1*9490d37cSjmc.\" $OpenBSD: mainbus.4,v 1.2 2007/05/31 19:19:50 jmc Exp $ 283c0e7acSjmc.\" 383c0e7acSjmc.\" Copyright (c) 2006 Jason McIntyre <jmc@openbsd.org> 483c0e7acSjmc.\" 583c0e7acSjmc.\" Permission to use, copy, modify, and distribute this software for any 683c0e7acSjmc.\" purpose with or without fee is hereby granted, provided that the above 783c0e7acSjmc.\" copyright notice and this permission notice appear in all copies. 883c0e7acSjmc.\" 983c0e7acSjmc.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 1083c0e7acSjmc.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 1183c0e7acSjmc.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 1283c0e7acSjmc.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 1383c0e7acSjmc.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 1483c0e7acSjmc.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 1583c0e7acSjmc.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 1683c0e7acSjmc.\" 17*9490d37cSjmc.Dd $Mdocdate: May 31 2007 $ 1883c0e7acSjmc.Dt MAINBUS 4 1983c0e7acSjmc.Os 2083c0e7acSjmc.Sh NAME 2183c0e7acSjmc.Nm mainbus 2283c0e7acSjmc.Nd device tree root 2383c0e7acSjmc.Sh SYNOPSIS 2483c0e7acSjmc.Cd "mainbus0 at root" 2583c0e7acSjmc.Sh DESCRIPTION 2683c0e7acSjmc.Nm 2783c0e7acSjmcprovides an abstraction for all system buses to attach to. 2883c0e7acSjmcIt is the start of the device tree and always attached. 2983c0e7acSjmcIt is not a physical device as such, 3083c0e7acSjmcbut an abstraction to which other devices may attach. 3183c0e7acSjmc.Pp 3283c0e7acSjmcThe actual buses which attach are largely machine-dependent; 3383c0e7acSjmcrefer to the individual man pages for more information. 3483c0e7acSjmc.Sh SEE ALSO 3583c0e7acSjmc.Xr autoconf 4 , 3683c0e7acSjmc.Xr intro 4 37