imx6q how to change enet rgmii tx clock's phase

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imx6q how to change enet rgmii tx clock's phase

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muryliang
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I use  imx6q custom board's mac to connect a fpga board, which is used as the phy side, and use rgmii mode. I have configured fixed-link and set speed as 1000,  now   send and recv can work fine.  But when I keep sending packet from imx6q to fpga board, sometimes package will lose.    I think it may because the tx clock and txdata are too close, so I want to change tx clock phase by 90 degree,  how can I do that, where in the code modify? 

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