Obviously the serial driver does grab the interrupt
at open time, but grabs the io region at load time.
Or is there a newer version of the serial driver somewhere?
You're right, I was wrong. Yes, the serial driver does reserve the io
region to prevent other drivers from trying to use that port.
If you want to let another device driver use that serial port, use
setserial to change the uart to be "none". This will prevent the serial
driver from using that port, and it will release the i/o region, thus
allowing another device driver to use that port.
- Ted