[Bug 243225] "mpr0: Out of chain frames" boot hang after clang 9.0.1 import (probably timing, not compiler related)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243225

--- Comment #10 from Terry Kennedy <terry-freebsd@glaver.org> ---
(In reply to Peter Eriksson from comment #9)

It is timing-related, so is is more or less likely to happen depending on the
combination of hardware in the system, version / optimization level of the
compiler being used, number of CPU cores / threads, etc. As I mentioned when I
opened the PR, Dell Service moved the card from one slot to another and the
problem (temporarily) went away.

The "Out of chain frames" message is likely a red herring - something is
happening on the card or system that causes card initialization to think we
have no chain frames, possibly because the card hasn't finished initializing
yet.

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