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External clock on RGMII_TX_CTL possible for RMII?

Question asked by Magnus Nilsson on Dec 10, 2014
Latest reply on Dec 10, 2014 by igorpadykov

I have a custom IMXDL board with a KSZ8863 switch.

According to MDIO the switch is fine, but RMII is dead silent.

Both IMXDL and PHY are clocked by external clock.


I would like to confirm that it is indeed possible to use RGMII_TX_CTL to clock RMII from an external clock?

The HW dev. guide (IMX6DQ6SDLHDG) is a bit light on detail regarding RGMII_TX_CTL, as GPIO_16 is the recommended external clock sink.


If RGMII_TX_CTL is a valid clock sink for RMII, it's a SW issue and I'd much appreciate any sample code.

I'm trying to get ethernet running on uboot, for a start.