PWDOG(4) BSD Kernel Interfaces Manual PWDOG(4)NAME
pwdog -- Quancom PWDOG1 watchdog timer device
SYNOPSIS
pwdog0 at pci?
DESCRIPTION
The pwdog driver provides support for Quancom PWDOG1 boards.
If the kernel crashes, the watchdog timer is not reset and the system will reboot (assuming a proper connection is made between the PWDOG1
and the 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.
The timeout period of the PWDOG1 card is set using DIP switches and cannot be changed by software.
SEE ALSO intro(4), pci(4)HISTORY
The pwdog driver first appeared in OpenBSD 4.1 and NetBSD 6.0.
AUTHORS
The pwdog driver was written by Marc Balmer <mbalmer@NetBSD.org>.
BSD August 11, 2011 BSD
Check Out this Related Man Page
SWWDOG(4) BSD Kernel Interfaces Manual SWWDOG(4)NAME
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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