玩玩 Trainer-xM Board （Beagleboard-xM 的 expansion board）

Reference arrange  about  Trainer-xM Board:
------------------------------------------------------------------------------------------------------------

• http://webdelcire.com/wordpress/archives/997
• http://www.elinux.org/BeagleBoard_Trainer
• http://www.elinux.org/BeagleBoard_Trainer_Nunchuk
• http://makezine.com/2010/09/19/playing-with-the-arduino-compatible/
• https://www.facebook.com/note.php?note_id=10150130372674362
• Trainer Rev-b schematic

• Trainer Rev-A1 schematic