说明：  这主要是我个人通过网上的一些人的总结和我自己的经验写的关于ARM的JTAG通过并口下载BOOT时出现CPU检测不到的问题的一些方法！！！
(This is mainly my own through an online summary of some of the people and my own experience to write about ARM-JTAG download BOOT through a parallel port when CPU does not detect some of the ways the problem! ! !)