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tm4c1294 enet_lwip 例程 读出的mac地址都为0xfffffff

我用的是tm4c1294 enet_lwip 例程 读mac地址几块芯片都是0xffffffff) 用 MAP_FlashUserSet(ui32User0, ui32User1);写user register不掉电可以,一掉电又都是0xffffffff 请问有什么方法能使user register掉电保存或能读到芯片有效的mac,自己写的话怕会有冲突