[coreboot] how to prevent legacy resource conflict with multiple VGA cards

[Myles Watson]

On Thu, Oct 28, 2010 at 11:48 AM, Scott Duplichan <scott at notabs.org> wrote:
> ]> One problem is that the in-box ATI driver for the UMA graphics is
> ]> unstable.
> ]Even with the factory BIOS?
>
> The reference BIOS works fine, so this is a coreboot problem. I have
> added missing family 10h code to the coreboot RS780 GFX initialization,
> and enabled HT3 for the link. I have added missing NP attributes to the
> frame buffer mapping. But the driver still fails after a few seconds.
> There is more debugging to do here. This is the most serious remaining
> Win7 problem I know of for RS780/SB700 boards.
This sounds like a much higher priority problem than the two video
cards problem.  As a way to work-around it, maybe you should just use
Marc's suggestion and disable the UMA device in the devicetree.

I wonder what the driver expects.  Is it looking for the memory
allocation at fixed locations?  Do you have a register dump for the
ATI device with coreboot and the factory BIOS before an OS takes over?

Thanks,
Myles