Sun Ultra 40 M2 - VGA Card Option Rom not detected

[Nick]

Hi guys,

I just got coreboot with SeaBIOS payload up and running on a previously
unsupported system. The system is a Sun Ultra 40 M2 which is very similar
to the NVIDIA l1_2pvv development board (which already has a coreboot port.)

Coreboot detects the VGA card and outputs the text "found VGA at PCI:
43:00.0", however, SeaBIOS does not seem to be able to detect the VGA card
and doesn't seem to enumerate that bus. It would appear that the option rom
is not being ran.

Here's a simple diagram showing roughly how devices are connected on the
board: http://ibin.co/20n6DtSrgZSv

Here's the console output (SeaBIOS log level 8):
http://pastebin.com/jKu21dTV

SeaBIOS also detects USB mass storage and hard disk drives, but can not
boot from them. There's a HALT statement and a bunch of errors (also seen
in the log file.) The boot device was a USB mass storage device with linux
installed and boots successfully with the vendor bios.

Thanks in advance!

-Nick