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SubjectRe: "Fix ATAPI transfer lengths" causes CD writing regression
> Just to make sure I'm not misunderstanding it.  So, PDC202xx will lock
> up if you transfer allocation size, reset and then try to drain, but
> it's okay to keep draining as part of continued PIO transfer, right?

The following hang mine:

PIO transfer
Reset state machine
Read data register


DMA transfer in progress
Read data register

And this does not

PIO transfer
Keep reading data register while checking DRQ

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