AM3354
Build UBoot
步驟如下：
$ cd $ git clone https://github.com/steward-fu/gh_cm3354_uboot.git $ git clone https://github.com/steward-fu/gh_bbgw_toolchain.git $ sudo cp -a gh_bbgw_toolchain/x64 /opt/am3354 $ export PATH=$PATH:/opt/am335x/bin $ cd gh_cm335x_uboot $ export ARCH=arm $ export CROSS_COMPILE=arm-linux-gnueabihf- $ make am335x_evm_config $ make -j4