mio-ops/images/sd-image_paidh-armv7.nix

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# Base image for building SD images for my Pi 2's
#
# To build, use:
# imports = [ ./sd-image_paidh-armv7.nix ]
{ config, lib, pkgs, ... }:
let
extlinux-conf-builder =
import <nixpkgs/nixos/modules/system/boot/loader/generic-extlinux-compatible/extlinux-conf-builder.nix> {
pkgs = pkgs.buildPackages;
};
in
{
imports = [
<nixpkgs/nixos/modules/profiles/base.nix>
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<nixpkgs/nixos/modules/installer/cd-dvd/sd-image.nix>
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];
boot.consoleLogLevel = lib.mkDefault 7;
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
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[pi2]
kernel=u-boot-rpi2.bin
# U-Boot used to need this to work, regardless of whether UART is actually used or not.
# TODO: check when/if this can be removed.
enable_uart=1
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'';
in ''
(cd ${pkgs.raspberrypifw}/share/raspberrypi/boot && cp bootcode.bin fixup*.dat start*.elf $NIX_BUILD_TOP/firmware/)
cp ${pkgs.ubootRaspberryPi2}/u-boot.bin firmware/u-boot-rpi2.bin
cp ${configTxt} firmware/config.txt
'';
populateRootCommands = ''
mkdir -p ./files/boot
${extlinux-conf-builder} -t 3 -c ${config.system.build.toplevel} -d ./files/boot
'';
};
}