本文探讨了不同MMU配置下ELF映像符号地址的含义及其实际加载和执行地址的区别。首先介绍了在没有MMU的情况下，物理地址即为加载执行地址。接着分析了MMU开启前后虚拟地址与实际地址的转换过程。最后讨论了MMU启用时如何直接在虚拟地址上进行加载和执行。
1. NOMMU, The physical address in the ELF image symbol is just address for loading and executing.
2. MMU ,but not enable at the beginning, The address of symbol is virtual address, but the real address is different.So we need to load the image to its real address, and executing at its real address.
3.MMu and enabled, we can load the image to its virtual address, and executing at its virtual address.
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