Allen Martin wrote:
The question I had for NVIDIA regarding this that I never got
answered
was, is there any reason why we would need a delay when switching
between NCQ and non-NCQ commands on ADMA, and if not, is
there any known
cause that could cause the controller to get into this seemingly
locked-up state?
When switching from NCQ to non NCQ or vice versa you must make sure all
outstanding commands are completed before issuing the new command. The
hardware doesn't do anything to prevent queued and non queued commands
from going out on the wire at the same time which will certainly cause
some drives to fail.
The software definitely provides that guarantee for all NCQ-capable
controllers.
Jeff
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