AHCI(4) FreeBSD Kernel Interfaces Manual AHCI(4)
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
intro(4), jmb(4), pci(4), pciide(4), scsi(4)
HISTORY
The ahci driver first appeared in OpenBSD 4.1.
AUTHORS
The ahci driver was written by David Gwynne <
[email protected]> and
Christopher Pascoe <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 July 2, 2018 FreeBSD 14.1-RELEASE-p8