bionic (4) ichwd.4freebsd.gz

Provided by: freebsd-manpages_11.1-3_all bug

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):

           ichwd_load="YES"


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>.