[coreboot] VGA ROM hang, May be a bug of the coreboot V2

Kevin O'Connor kevin at koconnor.net
Thu Mar 12 04:44:47 CET 2009

On Thu, Mar 12, 2009 at 03:24:25AM +0000, wei yang wrote:
> I currently use the coreboot v2 -3290 version.(very new).  When I
> boot the corboot V2 on the intel/Truxon board, the serial port
> without VGA is ok.  Then, I tried to add the VGA add-on card, the
> coreboot hung in the VGA ROM.  After hard debug, I found this VGA
> OPTION ROM will check a flag in the address 0xffffe, in coreboot the
> value is 0x0.  So the OptionROM go to the wrong path and do the
> infinite loop.

You can turn off option rom execution in coreboot, and have SeaBIOS
run the option roms.

> Actually, this addr in the legacy bios will put the System Mode ID
> (0xFC) in it, I manually wrote 0xFC to the address 0xfffffe.  The
> VGA ROM was ok and the screen was trun on.

SeaBIOS will have this set properly.


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