Intel ICH6-M ATA patch

[Vlad Galu]

    Hey guys, I know that NATA will soon render the following patch
[1] obsolete, but it helps me reach full speed with the drive in my
lappie. The diff is against HEAD.
[1] http://night.rdslink.ro/dudu/misc/dragonflybsd/ata_ich6m.diff

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