Version 3.2 sounds new enough. I vaguely remember I had problems with really old kernels, eg 2.6.28. The kernel config for the AM335X has CONFIG_TI_CPSW and CONFIG_TI_DAVINCI_MDIO enabled. The driver framework should pass down ioctl commands SIOCGMIIREG and SIOCSMIIREG down to the mdio code. What is the exact error when you try to use the ioctl?
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