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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 〈dhawkins@tamu.edu〉 and
     Dag-Erling Smørgrav 〈des@FreeBSD.org〉.  This manual page was written by
     Dag-Erling Smørgrav 〈des@FreeBSD.org〉.