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
ichwd
Alternatively, to load the driver as a module at boot time, place the following
line in
loader.conf(5):
DESCRIPTION¶
The
ichwd 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¶
watchdog(4),
watchdog(8),
watchdogd(8),
watchdog(9)
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⟩.