eth0 does not work out of the box on Raspberry Pi 400 - device has no carrier · Issue #2338 · home-assistant/operating-system · GitHub
CM4 after reboot NIC (eth0) disappears / no ethernet connection · Issue #5497 · raspberrypi/linux · GitHub
Raspberry Pi 4: Network non-functional directly after (re)boot · Issue #3034 · raspberrypi/linux · GitHub
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