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Problem of chip boot

Question asked by j hp on Dec 1, 2017
Latest reply on Dec 6, 2017 by j hp

I produced 90 pieces of boards in batch, of which 87 had problems and 3 were normal. The problematic CPU is :MCIMX6D5EYM10AD   Notice this:QAM1535   but 3 pieces of good CPU MARK :QAM1646.

87 pieces can be downloaded normally, but can't start。 There is no data in the serial port。The appendage is the normal boot and the abnormal boot information。3 pieces of good board are normal 。Is there a difference in the curing of the guide ROM?Can you tell me how to deal with it?The boot mode of the board is eMMC, and the peripheral CFG bits are all normal。