NXP QorIQ SDK u-Boot does have provisions for communication with MDIO-
attached PHYs. If it is a custom board, make sure your board-specific
code properly registers the MDIO controller your PHY connects to by
calling fm_memac_mdio_init() and sets your PHYs management addresses
by fm_info_set_phy_address(). If your board code does everything properly,
you should be able to communicate to your PHY using 'mii' CLI command.
See board_eth_init() function defined in board/freescale/t4rdb/eth.c
procedure for a reference.
Note, the above functions and files may not be implemented, or may look differently
if you are working with a non-SDK version of u-Boot.
Have a great day,
Platon
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