[coreboot] SimNOW VGA int 1a

[Myles Watson]

On Thu, Oct 16, 2008 at 9:49 AM, ron minnich <rminnich at gmail.com> wrote:

> On Thu, Oct 16, 2008 at 8:48 AM, Myles Watson <mylesgw at gmail.com> wrote:
> >> >> > Check PCI: 1022:2067
> >> >> > found
> >> >> > 0xb102: return 0x120
> >>
> >> the wrong # here?
> >
> > Yes.  It should be device # 4 as far as I can tell.  In the debugger when
> I
> > do a config read to bus 1 dev 4 function 0 I get the right data back.
>  When
> > I do a read to bus 1 dev 2 function 0 I get an error that no device
> > responded.
> >
> > Like I said, I don't know why the reads succeed.
> >
>
> so you need some debug prints in the PCIBIOS support code.
>

Check PCI: 1022:2067
PCI: 01:04.0 found
bus->secondary = 0x1 dev->path.pci.devfn = 0x20
0xb102: return 0x120

Now I'm confused.  I guess 0x120 was correct (the slot is the upper 5 bits
of the byte), so I'm still looking.  Now it makes sense why the reads
succeed, but the config write failure is puzzling.  It's trying to write
0xffffffff to the BAR, but that changes the memory map, so after that write
there's garbage everywhere.  I still haven't found the config register that
gets changed, but it's not in the VGA card's space.

Thanks,
Myles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.coreboot.org/pipermail/coreboot/attachments/20081016/fb2b96a6/attachment.html>