How to configure the speed of DTSEC 3 using UBOOT on T2080 RDb board
u-Boot always trusts PHY autonegotiation. There is no tool like linux ethool. You have to alter the driver and rebuild to achieve that.
One possible way I see is to set phydev->advertising to the desired values before calling phy_config() in init_phy() in drives/net/fm/eth.c
Have a great day,
Platon
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