Messages in this thread | | | Date | Mon, 27 Dec 2004 01:08:44 +0100 | From | Pierre Ossman <> | Subject | ISA DMA demand mode (again) |
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A few months ago I asked why the linux ISA DMA code is locked to use only single mode but I didn't get much of a response. Now this has move from a curiosity to a necessity for my driver so I'm asking again. Using single mode I get transfer rates of 300 kBps. With demand mode I get 1500 kBps. So you see why I'd like to use demand mode.
Side note: If I tell the DMA controller to do single mode and the chip to do demand I get 480 kBps. I find it amazing that it works at all in this case.
I included the people who helped me with the wonderful world of ISA DMA (;)) the last time in the hope that you might have some insight into this.
Rgds Pierre - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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