Can someone help me with this?
Unfortunately I’m newbie in kernel edit and Linux compilation so I ask for help from enthusiasts with an already configured environment.
Enthusiasts are also asking for your help: https://www.armbian.com/newsflash/armbian-needs-your-help/
There are “1000 people” waiting in the line for a small favour … Thought about that?
Alternatively you can make a pull request and collect kernels from artefacts. Example:
But that will not fix u-boot problem. tl;dr; Use a tool and donate to support its maintenance. It saves you days of your - I assume - precious time.