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IBL是一个中间加载的程序，相当于二级加载。使用SPI nor flash的话，RBL支持一级SPI flash加载，不需要经过二级加载的过程。关于SPI flash加载过程参考bootloader user guide，SPI flash加载例程参考：http://www.deyisupport.com/question_answer/dsp_arm/c6000_multicore/f/53/t/46608.aspx
