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>.

Debian                                           August 20, 2008                                        ICHWD(4)