1.\" Copyright (c) 1998,1999 Alex Nash 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $OpenBSD: wdt.4,v 1.15 2007/05/31 19:19:55 jmc Exp $ 26.\" 27.Dd $Mdocdate: May 31 2007 $ 28.Dt WDT 4 i386 29.Os 30.Sh NAME 31.Nm wdt 32.Nd ICS PCI-WDT500/501 watchdog timer device 33.Sh SYNOPSIS 34.Cd "wdt0 at pci?" 35.Sh DESCRIPTION 36The 37.Nm 38driver provides support for the Industrial Computer Source 39PCI-WDT500 and PCI-WDT501 boards. 40.Pp 41For PCI-WDT500 boards, basic watchdog timer functionality is supported. 42For PCI-WDT501 boards, the onboard buzzer will sound when the watchdog 43counter expires. 44The sensors are not yet supported. 45.Pp 46If the kernel crashes, the watchdog 47timer is not reset and the system will reboot (assuming a proper connection 48is made between the WDT50x and motherboard). 49Alternatively, the watchdog 50can be reinitialized via a userland process which ensures that process 51scheduling, not just kernel timeout processing, is still taking place. 52See 53.Xr watchdog 4 54and 55.Xr watchdogd 8 56for more information. 57.Pp 58The timer can be configured to have a timeout from 2 to 1800 seconds. 59.Sh SEE ALSO 60.Xr intro 4 , 61.Xr pci 4 , 62.Xr watchdog 4 , 63.Xr watchdogd 8 64.Sh HISTORY 65The 66.Nm 67driver first appeared in 68.Ox 2.6 . 69