[Bug 235016] ASIX AX99100 based uart controllers broken on 12.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235016

            Bug ID: 235016
           Summary: ASIX AX99100 based uart controllers broken on 12.0
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rozhuk.im at gmail.com

I have ASIX AX99100 uart/serial controller with 2 ports, it works on 11.2 and
don't work on 12.0 - no data received.
It used for communicate with old APC smart, by sysutils/apcupsd.

Also, I'm not sure that FreeBSD bug, but on ryzen platform (x370 taichi +
1300x) system freeze (and not respond until reset) with this controller after
10-20 minutes.
On AM1 based platform no freeze.

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