[Bug 241768] Serial port hang on Raspberry PI arm64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241768

            Bug ID: 241768
           Summary: Serial port hang on Raspberry PI arm64
           Product: Base System
           Version: 12.0-STABLE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: ian at niw.com.au

If data is sent to the raspberry pi serial port immediately after boot and
before any data is output the serial port will often hang up completely.
Attempts to output will stall. No input can be received. If anything is output
before the first data is received by the port it all works fine.

In all my tests one character is received, after this nothing more can be input
or output.

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