echo "prepare_env ..."
sh prepare_env.sh
-export PATH=$PATH:/opt/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu/bin:/opt/aarch64--uclibc--stable-2020.08-1/bin
+export PATH=$PATH:/opt/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu/bin:/opt/aarch64--uclibc--stable-2020.08-1/bin:/opt/mips-loongson-gcc7.3-linux-gnu/2019.06-29/bin/:/opt/mips64el-linux-musl-gcc730/bin/
echo "build grub2 ..."