S5P6818
Build UBoot
步驟如下：
$ cd $ git clone https://github.com/steward-fu/nanopi-m3_toolchain $ sudo mv nanopi-m3_toolchain /opt/m3 $ git clone https://github.com/steward-fu/nanopi-m3_kernel $ cd nanopi-m3_kernel $ make nanopi3_linux_defconfig $ make uImage