Manual Pages  — WDATWD

To compile this driver into the kernel, place the following line in your kernel configuration file: device wdatwd

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

wdatwd_load="YES"

The wdatwd driver provides watchdog(4) support for the watchdog interrupt timer in ACPI WDAT (Watchdog Action Table).

Since WDAT itself is an abstraction for the real hardware such as ICH WDT, it must be noted that only one driver can be used at a time, either the real hardware specific driver or this driver.

The following read-only sysctl(8) variables are available:

dev.wdatwd.%d.running
	The status of the watchdog timer. 0 if not running, or 1 if running.
dev.wdatwd.%d.timeout
	The current value of the watchdog timeout in millisecond. This can be 0 on some systems, and the zero value means that the default timeout is used.
dev.wdatwd.%d.timeout_configurable
	Whether the timeout is configurable or not. It is 0 if configurable or any positive value if not.
dev.wdatwd.%d.timeout_default
	The default value of the watchdog timeout in millisecond if any.

ichwd(4), watchdog(4), watchdog(8), watchdogd(8), watchdog(9) http://msdn.microsoft.com/en-us/windows/hardware/gg463320.aspx

Microsoft Corporation, Requirements for Hardware Watchdog Timers Supported by Microsoft(R) Windows Vista(R) and Microsoft Windows Server(R) 2008 Operating Systems, Hardware Watchdog Timers Design Specification, 2006.