Tejun Heo wrote:
Most BIOSen, Windows and old IDE driver don't reset at all during
probing. They first issue IDENTIFY unconditionally, if that fails,
IDENTIFY_PACKET. From the beginning, libata has issued reset during
Not true for BIOS. A large sub-section of BIOS (Phoenix and/or
Award-based BIOSen) do SRST along with the Hale Landis device detection
(ata_devchk in libata-core.c). Ditto for several ATA vendor BIOS found
on the card.
I'm about to dive into some heads-down RHEL backporting (whee), so I
cannot look at the code in depth this weekend, but here are my basic
thoughts:
* We knew there would be fallout from the new reset-sequence code, and
this is clearly in that category.
* It worked before #reset-seq merge AFAICT, which implies the old method
of probing -- which included SRST -- worked.
* If this was a major problem, I would think there would be a flood of
bug reports for Fedora 7 (just released, and in testing w/ #reset-seq
for a little while), since it is using libata for PATA as well as SATA.
So this, just this one bug report right?
I would go back and look at the differences in the low-level register
bitbanging, and what specifically changed there. If the old stuff
worked, that tends to imply a problem with the new stuff...
Jeff
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