Please ignore comment #7. The board couldn't enter the suspend mode because I set stay awake in development options. Now after disable that, the board can enter the suspend mode but can't be woken up, leaving a dead serial console, same as comment #3.
Please ignore comment #7. The board couldn't enter the suspend mode because I set stay awake in development options. Now after disable that, the board can enter the suspend mode but can't be woken up, leaving a dead serial console, same as comment #3.