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why i can't receive doorbell interrupt



Hello,I am testing Siro using evm6678 and kintex7,I test the Siri using a test program from stk, which is downloaded from ti forum. Between the two board, I have tested that the evm6678 received  nwrite instruction, and the data wrote to the destination on evm6678 is right, but  I can't receive doorbell interrupt after I change to send doorbell instruction from flag, does it any very different  between these two instruction, I'm waiting for your answer