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SubjectRe: [patch]: ide dma timeout retry in pio
> request, when we hit a dma timout. In this case, what we really want to
> do is retry the request in pio mode and revert to normal dma operations
> later again.

really? do we know the nature of the DMA engine problem well enough?
is there a reason to believe that it'll work better "later"?
I guess I was surprised at resorting to PIO - couldn't we just
break the request up into smaller chunks, still using DMA?

I seem to recall Andre saying that the problem arises when the
ide DMA engine looses PCI arbitration during a burst. shorter
bursts would seem like the best workaround if this is the problem...

resorting to PIO would be such a shame, not only because it eats
CPU so badly, but also because it has no checksum like UDMA...

thanks, mark hahn.

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