How to use serial console to set up the board?

yehnan
yehnan New Member Posts: 16
In the document
https://up-community.org/wiki/Setup

it says:
or, to use the board through serial console:

What does the sentence mean? I don't quite understand.
I know that using the serial cable can log in the system.
But can I use it to install ubilinux? without using USB drive.