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power up & boot issue

Hi TI

      I have designed  several boards,using C6A8168(PG 1.1).I set the board SPI boot first. But find there is one board can't boot stabley( sometimes uart has no output,sometimes ok). I've checked the power sequence ,and find it's ok. I also make the TCLKIN tied to GND. so can u give me some advices? thank u