NAME
ichwd – Intel ICH watchdog timer driver
SYNOPSIS
device ichwd
DESCRIPTION
This driver provides access to the watchdog timer (WDT) present on all Intel ICH 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 appeared in FreeBSD 5.3.
AUTHORS
The ichwd driver was written by Wm. Daryl Hawkins ⟨[email protected]⟩ and Dag-Erling Smørgrav ⟨[email protected]⟩. This manual page was written by Dag-Erling Smørgrav ⟨[email protected]⟩.