Re: [RFC] Remove AGP support from Radeon/Nouveau/TTM
Hi,
On Tue, 12 May 2020, Michel D?nzer wrote:
> > I still use powerbook G4/1.66 ( AGP4x)and
> > Pegasos 2 ( AGP x1) - I am not sure, maybe here it works in PCI mode?
> > Do you know how to check it?
>
> The radeon driver in current kernels disables AGP by default on PPC, so
> unless you're explicitly enabling it with radeon.agpmode=1/2/4 on the
> kernel command line, it'll be disabled. dmesg will have a line a like
>
> PCI(E) GART of xM enabled (table at 0xXXXXXXXXXXXXXXXX).
>
> if AGP is disabled.
The Pegasos II has no "real" AGP anyway, it's a 66Mhz(?) PCI slot wired in
the form of a physical AGP slot, so AGP graphics cards would work in it.
Back in the days (like, 15 years ago) at least you had to tell XOrg
manually in xorg.conf to go to PCI mode explicitly on a Pegasos II, even
if it detected an AGP Radeon, otherwise the system would just hang or do
weird things. (And probably you had to do the same on a Pegasos I too,
because even if its chipset was advertised to have "true" AGP, but had a
whole set of other bus coherency issues, which more or less invalidated
that claim.)
For the PowerBook, I can't say. I never had luck with the R300 driver
under Linux and PPC, so I never really used Linux on mine. And the Pegasos
was running with an R200.
Charlie
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