Set up the working environment

Use Serial Console

USB to TTL serial cable

Each pin of a USB-to-TTL cable is defined as follows:

Connection

Take using Raspberry Pi CM4 IO Board as the base-board as an example, connect USB to TTL serial cable as shown below. Do not connect the red wire.

Milk-V Mars	<--->	USB to TTL
GND (pin 6)	<--->	Black wire
TX (pin 8)	<--->	White wire
RX (pin 10)	<--->	Green wire

The default serial setting for Mars console is:

baudrate: 115200
data bit: 8
stop bit: 1
parity  : none
flow control: none