[Bug 259673] ichwd does not detect qemu i6300esb virtual watchdog

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259673

Ed Maste <emaste@freebsd.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open
                 CC|                            |emaste@freebsd.org

--- Comment #10 from Ed Maste <emaste@freebsd.org> ---
(In reply to christi from comment #9)

This would be a bespoke driver, not a port of the Linux driver (although
perhaps done by using the latter as a reference). As the Linux driver is only
about 200 LOC it seems like this would be a fairly straightforward endeavour.

That said, this is quite old hardware - I am surprised QEMU does not offer
other usable watchdogs.

From qemu(1) I see:

       -watchdog model
              Create a virtual hardware watchdog device. Once enabled (by a
              guest action), the watchdog must be periodically polled by an
              agent inside the guest or else the guest will be restarted.
              Choose a model for which your guest has drivers.

              The model is the model of hardware watchdog to emulate. Use
              -watchdog help to list available hardware models. Only one
              watchdog can be enabled for a guest.

              The following models may be available:

              ib700  iBASE 700 is a very simple ISA watchdog with a single
                     timer.

              i6300esb
                     Intel 6300ESB I/O controller hub is a much more
                     featureful PCI-based dual-timer watchdog.

              diag288
                     A virtual watchdog for s390x backed by the diagnose 288
                     hypercall (currently KVM only).

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