projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 966c0ba2 SW |
1 | .\" $OpenBSD: ahci.4,v 1.7 2008/04/19 01:18:39 djm Exp $ |
| 2 | .\" | |
| 3 | .\" Copyright (c) 2006 David Gwynne <dlg@openbsd.org> | |
| 4 | .\" | |
| 5 | .\" Permission to use, copy, modify, and distribute this software for any | |
| 6 | .\" purpose with or without fee is hereby granted, provided that the above | |
| 7 | .\" copyright notice and this permission notice appear in all copies. | |
| 8 | .\" | |
| 9 | .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| 10 | .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 11 | .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
| 12 | .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 13 | .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 14 | .\" TORTIOUS ACTION, ARISING OUT OF | |
| 15 | .\" PERFORMANCE OF THIS SOFTWARE. | |
| 16 | .\" | |
| 17 | .Dd June 15, 2009 | |
| 18 | .Dt AHCI 4 | |
| 19 | .Os | |
| 20 | .Sh NAME | |
| 21 | .Nm ahci | |
| 22 | .Nd Advanced Host Controller Interface for Serial ATA | |
| 23 | .Sh SYNOPSIS | |
| 24 | To compile this driver into the kernel, | |
| 25 | place the following line in your | |
| 26 | kernel configuration file: | |
| 27 | .Bd -ragged -offset indent | |
| 28 | .Cd "device ahci" | |
| 29 | .Ed | |
| 30 | .Pp | |
| 31 | Alternatively, to load the driver as a | |
| 32 | module at boot time, place the following line in | |
| 33 | .Xr loader.conf 5 : | |
| 34 | .Bd -literal -offset indent | |
| 35 | ahci_load="YES" | |
| 36 | .Ed | |
| 37 | .Sh DESCRIPTION | |
| 38 | The | |
| 39 | .Nm | |
| 40 | driver provides support for Serial ATA controllers conforming to the | |
| 41 | Advanced Host Controller Interface specification. | |
| 42 | .Pp | |
| 5a205d6e | 43 | Several AHCI capable controllers also provide a compatibility mode that |
| 966c0ba2 SW |
44 | causes them to appear as a traditional ATA controller supported by |
| 45 | .Xr nata 4 . | |
| 46 | .Pp | |
| 47 | Although | |
| 48 | .Nm | |
| 49 | controllers are actual ATA controllers, the driver emulates SCSI via a | |
| 50 | translation layer. | |
| 51 | .Pp | |
| 52 | Setting the lowest bit (0x1) of the driver flags forces | |
| 53 | .Nm | |
| 54 | to negotiate SATA 1 (1.5 Gb/s) transfer speeds only. | |
| 55 | It may be useful where higher speeds are unstable. | |
| 56 | .Sh SEE ALSO | |
| 57 | .Xr intro 4 , | |
| 58 | .Xr pci 4 , | |
| 59 | .Xr nata 4 , | |
| 60 | .Xr scsi 4 , | |
| 61 | .Xr loader.conf 5 | |
| 62 | .Sh HISTORY | |
| 63 | The | |
| 64 | .Nm | |
| 65 | driver first appeared in | |
| 66 | .Dx 2.3 . | |
| 67 | .Sh AUTHORS | |
| 68 | .An -nosplit | |
| 69 | The | |
| 70 | .Nm | |
| 71 | driver was originally written by | |
| 72 | .An David Gwynne Aq dlg@openbsd.org | |
| 73 | and | |
| 74 | .An Christopher Pascoe Aq pascoe@openbsd.org | |
| 75 | for | |
| 76 | .Ox . | |
| 77 | .Pp | |
| 78 | It was ported to | |
| 79 | .Dx | |
| 80 | by | |
| 81 | .An Matt Dillon Aq dillon@apollo.backplane.com | |
| 82 | who added new features such as port multiplier support. |