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Terminal and Serial Output

Accessing the Terminal

Connecting via TTY

Connect your host PC to the board's micro-USB port. This is a virtual port serving as a terminal. The board does this by connecting to a TTY.

Info

You can find more background info on TTYs and Linux here:

Install minicom:

sudo apt-get install minicom
  • The board has two TTY sessions.
  • ttyS0 corresponds to standard UART.
  • ttyACM0 corresponds to the STLink interface.

Connect to the STLink interface through the board's TTY file:

sudo minicom -D /dev/ttyACM0

Tip

If ttyACM0 is not the correct file, check the files in the /dev/ directory before and after the board's micro-USB is plugged in to detect the correct file.

By default, STLink is running with a baud rate of 115200. minicom also has this baud rate by default. But, if configuring the settings is ever necessary, do so using the sudo minicom -s command.

Press the RESET button, and you will see serial output containing bootup information.

Bootup Serial Output

Press Enter and you will be given a terminal prompt looking something like root@stm32mp1:~# where you can run some commands.

Hi STLink Terminal

For more information on the board's TTY, check ST's How to Use TTY with User Terminal page.

Connecting via SSH

  • Ensure the device is connected to a network through Ethernet or a wireless receiver.
  • Determine the device's assigned IP address.

Remotely access the device: 

ssh root@[ip address]

Here, root is used as there are no default user accounts on the custom Linux image.

Reading Serial Output

Follow a process similar to the one described in Connecting via TTY. This time, connect to ttyS0.