mirror of
https://github.com/brain-hackers/u-boot-brain
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75 lines
2.1 KiB
Plaintext
75 lines
2.1 KiB
Plaintext
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This is my attempt to port PPCBoot to the i386 platform. This
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work was sponsored by my emplyer, Omicron Ceti AB. http://www.omicron.se
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It is currently capable of booting a linux bzImage from flash on
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the AMD SC520 CDP platform.
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It was originally based on PPCBoot taken from the CVS October 28 2002.
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To compile:
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1) Unpack the source tree, either from the complete tarball or
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from the virgin snapshot + the patch
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2) Configure the source
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$ make sc520_cdp_comfig
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$ make
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To use this code on the CDP:
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1) Make a suitable kernel, I used 2.4.19 with the mtd-support updated
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from the MTD CVS and a patch to allow root=/dev/mtdblock1 which I
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included at the end of this file.
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The following options in the MTD section might be useful:
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CONFIG_MTD_PHYSMAP=y
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CONFIG_MTD_PHYSMAP_START=38100000
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CONFIG_MTD_PHYSMAP_LEN=7a0000
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CONFIG_MTD_PHYSMAP_BUSWIDTH=2
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2) Program it in to the CDP flashbank with remon
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ppcboot.bin should be programmed att offset 0x7e000 and the kernel at
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offset 0. If you want to use a jffs2 root file system (not included here),
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it should be programmed to offset 0x100000.
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remon> z
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remon> yi
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remon> ns ppcboot.bin 7e0000
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remon> ns bzImage 0
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remon> ns image.jffs2 100000
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3) Connect a terminal to the 25pin serial port at 9600bps, and start the CDP.
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remon> z
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remon> g
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4) PPCboot should output some message and a prompt on the terminal, to
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start the kernel issue the following command:
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BOOT> bootm
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5) The kernel should boot, and mount the root filesystem if present.
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We hope you find this stuff useful
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Daniel Engstr<74>m, Omicron Ceti AB, daniel@omicron.se
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--- linux-2.4.19-orig/init/do_mounts.c Sat Aug 3 02:39:46 2002
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+++ linux-2.4.19/init/do_mounts.c Mon Sep 23 16:21:33 2002
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@@ -224,6 +224,14 @@
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{ "ftlc", 0x2c10 },
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{ "ftld", 0x2c18 },
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{ "mtdblock", 0x1f00 },
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+ { "mtdblock0", 0x1f00 },
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+ { "mtdblock1", 0x1f01 },
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+ { "mtdblock2", 0x1f02 },
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+ { "mtdblock3", 0x1f03 },
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+ { "mtdblock4", 0x1f04 },
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+ { "mtdblock5", 0x1f05 },
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+ { "mtdblock6", 0x1f06 },
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+ { "mtdblock7", 0x1f07 },
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{ NULL, 0 }
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};
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