UAS Query

Madhukar madhukar.gubba at
Thu Mar 19 05:24:25 PDT 2009

* From the T10 Reflector (t10 at, posted by:
* Madhukar <madhukar.gubba at>
Hi All,
I'm a linux device driver developer. I was looking at UAS
specification document. I have basic question from a driver developer
perspective. Pardon me if this is not the right question that needs to
be asked at this place.
The command sequence diagram for non-data, data-in or data-out has a
different sequence of communication. Does the driver developer need to
determine type of SCSI command and then handle appropriate command
if <read> SCSI command
	handle data-in command sequece
if <write> SCSI command
	handle data-out command sequece
anything else
	handle non-data command sequence
The existing BOT protocol does not require to know the type of SCSI
command, it just fills command block wrapper and gets respose in
command status wrapper.
Thanks in Advance.
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