The README files are totally out-of-date to the point where they do more harm than good Signed-off-by: Graeme Russ <graeme.russ@gmail.com>master
Graeme Russ
14 years ago
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This is my attempt to port U-Boot to the x86 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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u-boot.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 u-boot.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) U-Boot 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 Engström, 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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------------------- |
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@ -1,29 +0,0 @@ |
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i386 port missing features: |
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* i386 cleaness (wbinvld is 486+ ... ) |
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* Pentium TSC timer/udelay |
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* setup the BIOS data area and BIOS equipment word to reflect machine config. |
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* Make reset work (from Linux and from the boot prompt) |
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* DMA, FDC, RTC, KBC initialization |
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* split of part of arch/i386/cpu/interrupt.c to cpu/i385/entry.c? |
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* re-entry of protected mode from real mode, should be added to realmode_switch.S |
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(and used by INT 10h and INT 16h handlers for console I/O during early |
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linux boot...) |
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* missing functions in arch/i386/lib and arch/i386/cpu |
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* speaker beep interface |
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SC520 missing features: |
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* Watchdog |
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* SC520 timer/udelay |
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* SC520 3rd PIC |
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* SC520 ICE serial |
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* SC520 MMCR reset |
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SC520 CDP board support missing features: |
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* environment in sram |
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SC520 CDP board support bugs: |
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* SPI EEPROM support does not work |
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* 0x680 LEDS dos not work for me |
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* is it possible to make both the internal serial ports and the |
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ports on the sio work at the same time? |
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