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A major fix that was found when testing at FLAB, is that if . Because the CTS line into the DSM was allowed to float,then it generates interrupts if it is run through generated interrupts over a long cable. They occur when the TX line from the Licor is active, so it must be some sort of cross talk. It is not simple to disable CTS interrupts in the kernel. So Instead, the CTS to the DSM was looped back into to RTS from the DSM in the Licor box and not allowed to float. The Licor CTS from the licor was already looped back to its RTS in its box. So now the box, so this is a symmetrical loopback is done at the licor end of the cable on the CTS/RTS signals from the DSM.
We shouldn't see any of the "spurious interrupt" messages - primarily because the kernel now doesn't complain about them, but also since we are not getting the storm of CTS interrupts, then things should be much more predictable.