10 Can Linux configure the serial devices automagically?

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Yes. To get Linux to detect and set up the serial devices automatically on startup, add the line:

/etc/setserial /dev/cua0 auto_irq skip_test autoconfig
to your /etc/rc.local or /etc/rc.serial file. Do this for every serial port you want to auto configure. Be sure to give the correct location of where your setserial program lives, and give a device name that really does exist on your machine.

10.1 Notes for multiport boards

For board addresses, and IRQs, look at the rc.serial that comes with the setserial program. It has a lot of detail on multiport boards, including I/O addresses and device names.

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