Apart from monitoring the boot process and checking Linux kernel messages for debugging, you can login to the board through the UART. The configuration parameters of the UART are shown in the following example. A screenshot of a sample boot is shown in the following figure. Login into the system with username “root” and password “root”.
- baud rate: 115200 bps
- data bit: 8
- stop bit: 1
- no parity
Figure 1. Example of Boot Process
Note: On a Linux system, you can use Minicom to connect to the target board directly; for a Windows system, a USB to UART driver is needed before connecting to the board through a serial port.