Merge update from ...xiaolu:master 

change1: https://github.com/xiaolu/mkbootimg_tools/commit/0207edde9076ceb9822b0a70d5e04532aed5a9de

chage2: https://github.com/xiaolu/mkbootimg_tools/commit/50c0c51f04c958dd753b4e7536db689a84e0d712

chage3: https://github.com/xiaolu/mkbootimg_tools/commit/82937c8f669e931a35799a463defea3150089cfd