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In 4.14 the delays were not cleared, so setting "rgmii" as phy-mode did not affect delays set by the bootloader. With 5.4 kernel the situation changed and the ethernet interface stopped working. "rgmii" requires rx and tx delays depending on the hardware circuit and wiring. The mac or the phy can add these delays. - "rgmii": delays are controlled by the mac - "rgmii-id": delays are controlled by the phy More Information in Linux Kernel Tree: Documentation/devicetree/bindings/net/ethernet-controller.yaml "rgmii" should be the preferred mode, which allows the mac layer to turn off the dealys completely if they are not needed. However, the delays are not set correctly, which causes the ethernet interface to be broken. Just taking the ethernetpart from the litebeam ac gen2 will fix the issue. Explained-by: David Bauer <mail@david-bauer.net> Signed-off-by: Nick Hainke <vincent@systemli.org> |
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