NAME
ichwd —
device driver for the Intel ICH
watchdog interrupt timer
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device ichwdAlternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
ichwd_load="YES"
DESCRIPTION
Theichwd driver provides
watchdog(4) support for the watchdog interrupt timer present on all
Intel ICH motherboard chipsets.
The ICH WDT counts down in ticks of approximately 0.6 seconds; the exact value depends on hardware quality and environmental factors. Supported watchdog intervals range from 2 to 63 ticks.
Note that on some ICH-based systems, the WDT may be present but
disabled, either in hardware or by the BIOS. The
ichwd driver attempts to detect this condition and
will refuse to attach if it believes the WDT is disabled.
SEE ALSO
Using the Intel ICH Family Watchdog Timer (WDT), Intel Application Note AP-725, Document Number 292273-001.
HISTORY
The ichwd driver first appeared in
FreeBSD 5.3.
AUTHORS
The ichwd driver was written by
Wm. Daryl Hawkins
<dhawkins@tamu.edu>
of Texas A&M University and Dag-Erling
Smørgrav
<des@FreeBSD.org>.
This manual page was written by Dag-Erling
Smørgrav
<des@FreeBSD.org>.