On Wed, Jul 28, 2021 at 06:10:20PM +0200, Michael Riesch wrote: > +&gmac0 { > + phy-mode = "rgmii"; ... > + > + tx_delay = <0x3c>; > + rx_delay = <0x2f>; Hi Michael In general, we try to have the PHY introduce the RGMII delays, not the MAC. Did you try phy-mode = "rgmii-id"; and remove these delay values? It is hard for me to say if that will work because i've no idea what 0x3c and 0x2f means? Are they equivalent to 2ns? Andrew