* ISA DMA demand mode (again)
@ 2004-12-27 0:08 Pierre Ossman
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From: Pierre Ossman @ 2004-12-27 0:08 UTC (permalink / raw)
To: LKML; +Cc: alan, Tommy.Reynolds
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
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