2012-03-06 18:44:52 +00:00
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.\"-
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.\" Copyright (c) 2012 Bjoern A. Zeeb <bz@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 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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2012-12-28 23:21:54 +00:00
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.Dd December 28, 2012
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2012-03-25 19:34:05 +00:00
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.Dt WBWD 4
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2012-03-06 18:44:52 +00:00
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.Os
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.Sh NAME
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.Nm wbwd
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.Nd device driver for watchdog timer found on Winbond Super I/O chips
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.Sh SYNOPSIS
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To compile this driver into the kernel, 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 wbwd"
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.Ed
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.Pp
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Alternatively, to load the driver as a module at boot time, place the following
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line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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wbwd_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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support for the watchdog interrupt timer present on at least the following
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Winbond Super I/O chips:
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.Pp
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.Bl -bullet -compact
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.It
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83627HF/F/HG/G Rev. G
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.It
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83627HF/F/HG/G Rev. J
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.It
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83627HF/F/HG/G Rev. UD-A
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.It
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83627DHG IC ver. 5
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.El
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.Sh SYSCTL VARIABLES
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The
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.Nm
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driver provides the following options as
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.Xr sysctl 8
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variables.
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2012-03-29 05:02:12 +00:00
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.Bl -tag -width "xxxxxx"
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2012-03-06 18:44:52 +00:00
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.It Va dev.wbwd.0.timeout_override
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This variable allows to program the timer to a value independent on the one
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provided by the
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.Xr watchdog 4
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framework while still relying on the regular updates from e.g.
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.Xr watchdogd 8 .
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This is particularly useful if your system provides multiple watchdogs and
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you want them to fire in a special sequence to trigger an NMI after a shorter
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period than the reset timeout for example.
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The value set must not be lower than the sleep time of
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.Xr watchdogd 8 .
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A value of 0 disables this feature and the timeout value provided by
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.Xr watchdog 4
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will be used.
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.It Va dev.wbwd.0.debug_verbose
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If set this sysctl will tell the driver to log its current state before and
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after the timer reset on each invocation from
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.Xr watchdog 9
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to the kernel message buffer for debugging.
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.It Va dev.wbwd.0.debug
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This read-only value gives the state of some registers on last update.
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.El
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.Pp
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The
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.Nm
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driver also provides further sysctl options that are hidden by default.
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See the source code for more information.
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.Sh SEE ALSO
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.Xr watchdog 4 ,
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.Xr device.hints 5 ,
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.Xr watchdog 8 ,
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.Xr watchdogd 8 ,
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.Xr watchdog 9
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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 10.0 .
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.Sh AUTHORS
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.An -nosplit
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This manual page was written by
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.An Bjoern A. Zeeb Aq bz@FreeBSD.org .
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