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+.\"-
+.\" Copyright (c) 2004 Jason L. Wright (jason@thought.net)
+.\" Copyright (c) 2005 Marius Strobl <marius@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" 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 AUTHOR ``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 AUTHOR 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.
+.\"
+.\"	from: OpenBSD: clock.4,v 1.3 2004/09/24 07:04:15 miod Exp
+.\" $FreeBSD$
+.\"
+.Dd June 18, 2005
+.Dt EEPROM 4 sparc64
+.Os
+.Sh NAME
+.Nm eeprom
+.Nd "non-volatile RAM / real time clock"
+.Sh SYNOPSIS
+.Cd "device genclock"
+.Cd "device mk48txx"
+.Cd "device eeprom"
+.Sh DESCRIPTION
+The
+.Nm
+driver is a front-end for the machine-independent
+.Tn Mostek
+MK48Txx driver.
+The
+.Tn Mostek
+MK48Txx driver provides access to the real time clock part of the chips it
+supports to
+.Fx
+by interfacing with the generic clock code.
+.Pp
+.Tn Mostek
+MK48Txx chips are found on the
+.Tn EBus ,
+.Tn FireHose
+and
+.Tn SBus
+busses of
+.Tn UltraSPARC
+systems.
+On systems where the hostid is stored in the NVRAM part of the Mostek MK48Txx
+chip the
+.Nm
+driver prints out the hostid on attach.
+.Sh DIAGNOSTICS
+The following driver specific error message may be reported:
+.Bl -diag
+.It "mk48txx_attach: battery low"
+The device signals that its battery is low and should be replaced.
+The
+.Nm
+driver refused to attach the device in this case as the time in the real time
+clock is probably invalid.
+This gives the generic clock code the chance to use another device as the
+system real time clock that otherwise would not have been chosen.
+.El
+.Sh SEE ALSO
+.Xr ebus 4 ,
+.Xr fhc 4 ,
+.Xr rtc 4 ,
+.Xr sbus 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 5.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An "Thomas Moestl" Aq tmm@FreeBSD.org
+based on the
+.Nx
+sparc64 clock code written by
+.An "Paul Kranenburg" .