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tm4c129使用自带bootload和LM flash programmer网络下程序的问题

用jLink分别烧录自带的BootLoader (boot_emac_flash)和app (boot_demo_emac_flash),在LM flash programmer工具里通过网络更新bin文件,为何连接不上?提示Attemptting to connect...,就没有反应了。在app中接收udp数据的地方设断点,根本收不到魔术包。我自己写的一个工具往端口9发广播,反而能进断点,这是什么原因?难道哪里还需要配置吗?