1ace1ab86SFrancois Tigeot.\"- 2ace1ab86SFrancois Tigeot.\" Copyright (c) 2007 Dag-Erling Coïdan Smørgrav 3ace1ab86SFrancois Tigeot.\" All rights reserved. 4ace1ab86SFrancois Tigeot.\" 5ace1ab86SFrancois Tigeot.\" Redistribution and use in source and binary forms, with or without 6ace1ab86SFrancois Tigeot.\" modification, are permitted provided that the following conditions 7ace1ab86SFrancois Tigeot.\" are met: 8ace1ab86SFrancois Tigeot.\" 1. Redistributions of source code must retain the above copyright 9ace1ab86SFrancois Tigeot.\" notice, this list of conditions and the following disclaimer. 10ace1ab86SFrancois Tigeot.\" 2. Redistributions in binary form must reproduce the above copyright 11ace1ab86SFrancois Tigeot.\" notice, this list of conditions and the following disclaimer in the 12ace1ab86SFrancois Tigeot.\" documentation and/or other materials provided with the distribution. 13ace1ab86SFrancois Tigeot.\" 14ace1ab86SFrancois Tigeot.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15ace1ab86SFrancois Tigeot.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16ace1ab86SFrancois Tigeot.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17ace1ab86SFrancois Tigeot.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18ace1ab86SFrancois Tigeot.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19ace1ab86SFrancois Tigeot.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20ace1ab86SFrancois Tigeot.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21ace1ab86SFrancois Tigeot.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22ace1ab86SFrancois Tigeot.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23ace1ab86SFrancois Tigeot.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24ace1ab86SFrancois Tigeot.\" SUCH DAMAGE. 25ace1ab86SFrancois Tigeot.\" 26ace1ab86SFrancois Tigeot.\" $FreeBSD: src/share/man/man4/ichwd.4,v 1.5 2011/05/22 14:03:30 uqs Exp 27ace1ab86SFrancois Tigeot.\" 286ef1a57dSSascha Wildner.Dd May 3, 2012 29ace1ab86SFrancois Tigeot.Dt ICHWD 4 30ace1ab86SFrancois Tigeot.Os 31ace1ab86SFrancois Tigeot.Sh NAME 32ace1ab86SFrancois Tigeot.Nm ichwd 33ace1ab86SFrancois Tigeot.Nd device driver for the Intel ICH watchdog interrupt timer 34ace1ab86SFrancois Tigeot.Sh SYNOPSIS 35ace1ab86SFrancois TigeotTo compile this driver into the kernel, 36ace1ab86SFrancois Tigeotplace the following line in your 37ace1ab86SFrancois Tigeotkernel configuration file: 38ace1ab86SFrancois Tigeot.Bd -ragged -offset indent 39ace1ab86SFrancois Tigeot.Cd "device ichwd" 40ace1ab86SFrancois Tigeot.Ed 41ace1ab86SFrancois Tigeot.Pp 42ace1ab86SFrancois TigeotAlternatively, to load the driver as a 43ace1ab86SFrancois Tigeotmodule at boot time, place the following line in 44ace1ab86SFrancois Tigeot.Xr loader.conf 5 : 45ace1ab86SFrancois Tigeot.Bd -literal -offset indent 46ace1ab86SFrancois Tigeotichwd_load="YES" 47ace1ab86SFrancois Tigeot.Ed 48ace1ab86SFrancois Tigeot.Sh DESCRIPTION 49ace1ab86SFrancois TigeotThe 50ace1ab86SFrancois Tigeot.Nm 51ace1ab86SFrancois Tigeotdriver provides 52ace1ab86SFrancois Tigeot.Xr watchdog 4 53ace1ab86SFrancois Tigeotsupport for the watchdog interrupt timer present on 54ace1ab86SFrancois Tigeotall Intel ICH motherboard chipsets. 55ace1ab86SFrancois Tigeot.Pp 56ace1ab86SFrancois TigeotThe ICH WDT counts down in ticks of approximately 0.6 seconds; the 57ace1ab86SFrancois Tigeotexact value depends on hardware quality and environmental factors. 58ace1ab86SFrancois TigeotSupported watchdog intervals range from 2 to 63 ticks. 59ace1ab86SFrancois Tigeot.Pp 60ace1ab86SFrancois TigeotNote that on some ICH-based systems, the WDT may be present but 61ace1ab86SFrancois Tigeotdisabled, either in hardware or by the BIOS. 62ace1ab86SFrancois TigeotThe 63ace1ab86SFrancois Tigeot.Nm 64ace1ab86SFrancois Tigeotdriver attempts to detect this condition and will refuse to attach if 65ace1ab86SFrancois Tigeotit believes the WDT is disabled. 66ace1ab86SFrancois Tigeot.Sh SEE ALSO 676ef1a57dSSascha Wildner.Xr watchdogd 8 686ef1a57dSSascha Wildner.\".Xr wdog 4 , 696ef1a57dSSascha Wildner.\".Xr wdog 9 70ace1ab86SFrancois Tigeot.Rs 71ace1ab86SFrancois Tigeot.%T Using the Intel ICH Family Watchdog Timer (WDT) 72ace1ab86SFrancois Tigeot.%R Intel Application Note AP-725 73ace1ab86SFrancois Tigeot.%O Document Number 292273-001 74ace1ab86SFrancois Tigeot.Re 75ace1ab86SFrancois Tigeot.Sh HISTORY 76ace1ab86SFrancois TigeotThe 77ace1ab86SFrancois Tigeot.Nm 78ace1ab86SFrancois Tigeotdriver first appeared in 79ace1ab86SFrancois Tigeot.Fx 5.3 . 80ace1ab86SFrancois Tigeot.Sh AUTHORS 81ace1ab86SFrancois Tigeot.An -nosplit 82ace1ab86SFrancois TigeotThe 83ace1ab86SFrancois Tigeot.Nm 84ace1ab86SFrancois Tigeotdriver was written by 85*b2a6f486SFranco Fichtner.An Wm. Daryl Hawkins Aq Mt dhawkins@tamu.edu 86ace1ab86SFrancois Tigeotof Texas A&M University and 87*b2a6f486SFranco Fichtner.An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org . 88ace1ab86SFrancois TigeotThis manual page was written by 89*b2a6f486SFranco Fichtner.An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org . 90