[SeaBIOS] [PATCH] pci vga: Support VGA behind bridges

Kevin O'Connor kevin at koconnor.net
Fri Mar 1 05:03:32 CET 2013

On Thu, Feb 28, 2013 at 10:52:49AM -0700, Alex Williamson wrote:
> We currently expect to find VGA devices on the root bus but we will
> also support them below bridges iff the VGA routing across the bridges
> is pre-configured.  This patch maintains that behavior, but also
> enables SeaBIOS to enable VGA routing to the first VGA class device it
> finds when there is no preconfigured device.  This allows us to
> support VGA devices behind root ports and bridges without special
> setup from QEMU.
> --- a/src/optionroms.c
> +++ b/src/optionroms.c
> @@ -439,13 +439,47 @@ vgarom_setup(void)

I don't think that optionroms.c is the right place for this logic.  On
coreboot, Xen, and CSM, SeaBIOS shouldn't be touching the PCI config.
It's only QEMU that would need this logic, so something like pciinit.c
is where this logic should go.


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