Artesyn COMX-P2020 BSP User Guide (July 2014) - Manual (Page 48)

U-boot Deployment
COMX-P2020 BSP User Guide (6806800L84B) 48
5.4.1 UART
The P2020 consists of two universal asynchronous receiver/transmitters (UARTs). The UARTs
act independently; The UART#1 acts as the standard input and output device at U-boot; the
UART#2 is not used at U-boot, but the command: func testuart1 can be used to test UART#2 at
U-boot:
1. Connect the UART#2 to another serial port of PC;
2. Connect another terminal to the board's serial console port UART#2 with a baudrate of
115200 8n1n.
3. Run the command at the terminal to UART#1:
=> func testuart1
Please test at UART1, press 'q' to quit:
4. Enter any character at the terminal to UART#2. You can see the character you entered at
the terminal, which means that the input to UART#2 can be outputted to UART#2.
5. Press 'q' at the terminal to UART#2, the UART#2 test will end successfully.