uboot-vybrid_public/doc/README-i386

This is my attempt to port PPCBoot to the i386 platform. This
work was sponsored by my emplyer, Omicron Ceti AB. http://www.omicron.se

It is currently capable of booting a linux bzImage from flash on
the AMD SC520 CDP platform.

It was originally based on PPCBoot taken from the CVS October 28 2002.  

To compile:

1) Unpack the source tree, either from the complete tarball or
   from the virgin snapshot + the patch
   
2) Configure the source
   $ make sc520_cdp_comfig
   $ make
   
To use this code on the CDP:
1) Make a suitable kernel, I used 2.4.19 with the mtd-support updated
   from the MTD CVS and a patch to allow root=/dev/mtdblock1 which I
   included at the end of this file. 
   The following options in the MTD section might be useful:
   
   CONFIG_MTD_PHYSMAP=y
   CONFIG_MTD_PHYSMAP_START=38100000
   CONFIG_MTD_PHYSMAP_LEN=7a0000
   CONFIG_MTD_PHYSMAP_BUSWIDTH=2


2) Program it in to the CDP flashbank with remon
   ppcboot.bin should be programmed att offset 0x7e000 and the kernel at
   offset 0. If you want to use a jffs2 root file system (not included here), 
   it should be  programmed to offset 0x100000.
   
   remon> z
   remon> yi
   remon> ns ppcboot.bin 7e0000
   remon> ns bzImage 0
   remon> ns image.jffs2 100000

3) Connect a terminal to the 25pin serial port at 9600bps, and start the CDP.
   
   remon> z
   remon> g

4) PPCboot should output some message and a prompt on the terminal, to
   start the kernel issue the following command:
   
   BOOT> bootm
   
5) The kernel should boot, and mount the root filesystem if present.

We hope you find this stuff useful
Daniel Engström, Omicron Ceti AB, daniel@omicron.se



--- linux-2.4.19-orig/init/do_mounts.c	Sat Aug  3 02:39:46 2002
+++ linux-2.4.19/init/do_mounts.c	Mon Sep 23 16:21:33 2002
@@ -224,6 +224,14 @@
 	{ "ftlc", 0x2c10 },
 	{ "ftld", 0x2c18 },
 	{ "mtdblock", 0x1f00 },
+	{ "mtdblock0", 0x1f00 },
+	{ "mtdblock1", 0x1f01 },
+	{ "mtdblock2", 0x1f02 },
+	{ "mtdblock3", 0x1f03 },
+	{ "mtdblock4", 0x1f04 },
+	{ "mtdblock5", 0x1f05 },
+	{ "mtdblock6", 0x1f06 },
+	{ "mtdblock7", 0x1f07 },
 	{ NULL, 0 }
 };