---
name: "ichwd"
section: "4"
platform: "linux"
package: "freebsd-manpages"
version: "6.0-5"
release: "Debian 4.0 (Etch)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/ichwd"
---

# ichwd(4)

Intel ICH watchdog timer driver

## NAME

**ichwd** – Intel ICH watchdog timer driver

## SYNOPSIS

**device** **ichwd**

## DESCRIPTION

This driver provides access to the watchdog timer (WDT) present on all Intel ICH 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/4.md), [watchdog(8)](/watchdog/8.md), [watchdogd(8)](/watchdogd/8.md), [watchdog(9)](/watchdog/9.md) *Using the Intel ICH Family Watchdog Timer (WDT)*, Intel Application Note AP-725, Document Number 292273-001.

## HISTORY

The **ichwd** driver appeared in FreeBSD 5.3.

## AUTHORS

The **ichwd** driver was written by Wm. Daryl Hawkins ⟨dhawkins@tamu.edu⟩ and Dag-Erling Smørgrav ⟨des@FreeBSD.org⟩. This manual page was written by Dag-Erling Smørgrav ⟨des@FreeBSD.org⟩.