[Xenomai] Only 2 serial ports at a time with xeno_16550A driver

C Smith csmithquestions at gmail.com
Tue May 22 08:09:51 CEST 2018

I installed a Moxa 4 port PCI serial card, which has a shared interrupt for
all 4 ports.
I did this:
modprobe xeno_16550A io=0xd040,0xd048,0xd050,0xd058 irq=17,17,17,17

This worked fine, I was able to communicate bidirectionally on all four
ports in sequence, indicating that my kernel and xeno_16550A module are
compiled correctly for shared interrupts. I'll try simultaneous use of
these ports tomorrow.

The previous problem must have been the actual serial ports I was using,
which are the ones provided by the motherboard.

-C Smith

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