dotfiles/nixos/systems/blowhole/sol.nix

{...}: {
  boot.kernelParams = [
    "console=ttyS1,115200"
    "console=tty1"
  ];

  boot.loader.grub.extraConfig = ''
    serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
    terminal_input console serial
    terminal_output console serial
  '';
}