[SeaBIOS] [PATCH] pci vga: Support VGA behind bridges
Alex Williamson
alex.williamson at redhat.com
Fri Mar 1 17:33:42 CET 2013
On Thu, 2013-02-28 at 23:03 -0500, Kevin O'Connor wrote:
> 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.
Ok, I can look at finding a spot for it in pciinit. Note though that
there's nothing QEMU specific about this, if other platforms are already
enabling a route to a VGA device, there's no change. If something
sneaks through without a VGA device enabled, this should generically
enable the first device. Thanks,
Alex
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