Hi. Managed to get the Radeon R300 running on mesa 11.1.1 with an old 2013 patch from Michel Dànzer, next problem is of course enabling agpmode, running with pci-mode with radeon.agpmode=-1 works, but is of course slow, and seems to load the cpu a lot.
Upon initial investigation i could not initially believe agp could be this this broken for this long, until i found this. "committed with Ben Skeggs on Feb 26, 2013" https://github.com/DespairFactor/bullhead/commit/650e1203c11354ba84d69ba445abc0efcfe3890a http://lxr.free-electrons.com/source/drivers/gpu/drm/nouveau/nouveau_agp.c?v=4.2 #ifdef __powerpc__ /* Disable AGP by default on all PowerPC machines for * now -- At least some UniNorth-2 AGP bridges are * known to be broken: DMA from the host to the card * works just fine, but writeback from the card to the * host goes straight to memory untranslated bypassing * the GATT somehow, making them quite painful to deal * with... */ if (nouveau_agpmode == -1) return false; #endif and now later this: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.c #ifdef __powerpc__ /* Disable AGP by default on all PowerPC machines for now -- At * least some UniNorth-2 AGP bridges are known to be broken: * DMA from the host to the card works just fine, but writeback * from the card to the host goes straight to memory * untranslated bypassing that GATT somehow, making them quite * painful to deal with... */ mode = 0; #endif All seems to point to serious issues had around the time of change to ums to kms and a serious regression hitting the linux kernel? No? Cheers -Mike
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