zhao, forrest wrote:
On Fri, 2006-06-09 at 12:47 +0900, Tejun Heo wrote:
If we're gonna do it. EH needs only a few changes probably during
autopsy and report. Fixing up command issue path and implementing
command exclusion (NCQ vs. non-NCQ, sil24 does it in hardware, ahci
doesn't) will be a bit complex though.
Would you please elaborate on command exclusion? Why NCQ commands need
to be excluded from non-NCQ commands?
AHCI spec rev 1.1, sect 1.7. The last paragraph says.
"This multiple-use of the command list is achieved by the HBA only
moving its command list pointer when the BSY, DRQ, and ERR bits are
cleared by the device. System software is responsible to ensure that
queued and non-queued commands are not mixed in the command list."
--
tejun
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