# '''If there is no debugging serial port and no HDMI display, you can also check the IP address of the development board's network port through the router's management interface. However, in this method, some people often cannot see the IP address of the development board normally. If you can't see it, the debug method looks like this:'''

<li><p>'''First check whether the Linux system has started normally. If the three-color light on the development board is flashing, it is generally started normally. If only the red light is on, it means that the system has not started normally;'''</p></li>

<li><p>'''Check whether the network cable is plugged in tightly, or try another network cable;'''</p></li>