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引导函数中入口地址不对

1.如图所示,我这个引导函数的入口地址不对,请问这个问题有什么解决方法,我用的是28027芯片,是不是boot的引脚设置那边的硬件电路没有设置好,导致入口地址不对?

2,请问28027的boot loader模式是有哪几个引脚来设置的?

十分感谢