Fan Control:
git clone https://github.com/pymumu/fan-control-rock5b
cd fan-control-rock5b
make package
sudo dpkg -i fan-control*.deb
sudo systemctl enable fan-control
systemctl start fan-control
https://github.com/pymumu/fan-control-rock5b
Or https://github.com/XZhouQD/Rock5B_Naive_Pwm_Fan