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+.\"   $OpenBSD: smu.4,v 1.11 2018/06/18 06:06:52 jmc 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 $Mdocdate: June 18 2018 $
+.Dt SMU 4 macppc
+.Os
+.Sh NAME
+.Nm smu
+.Nd Apple System Management Unit
+.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 and an I2C controller.
+.Sh SEE ALSO
+.Xr iic 4 ,
+.Xr intro 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 3.9 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Mark Kettenis .
+.Sh BUGS
+Fan control is not implemented yet.