[coreboot] vga not working

Kevin O'Connor kevin at koconnor.net
Mon Aug 17 13:43:52 CEST 2009

On Mon, Aug 17, 2009 at 01:21:17PM +0200, Arnaud Maye wrote:
> I've got the VGA to operating correctly in seabios. Actually it was
> as simple as enabling the VGA forwarding on the pci root complex, in
> the northbridge. Actually during the coreboot boot, the VGA output
> does not make much sense but as soon the OS boots, I can see the
> complete boot.


> This bit can be set for one PCIe "port" or the other, actually two
> possible settings but both cannot be enabled in the same time. So
> the bit to set depends where the GFX card is attached in fact.
> Should we proceed with this "detection" to set the correct bit or
> can we assume the user connects his card to PCIe SLOT0, in this case
> we hard code the correct bit setting for PCIe SLOT0?
> So far I am doing this in the auto.c file after the RAM
> verification, and this is not the best place to do that, I
> know. Where would be the best place to patch that in? In a way we
> are only setting one bit nothing more.

As far as I know, this is supposed to be done by the option
CONFIG_CONSOLE_VGA.  (For example, see set_vga_bridge_bits() in
src/devices/device.c.)  If that option isn't setting all the bits,
then it sounds like it needs to be extended.


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