nixpkgs-suyu/nixos/modules/installer/cd-dvd/sd-image-armv7l-multiplatform.nix

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# To build, use:
# nix-build nixos -I nixos-config=nixos/modules/installer/cd-dvd/sd-image-armv7l-multiplatform.nix -A config.system.build.sdImage
{ config, lib, pkgs, ... }:
let
extlinux-conf-builder =
import ../../system/boot/loader/generic-extlinux-compatible/extlinux-conf-builder.nix {
inherit pkgs;
};
in
{
imports = [
../../profiles/minimal.nix
../../profiles/installation-device.nix
./sd-image.nix
];
assertions = lib.singleton {
assertion = pkgs.stdenv.system == "armv7l-linux";
message = "sd-image-armv7l-multiplatform.nix can be only built natively on ARMv7; " +
"it cannot be cross compiled";
};
# Needed by RPi firmware
nixpkgs.config.allowUnfree = true;
boot.loader.grub.enable = false;
boot.loader.generic-extlinux-compatible.enable = true;
boot.kernelPackages = pkgs.linuxPackages_latest;
boot.kernelParams = ["console=ttyS0,115200n8" "console=ttymxc0,115200n8" "console=ttyAMA0,115200n8" "console=ttyO0,115200n8" "console=tty0"];
# FIXME: this probably should be in installation-device.nix
users.extraUsers.root.initialHashedPassword = "";
sdImage = {
populateBootCommands = let
configTxt = pkgs.writeText "config.txt" ''
[pi2]
kernel=u-boot-rpi2.bin
[pi3]
kernel=u-boot-rpi3.bin
enable_uart=1
'';
in ''
(cd ${pkgs.raspberrypifw}/share/raspberrypi/boot && cp bootcode.bin fixup*.dat start*.elf $NIX_BUILD_TOP/boot/)
cp ${pkgs.ubootRaspberryPi2}/u-boot.bin boot/u-boot-rpi2.bin
cp ${pkgs.ubootRaspberryPi3_32bit}/u-boot.bin boot/u-boot-rpi3.bin
cp ${configTxt} boot/config.txt
${extlinux-conf-builder} -t 3 -c ${config.system.build.toplevel} -d ./boot
'';
};
}