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DRA821U: How to enable fixed-link?

Part Number: DRA821U

I want to use "MAC to MAC" mode with CPSW5G, 3 RGMII port connect to ECU(MAC to MAC), and 1 RGMII port connect to PHY,   how I can enable this feature?  Please tell me the way to config the feature, such as pin config, code changes, or show me some examples.