freebsd-dev/share/man/man4/viawd.4
Fabien Thomas 61af1d1393 Add watchdog support for VIA south bridge chipset.
Tested on VT8251, VX900 but CX700, VX800, VX855 should works.

MFC after:	1 month
Sponsored by: NETASQ
2011-12-12 09:50:33 +00:00

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.\"-
.\" Copyright (c) 2011 Fabien Thomas <fabient@FreeBSD.org>
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.Dd December 7, 2011
.Dt VIAWD 4
.Os
.Sh NAME
.Nm viawd
.Nd device driver for VIA south bridge watchdog timer
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following line in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device viawd"
.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
viawd_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides
.Xr watchdog 4
support for the watchdog interrupt timer present on
VIA south bridge chipset (VT8251, CX700, VX800, VX855, VX900).
.Pp
The VIA south bridge have a built-in watchdog timer,
which can be enabled and disabled by user's program and set between
1 to 1023 seconds.
.Pp
The
.Nm
driver when unloaded with running watchdog will reschedule the watchdog
to 5 minutes.
.Sh SEE ALSO
.Xr watchdog 4 ,
.Xr watchdog 8 ,
.Xr watchdogd 8 ,
.Xr watchdog 9
.Sh HISTORY
The
.Nm
driver first appeared in
.Fx 10.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver and this manual page were written by
.An Fabien Thomas Aq fabient@FreeBSD.org .