Android PandaBoard: Linux terminal output for debugging?
See this link for the general idea.

For verification, do the following steps:


Connect DB9 to your host (PC) &lt;------> Panda board (target). You need to connect with minicom and mini USB for adb shell.
pc$ sudo minicom
You should have adb shell for the Android SDK.
pc$ export PATH=$PATH://android-sdk-linux/platform-tools
Reboot the panda board.
pc$ adb devices # to check the device is connected or not
pc$ adb reboot   # to reboot


On minicom terminal, you will get logs of the reboot. At the end, it will ask you to hit a key to stop auto boot. This will tell you if the device is getting the image or not. If you want to boot manuually by using U-Boot terminal, press key so you will get U-Boot terminal.

 hardware_name# bootm 


This will help you a little bit.