http://www.cnblogs.com/tangbomao/p/6649051.html
联想ThinkPad开机只有boot menu 和application menu
https://zhidao.baidu.com/question/1962052501644606020.html
https://zhidao.baidu.com/question/814399779396083892.html
原文：https://www.cnblogs.com/sunyuhuan/p/10303311.html