Initial revision
diff --git a/doc/README.TQM8260 b/doc/README.TQM8260
new file mode 100644
index 0000000..7e03010
--- /dev/null
+++ b/doc/README.TQM8260
@@ -0,0 +1,415 @@
+
+This file contains basic information on the port of U-Boot to TQM8260.
+All the changes fit in the common U-Boot infrastructure, providing a
+new TQM8260-specific entry in makefiles. To build U-Boot for TQM8260,
+type "make TQM8260_config", edit the "include/config_TQM8260.h" file
+if necessary, then type "make".
+
+
+Common file modifications:
+--------------------------
+
+The following common files have been modified by this project:
+(starting from the ppcboot-0.9.3/ directory)
+
+MAKEALL - TQM8260 entry added
+Makefile - TQM8260_config entry added
+cpu/mpc8260/Makefile - soft_i2c.o module added
+cpu/mpc8260/ether_scc.c - TQM8260-specific definitions added, an obvious
+ bug fixed (fcr -> scr)
+cpu/mpc8260/ether_fcc.c - TQM8260-specific definitions added
+include/flash.h - added definitions for the AM29LV640D Flash chip
+
+
+New files:
+----------
+
+The following new files have been added by this project:
+(starting from the ppcboot-0.9.3/ directory)
+
+board/tqm8260/ - board-specific directory
+board/tqm8260/Makefile - board-specific makefile
+board/tqm8260/config.mk - config file
+board/tqm8260/flash.c - flash driver (for AM29LV640D)
+board/tqm8260/ppcboot.lds - linker script
+board/tqm8260/tqm8260.c - ioport and memory initialization
+cpu/mpc8260/soft_i2c.c - software i2c EEPROM driver
+include/config_TQM8260.h - main configuration file
+
+
+New configuration options:
+--------------------------
+
+CONFIG_TQM8260
+
+ Main board-specific option (should be defined for TQM8260).
+
+CONFIG_82xx_CONS_SMC1
+
+ If defined, SMC1 will be used as the console
+
+CONFIG_82xx_CONS_SMC2
+
+ If defined, SMC2 will be used as the console
+
+CFG_INIT_LOCAL_SDRAM
+
+ If defined, the SDRAM on the local bus will be initialized and
+ mapped at BR2.
+
+
+Acceptance criteria tests:
+--------------------------
+
+The following tests have been conducted to validate the port of U-Boot
+to TQM8260:
+
+1. Operation on serial console:
+
+With the CONFIG_82xx_CONS_SMC1 option defined in the main configuration file,
+the U-Boot output appeared on the serial terminal connected to COM1 as
+follows:
+
+------------------------------------------------------------------------------
+=> help
+go - start application at address 'addr'
+run - run commands in an environment variable
+bootm - boot application image from memory
+bootp - boot image via network using BootP/TFTP protocol
+tftpboot- boot image via network using TFTP protocol
+ and env variables ipaddr and serverip
+rarpboot- boot image via network using RARP/TFTP protocol
+bootd - boot default, i.e., run 'bootcmd'
+loads - load S-Record file over serial line
+loadb - load binary file over serial line (kermit mode)
+md - memory display
+mm - memory modify (auto-incrementing)
+nm - memory modify (constant address)
+mw - memory write (fill)
+cp - memory copy
+cmp - memory compare
+crc32 - checksum calculation
+base - print or set address offset
+printenv- print environment variables
+setenv - set environment variables
+saveenv - save environment variables to persistent storage
+protect - enable or disable FLASH write protection
+erase - erase FLASH memory
+flinfo - print FLASH memory information
+bdinfo - print Board Info structure
+iminfo - print header information for application image
+coninfo - print console devices and informations
+eeprom - EEPROM sub-system
+loop - infinite loop on address range
+mtest - simple RAM test
+icache - enable or disable instruction cache
+dcache - enable or disable data cache
+reset - Perform RESET of the CPU
+echo - echo args to console
+version - print monitor version
+help - print online help
+? - alias for 'help'
+=>
+------------------------------------------------------------------------------
+
+
+2. Flash driver operation
+
+The following sequence was performed to test the "flinfo" command:
+
+------------------------------------------------------------------------------
+=> flinfo
+
+Bank # 1: AMD 29LV640D (64 M, uniform sector)
+ Size: 32 MB in 128 Sectors
+ Sector Start Addresses:
+ 40000000 40040000 (RO) 40080000 400C0000 40100000
+ 40140000 40180000 401C0000 40200000 40240000
+ 40280000 402C0000 40300000 40340000 40380000
+ 403C0000 40400000 40440000 40480000 404C0000
+ 40500000 40540000 40580000 405C0000 40600000
+ 40640000 40680000 406C0000 40700000 40740000
+ 40780000 407C0000 40800000 40840000 40880000
+ 408C0000 40900000 40940000 40980000 409C0000
+ 40A00000 40A40000 40A80000 40AC0000 40B00000
+ 40B40000 40B80000 40BC0000 40C00000 40C40000
+ 40C80000 40CC0000 40D00000 40D40000 40D80000
+ 40DC0000 40E00000 40E40000 40E80000 40EC0000
+ 40F00000 40F40000 40F80000 40FC0000 41000000
+ 41040000 41080000 410C0000 41100000 41140000
+ 41180000 411C0000 41200000 41240000 41280000
+ 412C0000 41300000 41340000 41380000 413C0000
+ 41400000 41440000 41480000 414C0000 41500000
+ 41540000 41580000 415C0000 41600000 41640000
+ 41680000 416C0000 41700000 41740000 41780000
+ 417C0000 41800000 41840000 41880000 418C0000
+ 41900000 41940000 41980000 419C0000 41A00000
+ 41A40000 41A80000 41AC0000 41B00000 41B40000
+ 41B80000 41BC0000 41C00000 41C40000 41C80000
+ 41CC0000 41D00000 41D40000 41D80000 41DC0000
+ 41E00000 41E40000 41E80000 41EC0000 41F00000
+ 41F40000 41F80000 41FC0000
+=>
+------------------------------------------------------------------------------
+
+
+The following sequence was performed to test the erase command:
+
+------------------------------------------------------------------------------
+=> cp 0 40080000 10
+Copy to Flash... done
+=> erase 40080000 400bffff
+Erase Flash from 0x40080000 to 0x400bffff
+.. done
+Erased 1 sectors
+=> md 40080000
+40080000: ffffffff ffffffff ffffffff ffffffff ................
+40080010: ffffffff ffffffff ffffffff ffffffff ................
+40080020: ffffffff ffffffff ffffffff ffffffff ................
+40080030: ffffffff ffffffff ffffffff ffffffff ................
+40080040: ffffffff ffffffff ffffffff ffffffff ................
+40080050: ffffffff ffffffff ffffffff ffffffff ................
+40080060: ffffffff ffffffff ffffffff ffffffff ................
+40080070: ffffffff ffffffff ffffffff ffffffff ................
+40080080: ffffffff ffffffff ffffffff ffffffff ................
+40080090: ffffffff ffffffff ffffffff ffffffff ................
+400800a0: ffffffff ffffffff ffffffff ffffffff ................
+400800b0: ffffffff ffffffff ffffffff ffffffff ................
+400800c0: ffffffff ffffffff ffffffff ffffffff ................
+400800d0: ffffffff ffffffff ffffffff ffffffff ................
+400800e0: ffffffff ffffffff ffffffff ffffffff ................
+400800f0: ffffffff ffffffff ffffffff ffffffff ................
+=> cp 0 40080000 10
+Copy to Flash... done
+=> erase 1:2
+Erase Flash Sectors 2-2 in Bank # 1
+.. done
+=> md 40080000
+40080000: ffffffff ffffffff ffffffff ffffffff ................
+40080010: ffffffff ffffffff ffffffff ffffffff ................
+40080020: ffffffff ffffffff ffffffff ffffffff ................
+40080030: ffffffff ffffffff ffffffff ffffffff ................
+40080040: ffffffff ffffffff ffffffff ffffffff ................
+40080050: ffffffff ffffffff ffffffff ffffffff ................
+40080060: ffffffff ffffffff ffffffff ffffffff ................
+40080070: ffffffff ffffffff ffffffff ffffffff ................
+40080080: ffffffff ffffffff ffffffff ffffffff ................
+40080090: ffffffff ffffffff ffffffff ffffffff ................
+400800a0: ffffffff ffffffff ffffffff ffffffff ................
+400800b0: ffffffff ffffffff ffffffff ffffffff ................
+400800c0: ffffffff ffffffff ffffffff ffffffff ................
+400800d0: ffffffff ffffffff ffffffff ffffffff ................
+400800e0: ffffffff ffffffff ffffffff ffffffff ................
+400800f0: ffffffff ffffffff ffffffff ffffffff ................
+=> cp 0 40080000 10
+Copy to Flash... done
+=> cp 0 400c0000 10
+Copy to Flash... done
+=> erase 1:2-3
+Erase Flash Sectors 2-3 in Bank # 1
+... done
+=> md 40080000
+40080000: ffffffff ffffffff ffffffff ffffffff ................
+40080010: ffffffff ffffffff ffffffff ffffffff ................
+40080020: ffffffff ffffffff ffffffff ffffffff ................
+40080030: ffffffff ffffffff ffffffff ffffffff ................
+40080040: ffffffff ffffffff ffffffff ffffffff ................
+40080050: ffffffff ffffffff ffffffff ffffffff ................
+40080060: ffffffff ffffffff ffffffff ffffffff ................
+40080070: ffffffff ffffffff ffffffff ffffffff ................
+40080080: ffffffff ffffffff ffffffff ffffffff ................
+40080090: ffffffff ffffffff ffffffff ffffffff ................
+400800a0: ffffffff ffffffff ffffffff ffffffff ................
+400800b0: ffffffff ffffffff ffffffff ffffffff ................
+400800c0: ffffffff ffffffff ffffffff ffffffff ................
+400800d0: ffffffff ffffffff ffffffff ffffffff ................
+400800e0: ffffffff ffffffff ffffffff ffffffff ................
+400800f0: ffffffff ffffffff ffffffff ffffffff ................
+=> md 400c0000
+400c0000: ffffffff ffffffff ffffffff ffffffff ................
+400c0010: ffffffff ffffffff ffffffff ffffffff ................
+400c0020: ffffffff ffffffff ffffffff ffffffff ................
+400c0030: ffffffff ffffffff ffffffff ffffffff ................
+400c0040: ffffffff ffffffff ffffffff ffffffff ................
+400c0050: ffffffff ffffffff ffffffff ffffffff ................
+400c0060: ffffffff ffffffff ffffffff ffffffff ................
+400c0070: ffffffff ffffffff ffffffff ffffffff ................
+400c0080: ffffffff ffffffff ffffffff ffffffff ................
+400c0090: ffffffff ffffffff ffffffff ffffffff ................
+400c00a0: ffffffff ffffffff ffffffff ffffffff ................
+400c00b0: ffffffff ffffffff ffffffff ffffffff ................
+400c00c0: ffffffff ffffffff ffffffff ffffffff ................
+400c00d0: ffffffff ffffffff ffffffff ffffffff ................
+400c00e0: ffffffff ffffffff ffffffff ffffffff ................
+400c00f0: ffffffff ffffffff ffffffff ffffffff ................
+=>
+------------------------------------------------------------------------------
+
+
+The following sequence was performed to test the Flash programming commands:
+
+------------------------------------------------------------------------------
+=> erase 40080000 400bffff
+Erase Flash from 0x40080000 to 0x400bffff
+.. done
+Erased 1 sectors
+=> cp 0 40080000 10
+Copy to Flash... done
+=> md 0
+00000000: 00000000 00000104 61100200 01000000 ........a.......
+00000010: 00000000 00000000 81140000 82000100 ................
+00000020: 01080000 00004000 22800000 00000600 ......@.".......
+00000030: 00200800 00000000 10000100 00008000 . ..............
+00000040: 00812000 00000200 00020000 80000000 .. .............
+00000050: 00028001 00001000 00040400 00000200 ................
+00000060: 20480000 00000000 20090000 00142000 H...... ..... .
+00000070: 00000000 00004000 24210000 10000000 ......@.$!......
+00000080: 02440002 10000000 00200008 00000000 .D....... ......
+00000090: 02440900 00000000 30a40000 00004400 .D......0.....D.
+000000a0: 04420800 00000000 00000040 00020000 .B.........@....
+000000b0: 05020000 00100000 00060000 00000000 ................
+000000c0: 00400000 00000000 00080000 00040000 .@..............
+000000d0: 10400000 00800004 00000000 00000200 .@..............
+000000e0: 80890000 00010004 00080000 00000020 ...............
+000000f0: 08000000 10000000 00010000 00000000 ................
+=> md 40080000
+40080000: 00000000 00000104 61100200 01000000 ........a.......
+40080010: 00000000 00000000 81140000 82000100 ................
+40080020: 01080000 00004000 22800000 00000600 ......@.".......
+40080030: 00200800 00000000 10000100 00008000 . ..............
+40080040: ffffffff ffffffff ffffffff ffffffff ................
+40080050: ffffffff ffffffff ffffffff ffffffff ................
+40080060: ffffffff ffffffff ffffffff ffffffff ................
+40080070: ffffffff ffffffff ffffffff ffffffff ................
+40080080: ffffffff ffffffff ffffffff ffffffff ................
+40080090: ffffffff ffffffff ffffffff ffffffff ................
+400800a0: ffffffff ffffffff ffffffff ffffffff ................
+400800b0: ffffffff ffffffff ffffffff ffffffff ................
+400800c0: ffffffff ffffffff ffffffff ffffffff ................
+400800d0: ffffffff ffffffff ffffffff ffffffff ................
+400800e0: ffffffff ffffffff ffffffff ffffffff ................
+400800f0: ffffffff ffffffff ffffffff ffffffff ................
+=>
+------------------------------------------------------------------------------
+
+
+The following sequence was performed to test storage of the environment
+variables in Flash:
+
+------------------------------------------------------------------------------
+=> setenv foo bar
+=> saveenv
+Un-Protected 1 sectors
+Erasing Flash...
+.. done
+Erased 1 sectors
+Saving Environment to Flash...
+Protected 1 sectors
+=> reset
+...
+=> printenv
+bootdelay=CONFIG_BOOTDELAY
+baudrate=9600
+ipaddr=192.168.4.7
+serverip=192.168.4.1
+ethaddr=66:55:44:33:22:11
+foo=bar
+stdin=serial
+stdout=serial
+stderr=serial
+
+Environment size: 170/262140 bytes
+=>
+------------------------------------------------------------------------------
+
+
+The following sequence was performed to test image download and run over
+Ethernet interface (both interfaces were tested):
+
+------------------------------------------------------------------------------
+=> tftpboot 40000 hello_world.bin
+ARP broadcast 1
+TFTP from server 192.168.2.2; our IP address is 192.168.2.7
+Filename 'hello_world.bin'.
+Load address: 0x40000
+Loading: #############
+done
+Bytes transferred = 65912 (10178 hex)
+=> go 40004
+## Starting application at 0x00040004 ...
+Hello World
+argc = 1
+argv[0] = "40004"
+argv[1] = "<NULL>"
+Hit any key to exit ...
+
+## Application terminated, rc = 0x0
+=>
+------------------------------------------------------------------------------
+
+
+The following sequence was performed to test eeprom read/write commands:
+
+------------------------------------------------------------------------------
+=> md 40000
+00040000: 00018148 9421ffe0 7c0802a6 bf61000c ...H.!..|....a..
+00040010: 90010024 48000005 7fc802a6 801effe8 ...$H...........
+00040020: 7fc0f214 7c7f1b78 813f004c 7c9c2378 ....|..x.?.L|.#x
+00040030: 807e8000 7cbd2b78 80090010 3b600000 .~..|.+x....;`..
+00040040: 7c0803a6 4e800021 813f004c 7f84e378 |...N..!.?.L...x
+00040050: 807e8004 80090010 7c0803a6 4e800021 .~......|...N..!
+00040060: 7c1be000 4181003c 80bd0000 813f004c |...A..<.....?.L
+00040070: 3bbd0004 2c050000 40820008 80be8008 ;...,...@.......
+00040080: 80090010 7f64db78 807e800c 3b7b0001 .....d.x.~..;{..
+00040090: 7c0803a6 4e800021 7c1be000 4081ffcc |...N..!|...@...
+000400a0: 813f004c 807e8010 80090010 7c0803a6 .?.L.~......|...
+000400b0: 4e800021 813f004c 80090004 7c0803a6 N..!.?.L....|...
+000400c0: 4e800021 2c030000 4182ffec 813f004c N..!,...A....?.L
+000400d0: 80090000 7c0803a6 4e800021 813f004c ....|...N..!.?.L
+000400e0: 807e8014 80090010 7c0803a6 4e800021 .~......|...N..!
+000400f0: 38600000 80010024 7c0803a6 bb61000c 8`.....$|....a..
+=> eeprom write 40000 0 40
+
+EEPROM write: addr 00040000 off 0000 count 64 ... done
+=> mw 50000 0 1000
+=> eeprom read 50000 0 40
+
+EEPROM read: addr 00050000 off 0000 count 64 ... done
+=> md 50000
+00050000: 00018148 9421ffe0 7c0802a6 bf61000c ...H.!..|....a..
+00050010: 90010024 48000005 7fc802a6 801effe8 ...$H...........
+00050020: 7fc0f214 7c7f1b78 813f004c 7c9c2378 ....|..x.?.L|.#x
+00050030: 807e8000 7cbd2b78 80090010 3b600000 .~..|.+x....;`..
+00050040: 00000000 00000000 00000000 00000000 ................
+00050050: 00000000 00000000 00000000 00000000 ................
+00050060: 00000000 00000000 00000000 00000000 ................
+00050070: 00000000 00000000 00000000 00000000 ................
+00050080: 00000000 00000000 00000000 00000000 ................
+00050090: 00000000 00000000 00000000 00000000 ................
+000500a0: 00000000 00000000 00000000 00000000 ................
+000500b0: 00000000 00000000 00000000 00000000 ................
+000500c0: 00000000 00000000 00000000 00000000 ................
+000500d0: 00000000 00000000 00000000 00000000 ................
+000500e0: 00000000 00000000 00000000 00000000 ................
+000500f0: 00000000 00000000 00000000 00000000 ................
+=>
+------------------------------------------------------------------------------
+
+
+Patch per Mon, 06 Aug 2001 17:57:27:
+
+- upgraded Flash support (added support for the following chips:
+ AM29LV800T/B, AM29LV160T/B, AM29DL322T/B, AM29DL323T/B)
+- BCR tweakage for the 8260 bus mode
+- SIUMCR tweakage enabling the MI interrupt (IRQ7)
+
+To simplify switching between the bus modes, a new configuration
+option (CONFIG_BUSMODE_60x) has been added to the "config_TQM8260.h"
+file. If it is defined, BCR will be configured for the 60x mode,
+otherwise - for the 8260 mode.
+
+Concerning the SIUMCR modification: it's hard to predict whether it
+will induce any problems on the other (60x mode) board. However, the
+problems (if they appear) should be easy to notice - if the board
+does not boot, it's most likely caused by the DPPC configuration in
+SIUMCR.
diff --git a/doc/README.bedbug b/doc/README.bedbug
new file mode 100644
index 0000000..ed7bc12
--- /dev/null
+++ b/doc/README.bedbug
@@ -0,0 +1,89 @@
+BEDBUG Support for U-Boot
+--------------------------
+
+These changes implement the bedbug (emBEDded deBUGger) debugger in U-Boot.
+A specific implementation is made for the IBM405 processor but other flavors
+can be easily implemented.
+
+#####################
+### Modifications ###
+#####################
+
+./common/Makefile
+ Included cmd_bedbug.c and bedbug.c in the Makefile.
+
+./common/command.c
+ Added bedbug commands to command table.
+
+./common/board.c
+ Added call to initialize debugger on startup.
+
+./cpu/ppc4xx/Makefile
+ Added bedbug_405.c to the Makefile.
+
+./cpu/ppc4xx/start.S
+ Added code to handle the debug exception (0x2000) on the 405.
+ Also added code to handle critical exceptions since the debug
+ is treated as critical on the 405.
+
+./cpu/ppc4xx/traps.c
+ Added more detailed output for the program exception to tell
+ if it is an illegal instruction, privileged instruction or
+ a trap. Also added debug trap handler.
+
+./include/cmd_confdefs.h
+ Added definition of CFG_CMD_BEDBUG.
+
+./include/config_WALNUT405.h
+ Added CFG_CMD_BEDBUG to the CONFIG_COMMANDS for the WALNUT.
+
+./include/ppc_asm.tmpl
+ Added code to handle critical exceptions
+
+#################
+### New Stuff ###
+#################
+
+./include/bedbug/ppc.h
+./include/bedbug/regs.h
+./include/bedbug/bedbug.h
+./include/bedbug/elf.h [obsoleted by new include/elf.h]
+./include/bedbug/tables.h
+./include/cmd_bedbug.h
+./common/cmd_bedbug.c
+./common/bedbug.c
+ Bedbug library includes code for assembling and disassembling
+ PowerPC instructions to/from memory as well as handling
+ hardware breakpoints and stepping through code. These
+ routines are common to all PowerPC processors.
+
+./cpu/ppc4xx/bedbug_405.c
+ IBM PPC405 specific debugger routines.
+
+
+
+Bedbug support for the MPC860
+-----------------------------
+
+Changes:
+
+ common/cmd_bedbug.c
+ Added call to initialize 860 debugger.
+
+ cpu/mpc8xx/Makefile
+ Added new file "bedbug_860.c" to the makefile
+
+ cpu/mpc8xx/start.S
+ Added handler for InstructionBreakpoint (0xfd00)
+
+ cpu/mpc8xx/traps.c
+ Added new routine DebugException()
+
+ include/config_MBX.h
+ Added CFG_CMD_BEDBUG to CONFIG_COMMANDS define
+
+
+New Files:
+
+ cpu/mpc8xx/bedbug_860.c
+ CPU-specific routines for 860 debug registers.
diff --git a/doc/README.evb64260 b/doc/README.evb64260
new file mode 100644
index 0000000..74211de
--- /dev/null
+++ b/doc/README.evb64260
@@ -0,0 +1,54 @@
+This file contains status information for the port of U-Boot to the
+Galileo Evaluation Board.
+
+Author: Josh Huber <huber@mclx.com>
+ Mission Critical Linux, Inc.
+
+The support for the Galileo Evaluation board is fairly minimal now.
+It's sufficient to boot Linux, but doesn't provide too much more than
+what's required to do this.
+
+Both DUART channels are supported (to use the second one, you have to
+modify the board -- see the schematics for where to solder on the
+devices module). The ethernet ports are supported, and the MPSC is
+supported as a console driver. (keep in mind that the kernel has no
+support for this yet)
+
+There are still occaisonal lockups with the MPSC console driver due to
+(we think!) overrun problems. If you're looking for something stable
+to use for Linux development, consider sticking with the DUART console
+for now.
+
+Automatic memory sizing mostly works. We've had problems with some
+combinations of memory. Please send us email if you're having trouble
+with respect to the memory detection.
+
+Right now, only the 512k boot flash is supported. Support for the
+16MB flash on the devices module is forthcoming. Right now the flash
+is stored at the 256k boundry in flash, wasting a whole sector (64k!)
+for environment data. This isn't really a big deal since we're not
+using the 512k for anything else. (Just U-Boot and the environment)
+
+Finally, here is a sample output session:
+
+U-Boot 1.0.0-pre1 (Jun 6 2001 - 12:45:11)
+
+Initializing...
+ CPU: MPC7400 (altivec enabled) v2.9
+ Board: EVB64260
+ DRAM: 256 MB
+ FLASH: 512 kB
+ In: serial
+ Out: serial
+ Err: serial
+
+=>
+
+The default configuration should be correct for the evaluation board,
+as it's shipped from Galileo. Keep in mind that the default baudrate
+is set to 38400, 8N1.
+
+Good luck, and make sure to send any bugreports to us (or the
+u-boot-users list).
+
+Josh
diff --git a/doc/README.mpc74xx b/doc/README.mpc74xx
new file mode 100644
index 0000000..f81f1c2
--- /dev/null
+++ b/doc/README.mpc74xx
@@ -0,0 +1,22 @@
+This file contains status information for the port of U-Boot to the
+Motorola mpc74xx series of CPUs.
+
+Author: Josh Huber <huber@mclx.com>
+ Mission Critical Linux, Inc.
+
+Currently the support for these CPUs is pretty minimal, but enough to
+get things going. (much like the support for the Galileo Eval Board)
+
+There is a framework in place to enable the L2 cache, and to program
+the BATs. Currently, there are still problems with the code which
+sets up the L2 cache, so it's not enabled. (IMHO, it shouldn't be
+anyway). Additionally, there is support for enabling the MMU, which
+we also don't do. The BATs are programmed just for the benefit of
+jumping into Linux in a sane configuration.
+
+Most of the code was based on other cpus supported by U-Boot.
+
+If you find any errors in the CPU setup code, please send us a note.
+
+Thanks,
+Josh
diff --git a/doc/README.usb b/doc/README.usb
new file mode 100644
index 0000000..41f76f4
--- /dev/null
+++ b/doc/README.usb
@@ -0,0 +1,80 @@
+/*
+ * (C) Copyright 2001
+ * Denis Peter, MPL AG Switzerland
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+USB Support for PIP405 and MIP405 (UHCI)
+========================================
+
+The USB support is implemented on the base of the UHCI Host
+controller.
+
+Currently supported are USB Hubs, USB Keyboards and USB Floppys.
+Tested with a TEAC Floppy TEAC FD-05PUB and Chicony KU-8933 Keyboard.
+
+How it works:
+-------------
+
+The USB (at least the USB UHCI) needs a frame list (4k), transfer
+descripor and queue headers which are all located in the main memory.
+The UHCI allocates every milisecond the PCI bus and reads the current
+frame pointer. This may cause to crash the OS during boot. So the USB
+_MUST_ be stopped during OS boot. This is the reason, why the USB is
+NOT automatically started during start-up. If someone needs the USB
+he has to start it and should therefore be aware that he had to stop
+it before booting the OS.
+
+For USB keyboards this can be done by a script which is automatically
+started after the U-Boot is up and running. To boot an OS with a an
+USB keyboard another script is necessary, which first disables the
+USB and then executes the boot command. If the boot command fails,
+the script can reenable the USB kbd.
+
+Common USB Commands:
+- usb start:
+- usb reset: (re)starts the USB. All USB devices will be
+ initialized and a device tree is build for them.
+- usb tree: shows all USB devices in a tree like display
+- usb info [dev]: shows all USB infos of the device dev, or of all
+ the devices
+- usb stop [f]: stops the USB. If f==1 the USB will also stop if
+ an USB keyboard is assigned as stdin. The stdin
+ is then switched to serial input.
+Storage USB Commands:
+- usb scan: scans the USB for storage devices.The USB must be
+ running for this command (usb start)
+- usb device [dev]: show or set current USB staorage device
+- usb part [dev]: print partition table of one or all USB storage
+ devices
+- usb read addr blk# cnt:
+ read `cnt' blocks starting at block `blk#'to
+ memory address `addr'
+- usbboot addr dev:part:
+ boot from USB device
+
+Config Switches:
+----------------
+CFG_CMD_USB enables basic USB support and the usb command
+CONFIG_USB_UHCI defines the lowlevel part.A lowlevel part must be defined if
+ using CFG_CMD_USB
+CONFIG_USB_KEYBOARD enables the USB Keyboard
+CONFIG_USB_STORAGE enables the USB storage devices