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TPS54318: Cannot output power

Part Number: TPS54318


Please see my schematic. Don't know why there is no output voltage. Last build, I use almost the same schematic except C6101.

Below is what I've tried

1. remove R6045 to ensure there is no output short from other circuits.

2. external pull 3.3V at enable pin.

3. measured input voltage is around 4.2V

4.I measured pin8 RT/CLK, and its voltage is around 1.8V. not 0.5V which specified on spec

What else could I check? please help on comment. thanks