Hi Chen zhaoming,
In order to get more suport, could you bring us more details about what are you doing?, if you are working with linux or windows?, what board are you try to put micropython?.
so, maybe this tech article can help.
https://www.nxp.com/docs/en/application-note/AN13242.pdf
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I hope this will help you
Have a good day
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Carlos Enrique
Technical Support
NXP Semiconductor
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