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Dependencies for sdcard flashing.

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Bootloader:

               Bananapi Bananapi r4 follows a atf (arm-trusted firmware) flow for device bootup, by default flash memory is present in the device (BL1), and bl1 is depended on bl2 address which flow is mentiond below.which will be loaded with BL1  and BL1 will be having bl2 address to load bl2 and make device up.

Device bootup flow as mentioned below 

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