[coreboot] how to prevent legacy resource conflict with multiple VGA cards
mylesgw at gmail.com
Thu Oct 28 20:09:20 CEST 2010
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?
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