u-boot 2015.01 from Amlogic buildroot.
makefile requires toolchain gcc-linaro-aarch64-none-elf-4.8-2013.11_linux located in /opt
To build u-boot.bin for a board: ./mk "boardname"
added board: gxl_libretech_cc (Le Potato) -> Current configuration loads /boot/boot.scr from an ext4 partition and executes it.