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FFTC_simple_testProject代码问题



在FFTC_simple_testProject工程的test_main. c文件的118行开始有如下代码不懂其作用,麻烦大家帮我解读一下哈,谢谢了。

#undef  L2_CACHE  

#define MAPPED_VIRTUAL_ADDRESS      0x81000000

/* MPAX segment 2 registers */

#define XMPAXL2                     0x08000010

#define XMPAXH2                     0x08000014

这里的MPAX segment是干什么的?