martinayotte's post in Proper way to test a customized kernel was marked as the answer
There is no "special" boot configuration since U-Boot rely on the 3 symbolic links which point to proper Image/uInitrd/dts .
It is possible, but then you have to manually install every things and create the symbolic links as well as creating uInitrd using "mkimage".
It is much more easier to use Armbian DEBs ...
martinayotte's post in OrangePi One Plus (H6) - SPI Enabled but not communicating. was marked as the answer
After hours of investigation, and after having figured out that SPI for H6 wasn't working since 5.7.x, I've found why : missing SPI pins in DT ...