WDT(4) OpenBSD Programmer's Manual (i386) WDT(4)NAMEwdt - ICS PCI-WDT500/501 watchdog timer device
SYNOPSIS
wdt0 at pci?
DESCRIPTION
The wdt driver provides support for the Industrial Computer Source PCI-
WDT500 and PCI-WDT501 boards.
For PCI-WDT500 boards, basic watchdog timer functionality is supported.
For PCI-WDT501 boards, the onboard buzzer will sound when the watchdog
counter expires. The sensors are not yet supported.
If the kernel crashes, the watchdog timer is not reset and the system
will reboot (assuming a proper connection is made between the WDT50x and
motherboard). Alternatively, the watchdog can be reinitialized via a
userland process which ensures that process scheduling, not just kernel
timeout processing, is still taking place. See watchdog(4) and
watchdogd(8) for more information.
The timer can be configured to have a timeout from 2 to 1800 seconds.
SEE ALSOintro(4), pci(4), watchdog(4), watchdogd(8)HISTORY
The wdt driver first appeared in OpenBSD 2.6.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9