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The Bananapi BPi-R3 board can boot from eMMC, SD card, SPI-NAND and SPI-NOR, depending on the position of switches controlling the BOOTSEL bootstrap pins as we as hard-wired chip-select lines. The position of the chip-select switch SW6 decides whether either SD card or eMMC can be accessed, SW5 selects either SPI-NAND or SPI-NOR. Generate U-Boot for all 4 boot options. The SD card version allows installation to SPI-NAND and SPI-NOR (eMMC cannot be accessed simultanously with the SD card), the SPI-NAND version allows installation to eMMC. Signed-off-by: Daniel Golle <daniel@makrotopia.org>