ahci —
Advanced Host Controller Interface for Serial
ATA
ahci* at acpi?
ahci* at fdt?
ahci* at pci?
ahci* at jmb?
The
ahci driver provides support for Serial
ATA controllers conforming to the Advanced Host Controller Interface
specification.
Several AHCI capable controllers also provide a compatibility mode that causes
them to appear as a traditional ATA controller supported by
pciide(4).
Although
ahci controllers are actual ATA
controllers, the driver emulates SCSI via a translation layer.
Setting the lowest bit (0x1) of the driver flags forces
ahci to negotiate SATA 1 (1.5 Gb/s)
transfer speeds only. It may be useful where higher speeds are unstable.
intro(4),
jmb(4),
pci(4),
pciide(4),
scsi(4)
The
ahci driver first appeared in
OpenBSD 4.1.
The
ahci driver was written by
David Gwynne
<
dlg@openbsd.org>
and
Christopher Pascoe
<
pascoe@openbsd.org>.
![[OpenBSD]](/openbsd.gif){kind=small}