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ichwd: Add manual for i6300esb watchdog

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Reviewed by:    ziaee, mhorne
Approved by:    lwhsu (mentor)
MFC after:      2 weeks
Sponsored by:   The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D54466
This commit is contained in:
ShengYi Hung
2026-01-03 14:12:26 +08:00
parent 31c3cba807
commit 546d925cb4
1 changed files with 11 additions and 1 deletions
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share/man/man4/ichwd.4
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@@ -23,7 +23,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE. .\" SUCH DAMAGE.
.\" .\"
.Dd August 20, 2008 .Dd January 3, 2026
.Dt ICHWD 4 .Dt ICHWD 4
.Os .Os
.Sh NAME .Sh NAME
@@ -55,6 +55,16 @@ The ICH WDT counts down in ticks of approximately 0.6 seconds; the
exact value depends on hardware quality and environmental factors. exact value depends on hardware quality and environmental factors.
Supported watchdog intervals range from 2 to 63 ticks. Supported watchdog intervals range from 2 to 63 ticks.
.Pp .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 Note that on some ICH-based systems, the WDT may be present but
disabled, either in hardware or by the BIOS. disabled, either in hardware or by the BIOS.
The The