背景：st mcu 编译，升级后，运行的时候出现jlink error:can not read register ....
推测：程序是带boot 和app 两部分，在不要boot情况下app程序没有从0x8000000开始运行
修改：因为现在是调试阶段，不需要boot，所以做出如下修改
a.把app运行的keil做如下修改：
b.main函数修改如下：
编译，升级，程序正常运行；
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