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am3359 中断问题

Other Parts Discussed in Thread: AM3359

用am3359的裸机中断入口地址是0x18?哪是不是说cmd里要把中向量表放在0开始的地址?

这个地址我是从手册上看到的。

但是,也在memory map里看到:

GPMC

0x0000_0000   0x1FFF_FFFF   512MB     8-/16-bit External Memory

如果这个地址没接上外部内存,我们怎么办呀?或者放在片外速度是不是慢了?

求专家讲解!!