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AM3352+DP83848 u-boot读取BMCR为0xFFFF



硬件平台:参照BeagleBone Black的硬件原理图,更换3358为3352,更换以太网PHY为DP83848,工作在MII模式,使用25MHz的外部晶振,之前的LAN8710可正常工作。

软件平台:TI SDK6.0。

调试问题:在u-boot中读取PHY的BMCR寄存器值为0xFFFF,量了电源与晶振都是正常的,请问可能是哪些问题?