Opening /dev/cuau1 works successfully; incoming data arrives and is
read just fine. stty verifies parameters normally, and this is a
standard serial port on real hardware (no USB or anything else involved
Any attempt to write to /dev/cuau1 while open causes the system to hang;
it returns ping and completes 3 way handshakes but is unresponsive via
ssh and on console.
Same cabling, same configuration works on another OS. Levels have been
verified with a digital volt meter, and RS232 analyzer.
How-To-Repeat: 100% repeatable with either my build or GENERIC from boottime.
For bugs matching the following criteria:
Status: In Progress Changed: (is less than) 2014-06-01
Reset to default assignee and clear in-progress tags.
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