Using
    http://linux-sunxi.org/FEL/USBBoot
to boot
    https://github.com/ssvb/sunxi-bootsetup/releases/tag/20141215-sunxi-bootsetup-prototype

Compiling 'u-boot-spl.bin' and 'u-boot.bin':
    git clone -b 20141215-sunxi-bootsetup-prototype https://github.com/ssvb/u-boot-sunxi.git
    cd u-boot-sunxi
    patch -p1 < ../u-boot-patch.patch
    make CROSS_COMPILE=arm-none-linux-gnueabi- sunxi-generic-a10-a13-a20_FEL_defconfig
    make CROSS_COMPILE=arm-none-linux-gnueabi- -j2