Re: Testing IDE-TCQ and Taskfile - doesn't work nicely:)

[Jeff Garzik]

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