configuration-sd.nix

{ config, lib, pkgs, ... }:

{
  system.disableInstallerTools = lib.mkForce true;

  # Include support for various filesystems.
  #boot.supportedFilesystems = [ "vfat" ];

  boot.loader.grub.enable = false;
  boot.loader.generic-extlinux-compatible.enable = true;

  boot.consoleLogLevel = lib.mkDefault 7;
  boot.kernelPackages = pkgs.linuxPackages_rpi1;
  boot.kernelParams = [ "coherent_pool=4M" "dtoverlay=dwc2" "console=ttyAMA0,115200" "console=tty1" ];
  #boot.kernelPackages = pkgs.linuxKernel.packages.linux_rpi1;

  sdImage = {
    populateFirmwareCommands = let
      configTxt = pkgs.writeText "config.txt" ''
        # Prevent the firmware from smashing the framebuffer setup done by the mainline kernel
        # when attempting to show low-voltage or overtemperature warnings.
        avoid_warnings=1

        [pi0]
        kernel=u-boot-rpi0.bin

        [pi1]
        kernel=u-boot-rpi1.bin
      '';
      in ''
        (cd ${pkgs.raspberrypifw}/share/raspberrypi/boot && cp bootcode.bin fixup*.dat start*.elf $NIX_BUILD_TOP/firmware/)
        cp ${pkgs.ubootRaspberryPiZero}/u-boot.bin firmware/u-boot-rpi0.bin
        cp ${pkgs.ubootRaspberryPi}/u-boot.bin firmware/u-boot-rpi1.bin
        cp ${configTxt} firmware/config.txt
      '';
    populateRootCommands = ''
      mkdir -p ./files/boot
      ${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./files/boot
    '';
  };
}