gcc linaro6.3.12017.02x86_64_aarch64linux gnu.tar.xz 用于给h5交叉编译 http://wiki.friendlyarm.com/wiki/index.php/Building_U-boot_and_Linux_for_H5/H3/H2+/zh#.E4.B8.BAH3.2FH2.2B.E7.BC.96.E8.AF.91Linux-4.14_BSP