mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
114 lines
3.5 KiB
Groff
114 lines
3.5 KiB
Groff
.\"-
|
|
.\" Copyright (c) 2012 Bjoern A. Zeeb <bz@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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 28, 2012
|
|
.Dt WBWD 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm wbwd
|
|
.Nd device driver for watchdog timer found on Winbond Super I/O chips
|
|
.Sh SYNOPSIS
|
|
To compile this driver into the kernel, place the following line in your
|
|
kernel configuration file:
|
|
.Bd -ragged -offset indent
|
|
.Cd "device wbwd"
|
|
.Ed
|
|
.Pp
|
|
Alternatively, to load the driver as a module at boot time, place the following
|
|
line in
|
|
.Xr loader.conf 5 :
|
|
.Bd -literal -offset indent
|
|
wbwd_load="YES"
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver provides
|
|
.Xr watchdog 4
|
|
support for the watchdog interrupt timer present on at least the following
|
|
Winbond Super I/O chips:
|
|
.Pp
|
|
.Bl -bullet -compact
|
|
.It
|
|
83627HF/F/HG/G Rev. G
|
|
.It
|
|
83627HF/F/HG/G Rev. J
|
|
.It
|
|
83627HF/F/HG/G Rev. UD-A
|
|
.It
|
|
83627DHG IC ver. 5
|
|
.El
|
|
.Sh SYSCTL VARIABLES
|
|
The
|
|
.Nm
|
|
driver provides the following options as
|
|
.Xr sysctl 8
|
|
variables.
|
|
.Bl -tag -width "xxxxxx"
|
|
.It Va dev.wbwd.0.timeout_override
|
|
This variable allows to program the timer to a value independent on the one
|
|
provided by the
|
|
.Xr watchdog 4
|
|
framework while still relying on the regular updates from e.g.
|
|
.Xr watchdogd 8 .
|
|
This is particularly useful if your system provides multiple watchdogs and
|
|
you want them to fire in a special sequence to trigger an NMI after a shorter
|
|
period than the reset timeout for example.
|
|
The value set must not be lower than the sleep time of
|
|
.Xr watchdogd 8 .
|
|
A value of 0 disables this feature and the timeout value provided by
|
|
.Xr watchdog 4
|
|
will be used.
|
|
.It Va dev.wbwd.0.debug_verbose
|
|
If set this sysctl will tell the driver to log its current state before and
|
|
after the timer reset on each invocation from
|
|
.Xr watchdog 9
|
|
to the kernel message buffer for debugging.
|
|
.It Va dev.wbwd.0.debug
|
|
This read-only value gives the state of some registers on last update.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Nm
|
|
driver also provides further sysctl options that are hidden by default.
|
|
See the source code for more information.
|
|
.Sh SEE ALSO
|
|
.Xr watchdog 4 ,
|
|
.Xr device.hints 5 ,
|
|
.Xr watchdog 8 ,
|
|
.Xr watchdogd 8 ,
|
|
.Xr watchdog 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver first appeared in
|
|
.Fx 10.0 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
This manual page was written by
|
|
.An Bjoern A. Zeeb Aq bz@FreeBSD.org .
|