Problem with SATA-600 (a.k.a. SATA 3) disk

[dieterbsd at engineer.com]

Oliver Fromme writes:
> ahcich3: Timeout on slot 0

> Is there a way to force FreeBSD to use SATA-300 only?
> I've searched the mailing lists, but without results.

man ahci says:

  The following tunables are settable from the loader(8):

     hint.ahcich.X.sata_rev
      setting to nonzero value limits maximum SATA revision (speed).  
Values 1,
     2 and 3 are respectively 1.5, 3 and 6Gbps.