On Fri, Dec 15, 2023 at 10:40:45PM +0200, Cristian Ciocaltea wrote: > The StarFive VisionFive V1 SBC uses a Motorcomm YT8521 PHY supporting > RGMII-ID, but requires manual adjustment of the RX internal delay to > work properly. > > The default RX delay provided by the driver is 1.95 ns, which proves to > be too high. Applying a 50% reduction seems to mitigate the issue. > > Also note this adjustment is not necessary on BeagleV Starlight SBC, > which uses a Microchip PHY. Hence, there is no indication of a > miss-behaviour on the GMAC side, but most likely the issue stems from > the Motorcomm PHY. I suggest you make a similar comment in the .dts file, just to explain the odd setting. Andrew
