0d0a2dff3b
Submitted by: marius Reviewed by: ru Approved by: re (blanket) X-MFC: not before the code in RELENG_5 matches these man pages or vice versa
89 lines
2.8 KiB
Groff
89 lines
2.8 KiB
Groff
.\"-
|
|
.\" 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 RTC 4 sparc64
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rtc
|
|
.Nd "non-volatile RAM / real time clock"
|
|
.Sh SYNOPSIS
|
|
.Cd "device genclock"
|
|
.Cd "device mc146818"
|
|
.Cd "device rtc"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver is a front-end for the machine-independent
|
|
.Tn Motorola
|
|
MC146818 and compatible clocks driver.
|
|
The
|
|
.Tn Motorola
|
|
MC146818 and compatible clocks 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 Dallas /
|
|
.Tn Maxim Semiconductor
|
|
DS1287 chips
|
|
(those are compatible to the
|
|
.Tn Motorola
|
|
MC146818 clocks)
|
|
are found on the ISA bus of
|
|
.Tn UltraSPARC II
|
|
systems and the EBus bus of
|
|
.Tn UltraSPARC III
|
|
systems.
|
|
.Sh DIAGNOSTICS
|
|
The following driver specific error message may be reported:
|
|
.Bl -diag
|
|
.It "mc146818_attach_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 eeprom 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver first appeared in
|
|
.Fx 5.4 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Nm
|
|
driver was written by
|
|
.An "Marius Strobl" Aq marius@FreeBSD.org .
|