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Man Pages


Manual Reference Pages  -  ICHWD (4)

NAME

ichwd - device driver for the Intel ICH watchdog interrupt timer

CONTENTS

Synopsis
Description
See Also
History
Authors

SYNOPSIS

To compile this driver into the kernel, place the following line in your kernel configuration file:


.Cd 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)
.Rs Using the Intel ICH Family Watchdog Timer (WDT)
.Re

HISTORY

The ichwd driver first appeared in
.Fx 5.3 .

AUTHORS


.An -nosplit The ichwd driver was written by
.An Wm. Daryl Hawkins Aq dhawkins@tamu.edu of Texas A&M University 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 .
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