raspberry-pi-5.nix set `boot.kernelParams = lib.mkDefault [ "console=tty0" ]`
to keep the serial console off the GPIO UART so a validator can own it. It
never took effect: kernelParams is list-merged, and only definitions at the
highest priority survive — nixpkgs defines loglevel/lsm at normal priority,
so the mkDefault list was discarded wholesale. Effective params on
rpi5-installed were `[ "loglevel=4" "lsm=landlock,yama,bpf" ]`, no console=
at all, which makes the kernel fall back to the device tree's stdout-path:
that same UART.
Drop the mkDefault so the entry merges. Verified by evaluating
config.boot.kernelParams before/after.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013A6683cCHnQxFUosx1krY4
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