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Hmm, I'm still not having any luck. I've soldered in three wires to the RX, TX, and GND pins. I've killed off the shell using /dev/ttymxc0 and I've renamed the character device so that the shell doesn't reopen it.
How: lsof | grep ttymxc0 to get the shell's PID
mv /dev/ttymxc0 /dev/fred
kill -9 shell's PID
microcom -s 115200 /dev/fred
I did a loopback test using microcom and wiring the TX and RX lines together. I didn't see anything. I've tried a bunch of different speeds with no luck. I'm starting to suspect that the device is powered down, based on this line in init.freescale.rc: write /sys/devices/platform/imx-uart.0/tty/ttymxc0/power/wakeup disabled
I did echo enabled > /sys/devices/platform/imx-uart.0/tty/ttymxc0/power/wakeup but that didn't change anything.
Anyway, I don't think that anybody can help me out, so this post is just a "marker" in case someone else travels down this path.
Cheers all & thanks Booxtor for the information.
Warren
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