Images for non LTS version can be downloaded here
Legacy kernel based images are using improved and updated stock kernel. If you care that things works (wireless, Bluetooth, CPU frequency scaling, power off, reboot, …) but it uses proprietary boot loader and it comes without our support, use it. Mainline kernel has experimental support only
USB3 sometimes doesn’t detect high-speed devices properly
PCIe port is not supported: Allwinner H6 has a quirky PCIe controller that doesn’t map the PCIe address space properly to CPU, and accessing the PCIe config space, IO space or memory space will need to be wrapped. As Linux doesn’t wrap PCIe memory space access, it’s not possible to do a proper PCIe controller …
Serial console is enabled by default on µUSB
