artsata —
Intel i31244 Serial ATA disk controller driver
artsata* at pci? dev ? function ? flags 0x0000
options PCIIDE_I31244_DISABLEDMA
The artsata driver supports the Intel i31244 Serial ATA
  and controllers, and provides the interface with the hardware for the
  ata(4) driver.
The 0x0002 flag forces the artsata driver
    to disable DMA on chipsets for which DMA would normally be enabled. This can
    be used as a debugging aid, or to work around problems where the SATA
    controller is wired up to the system incorrectly.
Early samples of the Intel i31244 Serial ATA controller revision 0 had a bug
  affecting DMA data transfers. Full production samples have been fixed, but
  have the same revision number. The
  PCIIDE_I31244_DISABLEDMA option can be used to disable
  DMA on the buggy revisions.