Error: "another process waiting on open" message during boot up or when attempting to communicate with the port.


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Error: "another process waiting on open" message during boot up or when attempting to communicate with the port. Error: "another process waiting on open" message during boot up or when attempting to communicate with the port.

This is caused by the System booting faster than the ports can download their code and initialize. To solve the problem add:

		(
		until sleep 1 < /dev/ttya01
		do
		:
		done
		) 2> /dev/null

at the top of /etc/rc.d/8/userdef. If there are multiple devices, it may be prudent to replicate these commands for the first port on each device.