On "REV A" boards, USB works with power from any available source. Connect the USB cable to the main board: the ports on the debug board are not connected for USB.
For revisions prior to "REV A", including numbered revisions, power must be supplied either through the AC connector on the main board or from the battery connector, also on the main board. If you plug the AC adaptor to the debug board, USB will not work.
Hardware configuration in which USB OTG port will work:
AC power connected to main board, Battery connected to main board.
NOTE: USB won't work if the power is connected to the debug board. Connect debug board before connecting power.
(For the first lot of boards, Battery should be above 2V. This is fixed on final set of production boards. All boards before March,09 are first lot borads.)
Debug USB port remains at the same place J12 on debug board.
MUSB OTG port is located on the Main board.
Use the latest u-boot and x-loader as mentioned in the getting started on zoom2 guide.
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