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⟩.