Hello.
Benjamin Herrenschmidt wrote:
The main one is that one their latest cell, they do the following
"workarounds" which I never implemented in drivers/ide/ppc/pmac.c but
I'd like to implement in the libata driver, unless you believe that is
unnecessary:
a) For any ATAPI DMA, If the transfer size is not a multiple of 16
bytes, switch to PIO for this command.
No need to do this in old driver anyway since the *IDE* core only
uses DMA for block commands like READ and WRITE.
Not sure about libata.
It doesn't use DMA to transfer the bulk of ATAPI ? I know it uses PIO
for the CDB but the rest of the transfer isn't done with DMA ?
Like I said, DMA is used only for the *block* transfer commands for
which the transfer size would always be a multiple of 16 bytes.
MBR, Sergei
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