[coreboot] Serengeti VGA

[Myles Watson]

I've been trying to make the configuration spaces match between v2 and v3.
The biggest difference left is the disabled/hidden devices which are not
hidden in v3.

Any chance that's causing the problem?

I've also been trying to figure out where the legacy IO space (e.g. 0x3d4)
gets routed to the card.  Does this happen automatically because the VGA bit
is set in the bridge?

Thanks,
Myles