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+.\" $NetBSD: clock.4,v 1.5 2008/05/05 19:51:23 martin Exp $
+.\"
+.\" Copyright (c) 2006 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Stephan Meisinger.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd February 24, 2006
+.Dt CLOCK 4 sparc
+.Os
+.Sh NAME
+.Nm clock ,
+.Nm oclock
+.Nd Clock driver for Sun SPARC computers
+.Sh SYNOPSIS
+.Cd "clock0 at mainbus0                # sun4c"
+.Cd "clock0 at obio0                   # sun4m"
+.Cd "clock0 at obio0 addr 0xf2000000   # sun4/300"
+.Pp
+.Cd "ooclock0 at obio0 addr 0xf3000000 # sun4/200"
+.Cd "ooclock0 at obio0 addr 0x03000000 # sun4/100"
+.Sh DESCRIPTION
+The
+.Nm
+device contains common timer, clock and eeprom routines for the
+.Nx
+kernel.
+.Pp
+All system use the timer interrupt to drive the hard clock.
+The second interrupt is used to drive statistics clock, except
+sun4/100 and sun4/200 machines, which don't have a spare timer
+device.
+.Sh HARDWARE
+The
+.Nm
+driver provides support for the following chips:
+.Pp
+.Bl -tag -width Dv -offset indent -compact
+.It Tn Dallas DS1287A
+.It Tn Intersil 7170
+.It Tn Mostek Mk48T02
+.It Tn Mostek Mk48T08
+.El
+.Sh SEE ALSO
+.Xr sparc/timer 4
+.Sh HISTORY
+The
+.Nm
+appeared in
+.Nx 1.0 .