On 5/11/20 10:12 PM, Christian König wrote: > I unfortunately only have an x86 Mac to test this on, but as far as I know the Radeon > AGP support for PowerPC is disabled for years already because it didn't worked reliable. I have a current Debian unstable running on an iBook G4 with Radeon graphics enabled on a current kernel and graphics stack and it runs fine. Not sure though whether it currently employs all AGP features, but I would like to be able to continue using it and so are the users on the debian-powerpc mailing list. >>> 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]. > > Please note that at least the Mac I was able to test with Radeon hardware just continuous > to work. But it is certainly possible that some pre r3xx generation hardware will break with this. > > We just stop using this bogus idea of trying to use uncached system memory as "extension" of the > on board video memory and instead switch to the reliable device internal GART. Well, the title "Remove AGP support" in the subject implied something else to me which is why I wrote this mail. If this just applies to the mechanism to allow system memory to be used as graphics memory, the results may be different. > Maybe we should just deprecate the configuration option first? Would this change imply the removal of CONFIG_AGP_*? If yes, I assume that would kill CONFIG_AGP_UNINORTH which we have enabled on our PowerPC kernels for powerpc and ppc64. Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaubitz@xxxxxxxxxx `. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
