Tested on BananaPi R2 (SD, eMMC), BananaPi R64 (SD, eMMC, SPI-NAND) and UniElec U7623-02 (eMMC). Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Brings bootmenu and production/recovery dual-boot scheme like on the BPi-R2, BPi-R64, E8450 and UniFi 6 LR. Signed-off-by: Daniel Golle <daniel@makrotopia.org>