Peer Chen wrote:
We did the many test with the new version driver and didn't encounter
that problem, but in certain cases, DMASETUP command packets from drive
to the controller are corrupted, and the controller issues an R_ERR to
the drive. Drives that comply with SATA spec will re-transmit the
corrupted packet and normal operation continues. However, some Maxtor
NCQ drives do not re-transmit the DMASETUP command packet, resulting in
software timeout for this command. So if you are using the Maxtor HD and
meet this problem,please don't enable the NCQ function.
Users should not be expected to know those details, nor be forced to
suffer discovering this in the field (over and over again for each
customer).
We have a list of problem devices ata_device_blacklist[] in
drivers/ata/libata-core.c that should be modified to note each drive
where NCQ should never be used.
Jeff
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