On Mon, 10 Sep 2001 22:37:32 +0100, Philip Blundell <email@example.com> wrote:
> >I think at least for now I think I'm just going to turn DMA off. I'm
> >still open to trying other experiments, though, if anybody wants to
> >suggest something.
> I guess it would be instructive to know how the corruptions
> correspond to invocations of parport_pc_fifo_write_block_dma. If
> you feel like hacking that function around a bit, how about adding
> a flag that gets set when the "DMA write timed out" condition
> happens; if the flag is set on entry to the function, dump out the
> first few bytes in `buf' to the console and clear the flag again.
> I'm slightly suspicious that there might be a hardware flaw in
> either your DMA controller or your parallel port. If you have
> another computer with a different chipset available, it would be
> interesting to know whether you can make the same thing happen.
I'm also slightly suspicious of the hardware, but unfortunately
I've only got the one machine that has DMA and is running a 2.4.x
kernel. The only other 2.4.x machine I have access to at the
moment doesn't have DMA.
I'll try the buf dump when I get a chance.
-- Dave Strauss
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This archive was generated by hypermail 2b29 : Tue Sep 11 2001 - 18:01:12 EDT