U-Boot

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Compiling Uboot

         git clone https://github.com/crust-firmware/arm-trusted-firmware/

         cd arm-trusted-firmware

         CROSS_COMPILE=aarch64-linux-gnu-

         export CROSS_COMPILE

         export ARCH=arm64

         make PLAT=sun50i_a64 bl31

         cp build/sun50i_a64/release/bl31.bin ../u-boot/

         cd ..