Luben Tuikov wrote:
On 08/22/05 01:12, Douglas Gilbert wrote:
I was surprised how much code needed changing.
With MODE SELECT's issues with libata addressed
various other SAT "extras" should be much easier
to implement. That should make libata more attractive
as a SAT layer for SAS LLDDs (that don't do it already
in firmware).
Doug, how about never needing a SAT layer for SAS LLDDs
for ATA/ATAPI devices.
Would you object if I "give" you a "domain device" to which
you can send FISes (+ the packet if ATAPI) through
a SAM-4 intefrace: Execute Task + TMFs?
Jeff?
SAT is the useful piece of libata that makes everything work. You can't
rip out it and still expect to do anything useful ;-)
libata relies on SCSI's device class drivers -- sd, sr, st, sg -- to
manage devices and generate commands to service. And in turn, we rely
on SAT (libata-scsi.c) to translate device class commands into ATA commands.
If the SAT layer went away, then nothing would exist to generate
commands for libata to service.
Jeff
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