I have a IBM Thinkpad T21 that I'm having trouble locating the serial port on. I tried to run minicom and it failed to start, with the error: "cannot open /dev/cuau0". I also don't see ttyu* in /dev either. I also get no output when I type: "dmesg | grep uart". Do I need to do something to my /boot/device.hints file? If so could you point me to a guide to what to put in there?