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...
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