I made a board based on Freescale's Sbare development board(MCIMX6Q-SDB),almost all the circuits are same,when I connect the board to the pc‘s usb port by otg wire ,MFG tools cant find the board, the host's device manager also cant find the board,NOW I know the OTG wire have no ploblem, I had tested the Voltage of the otg circuit,the usb_otg_vbus is 5V. and I don't know where the problem is.