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# To build, use:
# nix-build nixos -I nixos-config=nixos/modules/installer/sd-card/sd-image-armv7l-multiplatform.nix -A config.system.build.sdImage
{ config, lib, pkgs, ... }:
{
imports = [
../../profiles/base.nix
./sd-image.nix
];
boot.loader.grub.enable = false;
boot.loader.generic-extlinux-compatible.enable = true;
boot.consoleLogLevel = lib.mkDefault 7;
boot.kernelPackages = pkgs.linuxPackages_latest;
# The serial ports listed here are:
# - ttyS0: for Tegra (Jetson TK1)
# - ttymxc0: for i.MX6 (Wandboard)
# - ttyAMA0: for Allwinner (pcDuino3 Nano) and QEMU's -machine virt
# - ttyO0: for OMAP (BeagleBone Black)
# - ttySAC2: for Exynos (ODROID-XU3)
boot.kernelParams = ["console=ttyS0,115200n8" "console=ttymxc0,115200n8" "console=ttyAMA0,115200n8" "console=ttyO0,115200n8" "console=ttySAC2,115200n8" "console=tty0"];
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
[pi2]
kernel=u-boot-rpi2.bin
[pi3]
kernel=u-boot-rpi3.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
'';
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 ${pkgs.ubootRaspberryPi3_32bit}/u-boot.bin firmware/u-boot-rpi3.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
'';
};
}
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