[coreboot] Serengeti VGA

Myles Watson mylesgw at gmail.com
Mon Oct 20 21:56:09 CEST 2008

On Mon, Oct 20, 2008 at 1:48 PM, Marc Jones <Marc.Jones at amd.com> wrote:

> Myles Watson wrote:
>> 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?
>>  Yes, The vga bit on the subtractive bridge routes the graphics io.
> How did you work around the vm86 problem? Did the graphics command register
> get re-enabled?

I made the interrupts self contained, with no output.  The VGA ROM
initialization returns, but there is no output to the screen.  At least the
screen turns black on an int10 now, though.

The only differences between the PCI configuration registers now is that v3
has a little larger space for VGA and SERR is set.

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