This is achieved by building an
boot ROM image for the
NE2000 compatible NIC (as used in the PPC55).
With the help of a small C program supplied below, it is possible to patch
the PPC55S BIOS image to overwrite the Netbios boot rom portion with the
etherboot equivalent. After this has been achieved, the normal AMIFLASH.COM
utility can be used to flash the modified BIOS into the PPC. Follow the
standard instructions for performing this task, substituting the new BIOS
image in place of the standard one.
An already patched BIOS version "PCM-3865 A1.01 CSTN-A1.05 4/2/1997" for the PPC55S is available below.
WARNING: This process can potentially leave you with a corrupted BIOS image in the PPC55, it will require specialist hardware to restore operation of the PPC55. If you are not sure about what you are doing, or do not have the facilities to restore your BIOS manually, I strongly suggest you do not proceed.
See the RedHat EDK documentation for details of how to set up a linux host as a TFTP/NFS server to boot the PPC55 from. A bootable runtime filesystem is also available.
The BIOS ROM is labelled: VGA: IBM VGA Compatible BIOS. Sharp LM64C142 DSTN COLOR LCD (FP only) 8/14/1996 CHIPS 65545 VGA 32KB BIOS Version 2.7.5 DECOMPILATION OR DISASSEMBLY PROHIBITED Copyright (C) 1995 Chips and Technologies, Inc. All Rights Reserved. System: AMIBIOS (c)1996 PCM-3865 A1.01 CSTN BIOS-A1.05 4/2/1997 AMIBIOS Date: 07/15/95 Etherboot: Etherboot/32 version 4.5.6 (GPL)