1c0103f02SDag-Erling Smørgrav.\"- 2c0103f02SDag-Erling Smørgrav.\" Copyright (c) 2007 Dag-Erling Co�dan Sm�rgrav 3c0103f02SDag-Erling Smørgrav.\" All rights reserved. 4c0103f02SDag-Erling Smørgrav.\" 5c0103f02SDag-Erling Smørgrav.\" Redistribution and use in source and binary forms, with or without 6c0103f02SDag-Erling Smørgrav.\" modification, are permitted provided that the following conditions 7c0103f02SDag-Erling Smørgrav.\" are met: 8c0103f02SDag-Erling Smørgrav.\" 1. Redistributions of source code must retain the above copyright 9c0103f02SDag-Erling Smørgrav.\" notice, this list of conditions and the following disclaimer. 10c0103f02SDag-Erling Smørgrav.\" 2. Redistributions in binary form must reproduce the above copyright 11c0103f02SDag-Erling Smørgrav.\" notice, this list of conditions and the following disclaimer in the 12c0103f02SDag-Erling Smørgrav.\" documentation and/or other materials provided with the distribution. 13c0103f02SDag-Erling Smørgrav.\" 14c0103f02SDag-Erling Smørgrav.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15c0103f02SDag-Erling Smørgrav.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16c0103f02SDag-Erling Smørgrav.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17c0103f02SDag-Erling Smørgrav.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18c0103f02SDag-Erling Smørgrav.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19c0103f02SDag-Erling Smørgrav.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20c0103f02SDag-Erling Smørgrav.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21c0103f02SDag-Erling Smørgrav.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22c0103f02SDag-Erling Smørgrav.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23c0103f02SDag-Erling Smørgrav.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24c0103f02SDag-Erling Smørgrav.\" SUCH DAMAGE. 25c0103f02SDag-Erling Smørgrav.\" 26c0103f02SDag-Erling Smørgrav.\" $FreeBSD$ 27c0103f02SDag-Erling Smørgrav.\" 280e5f2a77SRui Paulo.Dd August 20, 2008 29c0103f02SDag-Erling Smørgrav.Dt ICHWD 4 30c0103f02SDag-Erling Smørgrav.Os 31c0103f02SDag-Erling Smørgrav.Sh NAME 32c0103f02SDag-Erling Smørgrav.Nm ichwd 33c0103f02SDag-Erling Smørgrav.Nd device driver for the Intel ICH watchdog interrupt timer 34c0103f02SDag-Erling Smørgrav.Sh SYNOPSIS 35c0103f02SDag-Erling SmørgravTo compile this driver into the kernel, 36c0103f02SDag-Erling Smørgravplace the following line in your 37c0103f02SDag-Erling Smørgravkernel configuration file: 38c0103f02SDag-Erling Smørgrav.Bd -ragged -offset indent 39c0103f02SDag-Erling Smørgrav.Cd "device ichwd" 40c0103f02SDag-Erling Smørgrav.Ed 41c0103f02SDag-Erling Smørgrav.Pp 42c0103f02SDag-Erling SmørgravAlternatively, to load the driver as a 43c0103f02SDag-Erling Smørgravmodule at boot time, place the following line in 44c0103f02SDag-Erling Smørgrav.Xr loader.conf 5 : 45c0103f02SDag-Erling Smørgrav.Bd -literal -offset indent 46c0103f02SDag-Erling Smørgravichwd_load="YES" 47c0103f02SDag-Erling Smørgrav.Ed 48c0103f02SDag-Erling Smørgrav.Sh DESCRIPTION 49c0103f02SDag-Erling SmørgravThe 50c0103f02SDag-Erling Smørgrav.Nm 51c0103f02SDag-Erling Smørgravdriver provides 52c0103f02SDag-Erling Smørgrav.Xr watchdog 4 530e5f2a77SRui Paulosupport for the watchdog interrupt timer present on 540e5f2a77SRui Pauloall Intel ICH motherboard chipsets. 550e5f2a77SRui Paulo.Pp 560e5f2a77SRui PauloThe ICH WDT counts down in ticks of approximately 0.6 seconds; the 570e5f2a77SRui Pauloexact value depends on hardware quality and environmental factors. 580e5f2a77SRui PauloSupported watchdog intervals range from 2 to 63 ticks. 590e5f2a77SRui Paulo.Pp 600e5f2a77SRui PauloNote that on some ICH-based systems, the WDT may be present but 610e5f2a77SRui Paulodisabled, either in hardware or by the BIOS. 620e5f2a77SRui PauloThe 630e5f2a77SRui Paulo.Nm 640e5f2a77SRui Paulodriver attempts to detect this condition and will refuse to attach if 650e5f2a77SRui Pauloit believes the WDT is disabled. 66c0103f02SDag-Erling Smørgrav.Sh SEE ALSO 67c0103f02SDag-Erling Smørgrav.Xr watchdog 4 , 68c0103f02SDag-Erling Smørgrav.Xr watchdog 8 , 69782d6affSAndriy Gapon.Xr watchdogd 8 , 700e5f2a77SRui Paulo.Xr watchdog 9 710e5f2a77SRui Paulo.Rs 720e5f2a77SRui Paulo.%T Using the Intel ICH Family Watchdog Timer (WDT) 730e5f2a77SRui Paulo.%R Intel Application Note AP-725 740e5f2a77SRui Paulo.%O Document Number 292273-001 750e5f2a77SRui Paulo.Re 76c0103f02SDag-Erling Smørgrav.Sh HISTORY 77c0103f02SDag-Erling SmørgravThe 78c0103f02SDag-Erling Smørgrav.Nm 79c0103f02SDag-Erling Smørgravdriver first appeared in 80c0103f02SDag-Erling Smørgrav.Fx 5.3 . 81c0103f02SDag-Erling Smørgrav.Sh AUTHORS 82c0103f02SDag-Erling Smørgrav.An -nosplit 83c0103f02SDag-Erling SmørgravThe 84c0103f02SDag-Erling Smørgrav.Nm 850e5f2a77SRui Paulodriver was written by 860e5f2a77SRui Paulo.An Wm. Daryl Hawkins Aq dhawkins@tamu.edu 870e5f2a77SRui Pauloof Texas A&M University and 880e5f2a77SRui Paulo.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org . 89c0103f02SDag-Erling SmørgravThis manual page was written by 90c0103f02SDag-Erling Smørgrav.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org . 91