On Wed, Aug 23, 2023 at 11:46 AM Andrew Lunn <andrew@xxxxxxx> wrote: > > > I understand the delay issue of RGMII. > > Just tried phy-mode = "rgmii-id", it still works. > > That indicates something is broken. Both "rgmii-id" and "rgmii" should > not work, just one of them. What PHY driver are you using? > I used generic PHY driver. Both "rgmii" and "rgmii-id" work with this driver. The PHY is RTL8211E. So I switch the PHY driver to Realtek driver. Now only "rgmii-id" works. Thanks! > Andrew > -- Best regards, Keguang Zhang