Bugs caused by Structure Design

BUG: The assembled imx6 board. After the device is restarted, it stays in uboot and cannot be started into the Android system.

While dismounting, my colleague saw that the Board had a broken pin and met another one. Therefore, the pin is corrected, and the Board works properly.

Then observe the shell structure of the Board, and there is a screw hole on the side of the distorted pin. So suddenly, the whole bug process is like this ---

1. When the board is installed, the screw holds a pin, which is the serial port TX pin of uboot.

2. After the Tx pin of the uboot serial port is topped, it is tied to the pin next to it. This is the RX pin of uboot.

3. When uboot is started, all data written to TX is sent back to the RX pin intact.

RX receives data .. When uboot is started, doesn't press any key enter the uboot command line mode. As a result, the subsequent Android operating system will not be available.

(Reprint please mark: http://www.cnblogs.com/xhawk18)