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flash bootloader在线升级

Flash boot loader的运营机制,是每次从flash 中搬运一部分程序放入内部ram,运行完再搬入一部分。

还是一次性全部搬入?

如果是一部分搬入,对于在线升级下载程序,比如串口升级flash内部程序。

是否会存在覆盖之前原程序的问题。