NAME
ahci —
Advanced Host Controller Interface for
Serial ATA
SYNOPSIS
ahci* at acpi?
ahci* at fdt?
ahci* at pci?
ahci* at jmb?
DESCRIPTION
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.
SEE ALSO
HISTORY
The ahci driver first appeared in
OpenBSD 4.1.
AUTHORS
The ahci driver was written by
David Gwynne
<dlg@openbsd.org> and
Christopher Pascoe
<pascoe@openbsd.org>.