PROCESSOR-SDK-DRA7X: How can I config the settings when TDA2x RMII MAC connect directly to another RMII MAC device without external phy?

Hi

You can use the fixed link property in the DTB file for PHY-less mode of operation.

This is supported in the kernel but not in uboot

You will need to add snippet similar to (you will find this defined under arch/arm/boot/dts/dra7-evm.dts for instance)

 &cpsw_emac0 {

-              phy-mode = "rgmii-id";

+             phy-mode = "rmii";

-              phy-id = <&davinci_mdio>, <2>

+    fixed-link {

+        speed = <100>;

+        full-duplex;

+    };

};

Fixed link properties are described under Documentation/devicetree/bindings/net/fixed-link.txt"