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SubjectRe: Testing IDE-TCQ and Taskfile - doesn't work nicely:)
Bartlomiej Zolnierkiewicz wrote:
> TCQ shouldn't be enabled on hdc, you have two drives on second ide
> channel and current TCQ driver design allows only one drive per channel,
> so proper fix is to not enable TCQ :-).


IMO the best rule is "enable TCQ if and only if 100% of the channel
supports TCQ".

So, two drives on the same channel can do TCQ, if and only if they both
support TCQ. That's a big benefit of bus release, after all,
simultaneously servicing multiple drives. The device-select and service
interrupt semantics are annoying but doable.

Jeff



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