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

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

--- Comment #4 from Andriy Gapon <avg@FreeBSD.org> ---
I made a quick look at Linux code and there is an interesting thing.
Linux has drivers/watchdog/iTCO_wdt.c driver which is roughly equivalent to
FreeBSD ichwd and works approximately the same.  It's a "platform" driver and
its configured via an LPC driver.
But additionally there is drivers/watchdog/i6300esb.c driver specifically for
6300ESB watchdog.  It attaches directly via PCI.

I am not sure if in the case of 6300ESB Linux has two drivers for the same
hardware or if the hardware actually has multiple watchdogs...

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