Radeon 9000 Pro corruption problem on PPC when DRI is enabled

[Alex Deucher]

On 8/23/06, Roland Scheidegger <rscheidegger_lists at hispeed.ch> wrote:
> Ari Entlich wrote:
> >>>> I could /try/ to look at the code, but I know nothing about Radeon
> >>>> hardware and my C skills aren't quite professional-grade just yet, so
> >>>>  I can't promise anything :-).
> >>> The attached patch might fix things. Completely untested, I think it
> >>> should apply to pretty much any version of radeon_bios.c you can find...
> >>>
> >> Yeah, ok, I'll try that. God, I love Gentoo :-). Is that the test
> >> radeonfb uses?
> >>
> >
> > Awesome!!! This fixed both the DRI corruption and UseFBDev problems!
> > Well, that patch as you sent it didn't fix it (keep reading), but the
> > problem has definitely been identified! The check you used to test for
> > an x86 BIOS doesn't work
> The test is bogus (the 0x14 value is relative to the adress at 0x18, not
> relative to the vbios start). So it wouldn't work.
> That said, I don't understand why it would get identified as a x86 bios
> if it isn't, as xf86ReadPciBIOS checks that itself, so in fact there
> shouldn't be any need to put in the same verification again in the
> radeon driver.
> There is some debug code in xserver/xorg/hw/xfree86/os-support/bus/Pci.c
> (PRINT_PCI) maybe this would provide some insight what's going on. There
> seems to be absolutely no code difference between 6.8.2 and 7.1 there,
> just as there doesn't seem to be a difference in the radeon driver
> itself wrt to bios reading...

perhaps this is related to airlied's change to use sysfs access to the
rom in 7.1 on linux.

Alex

>
> Roland
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