Setting the CPU frequency

Development and Programming Low Level Development
2

You can refer how to set the cpu freq from command line:

https://software.intel.com/sites/default/files/comment/1716807/how-to-change-frequency-on-linux-pub.txt

How to overclock the ROCK Pi 4B to 2Ghz:

Is it possible to overclock the Rock Pi 4? - #39 by stuartiannaylor