[SeaBIOS] SeaBIOS hang with VGA option ROM

[Timothy Pearson]

All,

I have a board here that uses an XGI Volari Z9s integrated graphics 
device.  The board boots under coreboot and loads Linux, but if I add 
the appropriate VGA option ROM (extracted from the vendor BIOS) SeaBIOS 
hangs:

SeaBIOS (version rel-1.7.5-150-g301dd09-20150126_124858-apollo)
Found mainboard ASUS KFSN4-DRE
Relocating init from 0x000e6fe0 to 0x3ff95800 (size 42816)
Found CBFS header at 0xfffffc80
CPU Mhz=2311
Found 26 PCI devices (max PCI bus is 05)
Copying MPTABLE from 0x3ffe0400/3ffe0410 to 0x000f1550
Copying ACPI RSDP from 0x3ffe1400 to 0x000f1520
Copying SMBIOS entry point from 0x3ffec800 to 0x000f1500
Using pmtimer, ioport 0x2008
Scan for VGA option rom
Running option rom at c000:0003

The Volari graphics initialise and work properly once Linux has booted 
and loaded the appropriate device drivers.  For now I have been using 
SGABIOS for VGA emulation, however I would like to see the native VGA 
work on boot.

Any ideas?

Thanks!

-- 
Timothy Pearson
Raptor Engineering
+1 (415) 727-8645
http://www.raptorengineeringinc.com