.\" $OpenBSD: mainbus.4,v 1.2 2007/05/31 19:19:50 jmc Exp $ .\" .\" Copyright (c) 2006 Jason McIntyre .\" .\" 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: May 31 2007 $ .Dt MAINBUS 4 .Os .Sh NAME .Nm mainbus .Nd device tree root .Sh SYNOPSIS .Cd "mainbus0 at root" .Sh DESCRIPTION .Nm provides an abstraction for all system buses to attach to. It is the start of the device tree and always attached. It is not a physical device as such, but an abstraction to which other devices may attach. .Pp The actual buses which attach are largely machine-dependent; refer to the individual man pages for more information. .Sh SEE ALSO .Xr autoconf 4 , .Xr intro 4