I was about to install debian on my sheevaplug. Since I was going to do it from an usb stick, I had to upgrade my UBoot. I followed the instructions from http://www.cyrius.com/debian/kirkwood/sheevaplug/uboot-upgrade.html. I did a reset and verified my UBoot indeed got upgraded.
However, after that one time....I have not been able to access the serial port on my sheevaplug. I get no output whatsoever. Any ideas?