The openwrt version is:
There is also a
Are you stuck here, what is the reason?
Is the location I picked up wrong?
Light cat --> routing --> Raspberry Pi
I connected the light cat directly to the Raspberry Pi 3. No, it’s all stopped here.
What is the reason?
The boot completed.
That looks like a normal end of the boot process (like shown in the wiki as Rpi3 boot log).
But as Rpi3 is a single-ethernet-port device, connecting to it might be difficult.
You should read the wiki articles about Openwrt and Rpi.