rpi4: Introduce raspberry-pi."4".enable #1515
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Description of changes
Don't enable anything unless explicitly enabled. Otherwise e.g. the specified kernel complicates running a x86_64 vm of a rpi4 NixOS system.
In general, NixOS modules shouldn't ever just define things and always guard them e.g. by
enable
options.This PR guards the unconditional configs from
default.nix
andcpu-revision.nix
with a new flaghardware.raspberry-pi."4".enable
.Things done
nixos-hardware
andimporting it via
<nixos-hardware>
or Flake input