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这是在线升级，那么自然会有个 FLASH 擦写的操作，大家都知道：如果是在擦出会页写入时，会有一个较长时间的延迟。请留意一下
还没有开始擦写FLASH，问题发生在于28377的SCI bootloader通信过程中，采用9600bps时能通信，采用19200bps时，出现通信中断
