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Diffstat (limited to 'static/freebsd/man4/ichwd.4')
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diff --git a/static/freebsd/man4/ichwd.4 b/static/freebsd/man4/ichwd.4 new file mode 100644 index 00000000..25de7377 --- /dev/null +++ b/static/freebsd/man4/ichwd.4 @@ -0,0 +1,98 @@ +.\"- +.\" Copyright (c) 2007 Dag-Erling Smørgrav +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.Dd January 3, 2026 +.Dt ICHWD 4 +.Os +.Sh NAME +.Nm ichwd +.Nd device driver for the Intel ICH watchdog interrupt timer +.Sh SYNOPSIS +To compile this driver into the kernel, +place the following line in your +kernel configuration file: +.Bd -ragged -offset indent +.Cd "device ichwd" +.Ed +.Pp +Alternatively, to load the driver as a +module at boot time, place the following line in +.Xr loader.conf 5 : +.Bd -literal -offset indent +ichwd_load="YES" +.Ed +.Sh DESCRIPTION +The +.Nm +driver provides +.Xr watchdog 4 +support for the watchdog interrupt timer present on +all Intel ICH motherboard chipsets. +.Pp +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. +.Pp +In QEMU, there is a dedicated watchdog implementation for x86 +systems based on the Intel 6300ESB controller hub. +Support for this watchdog is provided by this kernel module. +.Pp +Optionally, set the +.Va hw.i6300esbwd.x.locked=1 +.Xr sysctl 8 +to prevent users from disabling the watchdog timeout check +after it has been enabled. +.Pp +Note that on some ICH-based systems, the WDT may be present but +disabled, either in hardware or by the BIOS. +The +.Nm +driver attempts to detect this condition and will refuse to attach if +it believes the WDT is disabled. +.Sh SEE ALSO +.Xr watchdog 4 , +.Xr watchdog 8 , +.Xr watchdogd 8 , +.Xr watchdog 9 +.Rs +.%T Using the Intel ICH Family Watchdog Timer (WDT) +.%R Intel Application Note AP-725 +.%O Document Number 292273-001 +.Re +.Sh HISTORY +The +.Nm +driver first appeared in +.Fx 5.3 . +.Sh AUTHORS +.An -nosplit +The +.Nm +driver was written by +.An Wm. Daryl Hawkins Aq Mt dhawkins@tamu.edu +of Texas A&M University and +.An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org . +This manual page was written by +.An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org . |