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HPI on DM648

Hi! I'm debugging the hpi of DM648. if the program of the DSP is below:

unsigned char array[2048];//the address is 0xe8000000 when running,this address is located in DDR2

int main()

{

 memset(array, 0x45, 2048);

}

the host reading or writing the address of array(0xe800 0000 - 0xe800 0800) is failed, while accessing other address is OK,

what causes the failure and which memory the host can access?

note: we use ccs3.3 and bios5.31.08