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程序的CMD所有内存都分配到DDR中，那我boot的时候是不是必须需要先初始化DDR？怎么样初始化DDR呢？
可以配置DDR configuration table，具体参数参考数据手册。2.5.3.8 DDR3 Configuration Tablehttp://www.ti.com/lit/ds/symlink/tms320c6678.pdf参考下面的c6657例程。http://processors.wiki.ti.com/index.php/KeystoneI_Bootloader_Resources_and_FAQ#Direct_Boot_Examples_.28without_IBL.29
