The DE10-nano board has console port. The console allows you to login into Linux without a network connection and also provides some debug/info which sometimes useful to track the problems.
Refer to the UART-to-USB (USB Mini-B) connector on the board right side in the picture below:
Connect with Windows
Connect the DE10-nano board to a PC using the UART-to-USB (USB mini type B) connector next to micro-USB. The PC will recognize it as virtual COM port. Use any console application to connect to this COM port. I recommend Putty.
Verify that COM port settings are correct:
- Speed (baud rate) - 115200 bits per second
- Data bits - 8
- Stop bits - 1
- Parity - none
- Flow control - none
Here's a quick video for connections on Windows:
- Be sure to be a member of the dialout group.
- Your serial port is likely to be /dev/ttyUSB0
- Configure it:
$ stty -F /dev/ttyUSB0 115200 cs8 -cstopb -parenb -ixoff -ixon
- Look at the output while dumping it to a file:
cat /dev/ttyUSB0 | tee mr.log
Now mr.log has a copy of all the information shown in the screen.
U-Boot command prompt
To interrupt u-boot and get into the u-boot command prompt once connected to the DE10-Nano, hold 'ESC' on the PC and then power on or reboot the Nano (using the reset button). Startup should be interrupted and you should see a '=>' prompt. Here you can edit the kernel boot options etc.