Re: [RFC] Remove AGP support from Radeon/Nouveau/TTM

[MH <martin.hrebec@seznam.cz>]

Hi all,

On 5/11/20 9:55 PM, John Paul Adrian Glaubitz wrote:
> Hi Christian!
>
> > Well let's face it AGP is a total headache to maintain and dead for at least 10+ years.
> >
> > We have a lot of x86 specific stuff in the architecture independent graphics memory management
> > to get the caching right, abusing the DMA API on multiple occasions, need to distinct between
> > AGP and driver specific page tables etc etc...
>
> AGP isn't exclusively used on x86 but there are also a lot of PowerPC desktop machines (Apple
> PowerMac, Pegasos etc) that employ AGP graphics.
>
> > So the idea here is to just go ahead and remove the support from Radeon and Nouveau and
> > then drop the necessary code from TTM.
> > For Radeon this means that we just switch over to the driver specific page tables and
> > everything should more or less continue to work.
> >
> > For Nouveau I'm not 100% sure, but from the code it of hand looks like we can do it similar to Radeon.
> >
> > Please comment what you think about this.
>
> I would be against such a move as AGP graphics is still used by people running the powerpc
> and ppc64 Debian ports on their vintage hardware [1].
>
> I have also CC'ed the debian-powerpc mailing list so that other users can voice their
> opinion.

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?

> Thanks,
> Adrian
>
> > [1] https://cdimage.debian.org/cdimage/ports/2020-04-19/

--
MartiH