Hi haifeng jin,
非常感谢使用NXP产品，很高兴为你提供技术支持！
不需要的代码专门控制的，建议客户通过此文（https://mp.weixin.qq.com/s/0Ym_s5Wib4udxieIS75vsw）先解一下i.MX RT的上电时序和电源设计。
Have a great day,
TIC
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