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C6678,一直cache不到内存区域?



现在做的项目用的是C6678的芯片,然后通过板子上的FPGA用SRIO写到DSP的L3上的内存里面(采用pingpang结构),从0x0C2E000408(ping)开始有一段地址区间一直cache不到,后面加了Cache_Inv操作也没有作用,请问怎么解决啊?