PROBLEM: Agpgart and DMA -> Hang on 2.6.1-rc1-mm1

Hi,

Kernel 2.6.1-rc1-mm1, 2.6.0-mm1 and 2.6.0 do not work for me when I enable DMA for
harddisks and try to load agpgart and agp-amd-k7 (either as modules or compiled into the kernel). Symptoms are that the modules get loaded correct, and I can say "ls" in the terminal, but after a short time, e.g. if I login in a new console, I'm getting a dma_timer_expiry.

I can load agpgart and compile for hours without problems, but as soon as I load amd-k7-agp, systems stops working.

I'm still abled to change console, but I cant do anything. If I disable automatic DMA in the kernel, the problem goes away. So I'm either with a slow harddrive or without 3D acceleration, both is not good. AGP aperture is set to 256MB. If I compile kernel debugging, I dont see anything special in the logfile.

Keywords: agp, agpgart, dma, smp

System: 2 x Athlon-MP 2400; Asus A7M266-D, 512 MB, stripped down all unneeded stuff, so its just ATI Radeon 9500 Pro, 1 Harddisk, 3c59x network card.

I attached lspci -vvv, /proc/ioports, kernel .config

With kind regards, Peter

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