@agowa338 I really have no better idea than "observe what's missing and try to fill the gaps, then repeat". What needs to be done will be very different across devices, and you'll have to rely on having wide enough background knowledge to connect the dots.

Pretty much all existing ports, including Librem 5 and PinePhone, still have plenty of low hanging fruits to deal with. That's what you'd start with to get to know the stack. Also: browse the commits, especially those beyond your grasp *yet*.