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请参考一下http://processors.wiki.ti.com/index.php/DM816x_C6A816x_AM389x_DDR3_Init以及http://processors.wiki.ti.com/index.php/EZSDK_Memory_Map
另外,你改变DDR的大小是去掉一半DDR(去掉一个DDR EMIF 还是每个EMIF各去掉一半)还是每片DDR的容量减少一半?