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viawd(4) [freebsd man page]

VIAWD(4)						   BSD Kernel Interfaces Manual 						  VIAWD(4)

viawd -- device driver for VIA south bridge watchdog timer SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device viawd Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): viawd_load="YES" DESCRIPTION
The viawd driver provides watchdog(4) support for the watchdog interrupt timer present on VIA south bridge chipset (VT8251, CX700, VX800, VX855, VX900). 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. The viawd driver when unloaded with running watchdog will reschedule the watchdog to 5 minutes. SEE ALSO
watchdog(4), watchdog(8), watchdogd(8), watchdog(9) HISTORY
The viawd driver first appeared in FreeBSD 10.0. AUTHORS
The viawd driver and this manual page were written by Fabien Thomas <>. BSD
December 7, 2011 BSD

Check Out this Related Man Page

WBWD(4) 						   BSD Kernel Interfaces Manual 						   WBWD(4)

wbwd -- device driver for watchdog timer found on Winbond Super I/O chips SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device wbwd Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): wbwd_load="YES" DESCRIPTION
The wbwd driver provides watchdog(4) support for the watchdog interrupt timer present on at least the following Winbond Super I/O chips: o 83627HF/F/HG/G Rev. G o 83627HF/F/HG/G Rev. J o 83627HF/F/HG/G Rev. UD-A o 83627DHG IC ver. 5 SYSCTL VARIABLES
The wbwd driver provides the following options as sysctl(8) variables. dev.wbwd.0.timeout_override This variable allows to program the timer to a value independent on the one provided by the watchdog(4) framework while still relying on the regular updates from e.g. 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 watchdogd(8). A value of 0 disables this feature and the timeout value provided by watchdog(4) will be used. 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 watchdog(9) to the kernel message buffer for debugging. dev.wbwd.0.debug This read-only value gives the state of some registers on last update. The wbwd driver also provides further sysctl options that are hidden by default. See the source code for more information. SEE ALSO
watchdog(4), device.hints(5), watchdog(8), watchdogd(8), watchdog(9) HISTORY
The wbwd driver first appeared in FreeBSD 10.0. AUTHORS
This manual page was written by Bjoern A. Zeeb <>. BSD
December 28, 2012 BSD
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