[issue1449] AHCI panic on Intel 6321ESB AHCI

[Matthew Dillon]

    Ok, here's another AHCI patch to try.

	fetch http://apollo.backplane.com/DFlyMisc/ahci08.patch

    It is a bit of a long-shot but I'm crossing my fingers.  Your AHCI
    chipset is running ahci-1.1 and does not have the PMD bit set.  It's
    possible that the disk identify command is overlapping a page-boundary
    and the AHCI chip is blowing up the machine when that occurs.

    I'm a bit at a loss as the problem appears to be a bit
    non-deterministic.

						-Matt