Hello. On 21-02-2011 14:58, Alan Cox wrote:
PIO mode is setup by different code, and it takes care of the IORDY setting according to the PIO rules (and it gets called). DMA mode setup should just ignore the IORDY setting as in all other sane drivers.
Well it can't ignore it - but if you mean just keep the bit as is then
Yes, I mean this.
that sounds sensible, have to see what the docs say happens if you ever set MWDMA without IORDY.
Don't think they say anything on this matter but I can't imagine that IORDY matters for DMA.
... unless the IE bit means something special (and undocumented) for DMA, if Intel so insists on setting it for every DMA mode.
Sure - but it does matter for an ATAPI transaction with then has a DMA phase because those timings will be used for the command transfer which is PIO.
So what? We've already setup PIO timings before the DMA ones. Why force the IE bit?
Alan
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