Connect to UART Port

Most Genio evaluation kits and development boards have the UART0 port connected to an UART-to-USB chip, such as FTDI-232 on Genio 350-EVK, which expose the UART serial console as an USB serial device to your host PC.

Port Location

On Genio 350-EVK it is labeled as UART0.
On Genio 510/700-EVK it is labeled as UART0.
On Genio 1200-EVK Board it is labeled as UART0.

For other development boards, you might want to check which port the UART0 is connected to in the user guide or schematics of the board.

Baud Rate and Consoles

The UART0 port allows you access bootloader and kernel console. Note that different baud rates are used for different purposes:

Console Baud Rates
Console	Baud Rate	Purpose
Download Agent	921600	Download progress log from download agent (`lk.bin`) when using `genio-flash`
Boot ROM	115200	SoC boot ROM logs and messages
Bootloader Console	921600	U-Boot console for debugging and boot configurations
Kernel Console	921600	kernel messages and console

Note: UART0 and USB0 can connect to the board simultaneously. UART0 get BROM and kernel console logs. USB0 is used to flash the image to the board.

Settings other than baud rate are the same between bootloader and kernel console:

Data Bits: 8
Stop Bits: 1
Parity: None
Flow control: None

Connect to UART on Linux

You can now connect to the UART using the following command:

picocom -b 921600 /dev/ttyUSB0

or using

screen /dev/ttyUSB0 921600

Note

Depending on your system, you may have more than one USB serial device connected, which means the board might not be presented as /dev/ttyUSB0 in your system. In this case, please try other ttyUSB devices (i.e. /dev/ttyUSB1, /dev/ttyUSB2, etc.)

Connect to UART on Windows

After driver installation, you can use serial terminal programs to connect to COM ports, such as: