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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

SWWDOG(4)						   BSD Kernel Interfaces Manual 						 SWWDOG(4)

swwdog -- software watchdog timer SYNOPSIS
pseudo-device swwdog DESCRIPTION
The swwdog driver provides a software watchdog timer that works with wdogctl(8). If the timer expires, the system reboots if the boolean variable swwdog_reboot is true; otherwise, the system will panic. swwdog_reboot is accessible as a sysctl(8) variable, hw.swwdog.reboot and defaults to false. The default period of swwdog is 60 seconds. As with other watchdog timers, the swwdog driver prevents a system from suspending when the watchdog is armed. SEE ALSO
sysctl(8), wdogctl(8) HISTORY
The swwdog driver was written by Steven M. Bellovin. BUGS
Only one watchdog timer can be active at any given time. (Arguably, this is a bug in the watchdog timer framework.) Therefore, only a sin- gle instance of the swwdog device can be created. Kernel tickle mode is useless with swwdog and arguably should be rejected, since both it and this driver rely on the same callout mechanism; if one is blocked, almost certainly the other is as well. The alarm option to wdogctl(8) isn't implemented. BSD
June 8, 2011 BSD
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