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ICHWD(4)	       FreeBSD Kernel Interfaces Manual		      ICHWD(4)

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	dis-
     abled.

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 Smorgrav <des@FreeBSD.org>.  This
     manual page was written by	Dag-Erling Smorgrav <des@FreeBSD.org>.

FreeBSD	9.3			August 20, 2008			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=ichwd&manpath=FreeBSD+9.3-RELEASE>

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