2007-08-23 20:05:09 +00:00
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.\"-
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.\" Copyright (c) 2007 Dag-Erling Co<43>dan Sm<53>rgrav
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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 AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR 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, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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2008-08-21 17:53:13 +00:00
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.Dd August 20, 2008
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2007-08-23 20:05:09 +00:00
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.Dt ICHWD 4
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.Os
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.Sh NAME
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.Nm ichwd
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.Nd device driver for the Intel ICH watchdog interrupt timer
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device ichwd"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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ichwd_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides
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.Xr watchdog 4
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2008-08-21 17:53:13 +00:00
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support for the watchdog interrupt timer present on
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all Intel ICH motherboard chipsets.
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.Pp
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The ICH WDT counts down in ticks of approximately 0.6 seconds; the
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exact value depends on hardware quality and environmental factors.
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Supported watchdog intervals range from 2 to 63 ticks.
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.Pp
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Note that on some ICH-based systems, the WDT may be present but
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disabled, either in hardware or by the BIOS.
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The
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.Nm
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driver attempts to detect this condition and will refuse to attach if
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it believes the WDT is disabled.
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2007-08-23 20:05:09 +00:00
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.Sh SEE ALSO
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.Xr watchdog 4 ,
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.Xr watchdog 8 ,
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2008-08-21 17:53:13 +00:00
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.Xr watchdog 9
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.Rs
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.%T Using the Intel ICH Family Watchdog Timer (WDT)
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.%R Intel Application Note AP-725
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.%O Document Number 292273-001
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.Re
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2007-08-23 20:05:09 +00:00
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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 5.3 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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2008-08-21 17:53:13 +00:00
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driver was written by
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.An Wm. Daryl Hawkins Aq dhawkins@tamu.edu
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of Texas A&M University and
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.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
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2007-08-23 20:05:09 +00:00
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This manual page was written by
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.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
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