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+.\"   $OpenBSD: smu.4,v 1.1 2005/10/19 15:20:45 kettenis Exp $
+.\"
+.\" Copyright (c) 2005 Mark Kettenis
+.\"
+.\" 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 October 19, 2005
+.Dt SMU 4 macppc
+.Os
+.Sh NAME
+.Nm smu
+.Nd System Management Unit driver
+.Sh SYNOPSIS
+.Cd "smu? at mainbus0"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the System Management Unit found on Apple
+.Tn iMac G5
+and some 
+.Tn Power Mac G5
+machines.
+.Pp
+The System Management Unit controls the fans in these systems.
+It also contains the real time clock.
+.Sh SEE ALSO
+.Xr intro 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 3.9 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by Mark Kettenis.
+.Sh BUGS
+Currently only the real time clock functionality is supported.