diff options
Diffstat (limited to 'share/man/man4/wbwd.4')
-rw-r--r-- | share/man/man4/wbwd.4 | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/share/man/man4/wbwd.4 b/share/man/man4/wbwd.4 new file mode 100644 index 0000000..67af2ec --- /dev/null +++ b/share/man/man4/wbwd.4 @@ -0,0 +1,117 @@ +.\"- +.\" 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 March 6, 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 +.Pp +In +.Pa /boot/device.hints : +.Cd hint.wbwd.0.at="isa" +.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 . |