svwsata —
Serverworks Serial ATA disk controller driver
svwsata* at pci? dev ? function ? flags 0x0000
The svwsata driver supports the Serverworks K2, Frodo4,
  Frodo8 and HT-1000 Serial ATA controllers, and provides the interface with the
  hardware for the ata(4) driver.
The 0x0002 flag forces the svwsata 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.