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RGMII connect RGMII can't work,output wrong clock

Our platform is TI J6,we use rgmii0 direct connect the RGMII on switch bcm89501.

I modify the cpsw driver to fixed phy mode,and the register "SL_MACCONTROL"  be set to value 0xA1 ---/full duplex,1000M speed.

But the TX clock on J6'RGMII still output 2.5M.

If anyone can help me ??

Thanks !!