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AM3352的GPIO2和GPIO3寄存器不能访问,不知是何原因。

我遇到的现象是GPIO2(基地址0x481AC000)和GPIO3(基地址0x481AE000)的相关寄存器读写操作均不能进行,程序会卡在那里,而GPIO0和GPIO1可正常操作,请问是什么原因会导致这种情况?