Description: SONY CDU-31a CD
 cdu31a_port=0x000
 cdu31a_irq=0

This driver doesn't auto-configure when loaded from a module.
You must set cdu31a_port=<hex-number> in the arguments. This driver won't
load unless you do that. The drive won't use interrupts unless you set
cdu31a_irq, so it's advised you do that as well.
