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.\" $MidnightBSD$ |
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.\"- |
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.\" Copyright (c) 2004 Jason L. Wright (jason@thought.net) |
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.\" Copyright (c) 2005 Marius Strobl <marius@FreeBSD.org> |
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.\" All rights reserved. |
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.\" |
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.\" Redistribution and use in source and binary forms, with or without |
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.\" modification, are permitted provided that the following conditions |
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.\" are met: |
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.\" 1. Redistributions of source code must retain the above copyright |
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.\" notice, this list of conditions and the following disclaimer. |
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.\" 2. Redistributions in binary form must reproduce the above copyright |
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.\" notice, this list of conditions and the following disclaimer in the |
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.\" documentation and/or other materials provided with the distribution. |
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.\" |
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
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.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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.\" POSSIBILITY OF SUCH DAMAGE. |
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.\" |
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.\" from: OpenBSD: clock.4,v 1.3 2004/09/24 07:04:15 miod Exp |
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.\" $FreeBSD: stable/10/share/man/man4/man4.sparc64/rtc.4 147531 2005-06-22 15:35:14Z ru $ |
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.\" |
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.Dd June 18, 2005 |
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.Dt RTC 4 sparc64 |
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.Os |
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.Sh NAME |
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.Nm rtc |
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.Nd "non-volatile RAM / real time clock" |
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.Sh SYNOPSIS |
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.Cd "device genclock" |
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.Cd "device mc146818" |
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.Cd "device rtc" |
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.Sh DESCRIPTION |
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The |
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.Nm |
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driver is a front-end for the machine-independent |
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.Tn Motorola |
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MC146818 and compatible clocks driver. |
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The |
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.Tn Motorola |
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MC146818 and compatible clocks driver provides access to the real time clock |
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part of the chips it supports to |
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.Fx |
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by interfacing with the generic clock code. |
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.Pp |
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.Tn Dallas / |
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.Tn Maxim Semiconductor |
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DS1287 chips |
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(those are compatible to the |
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.Tn Motorola |
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MC146818 clocks) |
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are found on the ISA bus of |
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.Tn UltraSPARC II |
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systems and the EBus bus of |
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.Tn UltraSPARC III |
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systems. |
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.Sh DIAGNOSTICS |
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The following driver specific error message may be reported: |
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.Bl -diag |
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.It "mc146818_attach_attach: battery low" |
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The device signals that its battery is low and should be replaced. |
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The |
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.Nm |
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driver refused to attach the device in this case as the time in the real time |
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clock is probably invalid. |
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This gives the generic clock code the chance to use another device as the |
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system real time clock that otherwise would not have been chosen. |
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.El |
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.Sh SEE ALSO |
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.Xr ebus 4 , |
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.Xr eeprom 4 |
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.Sh HISTORY |
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The |
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.Nm |
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driver first appeared in |
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.Fx 5.4 . |
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.Sh AUTHORS |
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The |
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.Nm |
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driver was written by |
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.An "Marius Strobl" Aq marius@FreeBSD.org . |
