Hardware requirements

• Micro USB cable

• EVK-MIMX8M Plus board

• J-Link Debug Probe

• SD card with uboot

• 12V power supply

• Personal Computer

Board settings

No special settings are required.

Prepare the Demo

1. Prepare an SD card with the prebuilt U-Boot image. Then, insert the SD card to the target board.

2. Connect a USB cable between the host PC and the J23 USB port on the target board.

3. Connect 12V power supply and J-Link Debug Probe to the board, switch SW3 to power on the board

4. Open a serial terminal with the following settings:

   • 115200 baud rate

   • 8 data bits

   • No parity

   • One stop bit

   • No flow control

5. Download the program to the target board.

6. Launch the debugger in your IDE to begin running the demo.

Running the demo

Follow the output log, lock and unlock the sema4 gate in uboot. The whole log:

SEMA4 uboot example start
Lock sema4 gate in uboot using:
 > mw.b 0x30ac0000 1 1
Unlock sema4 gate in uboot using:
 > mw.b 0x30ac0000 0 1
SEMA4 uboot example success