your question is a little bit similar to this one https://dietpi.com/forum/t/how-does-the-dietpi-v8-4-u-boot-works-for-xu4/6589/1
your question is a little bit similar to this one https://dietpi.com/forum/t/how-does-the-dietpi-v8-4-u-boot-works-for-xu4/6589/1