[Bug 193758] either gptzfsboot or zfsloader hangs during boot after kernel and pool upgrade

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193758

--- Comment #2 from mark at exonetric.com ---
I've someone e-mail me indicating they had the same issue and that using the
gptzfsboot code from the 9.2 release resolved the issue. I've not yet had a
chance to try that, but as far as I can tell the only difference in zfsboot
between 8.4 and 9.2 were a couple of lines relating to serial console handling,
suggesting like the forum comment that gptzfsboot is hanging in some serial
console related code.

So, if this is the root of the issue I would guess that some serial console
code for boot loaders changed between 8.2 and 8.4, but that zfsboot, at least
wasn't updated until 9.2 or earlier.

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