gigabit chips.
734682011ffSwdenk
735c609719bSwdenk		CONFIG_EEPRO100
736c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
737c609719bSwdenk		Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
738c609719bSwdenk		write routine for first time initialisation.
739c609719bSwdenk
740c609719bSwdenk		CONFIG_TULIP
741c609719bSwdenk		Support for Digital 2114x chips.
742c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
743c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
744c609719bSwdenk
745c609719bSwdenk		CONFIG_NATSEMI
746c609719bSwdenk		Support for National dp83815 chips.
747c609719bSwdenk
748c609719bSwdenk		CONFIG_NS8382X
749c609719bSwdenk		Support for National dp8382[01] gigabit chips.
750c609719bSwdenk
75145219c46Swdenk- NETWORK Support (other):
75245219c46Swdenk
75345219c46Swdenk		CONFIG_DRIVER_LAN91C96
75445219c46Swdenk		Support for SMSC's LAN91C96 chips.
75545219c46Swdenk
75645219c46Swdenk			CONFIG_LAN91C96_BASE
75745219c46Swdenk			Define this to hold the physical address
75845219c46Swdenk			of the LAN91C96's I/O space
75945219c46Swdenk
76045219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
76145219c46Swdenk			Define this to enable 32 bit addressing
76245219c46Swdenk
763f39748aeSwdenk		CONFIG_DRIVER_SMC91111
764f39748aeSwdenk		Support for SMSC's LAN91C111 chip
765f39748aeSwdenk
766f39748aeSwdenk			CONFIG_SMC91111_BASE
767f39748aeSwdenk			Define this to hold the physical address
768f39748aeSwdenk			of the device (I/O space)
769f39748aeSwdenk
770f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
771f39748aeSwdenk			Define this if data bus is 32 bits
772f39748aeSwdenk
773f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
774f39748aeSwdenk			Define this to use i/o functions instead of macros
775f39748aeSwdenk			(some hardware wont work with macros)
776f39748aeSwdenk
777c609719bSwdenk- USB Support:
778c609719bSwdenk		At the moment only the UHCI host controller is
7794d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
780c609719bSwdenk		CONFIG_USB_UHCI to enable it.
781c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
78230d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
783c609719bSwdenk		storage devices.
784c609719bSwdenk		Note:
785c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
786c609719bSwdenk		(TEAC FD-05PUB).
7874d13cbadSwdenk		MPC5200 USB requires additional defines:
7884d13cbadSwdenk			CONFIG_USB_CLOCK
7894d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
7904d13cbadSwdenk			CONFIG_USB_CONFIG
7914d13cbadSwdenk				for differential drivers: 0x00001000
7924d13cbadSwdenk				for single ended drivers: 0x00005000
793fdcfaa1bSZhang Wei			CFG_USB_EVENT_POLL
794fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
795fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
7964d13cbadSwdenk
79716c8d5e7SWolfgang Denk- USB Device:
79816c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
79916c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
80016c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
80116c8d5e7SWolfgang Denk		attach your usb cable. The Unix command "dmesg" should print
80216c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
80316c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
80416c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
80516c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
80616c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
80716c8d5e7SWolfgang Denk		a Linux host by
80816c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
80916c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
81016c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
81116c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
81216c8d5e7SWolfgang Denk
81316c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
81416c8d5e7SWolfgang Denk			Define this to build a UDC device
81516c8d5e7SWolfgang Denk
81616c8d5e7SWolfgang Denk			CONFIG_USB_TTY
81716c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
81816c8d5e7SWolfgang Denk			talk to the UDC device
81916c8d5e7SWolfgang Denk
82016c8d5e7SWolfgang Denk			CFG_CONSOLE_IS_IN_ENV
82116c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
82216c8d5e7SWolfgang Denk			be set to usbtty.
82316c8d5e7SWolfgang Denk
82416c8d5e7SWolfgang Denk			mpc8xx:
82516c8d5e7SWolfgang Denk				CFG_USB_EXTC_CLK 0xBLAH
82616c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
82716c8d5e7SWolfgang Denk				- CFG_USB_EXTC_CLK 0x02
82816c8d5e7SWolfgang Denk
82916c8d5e7SWolfgang Denk				CFG_USB_BRG_CLK 0xBLAH
83016c8d5e7SWolfgang Denk				Derive USB clock from brgclk
83116c8d5e7SWolfgang Denk				- CFG_USB_BRG_CLK 0x04
83216c8d5e7SWolfgang Denk
83316c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
83416c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
83516c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
83616c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
83716c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
83816c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
83916c8d5e7SWolfgang Denk
84016c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
84116c8d5e7SWolfgang Denk			Define this string as the name of your company for
84216c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
84316c8d5e7SWolfgang Denk
84416c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
84516c8d5e7SWolfgang Denk			Define this string as the name of your product
84616c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
84716c8d5e7SWolfgang Denk
84816c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
84916c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
85016c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
85116c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
85216c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
85316c8d5e7SWolfgang Denk
85416c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
85516c8d5e7SWolfgang Denk			Define this as the unique Product ID
85616c8d5e7SWolfgang Denk			for your device
85716c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
858c609719bSwdenk
859c609719bSwdenk
860c609719bSwdenk- MMC Support:
861c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
862c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
863c609719bSwdenk		accessed from the boot prompt by mapping the device
864c609719bSwdenk		to physical memory similar to flash. Command line is
865602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
866602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
867c609719bSwdenk
8686705d81eSwdenk- Journaling Flash filesystem support:
8696705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
8706705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
8716705d81eSwdenk		Define these for a default partition on a NAND device
8726705d81eSwdenk
8736705d81eSwdenk		CFG_JFFS2_FIRST_SECTOR,
8746705d81eSwdenk		CFG_JFFS2_FIRST_BANK, CFG_JFFS2_NUM_BANKS
8756705d81eSwdenk		Define these for a default partition on a NOR device
8766705d81eSwdenk
8776705d81eSwdenk		CFG_JFFS_CUSTOM_PART
8786705d81eSwdenk		Define this to create an own partition. You have to provide a
8796705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
8806705d81eSwdenk
8816705d81eSwdenk		If you define only one JFFS2 partition you may also want to
8826705d81eSwdenk		#define CFG_JFFS_SINGLE_PART	1
8836705d81eSwdenk		to disable the command chpart. This is the default when you
8846705d81eSwdenk		have not defined a custom partition
8856705d81eSwdenk
886c609719bSwdenk- Keyboard Support:
887c609719bSwdenk		CONFIG_ISA_KEYBOARD
888c609719bSwdenk
889c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
890c609719bSwdenk		support
891c609719bSwdenk
892c609719bSwdenk		CONFIG_I8042_KBD
893c609719bSwdenk		Standard PC keyboard driver with US (is default) and
894c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
895c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
896c609719bSwdenk		for cfb_console. Supports cursor blinking.
897c609719bSwdenk
898c609719bSwdenk- Video support:
899c609719bSwdenk		CONFIG_VIDEO
900c609719bSwdenk
901c609719bSwdenk		Define this to enable video support (for output to
902c609719bSwdenk		video).
903c609719bSwdenk
904c609719bSwdenk		CONFIG_VIDEO_CT69000
905c609719bSwdenk
906c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
907c609719bSwdenk
908c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
909eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
910eeb1b77bSwdenk		video output is selected via environment 'videoout'
911eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
912eeb1b77bSwdenk		assumed.
913c609719bSwdenk
914eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
915eeb1b77bSwdenk		selected via environment 'videomode'. Two diferent ways
916eeb1b77bSwdenk		are possible:
917eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
918eeb1b77bSwdenk		Following standard modes are supported	(* is default):
919eeb1b77bSwdenk
920eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
921eeb1b77bSwdenk		-------------+---------------------------------------------
922eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
923eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
924eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
925eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
926eeb1b77bSwdenk		-------------+---------------------------------------------
927c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
928c609719bSwdenk
929eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
9307817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
931eeb1b77bSwdenk
932eeb1b77bSwdenk
933a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
934a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
935a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
936a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
937a6c7ad2fSwdenk
938682011ffSwdenk- Keyboard Support:
939682011ffSwdenk		CONFIG_KEYBOARD
940682011ffSwdenk
941682011ffSwdenk		Define this to enable a custom keyboard support.
942682011ffSwdenk		This simply calls drv_keyboard_init() which must be
943682011ffSwdenk		defined in your board-specific files.
944682011ffSwdenk		The only board using this so far is RBC823.
945a6c7ad2fSwdenk
946c609719bSwdenk- LCD Support:	CONFIG_LCD
947c609719bSwdenk
948c609719bSwdenk		Define this to enable LCD support (for output to LCD
949c609719bSwdenk		display); also select one of the supported displays
950c609719bSwdenk		by defining one of these:
951c609719bSwdenk
952fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
953c609719bSwdenk
954fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
955c609719bSwdenk
956fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
957c609719bSwdenk
958fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
959fd3103bbSwdenk			Active, color, single scan.
960fd3103bbSwdenk
961fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
962fd3103bbSwdenk
963fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
964c609719bSwdenk			Active, color, single scan.
965c609719bSwdenk
966c609719bSwdenk		CONFIG_SHARP_16x9
967c609719bSwdenk
968c609719bSwdenk			Sharp 320x240. Active, color, single scan.
969c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
970c609719bSwdenk
971c609719bSwdenk		CONFIG_SHARP_LQ64D341
972c609719bSwdenk
973c609719bSwdenk			Sharp LQ64D341 display, 640x480.
974c609719bSwdenk			Active, color, single scan.
975c609719bSwdenk
976c609719bSwdenk		CONFIG_HLD1045
977c609719bSwdenk
978c609719bSwdenk			HLD1045 display, 640x480.
979c609719bSwdenk			Active, color, single scan.
980c609719bSwdenk
981c609719bSwdenk		CONFIG_OPTREX_BW
982c609719bSwdenk
983c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
984c609719bSwdenk			or
985c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
986c609719bSwdenk			or
987c609719bSwdenk			Hitachi	 SP14Q002
988c609719bSwdenk
989c609719bSwdenk			320x240. Black & white.
990c609719bSwdenk
991c609719bSwdenk		Normally display is black on white background; define
992c609719bSwdenk		CFG_WHITE_ON_BLACK to get it inverted.
993c609719bSwdenk
9947152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
995d791b1dcSwdenk
996d791b1dcSwdenk		If this option is set, the environment is checked for
997d791b1dcSwdenk		a variable "splashimage". If found, the usual display
998d791b1dcSwdenk		of logo, copyright and system information on the LCD
999e94d2cd9Swdenk		is suppressed and the BMP image at the address
1000d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1001d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1002d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1003d791b1dcSwdenk		loaded very quickly after power-on.
1004d791b1dcSwdenk
100598f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
100698f4a3dfSStefan Roese
100798f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
100898f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
100998f4a3dfSStefan Roese		splashscreen support or the bmp command.
101098f4a3dfSStefan Roese
1011c29fdfc1Swdenk- Compression support:
1012c29fdfc1Swdenk		CONFIG_BZIP2
1013c29fdfc1Swdenk
1014c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1015c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1016c29fdfc1Swdenk		compressed images are supported.
1017c29fdfc1Swdenk
1018c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
1019c29fdfc1Swdenk		the malloc area (as defined by CFG_MALLOC_LEN) should
1020c29fdfc1Swdenk		be at least 4MB.
1021d791b1dcSwdenk
102217ea1177Swdenk- MII/PHY support:
102317ea1177Swdenk		CONFIG_PHY_ADDR
102417ea1177Swdenk
102517ea1177Swdenk		The address of PHY on MII bus.
102617ea1177Swdenk
102717ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
102817ea1177Swdenk
102917ea1177Swdenk		The clock frequency of the MII bus
103017ea1177Swdenk
103117ea1177Swdenk		CONFIG_PHY_GIGE
103217ea1177Swdenk
103317ea1177Swdenk		If this option is set, support for speed/duplex
103417ea1177Swdenk		detection of Gigabit PHY is included.
103517ea1177Swdenk
103617ea1177Swdenk		CONFIG_PHY_RESET_DELAY
103717ea1177Swdenk
103817ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
103917ea1177Swdenk		reset before any MII register access is possible.
104017ea1177Swdenk		For such PHY, set this option to the usec delay
104117ea1177Swdenk		required. (minimum 300usec for LXT971A)
104217ea1177Swdenk
104317ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
104417ea1177Swdenk
104517ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
104617ea1177Swdenk		command issued before MII status register can be read
104717ea1177Swdenk
1048c609719bSwdenk- Ethernet address:
1049c609719bSwdenk		CONFIG_ETHADDR
1050c609719bSwdenk		CONFIG_ETH2ADDR
1051c609719bSwdenk		CONFIG_ETH3ADDR
1052c609719bSwdenk
1053c609719bSwdenk		Define a default value for ethernet address to use
1054c609719bSwdenk		for the respective ethernet interface, in case this
1055c609719bSwdenk		is not determined automatically.
1056c609719bSwdenk
1057c609719bSwdenk- IP address:
1058c609719bSwdenk		CONFIG_IPADDR
1059c609719bSwdenk
1060c609719bSwdenk		Define a default value for the IP address to use for
1061c609719bSwdenk		the default ethernet interface, in case this is not
1062c609719bSwdenk		determined through e.g. bootp.
1063c609719bSwdenk
1064c609719bSwdenk- Server IP address:
1065c609719bSwdenk		CONFIG_SERVERIP
1066c609719bSwdenk
1067c609719bSwdenk		Defines a default value for theIP address of a TFTP
1068c609719bSwdenk		server to contact when using the "tftboot" command.
1069c609719bSwdenk
107053a5c424SDavid Updegraff- Multicast TFTP Mode:
107153a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
107253a5c424SDavid Updegraff
107353a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
107453a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
107553a5c424SDavid Updegraff		tftp down the same boot image concurrently.  Note: the ethernet
107653a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
107753a5c424SDavid Updegraff		multicast group.
107853a5c424SDavid Updegraff
107953a5c424SDavid Updegraff		CONFIG_BOOTP_RANDOM_DELAY
1080c609719bSwdenk- BOOTP Recovery Mode:
1081c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1082c609719bSwdenk
1083c609719bSwdenk		If you have many targets in a network that try to
1084c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1085c609719bSwdenk		systems send out BOOTP requests at precisely the same
1086c609719bSwdenk		moment (which would happen for instance at recovery
1087c609719bSwdenk		from a power failure, when all systems will try to
1088c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1089c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1090c609719bSwdenk		inserted before sending out BOOTP requests. The
10916c33c785SWolfgang Denk		following delays are inserted then:
1092c609719bSwdenk
1093c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1094c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1095c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1096c609719bSwdenk		4th and following
1097c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1098c609719bSwdenk
1099fe389a82Sstroese- DHCP Advanced Options:
11001fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
11011fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1102fe389a82Sstroese
11031fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
11041fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
11051fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
11061fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
11071fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
11081fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
11091fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
11101fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
11111fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
11121fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
11131fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
11141fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
1115fe389a82Sstroese
11165d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
11175d110f0aSWilson Callan		environment variable, not the BOOTP server.
1118fe389a82Sstroese
1119fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1120fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1121fe389a82Sstroese		than one DNS serverip is offered to the client.
1122fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1123fe389a82Sstroese		serverip will be stored in the additional environment
1124fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1125fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
11261fe80d79SJon Loeliger		is defined.
1127fe389a82Sstroese
1128fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1129fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1130fe389a82Sstroese		need the hostname of the DHCP requester.
11315d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
11321fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
11331fe80d79SJon Loeliger		option 12 to the DHCP server.
1134fe389a82Sstroese
1135a3d991bdSwdenk - CDP Options:
1136a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1137a3d991bdSwdenk
1138a3d991bdSwdenk		The device id used in CDP trigger frames.
1139a3d991bdSwdenk
1140a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1141a3d991bdSwdenk
1142a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1143a3d991bdSwdenk		of the device.
1144a3d991bdSwdenk
1145a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1146a3d991bdSwdenk
1147a3d991bdSwdenk		A printf format string which contains the ascii name of
1148a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
1149a3d991bdSwdenk		eth0 for the first ethernet, eth1 for the second etc.
1150a3d991bdSwdenk
1151a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1152a3d991bdSwdenk
1153a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1154a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1155a3d991bdSwdenk
1156a3d991bdSwdenk		CONFIG_CDP_VERSION
1157a3d991bdSwdenk
1158a3d991bdSwdenk		An ascii string containing the version of the software.
1159a3d991bdSwdenk
1160a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1161a3d991bdSwdenk
1162a3d991bdSwdenk		An ascii string containing the name of the platform.
1163a3d991bdSwdenk
1164a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1165a3d991bdSwdenk
1166a3d991bdSwdenk		A 32bit integer sent on the trigger.
1167a3d991bdSwdenk
1168a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1169a3d991bdSwdenk
1170a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1171a3d991bdSwdenk		device in .1 of milliwatts.
1172a3d991bdSwdenk
1173a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1174a3d991bdSwdenk
1175a3d991bdSwdenk		A byte containing the id of the VLAN.
1176a3d991bdSwdenk
1177c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1178c609719bSwdenk
1179c609719bSwdenk		Several configurations allow to display the current
1180c609719bSwdenk		status using a LED. For instance, the LED will blink
1181c609719bSwdenk		fast while running U-Boot code, stop blinking as
1182c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1183c609719bSwdenk		start blinking slow once the Linux kernel is running
1184c609719bSwdenk		(supported by a status LED driver in the Linux
1185c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1186c609719bSwdenk		feature in U-Boot.
1187c609719bSwdenk
1188c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1189c609719bSwdenk
1190c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1191c609719bSwdenk		on those systems that support this (optional)
1192c609719bSwdenk		feature, like the TQM8xxL modules.
1193c609719bSwdenk
1194c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1195c609719bSwdenk
1196b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1197b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
1198b37c7e5eSwdenk		include the appropriate I2C driver for the selected cpu.
1199c609719bSwdenk
1200b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1201602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1202b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1203b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1204c609719bSwdenk		command line interface.
1205c609719bSwdenk
1206bb99ad6dSBen Warren		CONFIG_I2C_CMD_TREE is a recommended option that places
1207bb99ad6dSBen Warren		all I2C commands under a single 'i2c' root command.  The
1208bb99ad6dSBen Warren		older 'imm', 'imd', 'iprobe' etc. commands are considered
1209bb99ad6dSBen Warren		deprecated and may disappear in the future.
1210bb99ad6dSBen Warren
1211bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1212c609719bSwdenk
1213b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1214b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1215b37c7e5eSwdenk		support for I2C.
1216c609719bSwdenk
1217b37c7e5eSwdenk		There are several other quantities that must also be
1218b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1219c609719bSwdenk
1220b37c7e5eSwdenk		In both cases you will need to define CFG_I2C_SPEED
1221b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
1222b37c7e5eSwdenk		to run and CFG_I2C_SLAVE to be the address of this node (ie
1223b37c7e5eSwdenk		the cpu's i2c node address).
1224c609719bSwdenk
1225b37c7e5eSwdenk		Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
1226b37c7e5eSwdenk		sets the cpu up as a master node and so its address should
1227b37c7e5eSwdenk		therefore be cleared to 0 (See, eg, MPC823e User's Manual
1228b37c7e5eSwdenk		p.16-473). So, set CFG_I2C_SLAVE to 0.
1229b37c7e5eSwdenk
1230b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1231b37c7e5eSwdenk
1232b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1233b37c7e5eSwdenk		then the following macros need to be defined (examples are
1234b37c7e5eSwdenk		from include/configs/lwmon.h):
1235c609719bSwdenk
1236c609719bSwdenk		I2C_INIT
1237c609719bSwdenk
1238b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1239c609719bSwdenk		controller or configure ports.
1240c609719bSwdenk
1241b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1242b37c7e5eSwdenk
1243c609719bSwdenk		I2C_PORT
1244c609719bSwdenk
1245c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1246c609719bSwdenk		assumes both bits are on the same port). Valid values
1247c609719bSwdenk		are 0..3 for ports A..D.
1248c609719bSwdenk
1249c609719bSwdenk		I2C_ACTIVE
1250c609719bSwdenk
1251c609719bSwdenk		The code necessary to make the I2C data line active
1252c609719bSwdenk		(driven).  If the data line is open collector, this
1253c609719bSwdenk		define can be null.
1254c609719bSwdenk
1255b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1256b37c7e5eSwdenk
1257c609719bSwdenk		I2C_TRISTATE
1258c609719bSwdenk
1259c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1260c609719bSwdenk		(inactive).  If the data line is open collector, this
1261c609719bSwdenk		define can be null.
1262c609719bSwdenk
1263b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1264b37c7e5eSwdenk
1265c609719bSwdenk		I2C_READ
1266c609719bSwdenk
1267c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1268c609719bSwdenk		FALSE if it is low.
1269c609719bSwdenk
1270b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1271b37c7e5eSwdenk
1272c609719bSwdenk		I2C_SDA(bit)
1273c609719bSwdenk
1274c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1275c609719bSwdenk		is FALSE, it clears it (low).
1276c609719bSwdenk
1277b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1278b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1279b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1280b37c7e5eSwdenk
1281c609719bSwdenk		I2C_SCL(bit)
1282c609719bSwdenk
1283c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1284c609719bSwdenk		is FALSE, it clears it (low).
1285c609719bSwdenk
1286b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1287b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1288b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1289b37c7e5eSwdenk
1290c609719bSwdenk		I2C_DELAY
1291c609719bSwdenk
1292c609719bSwdenk		This delay is invoked four times per clock cycle so this
1293c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1294b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1295b37c7e5eSwdenk		like:
1296b37c7e5eSwdenk
1297b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1298c609719bSwdenk
129947cd00faSwdenk		CFG_I2C_INIT_BOARD
130047cd00faSwdenk
130147cd00faSwdenk		When a board is reset during an i2c bus transfer
130247cd00faSwdenk		chips might think that the current transfer is still
130347cd00faSwdenk		in progress. On some boards it is possible to access
130447cd00faSwdenk		the i2c SCLK line directly, either by using the
130547cd00faSwdenk		processor pin as a GPIO or by having a second pin
130647cd00faSwdenk		connected to the bus. If this option is defined a
130747cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
130847cd00faSwdenk		is run early in the boot sequence.
130947cd00faSwdenk
131017ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
131117ea1177Swdenk
131217ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
131317ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
131417ea1177Swdenk		variable "i2cfast". (see also i2cfast)
131517ea1177Swdenk
1316bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1317bb99ad6dSBen Warren
1318bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1319bb99ad6dSBen Warren		must have a controller.  At any point in time, only one bus is
1320bb99ad6dSBen Warren		active.  To switch to a different bus, use the 'i2c dev' command.
1321bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1322bb99ad6dSBen Warren
1323bb99ad6dSBen Warren		CFG_I2C_NOPROBES
1324bb99ad6dSBen Warren
1325bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
1326bb99ad6dSBen Warren		when the 'i2c probe' command is issued (or 'iprobe' using the legacy
1327bb99ad6dSBen Warren		command).  If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device
1328bb99ad6dSBen Warren		pairs.  Otherwise, specify a 1D array of device addresses
1329bb99ad6dSBen Warren
1330bb99ad6dSBen Warren		e.g.
1331bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
1332bb99ad6dSBen Warren			#define CFG_I2C_NOPROBES	{0x50,0x68}
1333bb99ad6dSBen Warren
1334bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1335bb99ad6dSBen Warren
1336bb99ad6dSBen Warren			#define	CONFIG_I2C_MULTI_BUS
1337bb99ad6dSBen Warren			#define CFG_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1338bb99ad6dSBen Warren
1339bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1340bb99ad6dSBen Warren
1341be5e6181STimur Tabi		CFG_SPD_BUS_NUM
1342be5e6181STimur Tabi
1343be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1344be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1345be5e6181STimur Tabi
13460dc018ecSStefan Roese		CFG_RTC_BUS_NUM
13470dc018ecSStefan Roese
13480dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
13490dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
13500dc018ecSStefan Roese
13510dc018ecSStefan Roese		CFG_DTT_BUS_NUM
13520dc018ecSStefan Roese
13530dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
13540dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
13550dc018ecSStefan Roese
1356be5e6181STimur Tabi		CONFIG_FSL_I2C
1357be5e6181STimur Tabi
1358be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
13597817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1360be5e6181STimur Tabi
1361be5e6181STimur Tabi
1362c609719bSwdenk- SPI Support:	CONFIG_SPI
1363c609719bSwdenk
1364c609719bSwdenk		Enables SPI driver (so far only tested with
1365c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1366c609719bSwdenk		D/As on the SACSng board)
1367c609719bSwdenk
1368c609719bSwdenk		CONFIG_SPI_X
1369c609719bSwdenk
1370c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1371c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1372c609719bSwdenk
1373c609719bSwdenk		CONFIG_SOFT_SPI
1374c609719bSwdenk
1375c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1376c609719bSwdenk		using hardware support. This is a general purpose
1377c609719bSwdenk		driver that only requires three general I/O port pins
1378c609719bSwdenk		(two outputs, one input) to function. If this is
1379c609719bSwdenk		defined, the board configuration must define several
1380c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1381c609719bSwdenk		an example, see include/configs/sacsng.h.
1382c609719bSwdenk
138304a9e118SBen Warren		CONFIG_HARD_SPI
138404a9e118SBen Warren
138504a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
138604a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
138704a9e118SBen Warren		must define a list of chip-select function pointers.
138804a9e118SBen Warren		Currently supported on some MPC8xxx processors.  For an
138904a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
139004a9e118SBen Warren
13910133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
13920133502eSMatthias Fuchs
13930133502eSMatthias Fuchs		Enables FPGA subsystem.
13940133502eSMatthias Fuchs
13950133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
13960133502eSMatthias Fuchs
13970133502eSMatthias Fuchs		Enables support for specific chip vendors.
13980133502eSMatthias Fuchs		(ALTERA, XILINX)
13990133502eSMatthias Fuchs
14000133502eSMatthias Fuchs		CONFIG_FPGA_<family>
14010133502eSMatthias Fuchs
14020133502eSMatthias Fuchs		Enables support for FPGA family.
14030133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
14040133502eSMatthias Fuchs
14050133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
1406c609719bSwdenk
1407c609719bSwdenk		Specify the number of FPGA devices to support.
1408c609719bSwdenk
1409c609719bSwdenk		CFG_FPGA_PROG_FEEDBACK
1410c609719bSwdenk
1411c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1412c609719bSwdenk
1413c609719bSwdenk		CFG_FPGA_CHECK_BUSY
1414c609719bSwdenk
1415c609719bSwdenk		Enable checks on FPGA configuration interface busy
1416c609719bSwdenk		status by the configuration function. This option
1417c609719bSwdenk		will require a board or device specific function to
1418c609719bSwdenk		be written.
1419c609719bSwdenk
1420c609719bSwdenk		CONFIG_FPGA_DELAY
1421c609719bSwdenk
1422c609719bSwdenk		If defined, a function that provides delays in the FPGA
1423c609719bSwdenk		configuration driver.
1424c609719bSwdenk
1425c609719bSwdenk		CFG_FPGA_CHECK_CTRLC
1426c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1427c609719bSwdenk
1428c609719bSwdenk		CFG_FPGA_CHECK_ERROR
1429c609719bSwdenk
1430c609719bSwdenk		Check for configuration errors during FPGA bitfile
1431c609719bSwdenk		loading. For example, abort during Virtex II
1432c609719bSwdenk		configuration if the INIT_B line goes low (which
1433c609719bSwdenk		indicated a CRC error).
1434c609719bSwdenk
1435c609719bSwdenk		CFG_FPGA_WAIT_INIT
1436c609719bSwdenk
1437c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1438c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1439c609719bSwdenk		FPGA configuration sequence. The default time is 500
1440c609719bSwdenk		mS.
1441c609719bSwdenk
1442c609719bSwdenk		CFG_FPGA_WAIT_BUSY
1443c609719bSwdenk
1444c609719bSwdenk		Maximum time to wait for BUSY to deassert during
1445c609719bSwdenk		Virtex II FPGA configuration. The default is 5 mS.
1446c609719bSwdenk
1447c609719bSwdenk		CFG_FPGA_WAIT_CONFIG
1448c609719bSwdenk
1449c609719bSwdenk		Time to wait after FPGA configuration. The default is
1450c609719bSwdenk		200 mS.
1451c609719bSwdenk
1452c609719bSwdenk- Configuration Management:
1453c609719bSwdenk		CONFIG_IDENT_STRING
1454c609719bSwdenk
1455c609719bSwdenk		If defined, this string will be added to the U-Boot
1456c609719bSwdenk		version information (U_BOOT_VERSION)
1457c609719bSwdenk
1458c609719bSwdenk- Vendor Parameter Protection:
1459c609719bSwdenk
1460c609719bSwdenk		U-Boot considers the values of the environment
1461c609719bSwdenk		variables "serial#" (Board Serial Number) and
14627152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
1463c609719bSwdenk		are set once by the board vendor / manufacturer, and
1464c609719bSwdenk		protects these variables from casual modification by
1465c609719bSwdenk		the user. Once set, these variables are read-only,
1466c609719bSwdenk		and write or delete attempts are rejected. You can
1467c609719bSwdenk		change this behviour:
1468c609719bSwdenk
1469c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
1470c609719bSwdenk		file, the write protection for vendor parameters is
147147cd00faSwdenk		completely disabled. Anybody can change or delete
1472c609719bSwdenk		these parameters.
1473c609719bSwdenk
1474c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
1475c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1476c609719bSwdenk		ethernet address is installed in the environment,
1477c609719bSwdenk		which can be changed exactly ONCE by the user. [The
1478c609719bSwdenk		serial# is unaffected by this, i. e. it remains
1479c609719bSwdenk		read-only.]
1480c609719bSwdenk
1481c609719bSwdenk- Protected RAM:
1482c609719bSwdenk		CONFIG_PRAM
1483c609719bSwdenk
1484c609719bSwdenk		Define this variable to enable the reservation of
1485c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
1486c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
1487c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
1488c609719bSwdenk		this default value by defining an environment
1489c609719bSwdenk		variable "pram" to the number of kB you want to
1490c609719bSwdenk		reserve. Note that the board info structure will
1491c609719bSwdenk		still show the full amount of RAM. If pRAM is
1492c609719bSwdenk		reserved, a new environment variable "mem" will
1493c609719bSwdenk		automatically be defined to hold the amount of
1494c609719bSwdenk		remaining RAM in a form that can be passed as boot
1495c609719bSwdenk		argument to Linux, for instance like that:
1496c609719bSwdenk
1497fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
1498c609719bSwdenk			saveenv
1499c609719bSwdenk
1500c609719bSwdenk		This way you can tell Linux not to use this memory,
1501c609719bSwdenk		either, which results in a memory region that will
1502c609719bSwdenk		not be affected by reboots.
1503c609719bSwdenk
1504c609719bSwdenk		*WARNING* If your board configuration uses automatic
1505c609719bSwdenk		detection of the RAM size, you must make sure that
1506c609719bSwdenk		this memory test is non-destructive. So far, the
1507c609719bSwdenk		following board configurations are known to be
1508c609719bSwdenk		"pRAM-clean":
1509c609719bSwdenk
1510c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1511c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
1512c609719bSwdenk			PCU_E, FLAGADM, TQM8260
1513c609719bSwdenk
1514c609719bSwdenk- Error Recovery:
1515c609719bSwdenk		CONFIG_PANIC_HANG
1516c609719bSwdenk
1517c609719bSwdenk		Define this variable to stop the system in case of a
1518c609719bSwdenk		fatal error, so that you have to reset it manually.
1519c609719bSwdenk		This is probably NOT a good idea for an embedded
1520c609719bSwdenk		system where you want to system to reboot
1521c609719bSwdenk		automatically as fast as possible, but it may be
1522c609719bSwdenk		useful during development since you can try to debug
1523c609719bSwdenk		the conditions that lead to the situation.
1524c609719bSwdenk
1525c609719bSwdenk		CONFIG_NET_RETRY_COUNT
1526c609719bSwdenk
1527c609719bSwdenk		This variable defines the number of retries for
1528c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
1529c609719bSwdenk		before giving up the operation. If not defined, a
1530c609719bSwdenk		default value of 5 is used.
1531c609719bSwdenk
1532c609719bSwdenk- Command Interpreter:
15338078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
153404a85b3bSwdenk
153504a85b3bSwdenk		Enable auto completion of commands using TAB.
153604a85b3bSwdenk
15378078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
15388078f1a5SWolfgang Denk		for the "hush" shell.
15398078f1a5SWolfgang Denk
15408078f1a5SWolfgang Denk
1541c609719bSwdenk		CFG_HUSH_PARSER
1542c609719bSwdenk
1543c609719bSwdenk		Define this variable to enable the "hush" shell (from
1544c609719bSwdenk		Busybox) as command line interpreter, thus enabling
1545c609719bSwdenk		powerful command line syntax like
1546c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
1547c609719bSwdenk		constructs ("shell scripts").
1548c609719bSwdenk
1549c609719bSwdenk		If undefined, you get the old, much simpler behaviour
1550c609719bSwdenk		with a somewhat smaller memory footprint.
1551c609719bSwdenk
1552c609719bSwdenk
1553c609719bSwdenk		CFG_PROMPT_HUSH_PS2
1554c609719bSwdenk
1555c609719bSwdenk		This defines the secondary prompt string, which is
1556c609719bSwdenk		printed when the command interpreter needs more input
1557c609719bSwdenk		to complete a command. Usually "> ".
1558c609719bSwdenk
1559c609719bSwdenk	Note:
1560c609719bSwdenk
1561c609719bSwdenk		In the current implementation, the local variables
1562c609719bSwdenk		space and global environment variables space are
1563c609719bSwdenk		separated. Local variables are those you define by
15643b57fe0aSwdenk		simply typing `name=value'. To access a local
1565c609719bSwdenk		variable later on, you have write `$name' or
15663b57fe0aSwdenk		`${name}'; to execute the contents of a variable
15673b57fe0aSwdenk		directly type `$name' at the command prompt.
1568c609719bSwdenk
1569c609719bSwdenk		Global environment variables are those you use
1570c609719bSwdenk		setenv/printenv to work with. To run a command stored
1571c609719bSwdenk		in such a variable, you need to use the run command,
1572c609719bSwdenk		and you must not use the '$' sign to access them.
1573c609719bSwdenk
1574c609719bSwdenk		To store commands and special characters in a
1575c609719bSwdenk		variable, please use double quotation marks
1576c609719bSwdenk		surrounding the whole text of the variable, instead
1577c609719bSwdenk		of the backslashes before semicolons and special
1578c609719bSwdenk		symbols.
1579c609719bSwdenk
1580aa0c71acSWolfgang Denk- Commandline Editing and History:
1581aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
1582aa0c71acSWolfgang Denk
1583aa0c71acSWolfgang Denk		Enable editiong and History functions for interactive
1584aa0c71acSWolfgang Denk		commandline input operations
1585aa0c71acSWolfgang Denk
1586a8c7c708Swdenk- Default Environment:
1587c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
1588c609719bSwdenk
1589c609719bSwdenk		Define this to contain any number of null terminated
1590c609719bSwdenk		strings (variable = value pairs) that will be part of
15917152b1d0Swdenk		the default environment compiled into the boot image.
15922262cfeeSwdenk
1593c609719bSwdenk		For example, place something like this in your
1594c609719bSwdenk		board's config file:
1595c609719bSwdenk
1596c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
1597c609719bSwdenk			"myvar1=value1\0" \
1598c609719bSwdenk			"myvar2=value2\0"
1599c609719bSwdenk
1600c609719bSwdenk		Warning: This method is based on knowledge about the
1601c609719bSwdenk		internal format how the environment is stored by the
16022262cfeeSwdenk		U-Boot code. This is NOT an official, exported
1603c609719bSwdenk		interface! Although it is unlikely that this format
16047152b1d0Swdenk		will change soon, there is no guarantee either.
1605c609719bSwdenk		You better know what you are doing here.
1606c609719bSwdenk
1607c609719bSwdenk		Note: overly (ab)use of the default environment is
1608c609719bSwdenk		discouraged. Make sure to check other ways to preset
1609c609719bSwdenk		the environment like the autoscript function or the
1610c609719bSwdenk		boot command first.
1611c609719bSwdenk
1612a8c7c708Swdenk- DataFlash Support:
16132abbe075Swdenk		CONFIG_HAS_DATAFLASH
16142abbe075Swdenk
16152abbe075Swdenk		Defining this option enables DataFlash features and
16162abbe075Swdenk		allows to read/write in Dataflash via the standard
16172abbe075Swdenk		commands cp, md...
16182abbe075Swdenk
16193f85ce27Swdenk- SystemACE Support:
16203f85ce27Swdenk		CONFIG_SYSTEMACE
16213f85ce27Swdenk
16223f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
16233f85ce27Swdenk		chips attached via some sort of local bus. The address
16243f85ce27Swdenk		of the chip must alsh be defined in the
16253f85ce27Swdenk		CFG_SYSTEMACE_BASE macro. For example:
16263f85ce27Swdenk
16273f85ce27Swdenk		#define CONFIG_SYSTEMACE
16283f85ce27Swdenk		#define CFG_SYSTEMACE_BASE 0xf0000000
16293f85ce27Swdenk
16303f85ce27Swdenk		When SystemACE support is added, the "ace" device type
16313f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
16323f85ce27Swdenk
1633ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
1634ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
1635ecb0ccd9SWolfgang Denk
163628cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
1637ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
163828cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
1639ecb0ccd9SWolfgang Denk		number generator is used.
1640ecb0ccd9SWolfgang Denk
164128cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
164228cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
164328cb9375SWolfgang Denk		defined, the normal port 69 is used.
164428cb9375SWolfgang Denk
164528cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
1646ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
1647ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
1648ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
1649ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
1650ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
1651ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
1652ecb0ccd9SWolfgang Denk
1653a8c7c708Swdenk- Show boot progress:
1654c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
1655c609719bSwdenk
1656c609719bSwdenk		Defining this option allows to add some board-
1657c609719bSwdenk		specific code (calling a user-provided function
1658c609719bSwdenk		"show_boot_progress(int)") that enables you to show
1659c609719bSwdenk		the system's boot progress on some display (for
1660c609719bSwdenk		example, some LED's) on your board. At the moment,
1661c609719bSwdenk		the following checkpoints are implemented:
1662c609719bSwdenk
1663c609719bSwdenk  Arg	Where			When
1664c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
1665c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
1666c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
1667c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
1668c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
1669c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
1670c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
1671c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
1672c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
1673c609719bSwdenk   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi, standalone)
1674c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
1675c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
1676c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
1677c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
1678c609719bSwdenk   -8	common/cmd_bootm.c	Wrong Image Type (not kernel, multi, standalone)
1679c609719bSwdenk    8	common/cmd_bootm.c	Image Type check OK
1680c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
1681c609719bSwdenk    9	common/cmd_bootm.c	Start initial ramdisk verification
1682c609719bSwdenk  -10	common/cmd_bootm.c	Ramdisk header has bad	   magic number
1683c609719bSwdenk  -11	common/cmd_bootm.c	Ramdisk header has bad	   checksum
1684c609719bSwdenk   10	common/cmd_bootm.c	Ramdisk header is OK
1685c609719bSwdenk  -12	common/cmd_bootm.c	Ramdisk data   has bad	   checksum
1686c609719bSwdenk   11	common/cmd_bootm.c	Ramdisk data   has correct checksum
1687c609719bSwdenk   12	common/cmd_bootm.c	Ramdisk verification complete, start loading
1688c609719bSwdenk  -13	common/cmd_bootm.c	Wrong Image Type (not PPC Linux Ramdisk)
1689c609719bSwdenk   13	common/cmd_bootm.c	Start multifile image verification
1690c609719bSwdenk   14	common/cmd_bootm.c	No initial ramdisk, no multifile, continue.
1691c609719bSwdenk   15	common/cmd_bootm.c	All preparation done, transferring control to OS
1692c609719bSwdenk
169363e73c9aSwdenk  -30	lib_ppc/board.c		Fatal error, hang the system
169463e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
169563e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
169663e73c9aSwdenk
1697566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
1698566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
1699566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
1700566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
1701566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
1702566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
1703566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
1704566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
1705566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
1706566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
1707566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
1708566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
1709566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
1710566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
1711566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
1712566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
1713566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
1714566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
1715566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
1716566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
1717566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
1718566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
1719566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
1720566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
1721566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
1722566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
1723566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
1724566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
1725566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
1726566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
1727566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
1728566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
1729566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
1730566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
1731566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
1732566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
1733566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
1734566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
1735566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
1736566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
1737566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
1738566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
1739566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
1740566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
1741566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
1742566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
1743566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
1744c609719bSwdenk
1745566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
1746c609719bSwdenk
1747566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernetconfiguration.
1748566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
1749566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
1750206c60cbSwdenk
1751566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
1752566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
1753566a494fSHeiko Schocher  -81	common/cmd_net.c	some error in NetLoop() occured
1754566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
1755566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
1756566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
1757566a494fSHeiko Schocher   83	common/cmd_net.c	running autoscript
1758566a494fSHeiko Schocher  -83	common/cmd_net.c	some error in automatic boot or autoscript
1759566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
1760c609719bSwdenk
1761c609719bSwdenkModem Support:
1762c609719bSwdenk--------------
1763c609719bSwdenk
176485ec0bccSwdenk[so far only for SMDK2400 and TRAB boards]
1765c609719bSwdenk
1766c609719bSwdenk- Modem support endable:
1767c609719bSwdenk		CONFIG_MODEM_SUPPORT
1768c609719bSwdenk
1769c609719bSwdenk- RTS/CTS Flow control enable:
1770c609719bSwdenk		CONFIG_HWFLOW
1771c609719bSwdenk
1772c609719bSwdenk- Modem debug support:
1773c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
1774c609719bSwdenk
1775c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
1776c609719bSwdenk		for modem support. Useful only with BDI2000.
1777c609719bSwdenk
1778a8c7c708Swdenk- Interrupt support (PPC):
1779a8c7c708Swdenk
1780a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
1781a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
1782a8c7c708Swdenk		for cpu specific initialization. interrupt_init_cpu()
1783a8c7c708Swdenk		should set decrementer_count to appropriate value. If
1784a8c7c708Swdenk		cpu resets decrementer automatically after interrupt
1785a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
1786a8c7c708Swdenk		timer_interrupt() calls timer_interrupt_cpu() for cpu
1787a8c7c708Swdenk		specific handling. If board has watchdog / status_led
1788a8c7c708Swdenk		/ other_activity_monitor it works automatically from
1789a8c7c708Swdenk		general timer_interrupt().
1790a8c7c708Swdenk
1791c609719bSwdenk- General:
1792c609719bSwdenk
1793c609719bSwdenk		In the target system modem support is enabled when a
1794c609719bSwdenk		specific key (key combination) is pressed during
1795c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
1796c609719bSwdenk		(autoboot). The key_pressed() fuction is called from
1797c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
1798c609719bSwdenk		function, returning 1 and thus enabling modem
1799c609719bSwdenk		initialization.
1800c609719bSwdenk
1801c609719bSwdenk		If there are no modem init strings in the
1802c609719bSwdenk		environment, U-Boot proceed to autoboot; the
1803c609719bSwdenk		previous output (banner, info printfs) will be
1804c609719bSwdenk		supressed, though.
1805c609719bSwdenk
1806c609719bSwdenk		See also: doc/README.Modem
1807c609719bSwdenk
1808c609719bSwdenk
1809c609719bSwdenkConfiguration Settings:
1810c609719bSwdenk-----------------------
1811c609719bSwdenk
1812c609719bSwdenk- CFG_LONGHELP: Defined when you want long help messages included;
1813c609719bSwdenk		undefine this when you're short of memory.
1814c609719bSwdenk
1815c609719bSwdenk- CFG_PROMPT:	This is what U-Boot prints on the console to
1816c609719bSwdenk		prompt for user input.
1817c609719bSwdenk
1818c609719bSwdenk- CFG_CBSIZE:	Buffer size for input from the Console
1819c609719bSwdenk
1820c609719bSwdenk- CFG_PBSIZE:	Buffer size for Console output
1821c609719bSwdenk
1822c609719bSwdenk- CFG_MAXARGS:	max. Number of arguments accepted for monitor commands
1823c609719bSwdenk
1824c609719bSwdenk- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
1825c609719bSwdenk		the application (usually a Linux kernel) when it is
1826c609719bSwdenk		booted
1827c609719bSwdenk
1828c609719bSwdenk- CFG_BAUDRATE_TABLE:
1829c609719bSwdenk		List of legal baudrate settings for this board.
1830c609719bSwdenk
1831c609719bSwdenk- CFG_CONSOLE_INFO_QUIET
1832c609719bSwdenk		Suppress display of console information at boot.
1833c609719bSwdenk
1834c609719bSwdenk- CFG_CONSOLE_IS_IN_ENV
1835c609719bSwdenk		If the board specific function
1836c609719bSwdenk			extern int overwrite_console (void);
1837c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
1838c609719bSwdenk		serial port, else the settings in the environment are used.
1839c609719bSwdenk
1840c609719bSwdenk- CFG_CONSOLE_OVERWRITE_ROUTINE
1841c609719bSwdenk		Enable the call to overwrite_console().
1842c609719bSwdenk
1843c609719bSwdenk- CFG_CONSOLE_ENV_OVERWRITE
1844c609719bSwdenk		Enable overwrite of previous console environment settings.
1845c609719bSwdenk
1846c609719bSwdenk- CFG_MEMTEST_START, CFG_MEMTEST_END:
1847c609719bSwdenk		Begin and End addresses of the area used by the
1848c609719bSwdenk		simple memory test.
1849c609719bSwdenk
1850c609719bSwdenk- CFG_ALT_MEMTEST:
1851c609719bSwdenk		Enable an alternate, more extensive memory test.
1852c609719bSwdenk
18535f535fe1Swdenk- CFG_MEMTEST_SCRATCH:
18545f535fe1Swdenk		Scratch address used by the alternate memory test
18555f535fe1Swdenk		You only need to set this if address zero isn't writeable
18565f535fe1Swdenk
1857c609719bSwdenk- CFG_TFTP_LOADADDR:
1858c609719bSwdenk		Default load address for network file downloads
1859c609719bSwdenk
1860c609719bSwdenk- CFG_LOADS_BAUD_CHANGE:
1861c609719bSwdenk		Enable temporary baudrate change while serial download
1862c609719bSwdenk
1863c609719bSwdenk- CFG_SDRAM_BASE:
1864c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
1865c609719bSwdenk
1866c609719bSwdenk- CFG_MBIO_BASE:
1867c609719bSwdenk		Physical start address of Motherboard I/O (if using a
1868c609719bSwdenk		Cogent motherboard)
1869c609719bSwdenk
1870c609719bSwdenk- CFG_FLASH_BASE:
1871c609719bSwdenk		Physical start address of Flash memory.
1872c609719bSwdenk
1873c609719bSwdenk- CFG_MONITOR_BASE:
1874c609719bSwdenk		Physical start address of boot monitor code (set by
1875c609719bSwdenk		make config files to be same as the text base address
1876c609719bSwdenk		(TEXT_BASE) used when linking) - same as
1877c609719bSwdenk		CFG_FLASH_BASE when booting from flash.
1878c609719bSwdenk
1879c609719bSwdenk- CFG_MONITOR_LEN:
18803b57fe0aSwdenk		Size of memory reserved for monitor code, used to
18813b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
18823b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
18833b57fe0aSwdenk		flash sector.
1884c609719bSwdenk
1885c609719bSwdenk- CFG_MALLOC_LEN:
1886c609719bSwdenk		Size of DRAM reserved for malloc() use.
1887c609719bSwdenk
188815940c9aSStefan Roese- CFG_BOOTM_LEN:
188915940c9aSStefan Roese		Normally compressed uImages are limited to an
189015940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
189115940c9aSStefan Roese		you can define CFG_BOOTM_LEN in your board config file
189215940c9aSStefan Roese		to adjust this setting to your needs.
1893c609719bSwdenk
1894c609719bSwdenk- CFG_BOOTMAPSZ:
1895c609719bSwdenk		Maximum size of memory mapped by the startup code of
1896c609719bSwdenk		the Linux kernel; all data that must be processed by
1897c609719bSwdenk		the Linux kernel (bd_info, boot arguments, eventually
1898c609719bSwdenk		initrd image) must be put below this limit.
1899c609719bSwdenk
1900c609719bSwdenk- CFG_MAX_FLASH_BANKS:
1901c609719bSwdenk		Max number of Flash memory banks
1902c609719bSwdenk
1903c609719bSwdenk- CFG_MAX_FLASH_SECT:
1904c609719bSwdenk		Max number of sectors on a Flash chip
1905c609719bSwdenk
1906c609719bSwdenk- CFG_FLASH_ERASE_TOUT:
1907c609719bSwdenk		Timeout for Flash erase operations (in ms)
1908c609719bSwdenk
1909c609719bSwdenk- CFG_FLASH_WRITE_TOUT:
1910c609719bSwdenk		Timeout for Flash write operations (in ms)
1911c609719bSwdenk
19128564acf9Swdenk- CFG_FLASH_LOCK_TOUT
19138564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
19148564acf9Swdenk
19158564acf9Swdenk- CFG_FLASH_UNLOCK_TOUT
19168564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
19178564acf9Swdenk
19188564acf9Swdenk- CFG_FLASH_PROTECTION
19198564acf9Swdenk		If defined, hardware flash sectors protection is used
19208564acf9Swdenk		instead of U-Boot software protection.
19218564acf9Swdenk
1922c609719bSwdenk- CFG_DIRECT_FLASH_TFTP:
1923c609719bSwdenk
1924c609719bSwdenk		Enable TFTP transfers directly to flash memory;
1925c609719bSwdenk		without this option such a download has to be
1926c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
1927c609719bSwdenk		copy from RAM to flash.
1928c609719bSwdenk
1929c609719bSwdenk		The two-step approach is usually more reliable, since
1930c609719bSwdenk		you can check if the download worked before you erase
1931c609719bSwdenk		the flash, but in some situations (when sytem RAM is
1932c609719bSwdenk		too limited to allow for a tempory copy of the
1933c609719bSwdenk		downloaded image) this option may be very useful.
1934c609719bSwdenk
1935c609719bSwdenk- CFG_FLASH_CFI:
1936c609719bSwdenk		Define if the flash driver uses extra elements in the
19375653fc33Swdenk		common flash structure for storing flash geometry.
19385653fc33Swdenk
19395653fc33Swdenk- CFG_FLASH_CFI_DRIVER
19405653fc33Swdenk		This option also enables the building of the cfi_flash driver
19415653fc33Swdenk		in the drivers directory
194253cf9435Sstroese
19435568e613SStefan Roese- CFG_FLASH_QUIET_TEST
19445568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
19455568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
19465568e613SStefan Roese		is useful, if some of the configured banks are only
19475568e613SStefan Roese		optionally available.
19485568e613SStefan Roese
1949*9a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
1950*9a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
1951*9a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
1952*9a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
1953*9a042e9cSJerry Van Baren
195453cf9435Sstroese- CFG_RX_ETH_BUFFER:
195553cf9435Sstroese		Defines the number of ethernet receive buffers. On some
195653cf9435Sstroese		ethernet controllers it is recommended to set this value
195753cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
195853cf9435Sstroese		buffers can be full shortly after enabling the interface
195953cf9435Sstroese		on high ethernet traffic.
196053cf9435Sstroese		Defaults to 4 if not defined.
1961c609719bSwdenk
1962c609719bSwdenkThe following definitions that deal with the placement and management
1963c609719bSwdenkof environment data (variable area); in general, we support the
1964c609719bSwdenkfollowing configurations:
1965c609719bSwdenk
1966c609719bSwdenk- CFG_ENV_IS_IN_FLASH:
1967c609719bSwdenk
1968c609719bSwdenk	Define this if the environment is in flash memory.
1969c609719bSwdenk
1970c609719bSwdenk	a) The environment occupies one whole flash sector, which is
1971c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
1972c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
1973c609719bSwdenk	   sector" type flash chips, which have several smaller
1974c609719bSwdenk	   sectors at the start or the end. For instance, such a
1975c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
1976c609719bSwdenk	   such a case you would place the environment in one of the
1977c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
1978c609719bSwdenk	   "top boot sector" type flash chips, you would put the
1979c609719bSwdenk	   environment in one of the last sectors, leaving a gap
1980c609719bSwdenk	   between U-Boot and the environment.
1981c609719bSwdenk
1982c609719bSwdenk	- CFG_ENV_OFFSET:
1983c609719bSwdenk
1984c609719bSwdenk	   Offset of environment data (variable area) to the
1985c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
1986c609719bSwdenk	   type flash chips the second sector can be used: the offset
1987c609719bSwdenk	   for this sector is given here.
1988c609719bSwdenk
1989c609719bSwdenk	   CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
1990c609719bSwdenk
1991c609719bSwdenk	- CFG_ENV_ADDR:
1992c609719bSwdenk
1993c609719bSwdenk	   This is just another way to specify the start address of
1994c609719bSwdenk	   the flash sector containing the environment (instead of
1995c609719bSwdenk	   CFG_ENV_OFFSET).
1996c609719bSwdenk
1997c609719bSwdenk	- CFG_ENV_SECT_SIZE:
1998c609719bSwdenk
1999c609719bSwdenk	   Size of the sector containing the environment.
2000c609719bSwdenk
2001c609719bSwdenk
2002c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2003c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2004c609719bSwdenk	   the environment.
2005c609719bSwdenk
2006c609719bSwdenk	- CFG_ENV_SIZE:
2007c609719bSwdenk
2008c609719bSwdenk	   If you use this in combination with CFG_ENV_IS_IN_FLASH
2009c609719bSwdenk	   and CFG_ENV_SECT_SIZE, you can specify to use only a part
2010c609719bSwdenk	   of this flash sector for the environment. This saves
2011c609719bSwdenk	   memory for the RAM copy of the environment.
2012c609719bSwdenk
2013c609719bSwdenk	   It may also save flash memory if you decide to use this
2014c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2015c609719bSwdenk	   since then the remainder of the flash sector could be used
2016c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2017c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2018c609719bSwdenk	   updating the environment in flash makes it always
2019c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2020c609719bSwdenk	   wrong before the contents has been restored from a copy in
2021c609719bSwdenk	   RAM, your target system will be dead.
2022c609719bSwdenk
2023c609719bSwdenk	- CFG_ENV_ADDR_REDUND
2024c609719bSwdenk	  CFG_ENV_SIZE_REDUND
2025c609719bSwdenk
2026c609719bSwdenk	   These settings describe a second storage area used to hold
2027c609719bSwdenk	   a redundand copy of the environment data, so that there is
20283e38691eSwdenk	   a valid backup copy in case there is a power failure during
2029c609719bSwdenk	   a "saveenv" operation.
2030c609719bSwdenk
2031c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2032c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2033c609719bSwdenkaccordingly!
2034c609719bSwdenk
2035c609719bSwdenk
2036c609719bSwdenk- CFG_ENV_IS_IN_NVRAM:
2037c609719bSwdenk
2038c609719bSwdenk	Define this if you have some non-volatile memory device
2039c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2040c609719bSwdenk	environment.
2041c609719bSwdenk
2042c609719bSwdenk	- CFG_ENV_ADDR:
2043c609719bSwdenk	- CFG_ENV_SIZE:
2044c609719bSwdenk
2045c609719bSwdenk	  These two #defines are used to determin the memory area you
2046c609719bSwdenk	  want to use for environment. It is assumed that this memory
2047c609719bSwdenk	  can just be read and written to, without any special
2048c609719bSwdenk	  provision.
2049c609719bSwdenk
2050c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
2051c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
2052c609719bSwdenkconsole baudrate). You *MUST* have mappend your NVRAM area then, or
2053c609719bSwdenkU-Boot will hang.
2054c609719bSwdenk
2055c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
2056c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
2057c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
2058c609719bSwdenkto save the current settings.
2059c609719bSwdenk
2060c609719bSwdenk
2061c609719bSwdenk- CFG_ENV_IS_IN_EEPROM:
2062c609719bSwdenk
2063c609719bSwdenk	Use this if you have an EEPROM or similar serial access
2064c609719bSwdenk	device and a driver for it.
2065c609719bSwdenk
2066c609719bSwdenk	- CFG_ENV_OFFSET:
2067c609719bSwdenk	- CFG_ENV_SIZE:
2068c609719bSwdenk
2069c609719bSwdenk	  These two #defines specify the offset and size of the
2070c609719bSwdenk	  environment area within the total memory of your EEPROM.
2071c609719bSwdenk
2072c609719bSwdenk	- CFG_I2C_EEPROM_ADDR:
2073c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
2074c609719bSwdenk	  The default address is zero.
2075c609719bSwdenk
2076c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_BITS:
2077c609719bSwdenk	  If defined, the number of bits used to address bytes in a
2078c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
2079c609719bSwdenk	  would require six bits.
2080c609719bSwdenk
2081c609719bSwdenk	- CFG_EEPROM_PAGE_WRITE_DELAY_MS:
2082c609719bSwdenk	  If defined, the number of milliseconds to delay between
2083c609719bSwdenk	  page writes.	The default is zero milliseconds.
2084c609719bSwdenk
2085c609719bSwdenk	- CFG_I2C_EEPROM_ADDR_LEN:
2086c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
2087c609719bSwdenk	  that this is NOT the chip address length!
2088c609719bSwdenk
20895cf91d6bSwdenk	- CFG_I2C_EEPROM_ADDR_OVERFLOW:
20905cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
20915cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
20925cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
20935cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
20945cf91d6bSwdenk	  byte chips.
20955cf91d6bSwdenk
20965cf91d6bSwdenk	  Note that we consider the length of the address field to
20975cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
20985cf91d6bSwdenk	  in the chip address.
20995cf91d6bSwdenk
2100c609719bSwdenk	- CFG_EEPROM_SIZE:
2101c609719bSwdenk	  The size in bytes of the EEPROM device.
2102c609719bSwdenk
2103c609719bSwdenk
21045779d8d9Swdenk- CFG_ENV_IS_IN_DATAFLASH:
21055779d8d9Swdenk
21065779d8d9Swdenk	Define this if you have a DataFlash memory device which you
21075779d8d9Swdenk	want to use for the environment.
21085779d8d9Swdenk
21095779d8d9Swdenk	- CFG_ENV_OFFSET:
21105779d8d9Swdenk	- CFG_ENV_ADDR:
21115779d8d9Swdenk	- CFG_ENV_SIZE:
21125779d8d9Swdenk
21135779d8d9Swdenk	  These three #defines specify the offset and size of the
21145779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
21155779d8d9Swdenk	  at the specified address.
21165779d8d9Swdenk
211713a5695bSwdenk- CFG_ENV_IS_IN_NAND:
211813a5695bSwdenk
211913a5695bSwdenk	Define this if you have a NAND device which you want to use
212013a5695bSwdenk	for the environment.
212113a5695bSwdenk
212213a5695bSwdenk	- CFG_ENV_OFFSET:
212313a5695bSwdenk	- CFG_ENV_SIZE:
212413a5695bSwdenk
212513a5695bSwdenk	  These two #defines specify the offset and size of the environment
212613a5695bSwdenk	  area within the first NAND device.
21275779d8d9Swdenk
2128e443c944SMarkus Klotzbuecher	- CFG_ENV_OFFSET_REDUND
2129e443c944SMarkus Klotzbuecher
2130e443c944SMarkus Klotzbuecher	  This setting describes a second storage area of CFG_ENV_SIZE
2131e443c944SMarkus Klotzbuecher	  size used to hold a redundant copy of the environment data,
2132e443c944SMarkus Klotzbuecher	  so that there is a valid backup copy in case there is a
2133e443c944SMarkus Klotzbuecher	  power failure during a "saveenv" operation.
2134e443c944SMarkus Klotzbuecher
2135e443c944SMarkus Klotzbuecher	Note: CFG_ENV_OFFSET and CFG_ENV_OFFSET_REDUND must be aligned
2136e443c944SMarkus Klotzbuecher	to a block boundary, and CFG_ENV_SIZE must be a multiple of
2137e443c944SMarkus Klotzbuecher	the NAND devices block size.
2138e443c944SMarkus Klotzbuecher
2139c609719bSwdenk- CFG_SPI_INIT_OFFSET
2140c609719bSwdenk
2141c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
2142c609719bSwdenk	area is used at an early stage (ROM part) if the environment
2143c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
2144c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
2145c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2146c609719bSwdenk	to be a good choice since it makes it far enough from the
2147c609719bSwdenk	start of the data area as well as from the stack pointer.
2148c609719bSwdenk
2149e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
2150c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
2151c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r()
2152c609719bSwdenkuntil then to read environment variables.
2153c609719bSwdenk
215485ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
215585ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
215685ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
215785ec0bccSwdenknecessary, because the first environment variable we need is the
215885ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
215985ec0bccSwdenkhave any device yet where we could complain.]
2160c609719bSwdenk
2161c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
2162c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
216385ec0bccSwdenkuse the "saveenv" command to store a valid environment.
2164c609719bSwdenk
2165fc3e2165Swdenk- CFG_FAULT_ECHO_LINK_DOWN:
2166fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
2167fc3e2165Swdenk
2168fc3e2165Swdenk		Note: If this option is active, then CFG_FAULT_MII_ADDR
2169fc3e2165Swdenk		      also needs to be defined.
2170fc3e2165Swdenk
2171fc3e2165Swdenk- CFG_FAULT_MII_ADDR:
2172fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
2173c609719bSwdenk
2174c40b2956Swdenk- CFG_64BIT_VSPRINTF:
2175c40b2956Swdenk		Makes vsprintf (and all *printf functions) support printing
2176c40b2956Swdenk		of 64bit values by using the L quantifier
2177c40b2956Swdenk
2178c40b2956Swdenk- CFG_64BIT_STRTOUL:
2179c40b2956Swdenk		Adds simple_strtoull that returns a 64bit value
2180c40b2956Swdenk
2181c609719bSwdenkLow Level (hardware related) configuration options:
2182dc7c9a1aSwdenk---------------------------------------------------
2183c609719bSwdenk
2184c609719bSwdenk- CFG_CACHELINE_SIZE:
2185c609719bSwdenk		Cache Line Size of the CPU.
2186c609719bSwdenk
2187c609719bSwdenk- CFG_DEFAULT_IMMR:
2188c609719bSwdenk		Default address of the IMMR after system reset.
21892535d602Swdenk
21902535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
21912535d602Swdenk		and RPXsuper) to be able to adjust the position of
21922535d602Swdenk		the IMMR register after a reset.
2193c609719bSwdenk
21947f6c2cbcSwdenk- Floppy Disk Support:
21957f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER
21967f6c2cbcSwdenk
21977f6c2cbcSwdenk		the default drive number (default value 0)
21987f6c2cbcSwdenk
21997f6c2cbcSwdenk		CFG_ISA_IO_STRIDE
22007f6c2cbcSwdenk
22017f6c2cbcSwdenk		defines the spacing between fdc chipset registers
22027f6c2cbcSwdenk		(default value 1)
22037f6c2cbcSwdenk
22047f6c2cbcSwdenk		CFG_ISA_IO_OFFSET
22057f6c2cbcSwdenk
22067f6c2cbcSwdenk		defines the offset of register from address. It
22077f6c2cbcSwdenk		depends on which part of the data bus is connected to
22087f6c2cbcSwdenk		the fdc chipset. (default value 0)
22097f6c2cbcSwdenk
22107f6c2cbcSwdenk		If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
22117f6c2cbcSwdenk		CFG_FDC_DRIVE_NUMBER are undefined, they take their
22127f6c2cbcSwdenk		default value.
22137f6c2cbcSwdenk
22147f6c2cbcSwdenk		if CFG_FDC_HW_INIT is defined, then the function
22157f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
22167f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
22177f6c2cbcSwdenk		source code. It is used to make hardware dependant
22187f6c2cbcSwdenk		initializations.
22197f6c2cbcSwdenk
222025d6712aSwdenk- CFG_IMMR:	Physical address of the Internal Memory.
222125d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
222225d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
2223c609719bSwdenk
2224c609719bSwdenk- CFG_INIT_RAM_ADDR:
2225c609719bSwdenk
22267152b1d0Swdenk		Start address of memory area that can be used for
2227c609719bSwdenk		initial data and stack; please note that this must be
2228c609719bSwdenk		writable memory that is working WITHOUT special
2229c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
2230c609719bSwdenk		will become available only after programming the
2231c609719bSwdenk		memory controller and running certain initialization
2232c609719bSwdenk		sequences.
2233c609719bSwdenk
2234c609719bSwdenk		U-Boot uses the following memory types:
2235c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2236c609719bSwdenk		- MPC824X: data cache
2237c609719bSwdenk		- PPC4xx:  data cache
2238c609719bSwdenk
223985ec0bccSwdenk- CFG_GBL_DATA_OFFSET:
2240c609719bSwdenk
2241c609719bSwdenk		Offset of the initial data structure in the memory
2242c609719bSwdenk		area defined by CFG_INIT_RAM_ADDR. Usually
224385ec0bccSwdenk		CFG_GBL_DATA_OFFSET is chosen such that the initial
2244c609719bSwdenk		data is located at the end of the available space
2245c609719bSwdenk		(sometimes written as (CFG_INIT_RAM_END -
2246c609719bSwdenk		CFG_INIT_DATA_SIZE), and the initial stack is just
2247c609719bSwdenk		below that area (growing from (CFG_INIT_RAM_ADDR +
224885ec0bccSwdenk		CFG_GBL_DATA_OFFSET) downward.
2249c609719bSwdenk
2250c609719bSwdenk	Note:
2251c609719bSwdenk		On the MPC824X (or other systems that use the data
2252c609719bSwdenk		cache for initial memory) the address chosen for
2253c609719bSwdenk		CFG_INIT_RAM_ADDR is basically arbitrary - it must
2254c609719bSwdenk		point to an otherwise UNUSED address space between
2255c609719bSwdenk		the top of RAM and the start of the PCI space.
2256c609719bSwdenk
2257c609719bSwdenk- CFG_SIUMCR:	SIU Module Configuration (11-6)
2258c609719bSwdenk
2259c609719bSwdenk- CFG_SYPCR:	System Protection Control (11-9)
2260c609719bSwdenk
2261c609719bSwdenk- CFG_TBSCR:	Time Base Status and Control (11-26)
2262c609719bSwdenk
2263c609719bSwdenk- CFG_PISCR:	Periodic Interrupt Status and Control (11-31)
2264c609719bSwdenk
2265c609719bSwdenk- CFG_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
2266c609719bSwdenk
2267c609719bSwdenk- CFG_SCCR:	System Clock and reset Control Register (15-27)
2268c609719bSwdenk
2269c609719bSwdenk- CFG_OR_TIMING_SDRAM:
2270c609719bSwdenk		SDRAM timing
2271c609719bSwdenk
2272c609719bSwdenk- CFG_MAMR_PTA:
2273c609719bSwdenk		periodic timer for refresh
2274c609719bSwdenk
2275c609719bSwdenk- CFG_DER:	Debug Event Register (37-47)
2276c609719bSwdenk
2277c609719bSwdenk- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
2278c609719bSwdenk  CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
2279c609719bSwdenk  CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
2280c609719bSwdenk  CFG_BR1_PRELIM:
2281c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2282c609719bSwdenk
2283c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
2284c609719bSwdenk  CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
2285c609719bSwdenk  CFG_OR3_PRELIM, CFG_BR3_PRELIM:
2286c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2287c609719bSwdenk
2288c609719bSwdenk- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
2289c609719bSwdenk  CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
2290c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
2291c609719bSwdenk		Prescaler definitions (SDRAM timing)
2292c609719bSwdenk
2293c609719bSwdenk- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
2294c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
2295c609719bSwdenk		define relocation offset in DPRAM [DSP2]
2296c609719bSwdenk
2297b423d055SHeiko Schocher- CFG_SMC_UCODE_PATCH, CFG_SMC_DPMEM_OFFSET [0x1FC0]:
2298b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
2299b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
2300b423d055SHeiko Schocher
2301c609719bSwdenk- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
2302c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
2303c609719bSwdenk		define relocation offset in DPRAM [SCC4]
2304c609719bSwdenk
2305c609719bSwdenk- CFG_USE_OSCCLK:
2306c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
2307c609719bSwdenk		wrong setting might damage your board. Read
2308c609719bSwdenk		doc/README.MBX before setting this variable!
2309c609719bSwdenk
2310ea909b76Swdenk- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
2311ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
2312ea909b76Swdenk		(Power On Self Tests). This definition overrides
2313ea909b76Swdenk		#define'd default value in commproc.h resp.
2314ea909b76Swdenk		cpm_8260.h.
2315ea909b76Swdenk
23165d232d0eSwdenk- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
23175d232d0eSwdenk  CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
23185d232d0eSwdenk  CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
23195d232d0eSwdenk  CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
23205d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
23215d232d0eSwdenk  CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
23225d232d0eSwdenk  CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,
23235d232d0eSwdenk  CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
23245d232d0eSwdenk		Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
23255d232d0eSwdenk
2326bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
2327bb99ad6dSBen Warren		Get DDR timing information from an I2C EEPROM.  Common with pluggable
2328bb99ad6dSBen Warren		memory modules such as SODIMMs
2329bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
2330bb99ad6dSBen Warren		I2C address of the SPD EEPROM
2331bb99ad6dSBen Warren
2332bb99ad6dSBen Warren- CFG_SPD_BUS_NUM
2333bb99ad6dSBen Warren		If SPD EEPROM is on an I2C bus other than the first one, specify here.
2334bb99ad6dSBen Warren		Note that the value must resolve to something your driver can deal with.
2335bb99ad6dSBen Warren
23362ad6b513STimur Tabi- CFG_83XX_DDR_USES_CS0
23372ad6b513STimur Tabi		Only for 83xx systems. If specified, then DDR should be configured
23382ad6b513STimur Tabi		using CS0 and CS1 instead of CS2 and CS3.
23392ad6b513STimur Tabi
23402ad6b513STimur Tabi- CFG_83XX_DDR_USES_CS0
23412ad6b513STimur Tabi		Only for 83xx systems. If specified, then DDR should be configured
23422ad6b513STimur Tabi		using CS0 and CS1 instead of CS2 and CS3.
23432ad6b513STimur Tabi
2344c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
2345c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
2346c26e454dSwdenk
2347c26e454dSwdenk- CONFIG_FEC[12]_PHY
2348c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
23496e592385Swdenk		to the given FEC; i. e.
2350c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
2351c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
2352c26e454dSwdenk
2353c26e454dSwdenk		When set to -1, means to probe for first available.
2354c26e454dSwdenk
2355c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
2356c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
2357c26e454dSwdenk		(so program the FEC to ignore it).
2358c26e454dSwdenk
2359c26e454dSwdenk- CONFIG_RMII
2360c26e454dSwdenk		Enable RMII mode for all FECs.
2361c26e454dSwdenk		Note that this is a global option, we can't
2362c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
2363c26e454dSwdenk
23645cf91d6bSwdenk- CONFIG_CRC32_VERIFY
23655cf91d6bSwdenk		Add a verify option to the crc32 command.
23665cf91d6bSwdenk		The syntax is:
23675cf91d6bSwdenk
23685cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
23695cf91d6bSwdenk
23705cf91d6bSwdenk		Where address/count indicate a memory area
23715cf91d6bSwdenk		and crc32 is the correct crc32 which the
23725cf91d6bSwdenk		area should have.
23735cf91d6bSwdenk
237456523f12Swdenk- CONFIG_LOOPW
237556523f12Swdenk		Add the "loopw" memory command. This only takes effect if
2376602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
237756523f12Swdenk
23787b466641Sstroese- CONFIG_MX_CYCLIC
23797b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
23807b466641Sstroese		"md/mw" commands.
23817b466641Sstroese		Examples:
23827b466641Sstroese
23837b466641Sstroese		=> mdc.b 10 4 500
23847b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
23857b466641Sstroese
23867b466641Sstroese		=> mwc.l 100 12345678 10
23877b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
23887b466641Sstroese
23897b466641Sstroese		This only takes effect if the memory commands are activated
2390602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
23917b466641Sstroese
23928aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
23938aa1a2d1Swdenk- CONFIG_SKIP_RELOCATE_UBOOT
23948aa1a2d1Swdenk
23958aa1a2d1Swdenk		[ARM only] If these variables are defined, then
23968aa1a2d1Swdenk		certain low level initializations (like setting up
23978aa1a2d1Swdenk		the memory controller) are omitted and/or U-Boot does
23988aa1a2d1Swdenk		not relocate itself into RAM.
23998aa1a2d1Swdenk		Normally these variables MUST NOT be defined. The
24008aa1a2d1Swdenk		only exception is when U-Boot is loaded (to RAM) by
24018aa1a2d1Swdenk		some other boot loader or by a debugger which
24028aa1a2d1Swdenk		performs these intializations itself.
24038aa1a2d1Swdenk
2404400558b5Swdenk
2405c609719bSwdenkBuilding the Software:
2406c609719bSwdenk======================
2407c609719bSwdenk
2408c609719bSwdenkBuilding U-Boot has been tested in native PPC environments (on a
2409c609719bSwdenkPowerBook G3 running LinuxPPC 2000) and in cross environments
2410c609719bSwdenk(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and
2411c609719bSwdenkNetBSD 1.5 on x86).
2412c609719bSwdenk
2413c609719bSwdenkIf you are not using a native PPC environment, it is assumed that you
2414c609719bSwdenkhave the GNU cross compiling tools available in your path and named
2415c609719bSwdenkwith a prefix of "powerpc-linux-". If this is not the case, (e.g. if
2416c609719bSwdenkyou are using Monta Vista's Hard Hat Linux CDK 1.2) you must change
2417c609719bSwdenkthe definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU,
2418c609719bSwdenkchange it to:
2419c609719bSwdenk
2420c609719bSwdenk	CROSS_COMPILE = ppc_4xx-
2421c609719bSwdenk
2422c609719bSwdenk
2423c609719bSwdenkU-Boot is intended to be  simple  to  build.  After  installing	 the
2424c609719bSwdenksources	 you must configure U-Boot for one specific board type. This
2425c609719bSwdenkis done by typing:
2426c609719bSwdenk
2427c609719bSwdenk	make NAME_config
2428c609719bSwdenk
2429c609719bSwdenkwhere "NAME_config" is the name of one of the existing
24302628114eSKim Phillipsconfigurations; see the main Makefile for supported names.
243154387ac9Swdenk
2432c609719bSwdenkNote: for some board special configuration names may exist; check if
2433c609719bSwdenk      additional information is available from the board vendor; for
24342729af9dSwdenk      instance, the TQM823L systems are available without (standard)
24352729af9dSwdenk      or with LCD support. You can select such additional "features"
2436c609719bSwdenk      when chosing the configuration, i. e.
2437c609719bSwdenk
24382729af9dSwdenk      make TQM823L_config
24392729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
2440c609719bSwdenk
2441c609719bSwdenk      make TQM823L_LCD_config
2442c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
2443c609719bSwdenk
2444c609719bSwdenk      etc.
2445c609719bSwdenk
2446c609719bSwdenk
2447c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
24487152b1d0Swdenkimages ready for download to / installation on your system:
2449c609719bSwdenk
2450c609719bSwdenk- "u-boot.bin" is a raw binary image
2451c609719bSwdenk- "u-boot" is an image in ELF binary format
2452c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
2453c609719bSwdenk
2454baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
2455baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
2456baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
2457baf31249SMarian Balakowicz
2458baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
2459baf31249SMarian Balakowicz
2460baf31249SMarian Balakowicz	make O=/tmp/build distclean
2461baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
2462baf31249SMarian Balakowicz	make O=/tmp/build all
2463baf31249SMarian Balakowicz
2464baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
2465baf31249SMarian Balakowicz
2466baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
2467baf31249SMarian Balakowicz	make distclean
2468baf31249SMarian Balakowicz	make NAME_config
2469baf31249SMarian Balakowicz	make all
2470baf31249SMarian Balakowicz
2471baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
2472baf31249SMarian Balakowiczvariable.
2473baf31249SMarian Balakowicz
2474c609719bSwdenk
2475c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
2476c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
2477c609719bSwdenknative "make".
2478c609719bSwdenk
2479c609719bSwdenk
2480c609719bSwdenkIf the system board that you have is not listed, then you will need
2481c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
2482c609719bSwdenksteps:
2483c609719bSwdenk
2484c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
248585ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
248685ec0bccSwdenk    entries as examples. Note that here and at many other places
24877152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
248885ec0bccSwdenk    keep this order.
2489c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
249085ec0bccSwdenk    files you need. In your board directory, you will need at least
249185ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
249285ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
249385ec0bccSwdenk    your board
2494c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
2495c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
249685ec0bccSwdenk4.  Run "make <board>_config" with your new name.
2497c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
2498c609719bSwdenk    to be installed on your target system.
249985ec0bccSwdenk6.  Debug and solve any problems that might arise.
2500c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
2501c609719bSwdenk
2502c609719bSwdenk
2503c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
2504c609719bSwdenk==============================================================
2505c609719bSwdenk
2506c609719bSwdenkIf you have modified U-Boot sources (for instance added a new	board
2507c609719bSwdenkor  support  for  new  devices,	 a new CPU, etc.) you are expected to
2508c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
2509c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
2510c609719bSwdenkofficial or latest in CVS) version of U-Boot sources.
2511c609719bSwdenk
2512c609719bSwdenkBut before you submit such a patch, please verify that	your  modifi-
2513c609719bSwdenkcation	did not break existing code. At least make sure that *ALL* of
2514c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
2515c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
2516c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You  can
25177152b1d0Swdenkselect	which  (cross)	compiler  to use by passing a `CROSS_COMPILE'
2518c609719bSwdenkenvironment variable to the script, i. e. to use the cross tools from
2519c609719bSwdenkMontaVista's Hard Hat Linux you can type
2520c609719bSwdenk
2521c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
2522c609719bSwdenk
2523c609719bSwdenkor to build on a native PowerPC system you can type
2524c609719bSwdenk
2525c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
2526c609719bSwdenk
2527baf31249SMarian BalakowiczWhen using the MAKEALL script, the default behaviour is to build U-Boot
2528baf31249SMarian Balakowiczin the source directory. This location can be changed by setting the
2529baf31249SMarian BalakowiczBUILD_DIR environment variable. Also, for each target built, the MAKEALL
2530baf31249SMarian Balakowiczscript saves two log files (<target>.ERR and <target>.MAKEALL) in the
2531baf31249SMarian Balakowicz<source dir>/LOG directory. This default location can be changed by
2532baf31249SMarian Balakowiczsetting the MAKEALL_LOGDIR environment variable. For example:
2533baf31249SMarian Balakowicz
2534baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
2535baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
2536baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
2537baf31249SMarian Balakowicz
2538baf31249SMarian BalakowiczWith the above settings build objects are saved in the /tmp/build, log
2539baf31249SMarian Balakowiczfiles are saved in the /tmp/log and the source tree remains clean during
2540baf31249SMarian Balakowiczthe whole build process.
2541baf31249SMarian Balakowicz
2542baf31249SMarian Balakowicz
2543c609719bSwdenkSee also "U-Boot Porting Guide" below.
2544c609719bSwdenk
2545c609719bSwdenk
2546c609719bSwdenkMonitor Commands - Overview:
2547c609719bSwdenk============================
2548c609719bSwdenk
2549c609719bSwdenkgo	- start application at address 'addr'
2550c609719bSwdenkrun	- run commands in an environment variable
2551c609719bSwdenkbootm	- boot application image from memory
2552c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
2553c609719bSwdenktftpboot- boot image via network using TFTP protocol
2554c609719bSwdenk	       and env variables "ipaddr" and "serverip"
2555c609719bSwdenk	       (and eventually "gatewayip")
2556c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
2557c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
2558c609719bSwdenkloads	- load S-Record file over serial line
2559c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
2560c609719bSwdenkmd	- memory display
2561c609719bSwdenkmm	- memory modify (auto-incrementing)
2562c609719bSwdenknm	- memory modify (constant address)
2563c609719bSwdenkmw	- memory write (fill)
2564c609719bSwdenkcp	- memory copy
2565c609719bSwdenkcmp	- memory compare
2566c609719bSwdenkcrc32	- checksum calculation
2567c609719bSwdenkimd	- i2c memory display
2568c609719bSwdenkimm	- i2c memory modify (auto-incrementing)
2569c609719bSwdenkinm	- i2c memory modify (constant address)
2570c609719bSwdenkimw	- i2c memory write (fill)
2571c609719bSwdenkicrc32	- i2c checksum calculation
2572c609719bSwdenkiprobe	- probe to discover valid I2C chip addresses
2573c609719bSwdenkiloop	- infinite loop on address range
2574c609719bSwdenkisdram	- print SDRAM configuration information
2575c609719bSwdenksspi	- SPI utility commands
2576c609719bSwdenkbase	- print or set address offset
2577c609719bSwdenkprintenv- print environment variables
2578c609719bSwdenksetenv	- set environment variables
2579c609719bSwdenksaveenv - save environment variables to persistent storage
2580c609719bSwdenkprotect - enable or disable FLASH write protection
2581c609719bSwdenkerase	- erase FLASH memory
2582c609719bSwdenkflinfo	- print FLASH memory information
2583c609719bSwdenkbdinfo	- print Board Info structure
2584c609719bSwdenkiminfo	- print header information for application image
2585c609719bSwdenkconinfo - print console devices and informations
2586c609719bSwdenkide	- IDE sub-system
2587c609719bSwdenkloop	- infinite loop on address range
258856523f12Swdenkloopw	- infinite write loop on address range
2589c609719bSwdenkmtest	- simple RAM test
2590c609719bSwdenkicache	- enable or disable instruction cache
2591c609719bSwdenkdcache	- enable or disable data cache
2592c609719bSwdenkreset	- Perform RESET of the CPU
2593c609719bSwdenkecho	- echo args to console
2594c609719bSwdenkversion - print monitor version
2595c609719bSwdenkhelp	- print online help
2596c609719bSwdenk?	- alias for 'help'
2597c609719bSwdenk
2598c609719bSwdenk
2599c609719bSwdenkMonitor Commands - Detailed Description:
2600c609719bSwdenk========================================
2601c609719bSwdenk
2602c609719bSwdenkTODO.
2603c609719bSwdenk
2604c609719bSwdenkFor now: just type "help <command>".
2605c609719bSwdenk
2606c609719bSwdenk
2607c609719bSwdenkEnvironment Variables:
2608c609719bSwdenk======================
2609c609719bSwdenk
2610c609719bSwdenkU-Boot supports user configuration using Environment Variables which
2611c609719bSwdenkcan be made persistent by saving to Flash memory.
2612c609719bSwdenk
2613c609719bSwdenkEnvironment Variables are set using "setenv", printed using
2614c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
2615c609719bSwdenkwithout a value can be used to delete a variable from the
2616c609719bSwdenkenvironment. As long as you don't save the environment you are
2617c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
2618c609719bSwdenkenvironment is erased by accident, a default environment is provided.
2619c609719bSwdenk
2620c609719bSwdenkSome configuration options can be set using Environment Variables:
2621c609719bSwdenk
2622c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
2623c609719bSwdenk
2624c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
2625c609719bSwdenk
2626c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
2627c609719bSwdenk
2628c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
2629c609719bSwdenk
2630c609719bSwdenk  bootfile	- Name of the image to load with TFTP
2631c609719bSwdenk
2632c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
2633c609719bSwdenk		  "bootp" will just load perform a lookup of the
2634c609719bSwdenk		  configuration from the BOOTP server, but not try to
2635c609719bSwdenk		  load any image using TFTP
2636c609719bSwdenk
2637c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
2638c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
2639c609719bSwdenk		  be automatically started (by internally calling
2640c609719bSwdenk		  "bootm")
2641c609719bSwdenk
26424a6fd34bSwdenk		  If set to "no", a standalone image passed to the
26434a6fd34bSwdenk		  "bootm" command will be copied to the load address
26444a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
26454a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
26464a6fd34bSwdenk		  data.
26474a6fd34bSwdenk
264817ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
264917ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
265017ea1177Swdenk		  mode (400kHZ). This environment variable is used in
265117ea1177Swdenk		  initialization code. So, for changes to be effective
265217ea1177Swdenk		  it must be saved and board must be reset.
265317ea1177Swdenk
2654c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
2655c609719bSwdenk		  If this variable is not set, initrd images will be
2656c609719bSwdenk		  copied to the highest possible address in RAM; this
2657c609719bSwdenk		  is usually what you want since it allows for
2658c609719bSwdenk		  maximum initrd size. If for some reason you want to
2659c609719bSwdenk		  make sure that the initrd image is loaded below the
2660c609719bSwdenk		  CFG_BOOTMAPSZ limit, you can set this environment
2661c609719bSwdenk		  variable to a value of "no" or "off" or "0".
2662c609719bSwdenk		  Alternatively, you can set it to a maximum upper
2663c609719bSwdenk		  address to use (U-Boot will still check that it
2664c609719bSwdenk		  does not overwrite the U-Boot stack and data).
2665c609719bSwdenk
2666c609719bSwdenk		  For instance, when you have a system with 16 MB
26677152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
2668c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
2669c609719bSwdenk		  the "bootargs" variable. However, now you must make
26707152b1d0Swdenk		  sure that the initrd image is placed in the first
2671c609719bSwdenk		  12 MB as well - this can be done with
2672c609719bSwdenk
2673c609719bSwdenk		  setenv initrd_high 00c00000
2674c609719bSwdenk
267538b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
267638b99261Swdenk		  indication to U-Boot that all addresses are legal
267738b99261Swdenk		  for the Linux kernel, including addresses in flash
267838b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
267938b99261Swdenk		  ramdisk at all. This may be useful to reduce the
268038b99261Swdenk		  boot time on your system, but requires that this
268138b99261Swdenk		  feature is supported by your Linux kernel.
268238b99261Swdenk
2683c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
2684c609719bSwdenk
2685c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
2686dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
2687c609719bSwdenk
2688c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
2689c609719bSwdenk
2690c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
2691c609719bSwdenk
2692c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
2693c609719bSwdenk
2694c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
2695c609719bSwdenk
2696c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
2697c609719bSwdenk
2698a3d991bdSwdenk  ethprime	- When CONFIG_NET_MULTI is enabled controls which
2699a3d991bdSwdenk		  interface is used first.
2700a3d991bdSwdenk
2701a3d991bdSwdenk  ethact	- When CONFIG_NET_MULTI is enabled controls which
2702a3d991bdSwdenk		  interface is currently active. For example you
2703a3d991bdSwdenk		  can do the following
2704a3d991bdSwdenk
2705a3d991bdSwdenk		  => setenv ethact FEC ETHERNET
2706a3d991bdSwdenk		  => ping 192.168.0.1 # traffic sent on FEC ETHERNET
2707a3d991bdSwdenk		  => setenv ethact SCC ETHERNET
2708a3d991bdSwdenk		  => ping 10.0.0.1 # traffic sent on SCC ETHERNET
2709a3d991bdSwdenk
2710e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
2711e1692577SMatthias Fuchs		  available network interfaces.
2712e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
2713e1692577SMatthias Fuchs
2714a3d991bdSwdenk   netretry	- When set to "no" each network operation will
2715a3d991bdSwdenk		  either succeed or fail without retrying.
27166e592385Swdenk		  When set to "once" the network operation will
27176e592385Swdenk		  fail when all the available network interfaces
27186e592385Swdenk		  are tried once without success.
2719a3d991bdSwdenk		  Useful on scripts which control the retry operation
2720a3d991bdSwdenk		  themselves.
2721a3d991bdSwdenk
2722a1cf027aSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- see CONFIG_IXP4XX_NPE_EXT_UCOD
2723a1cf027aSJean-Christophe PLAGNIOL-VILLARD		  if set load address for the npe microcode
2724a1cf027aSJean-Christophe PLAGNIOL-VILLARD
272528cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
2726ecb0ccd9SWolfgang Denk		  UDP source port.
2727ecb0ccd9SWolfgang Denk
272828cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
272928cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
273028cb9375SWolfgang Denk
2731a3d991bdSwdenk   vlan		- When set to a value < 4095 the traffic over
2732a3d991bdSwdenk		  ethernet is encapsulated/received over 802.1q
2733a3d991bdSwdenk		  VLAN tagged frames.
2734c609719bSwdenk
2735c609719bSwdenkThe following environment variables may be used and automatically
2736c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
2737c609719bSwdenkdepending the information provided by your boot server:
2738c609719bSwdenk
2739c609719bSwdenk  bootfile	- see above
2740c609719bSwdenk  dnsip		- IP address of your Domain Name Server
2741fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
2742c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
2743c609719bSwdenk  hostname	- Target hostname
2744c609719bSwdenk  ipaddr	- see above
2745c609719bSwdenk  netmask	- Subnet Mask
2746c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
2747c609719bSwdenk  serverip	- see above
2748c609719bSwdenk
2749c609719bSwdenk
2750c609719bSwdenkThere are two special Environment Variables:
2751c609719bSwdenk
2752c609719bSwdenk  serial#	- contains hardware identification information such
2753c609719bSwdenk		  as type string and/or serial number
2754c609719bSwdenk  ethaddr	- Ethernet address
2755c609719bSwdenk
2756c609719bSwdenkThese variables can be set only once (usually during manufacturing of
2757c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
2758c609719bSwdenkonce they have been set once.
2759c609719bSwdenk
2760c609719bSwdenk
2761c1551ea8SstroeseFurther special Environment Variables:
2762c1551ea8Sstroese
2763c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
2764c1551ea8Sstroese		  with the "version" command. This variable is
2765c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
2766c1551ea8Sstroese
2767c1551ea8Sstroese
2768c609719bSwdenkPlease note that changes to some configuration parameters may take
2769c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
2770c609719bSwdenk
2771c609719bSwdenk
2772f07771ccSwdenkCommand Line Parsing:
2773f07771ccSwdenk=====================
2774f07771ccSwdenk
2775f07771ccSwdenkThere are two different command line parsers available with U-Boot:
27767152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
2777f07771ccSwdenk
2778f07771ccSwdenkOld, simple command line parser:
2779f07771ccSwdenk--------------------------------
2780f07771ccSwdenk
2781f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
2782f07771ccSwdenk- several commands on one line, separated by ';'
2783fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
2784f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
2785f07771ccSwdenk  for example:
2786fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
2787f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
2788f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
2789f07771ccSwdenk
2790f07771ccSwdenkHush shell:
2791f07771ccSwdenk-----------
2792f07771ccSwdenk
2793f07771ccSwdenk- similar to Bourne shell, with control structures like
2794f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
2795f07771ccSwdenk  until...do...done, ...
2796f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
2797f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
2798f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
2799f07771ccSwdenk  command
2800f07771ccSwdenk
2801f07771ccSwdenkGeneral rules:
2802f07771ccSwdenk--------------
2803f07771ccSwdenk
2804f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
2805f07771ccSwdenk    command) contains several commands separated by semicolon, and
2806f07771ccSwdenk    one of these commands fails, then the remaining commands will be
2807f07771ccSwdenk    executed anyway.
2808f07771ccSwdenk
2809f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
2810f07771ccSwdenk    calling run with a list af variables as arguments), any failing
2811f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
2812f07771ccSwdenk    variables are not executed.
2813f07771ccSwdenk
2814c609719bSwdenkNote for Redundant Ethernet Interfaces:
2815c609719bSwdenk=======================================
2816c609719bSwdenk
28177152b1d0SwdenkSome boards come with redundant ethernet interfaces; U-Boot supports
2818c609719bSwdenksuch configurations and is capable of automatic selection of a
28197152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
2820c609719bSwdenk
2821c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
2822c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
2823c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
2824c609719bSwdenk
2825c609719bSwdenkIf the network interface stores some valid MAC address (for instance
2826c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
2827c609719bSwdenkding setting in the environment; if the corresponding environment
2828c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
2829c609719bSwdenk
2830c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
2831c609719bSwdenk  environment, the SROM's address is used.
2832c609719bSwdenk
2833c609719bSwdenko If there is no valid address in the SROM, and a definition in the
2834c609719bSwdenk  environment exists, then the value from the environment variable is
2835c609719bSwdenk  used.
2836c609719bSwdenk
2837c609719bSwdenko If both the SROM and the environment contain a MAC address, and
2838c609719bSwdenk  both addresses are the same, this MAC address is used.
2839c609719bSwdenk
2840c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
2841c609719bSwdenk  addresses differ, the value from the environment is used and a
2842c609719bSwdenk  warning is printed.
2843c609719bSwdenk
2844c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
2845c609719bSwdenk  is raised.
2846c609719bSwdenk
2847c609719bSwdenk
2848c609719bSwdenkImage Formats:
2849c609719bSwdenk==============
2850c609719bSwdenk
2851c609719bSwdenkThe "boot" commands of this monitor operate on "image" files which
2852c609719bSwdenkcan be basicly anything, preceeded by a special header; see the
2853c609719bSwdenkdefinitions in include/image.h for details; basicly, the header
2854c609719bSwdenkdefines the following image properties:
2855c609719bSwdenk
2856c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
2857c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
28587f70e853Swdenk  LynxOS, pSOS, QNX, RTEMS, ARTOS;
28591f4bb37dSwdenk  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS).
28607b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
28613d1e8a9dSwdenk  IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
28627b64fef3SWolfgang Denk  Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
2863c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
2864c609719bSwdenk* Load Address
2865c609719bSwdenk* Entry Point
2866c609719bSwdenk* Image Name
2867c609719bSwdenk* Image Timestamp
2868c609719bSwdenk
2869c609719bSwdenkThe header is marked by a special Magic Number, and both the header
2870c609719bSwdenkand the data portions of the image are secured against corruption by
2871c609719bSwdenkCRC32 checksums.
2872c609719bSwdenk
2873c609719bSwdenk
2874c609719bSwdenkLinux Support:
2875c609719bSwdenk==============
2876c609719bSwdenk
2877c609719bSwdenkAlthough U-Boot should support any OS or standalone application
28787152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
2879c609719bSwdenkU-Boot.
2880c609719bSwdenk
2881c609719bSwdenkU-Boot includes many features that so far have been part of some
2882c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
2883c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
2884c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
28857152b1d0Swdenkserves several purposes:
2886c609719bSwdenk
2887c609719bSwdenk- the same features can be used for other OS or standalone
2888c609719bSwdenk  applications (for instance: using compressed images to reduce the
2889c609719bSwdenk  Flash memory footprint)
2890c609719bSwdenk
2891c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
28927152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
2893c609719bSwdenk
2894c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
2895c609719bSwdenk  images; of course this also means that different kernel images can
2896c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
2897c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
2898c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
2899c609719bSwdenk  software is easier now.
2900c609719bSwdenk
2901c609719bSwdenk
2902c609719bSwdenkLinux HOWTO:
2903c609719bSwdenk============
2904c609719bSwdenk
2905c609719bSwdenkPorting Linux to U-Boot based systems:
2906c609719bSwdenk---------------------------------------
2907c609719bSwdenk
2908c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
2909c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
2910c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
2911c609719bSwdenkLinux :-).
2912c609719bSwdenk
2913c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
2914c609719bSwdenk
2915c609719bSwdenkJust make sure your machine specific header file (for instance
2916c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
2917c609719bSwdenkInformation structure as we define in include/u-boot.h, and make
2918c609719bSwdenksure that your definition of IMAP_ADDR uses the same value as your
2919c609719bSwdenkU-Boot configuration in CFG_IMMR.
2920c609719bSwdenk
2921c609719bSwdenk
2922c609719bSwdenkConfiguring the Linux kernel:
2923c609719bSwdenk-----------------------------
2924c609719bSwdenk
2925c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
2926c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
2927c609719bSwdenk
2928c609719bSwdenk
2929c609719bSwdenkBuilding a Linux Image:
2930c609719bSwdenk-----------------------
2931c609719bSwdenk
293224ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
293324ee89b9Swdenknot used. If you use recent kernel source, a new build target
293424ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
293524ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
293624ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
293724ee89b9Swdenk100% compatible format.
2938c609719bSwdenk
2939c609719bSwdenkExample:
2940c609719bSwdenk
2941c609719bSwdenk	make TQM850L_config
2942c609719bSwdenk	make oldconfig
2943c609719bSwdenk	make dep
294424ee89b9Swdenk	make uImage
2945c609719bSwdenk
294624ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
294724ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
294824ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
2949c609719bSwdenk
295024ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
295124ee89b9Swdenk
295224ee89b9Swdenk* convert the kernel into a raw binary image:
295324ee89b9Swdenk
295424ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
295524ee89b9Swdenk				 -R .note -R .comment \
295624ee89b9Swdenk				 -S vmlinux linux.bin
295724ee89b9Swdenk
295824ee89b9Swdenk* compress the binary image:
295924ee89b9Swdenk
296024ee89b9Swdenk	gzip -9 linux.bin
296124ee89b9Swdenk
296224ee89b9Swdenk* package compressed binary image for U-Boot:
296324ee89b9Swdenk
296424ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
296524ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
296624ee89b9Swdenk		-d linux.bin.gz uImage
296724ee89b9Swdenk
296824ee89b9Swdenk
296924ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
297024ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
297124ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
297224ee89b9Swdenkbyte header containing information about target architecture,
297324ee89b9Swdenkoperating system, image type, compression method, entry points, time
297424ee89b9Swdenkstamp, CRC32 checksums, etc.
297524ee89b9Swdenk
297624ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
297724ee89b9Swdenkprint the header information, or to build new images.
2978c609719bSwdenk
2979c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
2980c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
2981c609719bSwdenkchecksum verification:
2982c609719bSwdenk
2983c609719bSwdenk	tools/mkimage -l image
2984c609719bSwdenk	  -l ==> list image header information
2985c609719bSwdenk
2986c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
2987c609719bSwdenkfrom a "data file" which is used as image payload:
2988c609719bSwdenk
2989c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
2990c609719bSwdenk		      -n name -d data_file image
2991c609719bSwdenk	  -A ==> set architecture to 'arch'
2992c609719bSwdenk	  -O ==> set operating system to 'os'
2993c609719bSwdenk	  -T ==> set image type to 'type'
2994c609719bSwdenk	  -C ==> set compression type 'comp'
2995c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
2996c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
2997c609719bSwdenk	  -n ==> set image name to 'name'
2998c609719bSwdenk	  -d ==> use image data from 'datafile'
2999c609719bSwdenk
300069459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
300169459791Swdenkaddress (0x00000000), but the entry point address depends on the
300269459791Swdenkkernel version:
3003c609719bSwdenk
3004c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
300524ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
3006c609719bSwdenk
3007c609719bSwdenkSo a typical call to build a U-Boot image would read:
3008c609719bSwdenk
300924ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
301024ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
301124ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
301224ee89b9Swdenk	> examples/uImage.TQM850L
301324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3014c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3015c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3016c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3017c609719bSwdenk	Load Address: 0x00000000
301824ee89b9Swdenk	Entry Point:  0x00000000
3019c609719bSwdenk
3020c609719bSwdenkTo verify the contents of the image (or check for corruption):
3021c609719bSwdenk
302224ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
302324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3024c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3025c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3026c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3027c609719bSwdenk	Load Address: 0x00000000
302824ee89b9Swdenk	Entry Point:  0x00000000
3029c609719bSwdenk
3030c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
3031c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
3032c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
3033c609719bSwdenkneed to be uncompressed:
3034c609719bSwdenk
303524ee89b9Swdenk	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
303624ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
303724ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
303824ee89b9Swdenk	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
303924ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
304024ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3041c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3042c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
3043c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
3044c609719bSwdenk	Load Address: 0x00000000
304524ee89b9Swdenk	Entry Point:  0x00000000
3046c609719bSwdenk
3047c609719bSwdenk
3048c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
3049c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
3050c609719bSwdenk
3051c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
3052c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
3053c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3054c609719bSwdenk	Image Name:   Simple Ramdisk Image
3055c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
3056c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
3057c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
3058c609719bSwdenk	Load Address: 0x00000000
3059c609719bSwdenk	Entry Point:  0x00000000
3060c609719bSwdenk
3061c609719bSwdenk
3062c609719bSwdenkInstalling a Linux Image:
3063c609719bSwdenk-------------------------
3064c609719bSwdenk
3065c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
3066c609719bSwdenkyou must convert the image to S-Record format:
3067c609719bSwdenk
3068c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
3069c609719bSwdenk
3070c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
3071c609719bSwdenkimage header, so the resulting S-Record file will be relative to
3072c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
3073c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
3074c609719bSwdenkcommand.
3075c609719bSwdenk
3076c609719bSwdenkExample: install the image to address 0x40100000 (which on the
3077c609719bSwdenkTQM8xxL is in the first Flash bank):
3078c609719bSwdenk
3079c609719bSwdenk	=> erase 40100000 401FFFFF
3080c609719bSwdenk
3081c609719bSwdenk	.......... done
3082c609719bSwdenk	Erased 8 sectors
3083c609719bSwdenk
3084c609719bSwdenk	=> loads 40100000
3085c609719bSwdenk	## Ready for S-Record download ...
3086c609719bSwdenk	~>examples/image.srec
3087c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3088c609719bSwdenk	...
3089c609719bSwdenk	15989 15990 15991 15992
3090c609719bSwdenk	[file transfer complete]
3091c609719bSwdenk	[connected]
3092c609719bSwdenk	## Start Addr = 0x00000000
3093c609719bSwdenk
3094c609719bSwdenk
3095c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
3096c609719bSwdenkthis includes a checksum verification so you  can  be  sure  no	 data
3097c609719bSwdenkcorruption happened:
3098c609719bSwdenk
3099c609719bSwdenk	=> imi 40100000
3100c609719bSwdenk
3101c609719bSwdenk	## Checking Image at 40100000 ...
3102c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3103c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3104c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3105c609719bSwdenk	   Load Address: 00000000
3106c609719bSwdenk	   Entry Point:	 0000000c
3107c609719bSwdenk	   Verifying Checksum ... OK
3108c609719bSwdenk
3109c609719bSwdenk
3110c609719bSwdenkBoot Linux:
3111c609719bSwdenk-----------
3112c609719bSwdenk
3113c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
3114c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
3115c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
3116c609719bSwdenkparameters. You can check and modify this variable using the
3117c609719bSwdenk"printenv" and "setenv" commands:
3118c609719bSwdenk
3119c609719bSwdenk
3120c609719bSwdenk	=> printenv bootargs
3121c609719bSwdenk	bootargs=root=/dev/ram
3122c609719bSwdenk
3123c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3124c609719bSwdenk
3125c609719bSwdenk	=> printenv bootargs
3126c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3127c609719bSwdenk
3128c609719bSwdenk	=> bootm 40020000
3129c609719bSwdenk	## Booting Linux kernel at 40020000 ...
3130c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
3131c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3132c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
3133c609719bSwdenk	   Load Address: 00000000
3134c609719bSwdenk	   Entry Point:	 0000000c
3135c609719bSwdenk	   Verifying Checksum ... OK
3136c609719bSwdenk	   Uncompressing Kernel Image ... OK
3137c609719bSwdenk	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
3138c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3139c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3140c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3141c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3142c609719bSwdenk	...
3143c609719bSwdenk
3144c609719bSwdenkIf you want to boot a Linux kernel with initial ram disk, you pass
31457152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
3146c609719bSwdenkformat!) to the "bootm" command:
3147c609719bSwdenk
3148c609719bSwdenk	=> imi 40100000 40200000
3149c609719bSwdenk
3150c609719bSwdenk	## Checking Image at 40100000 ...
3151c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3152c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3153c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3154c609719bSwdenk	   Load Address: 00000000
3155c609719bSwdenk	   Entry Point:	 0000000c
3156c609719bSwdenk	   Verifying Checksum ... OK
3157c609719bSwdenk
3158c609719bSwdenk	## Checking Image at 40200000 ...
3159c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3160c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3161c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3162c609719bSwdenk	   Load Address: 00000000
3163c609719bSwdenk	   Entry Point:	 00000000
3164c609719bSwdenk	   Verifying Checksum ... OK
3165c609719bSwdenk
3166c609719bSwdenk	=> bootm 40100000 40200000
3167c609719bSwdenk	## Booting Linux kernel at 40100000 ...
3168c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3169c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3170c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3171c609719bSwdenk	   Load Address: 00000000
3172c609719bSwdenk	   Entry Point:	 0000000c
3173c609719bSwdenk	   Verifying Checksum ... OK
3174c609719bSwdenk	   Uncompressing Kernel Image ... OK
3175c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
3176c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3177c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3178c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3179c609719bSwdenk	   Load Address: 00000000
3180c609719bSwdenk	   Entry Point:	 00000000
3181c609719bSwdenk	   Verifying Checksum ... OK
3182c609719bSwdenk	   Loading Ramdisk ... OK
3183c609719bSwdenk	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
3184c609719bSwdenk	Boot arguments: root=/dev/ram
3185c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3186c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3187c609719bSwdenk	...
3188c609719bSwdenk	RAMDISK: Compressed image found at block 0
3189c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
3190c609719bSwdenk
3191c609719bSwdenk	bash#
3192c609719bSwdenk
31930267768eSMatthew McClintockBoot Linux and pass a flat device tree:
31940267768eSMatthew McClintock-----------
31950267768eSMatthew McClintock
31960267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
31970267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
31980267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
31990267768eSMatthew McClintockflat device tree:
32000267768eSMatthew McClintock
32010267768eSMatthew McClintock=> print oftaddr
32020267768eSMatthew McClintockoftaddr=0x300000
32030267768eSMatthew McClintock=> print oft
32040267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
32050267768eSMatthew McClintock=> tftp $oftaddr $oft
32060267768eSMatthew McClintockSpeed: 1000, full duplex
32070267768eSMatthew McClintockUsing TSEC0 device
32080267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
32090267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
32100267768eSMatthew McClintockLoad address: 0x300000
32110267768eSMatthew McClintockLoading: #
32120267768eSMatthew McClintockdone
32130267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
32140267768eSMatthew McClintock=> tftp $loadaddr $bootfile
32150267768eSMatthew McClintockSpeed: 1000, full duplex
32160267768eSMatthew McClintockUsing TSEC0 device
32170267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
32180267768eSMatthew McClintockFilename 'uImage'.
32190267768eSMatthew McClintockLoad address: 0x200000
32200267768eSMatthew McClintockLoading:############
32210267768eSMatthew McClintockdone
32220267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
32230267768eSMatthew McClintock=> print loadaddr
32240267768eSMatthew McClintockloadaddr=200000
32250267768eSMatthew McClintock=> print oftaddr
32260267768eSMatthew McClintockoftaddr=0x300000
32270267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
32280267768eSMatthew McClintock## Booting image at 00200000 ...
32290267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
32300267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
32310267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
32320267768eSMatthew McClintock   Load Address: 00000000
32330267768eSMatthew McClintock   Entry Point:	 00000000
32340267768eSMatthew McClintock   Verifying Checksum ... OK
32350267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
32360267768eSMatthew McClintockBooting using flat device tree at 0x300000
32370267768eSMatthew McClintockUsing MPC85xx ADS machine description
32380267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
32390267768eSMatthew McClintock[snip]
32400267768eSMatthew McClintock
32410267768eSMatthew McClintock
32426069ff26SwdenkMore About U-Boot Image Types:
32436069ff26Swdenk------------------------------
32446069ff26Swdenk
32456069ff26SwdenkU-Boot supports the following image types:
32466069ff26Swdenk
32476069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
32486069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
32496069ff26Swdenk	well) you can continue to work in U-Boot after return from
32506069ff26Swdenk	the Standalone Program.
32516069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
32526069ff26Swdenk	will take over control completely. Usually these programs
32536069ff26Swdenk	will install their own set of exception handlers, device
32546069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
32556069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
32566069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
32576069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
32586069ff26Swdenk	being started.
32596069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
32606069ff26Swdenk	(Linux) kernel image and one or more data images like
32616069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
32626069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
32636069ff26Swdenk	server provides just a single image file, but you want to get
32646069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
32656069ff26Swdenk
32666069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
32676069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
32686069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
32696069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
32706069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
32716069ff26Swdenk	a multiple of 4 bytes).
32726069ff26Swdenk
32736069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
32746069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
32756069ff26Swdenk	flash memory.
32766069ff26Swdenk
32776069ff26Swdenk   "Script files" are command sequences that will be executed by
32786069ff26Swdenk	U-Boot's command interpreter; this feature is especially
32796069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
32806069ff26Swdenk	as command interpreter.
32816069ff26Swdenk
3282c609719bSwdenk
3283c609719bSwdenkStandalone HOWTO:
3284c609719bSwdenk=================
3285c609719bSwdenk
3286c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
3287c609719bSwdenkrun "standalone" applications, which can use some resources of
3288c609719bSwdenkU-Boot like console I/O functions or interrupt services.
3289c609719bSwdenk
3290c609719bSwdenkTwo simple examples are included with the sources:
3291c609719bSwdenk
3292c609719bSwdenk"Hello World" Demo:
3293c609719bSwdenk-------------------
3294c609719bSwdenk
3295c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
3296c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
3297c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
3298c609719bSwdenklike that:
3299c609719bSwdenk
3300c609719bSwdenk	=> loads
3301c609719bSwdenk	## Ready for S-Record download ...
3302c609719bSwdenk	~>examples/hello_world.srec
3303c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
3304c609719bSwdenk	[file transfer complete]
3305c609719bSwdenk	[connected]
3306c609719bSwdenk	## Start Addr = 0x00040004
3307c609719bSwdenk
3308c609719bSwdenk	=> go 40004 Hello World! This is a test.
3309c609719bSwdenk	## Starting application at 0x00040004 ...
3310c609719bSwdenk	Hello World
3311c609719bSwdenk	argc = 7
3312c609719bSwdenk	argv[0] = "40004"
3313c609719bSwdenk	argv[1] = "Hello"
3314c609719bSwdenk	argv[2] = "World!"
3315c609719bSwdenk	argv[3] = "This"
3316c609719bSwdenk	argv[4] = "is"
3317c609719bSwdenk	argv[5] = "a"
3318c609719bSwdenk	argv[6] = "test."
3319c609719bSwdenk	argv[7] = "<NULL>"
3320c609719bSwdenk	Hit any key to exit ...
3321c609719bSwdenk
3322c609719bSwdenk	## Application terminated, rc = 0x0
3323c609719bSwdenk
3324c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
3325c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
3326c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
3327c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
3328c609719bSwdenkcharacter, but this is just a demo program. The application can be
3329c609719bSwdenkcontrolled by the following keys:
3330c609719bSwdenk
3331c609719bSwdenk	? - print current values og the CPM Timer registers
3332c609719bSwdenk	b - enable interrupts and start timer
3333c609719bSwdenk	e - stop timer and disable interrupts
3334c609719bSwdenk	q - quit application
3335c609719bSwdenk
3336c609719bSwdenk	=> loads
3337c609719bSwdenk	## Ready for S-Record download ...
3338c609719bSwdenk	~>examples/timer.srec
3339c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
3340c609719bSwdenk	[file transfer complete]
3341c609719bSwdenk	[connected]
3342c609719bSwdenk	## Start Addr = 0x00040004
3343c609719bSwdenk
3344c609719bSwdenk	=> go 40004
3345c609719bSwdenk	## Starting application at 0x00040004 ...
3346c609719bSwdenk	TIMERS=0xfff00980
3347c609719bSwdenk	Using timer 1
3348c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
3349c609719bSwdenk
3350c609719bSwdenkHit 'b':
3351c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
3352c609719bSwdenk	Enabling timer
3353c609719bSwdenkHit '?':
3354c609719bSwdenk	[q, b, e, ?] ........
3355c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3356c609719bSwdenkHit '?':
3357c609719bSwdenk	[q, b, e, ?] .
3358c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3359c609719bSwdenkHit '?':
3360c609719bSwdenk	[q, b, e, ?] .
3361c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3362c609719bSwdenkHit '?':
3363c609719bSwdenk	[q, b, e, ?] .
3364c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3365c609719bSwdenkHit 'e':
3366c609719bSwdenk	[q, b, e, ?] ...Stopping timer
3367c609719bSwdenkHit 'q':
3368c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
3369c609719bSwdenk
3370c609719bSwdenk
337185ec0bccSwdenkMinicom warning:
337285ec0bccSwdenk================
337385ec0bccSwdenk
33747152b1d0SwdenkOver time, many people have reported problems when trying to use the
337585ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
337685ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
3377f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
337885ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
337985ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
338085ec0bccSwdenk
338152f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
338252f52c14Swdenkconfiguration to your "File transfer protocols" section:
338352f52c14Swdenk
338452f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
338552f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
338652f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
338752f52c14Swdenk
338852f52c14Swdenk
3389c609719bSwdenkNetBSD Notes:
3390c609719bSwdenk=============
3391c609719bSwdenk
3392c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
3393c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
3394c609719bSwdenk
3395c609719bSwdenkBuilding requires a cross environment; it is known to work on
3396c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3397c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
3398c609719bSwdenkNote that the cross-powerpc package does not install include files;
3399c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
3400c609719bSwdenkmissing.  This file has to be installed and patched manually:
3401c609719bSwdenk
3402c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
3403c609719bSwdenk	# mkdir powerpc
3404c609719bSwdenk	# ln -s powerpc machine
3405c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3406c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
3407c609719bSwdenk
3408c609719bSwdenkNative builds *don't* work due to incompatibilities between native
3409c609719bSwdenkand U-Boot include files.
3410c609719bSwdenk
3411c609719bSwdenkBooting assumes that (the first part of) the image booted is a
3412c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
3413c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
3414c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
34152a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
3416c609719bSwdenk
3417c609719bSwdenk
3418c609719bSwdenkImplementation Internals:
3419c609719bSwdenk=========================
3420c609719bSwdenk
3421c609719bSwdenkThe following is not intended to be a complete description of every
3422c609719bSwdenkimplementation detail. However, it should help to understand the
3423c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
3424c609719bSwdenkhardware.
3425c609719bSwdenk
3426c609719bSwdenk
3427c609719bSwdenkInitial Stack, Global Data:
3428c609719bSwdenk---------------------------
3429c609719bSwdenk
3430c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
3431c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
3432c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
3433c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
3434c609719bSwdenkis not initialized as zero. To be able to get a C environment working
3435c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
3436c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
3437c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
3438c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
3439c609719bSwdenklocked as (mis-) used as memory, etc.
3440c609719bSwdenk
34417152b1d0Swdenk	Chris Hallinan posted a good summary of	 these	issues	to  the
344243d9616cSwdenk	u-boot-users mailing list:
344343d9616cSwdenk
344443d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
344543d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
344643d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
344743d9616cSwdenk	...
344843d9616cSwdenk
344943d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
345043d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
345143d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
345243d9616cSwdenk	is that the cache is being used as a temporary supply of
345343d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
345443d9616cSwdenk	beyond the scope of this list to expain the details, but you
345543d9616cSwdenk	can see how this works by studying the cache architecture and
345643d9616cSwdenk	operation in the architecture and processor-specific manuals.
345743d9616cSwdenk
345843d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
345943d9616cSwdenk	is another option for the system designer to use as an
346043d9616cSwdenk	initial stack/ram area prior to SDRAM being available. Either
346143d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
346243d9616cSwdenk	board designers haven't used it for something that would
346343d9616cSwdenk	cause you grief during the initial boot! It is frequently not
346443d9616cSwdenk	used.
346543d9616cSwdenk
346643d9616cSwdenk	CFG_INIT_RAM_ADDR should be somewhere that won't interfere
346743d9616cSwdenk	with your processor/board/system design. The default value
346843d9616cSwdenk	you will find in any recent u-boot distribution in
34698a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
347043d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
347143d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
347243d9616cSwdenk	that are supposed to respond to that address! That code in
347343d9616cSwdenk	start.S has been around a while and should work as is when
347443d9616cSwdenk	you get the config right.
347543d9616cSwdenk
347643d9616cSwdenk	-Chris Hallinan
347743d9616cSwdenk	DS4.COM, Inc.
347843d9616cSwdenk
3479c609719bSwdenkIt is essential to remember this, since it has some impact on the C
3480c609719bSwdenkcode for the initialization procedures:
3481c609719bSwdenk
3482c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
3483c609719bSwdenk  to write it.
3484c609719bSwdenk
3485c609719bSwdenk* Do not use any unitialized global data (or implicitely initialized
3486c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
34877152b1d0Swdenk  zation is performed later (when relocating to RAM).
3488c609719bSwdenk
3489c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
3490c609719bSwdenk  that.
3491c609719bSwdenk
3492c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
3493c609719bSwdenknormal global data to share information beween the code. But it
3494c609719bSwdenkturned out that the implementation of U-Boot can be greatly
3495c609719bSwdenksimplified by making a global data structure (gd_t) available to all
3496c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
3497c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
3498c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
3499c609719bSwdenkplace a pointer (gd) to the global data into a register which we
3500c609719bSwdenkreserve for this purpose.
3501c609719bSwdenk
35027152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
3503c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
3504c609719bSwdenkGCC's implementation.
3505c609719bSwdenk
3506c609719bSwdenkFor PowerPC, the following registers have specific use:
3507c609719bSwdenk	R1:	stack pointer
3508e7670f6cSWolfgang Denk	R2:	reserved for system use
3509c609719bSwdenk	R3-R4:	parameter passing and return values
3510c609719bSwdenk	R5-R10: parameter passing
3511c609719bSwdenk	R13:	small data area pointer
3512c609719bSwdenk	R30:	GOT pointer
3513c609719bSwdenk	R31:	frame pointer
3514c609719bSwdenk
3515c609719bSwdenk	(U-Boot also uses R14 as internal GOT pointer.)
3516c609719bSwdenk
3517e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
3518c609719bSwdenk
3519c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
3520c609719bSwdenk    address of the global data structure is known at compile time),
3521c609719bSwdenk    but it turned out that reserving a register results in somewhat
3522c609719bSwdenk    smaller code - although the code savings are not that big (on
3523c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
3524c609719bSwdenk    624 text + 127 data).
3525c609719bSwdenk
35264c58eb55SMike FrysingerOn Blackfin, the normal C ABI (except for P5) is followed as documented here:
35274c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
35284c58eb55SMike Frysinger
35294c58eb55SMike Frysinger    ==> U-Boot will use P5 to hold a pointer to the global data
35304c58eb55SMike Frysinger
3531c609719bSwdenkOn ARM, the following registers are used:
3532c609719bSwdenk
3533c609719bSwdenk	R0:	function argument word/integer result
3534c609719bSwdenk	R1-R3:	function argument word
3535c609719bSwdenk	R9:	GOT pointer
3536c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
3537c609719bSwdenk	R11:	argument (frame) pointer
3538c609719bSwdenk	R12:	temporary workspace
3539c609719bSwdenk	R13:	stack pointer
3540c609719bSwdenk	R14:	link register
3541c609719bSwdenk	R15:	program counter
3542c609719bSwdenk
3543c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
3544c609719bSwdenk
3545d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
3546d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
3547c609719bSwdenk
3548c609719bSwdenkMemory Management:
3549c609719bSwdenk------------------
3550c609719bSwdenk
3551c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
3552c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
3553c609719bSwdenk
3554c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
3555c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
3556c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
3557c609719bSwdenkphysical memory banks.
3558c609719bSwdenk
3559c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
3560c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
3561c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
3562c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
3563c609719bSwdenkmemory is reserved for use by malloc() [see CFG_MALLOC_LEN
3564c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
3565c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
3566c609719bSwdenk
3567c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
3568c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
3569c609719bSwdenk
3570c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
3571c609719bSwdenkthis:
3572c609719bSwdenk
3573c609719bSwdenk	0x0000 0000	Exception Vector code
3574c609719bSwdenk	      :
3575c609719bSwdenk	0x0000 1FFF
3576c609719bSwdenk	0x0000 2000	Free for Application Use
3577c609719bSwdenk	      :
3578c609719bSwdenk	      :
3579c609719bSwdenk
3580c609719bSwdenk	      :
3581c609719bSwdenk	      :
3582c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
3583c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
3584c609719bSwdenk	0x00FC 0000	Malloc Arena
3585c609719bSwdenk	      :
3586c609719bSwdenk	0x00FD FFFF
3587c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
3588c609719bSwdenk	...		eventually: LCD or video framebuffer
3589c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
3590c609719bSwdenk	0x00FF FFFF	[End of RAM]
3591c609719bSwdenk
3592c609719bSwdenk
3593c609719bSwdenkSystem Initialization:
3594c609719bSwdenk----------------------
3595c609719bSwdenk
3596c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
3597c609719bSwdenk(on most PowerPC systens at address 0x00000100). Because of the reset
3598c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
35997152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
3600c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
3601c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
3602c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
3603c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
3604c609719bSwdenkthe caches and the SIU.
3605c609719bSwdenk
3606c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
3607c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
3608c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3609c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3610c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
3611c609719bSwdenksimple memory test is run that determines the size of the SDRAM
3612c609719bSwdenkbanks.
3613c609719bSwdenk
3614c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
36157152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
3616c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
3617c609719bSwdenk0x00000000, with any additional banks following immediately to create
3618c609719bSwdenkcontiguous memory starting from 0.
3619c609719bSwdenk
3620c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
3621c609719bSwdenkand allocates memory for use by malloc() and for the global Board
3622c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
3623c609719bSwdenkpages, and the final stack is set up.
3624c609719bSwdenk
3625c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
3626c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
3627c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
3628c609719bSwdenknew address in RAM.
3629c609719bSwdenk
3630c609719bSwdenk
3631c609719bSwdenkU-Boot Porting Guide:
3632c609719bSwdenk----------------------
3633c609719bSwdenk
3634c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
36356aff3115Swdenklist, October 2002]
3636c609719bSwdenk
3637c609719bSwdenk
3638c609719bSwdenkint main (int argc, char *argv[])
3639c609719bSwdenk{
3640c609719bSwdenk	sighandler_t no_more_time;
3641c609719bSwdenk
3642c609719bSwdenk	signal (SIGALRM, no_more_time);
3643c609719bSwdenk	alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
3644c609719bSwdenk
3645c609719bSwdenk	if (available_money > available_manpower) {
3646c609719bSwdenk		pay consultant to port U-Boot;
3647c609719bSwdenk		return 0;
3648c609719bSwdenk	}
3649c609719bSwdenk
3650c609719bSwdenk	Download latest U-Boot source;
3651c609719bSwdenk
36526aff3115Swdenk	Subscribe to u-boot-users mailing list;
36536aff3115Swdenk
3654c609719bSwdenk	if (clueless) {
3655c609719bSwdenk		email ("Hi, I am new to U-Boot, how do I get started?");
3656c609719bSwdenk	}
3657c609719bSwdenk
3658c609719bSwdenk	while (learning) {
3659c609719bSwdenk		Read the README file in the top level directory;
36607cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual ;
3661c609719bSwdenk		Read the source, Luke;
3662c609719bSwdenk	}
3663c609719bSwdenk
3664c609719bSwdenk	if (available_money > toLocalCurrency ($2500)) {
3665c609719bSwdenk		Buy a BDI2000;
3666c609719bSwdenk	} else {
3667c609719bSwdenk		Add a lot of aggravation and time;
3668c609719bSwdenk	}
3669c609719bSwdenk
3670c609719bSwdenk	Create your own board support subdirectory;
3671c609719bSwdenk
36726aff3115Swdenk	Create your own board config file;
36736aff3115Swdenk
3674c609719bSwdenk	while (!running) {
3675c609719bSwdenk		do {
3676c609719bSwdenk			Add / modify source code;
3677c609719bSwdenk		} until (compiles);
3678c609719bSwdenk		Debug;
3679c609719bSwdenk		if (clueless)
3680c609719bSwdenk			email ("Hi, I am having problems...");
3681c609719bSwdenk	}
3682c609719bSwdenk	Send patch file to Wolfgang;
3683c609719bSwdenk
3684c609719bSwdenk	return 0;
3685c609719bSwdenk}
3686c609719bSwdenk
3687c609719bSwdenkvoid no_more_time (int sig)
3688c609719bSwdenk{
3689c609719bSwdenk      hire_a_guru();
3690c609719bSwdenk}
3691c609719bSwdenk
3692c609719bSwdenk
3693c609719bSwdenkCoding Standards:
3694c609719bSwdenk-----------------
3695c609719bSwdenk
3696c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
36972c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
36982c051651SDetlev Zundel"scripts/Lindent" in your Linux kernel source directory.  In sources
36992c051651SDetlev Zundeloriginating from U-Boot a style corresponding to "Lindent -pcs" (adding
37002c051651SDetlev Zundelspaces before parameters to function calls) is actually used.
3701c609719bSwdenk
37022c051651SDetlev ZundelSource files originating from a different project (for example the
37032c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
37042c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
37052c051651SDetlev Zundelsources.
37062c051651SDetlev Zundel
37072c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
37082c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
37092c051651SDetlev Zundelin your code.
3710c609719bSwdenk
3711c178d3daSwdenkPlease also stick to the following formatting rules:
3712180d3f74Swdenk- remove any trailing white space
3713180d3f74Swdenk- use TAB characters for indentation, not spaces
3714180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
3715180d3f74Swdenk- do not add more than 2 empty lines to source files
3716180d3f74Swdenk- do not add trailing empty lines to source files
3717180d3f74Swdenk
3718c609719bSwdenkSubmissions which do not conform to the standards may be returned
3719c609719bSwdenkwith a request to reformat the changes.
3720c609719bSwdenk
3721c609719bSwdenk
3722c609719bSwdenkSubmitting Patches:
3723c609719bSwdenk-------------------
3724c609719bSwdenk
3725c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
3726c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
3727c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
3728c609719bSwdenk
372990dc6704SwdenkPatches shall be sent to the u-boot-users mailing list.
3730c609719bSwdenk
3731c609719bSwdenkWhen you send a patch, please include the following information with
3732c609719bSwdenkit:
3733c609719bSwdenk
3734c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
3735c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
3736c609719bSwdenk  patch actually fixes something.
3737c609719bSwdenk
3738c609719bSwdenk* For new features: a description of the feature and your
3739c609719bSwdenk  implementation.
3740c609719bSwdenk
3741c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
3742c609719bSwdenk
3743c609719bSwdenk* For major contributions, your entry to the CREDITS file
3744c609719bSwdenk
3745c609719bSwdenk* When you add support for a new board, don't forget to add this
3746c609719bSwdenk  board to the MAKEALL script, too.
3747c609719bSwdenk
3748c609719bSwdenk* If your patch adds new configuration options, don't forget to
3749c609719bSwdenk  document these in the README file.
3750c609719bSwdenk
3751c609719bSwdenk* The patch itself. If you are accessing the CVS repository use "cvs
3752c609719bSwdenk  update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your
3753c609719bSwdenk  version of diff does not support these options, then get the latest
3754c609719bSwdenk  version of GNU diff.
3755c609719bSwdenk
37566dff5529Swdenk  The current directory when running this command shall be the top
37576dff5529Swdenk  level directory of the U-Boot source tree, or it's parent directory
37586dff5529Swdenk  (i. e. please make sure that your patch includes sufficient
37596dff5529Swdenk  directory information for the affected files).
37606dff5529Swdenk
3761c609719bSwdenk  We accept patches as plain text, MIME attachments or as uuencoded
3762c609719bSwdenk  gzipped text.
3763c609719bSwdenk
376452f52c14Swdenk* If one logical set of modifications affects or creates several
376552f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
376652f52c14Swdenk
376752f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
376852f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
376952f52c14Swdenk
377052f52c14Swdenk
3771c609719bSwdenkNotes:
3772c609719bSwdenk
3773c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
3774c609719bSwdenk  source tree and make sure that no errors or warnings are reported
3775c609719bSwdenk  for any of the boards.
3776c609719bSwdenk
3777c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
3778c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
3779c609719bSwdenk  returned with a request to re-formatting / split it.
3780c609719bSwdenk
3781c609719bSwdenk* If you modify existing code, make sure that your new code does not
3782c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
3783c609719bSwdenk  When adding new features, these should compile conditionally only
3784c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
3785c609719bSwdenk  disabled must not need more memory than the old code without your
3786c609719bSwdenk  modification.
378790dc6704Swdenk
378890dc6704Swdenk* Remember that there is a size limit of 40 kB per message on the
378990dc6704Swdenk  u-boot-users mailing list. Compression may help.
3790