[coreboot] Serengeti VGA

Myles Watson mylesgw at gmail.com
Mon Oct 20 22:05:01 CEST 2008

On Mon, Oct 20, 2008 at 1:56 PM, Myles Watson <mylesgw at gmail.com> wrote:

> 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.

I sent the patch to the list in a message with the subject "temporary fix"

Now x86emu and vm86 have the same behavior.  The both end with a black
display but working serial.

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