$OpenBSD: ahci.4,v 1.13 2018/07/02 15:39:33 kettenis Exp $
Copyright (c) 2006 David Gwynne <dlg@openbsd.org>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.Dd $Mdocdate: March 25 2017 $ .Dt AHCI 4 .Os .Sh NAME .Nm ahci .Nd Advanced Host Controller Interface for Serial ATA .Sh SYNOPSIS .Cd "ahci* at acpi?" .Cd "ahci* at fdt?" .Cd "ahci* at pci?" .Cd "ahci* at jmb?" .Sh DESCRIPTION The .Nm driver provides support for Serial ATA controllers conforming to the Advanced Host Controller Interface specification.
Copyright (c) 2006 David Gwynne <dlg@openbsd.org>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.Dd $Mdocdate: March 25 2017 $ .Dt AHCI 4 .Os .Sh NAME .Nm ahci .Nd Advanced Host Controller Interface for Serial ATA .Sh SYNOPSIS .Cd "ahci* at acpi?" .Cd "ahci* at fdt?" .Cd "ahci* at pci?" .Cd "ahci* at jmb?" .Sh DESCRIPTION The .Nm driver provides support for Serial ATA controllers conforming to the Advanced Host Controller Interface specification.
p Several AHCI capable controllers also provide a compatibility mode that causes them to appear as a traditional ATA controller supported by .Xr pciide 4 .
p Although .Nm controllers are actual ATA controllers, the driver emulates SCSI via a translation layer.
p Setting the lowest bit (0x1) of the driver flags forces .Nm to negotiate SATA 1 (1.5 Gb/s) transfer speeds only. It may be useful where higher speeds are unstable. .Sh SEE ALSO .Xr intro 4 , .Xr jmb 4 , .Xr pci 4 , .Xr pciide 4 , .Xr scsi 4 .Sh HISTORY The .Nm driver first appeared in .Ox 4.1 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An David Gwynne Aq Mt dlg@openbsd.org and .An Christopher Pascoe Aq Mt pascoe@openbsd.org .