This is the OS currently running on my SBCs:
All that is needed is a suitable firmware that can start the OS and usually an up-to-date mainline kernel with in-flight patches added, because SoC development is bleeding edge if you don’t want to use manufacturer-legacy code.
But the RK3568 SoC support is already quite mature and recent kernels are almost usable out-of-the-box.
And the mainline firmware source code is usually already available.
For me, it is only necessary to build the firmware, since it cannot be supplied by fedora because of manufacturer license conditions and then I’m ready to go.
I rebuild the kernel regularly anyway to follow the current development.
Everything else is recent native standard aarch64 OS software, nothing device-specific.