Date: Wed, 04 Mar 2026 13:51:33 +0000 From: ShengYi Hung <aokblast@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 546d925cb44f - main - ichwd: Add manual for i6300esb watchdog Message-ID: <69a838e5.2253b.58682e0f@gitrepo.freebsd.org>
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The branch main has been updated by aokblast: URL: https://cgit.FreeBSD.org/src/commit/?id=546d925cb44f1da7efee76bfebb42df8fdbc83a8 commit 546d925cb44f1da7efee76bfebb42df8fdbc83a8 Author: ShengYi Hung <aokblast@FreeBSD.org> AuthorDate: 2026-01-03 06:12:26 +0000 Commit: ShengYi Hung <aokblast@FreeBSD.org> CommitDate: 2026-03-04 13:51:13 +0000 ichwd: Add manual for i6300esb watchdog Reviewed by: ziaee, mhorne Approved by: lwhsu (mentor) MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D54466 --- share/man/man4/ichwd.4 | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/share/man/man4/ichwd.4 b/share/man/man4/ichwd.4 index cc6924f7f866..25de73778d36 100644 --- a/share/man/man4/ichwd.4 +++ b/share/man/man4/ichwd.4 @@ -23,7 +23,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd August 20, 2008 +.Dd January 3, 2026 .Dt ICHWD 4 .Os .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. 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. Thehome | help
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