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# 调试接口分诊
1. 找丝印：TX RX GND VCC TDI TDO TCK TMS
2. 电压匹配再连接
3. 先只读串口日志
4. 记录 U-Boot 中断键与环境变量（不随意 saveenv）
5. 镜像提取后 SHA256
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