Hardware requirements

Board settings

No special is needed.

Connect 12V power supply and J-Link Debug Probe to the board, switch SW101 to power on the board
Connect a USB cable between the host PC and the J901 USB port on the target board.
Open two serial terminals for A53 core and M7 core with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
Using U-Boot command to run the demo.bin file. For details, please refer to Getting Started with MCUXpresso SDK for i.MX 8M Nano.pdf
After running the demo.bin, using the “boot” command to boot the kernel on the A core terminal;
After the kernel is boot, using “root” to login.
After login, make sure imx_rpmsg_tty kernel module is inserted (lsmod) or insert it (modprobe imx_rpmsg_tty).

After the boot process succeeds, the ARM Cortex-M7 terminal displays the following information:

RPMSG String Echo FreeRTOS RTOS API Demo...

Nameservice sent, ready for incoming messages...

After the Linux RPMsg tty module was installed, the ARM Cortex-M7 terminal displays the following information:

Get Messgae From Master Side : "hello world!" [len : 12]

The user can then input an arbitrary string to the virtual RPMsg tty using the following echo command on Cortex-A terminal:

echo test > /dev/ttyRPMSG30 log below shows the output of the RPMsg-Lite str echo demo in the terminal window:

On the M7 terminal, the received string content and its length is output, as shown in the log.

Get Message From Master Side : "test" [len : 4]
Get New Line From Master Side