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It seems that the Ethernet initialization in U-Boot causes significant packet drops in Linux on some board. On a ODROID-M1 with 8GB of RAM, a packet loss rate of ~20% has been observed. From the user point of view it feels like a massive slow down (SSH feels very slow, Home Assistant loads very slow or not at all). Disabling the Ethernet controller driver avoids initialization in U-Boot and makes Ethernet work correctly again in Linux. While at it, drop the previously board specific configs. They haven't been used and the board seemed fine without them.