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c6748 EDMA read spi flash

hello: 

I am now using c6748, and I read or write spi flash through edma, and I found that if I first erased flash, then write ,and last readback to verify  the data to be written,  It‘s

OK, But if I power off the dsp, then power on, and read the data back, found that the first 8 bytes is 0, not what I wrote before power off, and the left data is rigth,

I don't know why, can anyone help me? 

Thanks!