Orange Pi R1 Plus - Ethernet Port Test; Lan Port Test

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Uncompressing Linux... done, booting the kernel.
Orange Pi 2.1.0 Focal ttyS0
orangepi login:
2) When there is a problem with the linux system startup, you can use the following
method to modify the value of loglevel, so as to print more log information to the serial
port for debugging. If the Linux system fails to start and cannot enter the system, you can
insert the TF card into the Ubuntu PC through a card reader, and then directly modify the
configuration of the linux system in the TF card after mounting the TF card in the Ubuntu
PC. TF card inserted into the development board to start
root@orangepir1plus:~# sed -i "s/verbosity=1/verbosity=7/" /boot/orangepiEnv.txt
root@orangepir1plus:~# sed -i "s/console=both/console=serial/"
/boot/orangepiEnv.txt
3) The above commands are actually to set the variables in /boot/orangepiEnv.txt. After
setting, you can open /boot/orangepiEnv.txt to check
root@orangepir1plus:~# cat /boot/orangepiEnv.txt
verbosity=7
console=serial
4) Then restart the development board, the output information of the kernel will be
printed to the serial port for output
5.6. Ethernet port test
5.6.1. Lan Port Test
1) First, plug the network cable into the onboard Ethernet interface of the development
board, and ensure that the network is unblocked