Pine64 has a bunch of well-supported SBCs, some of which (Rockpro64) include a PCIe port, for instance. I think beagleboard was in the business even before the

Pine64 has a bunch of well-supported SBCs, some of which (Rockpro64) include a PCIe port, for instance. I think beagleboard was in the business even before the pi foundation, but I don't think they care about mainlining as much as the pine64 community.