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启动时间优化

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Created by SteveChen on Oct 03, 2019

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为了测量整体时间的消耗，可以使用grapserial工具来，测量开发板串口的消息时间戳。

grabserial -d "/dev/ttyUSB0" -e 30 -t -m "U-Boot SPL*"

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