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使用RM57LS843,移植LWIP的问题

Other Parts Discussed in Thread: HALCOGEN

在RM48上移植成功了LWIP,换成RM57的CPU,在HAL GEN工具上修改了CPU的频率(100MHZ-75MHZ),调试发现总在读MDIO的USERACCESS0寄存器的地方,不成功,原因是在HL_mdio的文件里,写1到MDIO_USERACCESS0_GO后,总读出后16位寄存器为0,在RM48上可以读出寄存器的状态。请问,是否还需要配置什么地方?