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DFI CW35-L, Wrong Bios
Posted: Thu Sep 19, 2002 7:44 pm
by th
Ok here is the situation:
I got hold of a DFI CW35-L, i810 chipset, soldered FWH (Grrr).
Someone (not me, I swear) flashed a Bios from a MSI, i810 based board in it.
Both Bios versions are Award 6.00.
The Board starts, but hangs right after CPU detection.
Booting not possible.
Does someone know, how to force boot block on an Award 6.00 Bios?
Bye
Thomas
Posted: Thu Sep 19, 2002 7:58 pm
by Rainbow
FWH? That's bad - there are no address pins to short
Posted: Thu Sep 19, 2002 8:47 pm
by NickS
I suppose it must be possible to build an address decoder that you could set to force the data bus to all low on an address or range of addresses in the EEPROM, causing a checksum error? (not necessarily on the flash chip itself)
Posted: Thu Sep 19, 2002 9:03 pm
by Rainbow
Or cause FWH chip reset at the right time - when the boot block reads compressed BIOS from FWH. This would require the slowest CPU and a lot of luck.
Posted: Thu Sep 19, 2002 9:39 pm
by NickS
I think I'd better explain that I don't know why the FWH doesn't have an address bus to short, and go away to read the data sheet.....
.....ah, right. Sort of serial/parallel EEPROM stylee...or not, as the A/A mux mode doesn't look too far from ordinary EPROM mode, 11 address and 8 data lines.
Posted: Fri Sep 20, 2002 12:20 am
by Rainbow
The chip is in FWH mode when placed on mothebroard. The pseudo-parallel mode is only for external programming (selected by one of the pins).
Posted: Fri Sep 20, 2002 9:42 am
by th
I forgot to say, I even tried known flaky ram, didn't work out.
Looks like we have de-soldering job here then, sigh.
Thanks for all the input.
Bye
Thomas
