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

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

--- Comment #11 from christi@coraline.org ---
I don't think any of the other qemu watchdogs are suitable.  The diag288 driver
is for the IBM System 390 mainframe architecture, and I certainly wouldn't
expect it to be supported on AMD64 (it's also not listed as an option in the
production version of qemu I'm using running under Proxmox 6.4).

I have tried the ib700, but it is an ISA watchdog even older than the i6300esb
and will not attach to my VM with a virtual PCI bus.  I think it's unlikely
FreeBSD will support that even if I could get it working.  It does not appear
in the list of ichwd supported watchdogs.

While I appreciate it's old physical hardware, it appears to have become the de
facto qemu standard watchdog, and I don't think it's a particularly niche use
case given that.  If I had the skills to write a driver myself, I'd be tempted
to give it a go, but I think I have to acknowledge it's beyond my capabilities.

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