.\"-
.\" Copyright (c) 2004 Dag-Erling Coïdan Smørgrav
.\" All rights reserved.
.\"
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.\" $FreeBSD$
.\"
.Dd May 11, 2004
.Dt ICHWD 4 i386
.Os
.Sh NAME
.Nm ichwd
.Nd Intel ICH watchdog timer driver
.Sh SYNOPSIS
.Cd device ichwd
.Sh DESCRIPTION
This driver provides access to the watchdog timer (WDT) present on all
Intel ICH chipsets.
.Pp
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.
.Pp
Note that on some ICH-based systems, the WDT may be present but
disabled, either in hardware or by the BIOS.
The
.Nm
driver attempts to detect this condition and will refuse to attach if
it believes the WDT is disabled.
.Sh SEE ALSO
.Xr watchdog 4 ,
.Xr watchdog 8 ,
.Xr watchdogd 8 ,
.Xr watchdog 9
.Rs
.%T Using the Intel ICH Family Watchdog Timer (WDT)
.%R Intel Application Note AP-725
.%O Document Number 292273-001
.Re
.Sh HISTORY
The
.Nm
driver appeared in
.Fx 5.3 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Wm. Daryl Hawkins Aq dhawkins@tamu.edu
and
.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
This manual page was written by
.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
