mirror of
https://github.com/nix-community/raspberry-pi-nix.git
synced 2025-11-08 19:46:03 +01:00
Travis Staton
GitHub
commit
b39b556e8a
2 changed files with 176 additions and 24 deletions
148
rpi/default.nix
148
rpi/default.nix
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@ -1,6 +1,8 @@
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{ core-overlay, libcamera-overlay }:
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{ lib, pkgs, config, ... }:
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let cfg = config.raspberry-pi-nix;
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in
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{
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imports = [ ../sd-image ./config.nix ./i2c.nix ];
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@ -10,26 +12,70 @@
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enable = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Whether to run the migration service automatically or not.
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'';
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};
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};
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libcamera-overlay = {
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enable = mkOption {
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default = true;
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type = types.bool;
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description = ''
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If enabled then the libcamera overlay is applied which
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overrides libcamera with the rpi fork.
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'';
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};
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};
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uboot = {
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enable = mkOption {
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default = true;
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type = types.bool;
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description = ''
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If enabled then uboot is used as the bootloader. If disabled
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then the linux kernel is installed directly into the
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firmware directory as expected by the raspberry pi boot
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process.
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This can be useful for newer hardware that doesn't yet have
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uboot compatibility or less common setups, like booting a
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cm4 with an nvme drive.
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'';
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};
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};
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};
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};
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config = {
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boot.kernelParams =
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if cfg.uboot.enable then [ ]
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else [
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# This is ugly and fragile, but the sdImage image has an msdos
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# table, so the partition table id is a 1-indexed hex
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# number. So, we drop the hex prefix and stick on a "02" to
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# refer to the root partition.
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"root=PARTUUID=${lib.strings.removePrefix "0x" config.sdImage.firmwarePartitionID}-02"
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"rootfstype=ext4"
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"fsck.repair=yes"
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"rootwait"
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"init=/sbin/init"
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];
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systemd.services = {
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"raspberry-pi-firmware-migrate" =
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lib.mkIf config.raspberry-pi-nix.firmware-migration-service.enable {
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{
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description = "update the firmware partition";
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wantedBy = [ "multi-user.target" ];
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wantedBy = if cfg.firmware-migration-service.enable then [ "multi-user.target" ] else [ ];
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serviceConfig =
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let firmware-path = "/boot/firmware";
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in {
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let
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firmware-path = "/boot/firmware";
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kernel-params = pkgs.writeTextFile {
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name = "cmdline.txt";
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text = ''
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${lib.strings.concatStringsSep " " config.boot.kernelParams}
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'';
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};
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in
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{
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Type = "oneshot";
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MountImages =
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"/dev/disk/by-label/${config.sdImage.firmwarePartitionName}:${firmware-path}";
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@ -41,6 +87,8 @@
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TARGET_OVERLAYS_DIR="$TARGET_FIRMWARE_DIR/overlays"
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TMPFILE="$TARGET_FIRMWARE_DIR/tmp"
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UBOOT="${pkgs.uboot_rpi_arm64}/u-boot.bin"
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KERNEL="${pkgs.rpi-kernels.latest.kernel}/Image"
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SHOULD_UBOOT=${if cfg.uboot.enable then "1" else "0"}
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SRC_FIRMWARE_DIR="${pkgs.raspberrypifw}/share/raspberrypi/boot"
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STARTFILES=("$SRC_FIRMWARE_DIR"/start*.elf)
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DTBS=("$SRC_FIRMWARE_DIR"/*.dtb)
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@ -61,6 +109,28 @@
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rm "$STATE_DIRECTORY/uboot-migration-in-progress"
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}
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migrate_kernel() {
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echo "migrating kernel"
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touch "$STATE_DIRECTORY/kernel-migration-in-progress"
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cp "$KERNEL" "$TMPFILE"
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mv -T "$TMPFILE" "$TARGET_FIRMWARE_DIR/kernel.img"
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echo "${
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builtins.toString pkgs.rpi-kernels.latest.kernel
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}" > "$STATE_DIRECTORY/kernel-version"
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rm "$STATE_DIRECTORY/kernel-migration-in-progress"
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}
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migrate_cmdline() {
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echo "migrating cmdline"
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touch "$STATE_DIRECTORY/cmdline-migration-in-progress"
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cp "${kernel-params}" "$TMPFILE"
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mv -T "$TMPFILE" "$TARGET_FIRMWARE_DIR/cmdline.txt"
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echo "${
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builtins.toString kernel-params
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}" > "$STATE_DIRECTORY/cmdline-version"
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rm "$STATE_DIRECTORY/cmdline-migration-in-progress"
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}
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migrate_config() {
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echo "migrating config.txt"
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touch "$STATE_DIRECTORY/config-migration-in-progress"
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@ -94,12 +164,24 @@
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rm "$STATE_DIRECTORY/firmware-migration-in-progress"
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}
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if [[ -f "$STATE_DIRECTORY/uboot-migration-in-progress" || ! -f "$STATE_DIRECTORY/uboot-version" || $(< "$STATE_DIRECTORY/uboot-version") != ${
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if [[ "$SHOULD_UBOOT" -eq 1 ]] && [[ -f "$STATE_DIRECTORY/uboot-migration-in-progress" || ! -f "$STATE_DIRECTORY/uboot-version" || $(< "$STATE_DIRECTORY/uboot-version") != ${
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builtins.toString pkgs.uboot_rpi_arm64
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} ]]; then
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migrate_uboot
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fi
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if [[ "$SHOULD_UBOOT" -ne 1 ]] && [[ ! -f "$STATE_DIRECTORY/kernel-version" || $(< "$STATE_DIRECTORY/kernel-version") != ${
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builtins.toString pkgs.rpi-kernels.latest.kernel
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} ]]; then
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migrate_kernel
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fi
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if [[ "$SHOULD_UBOOT" -ne 1 ]] && [[ ! -f "$STATE_DIRECTORY/cmdline-version" || $(< "$STATE_DIRECTORY/cmdline-version") != ${
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builtins.toString kernel-params
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} ]]; then
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migrate_cmdline
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fi
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if [[ -f "$STATE_DIRECTORY/config-migration-in-progress" || ! -f "$STATE_DIRECTORY/config-version" || $(< "$STATE_DIRECTORY/config-version") != ${
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builtins.toString config.hardware.raspberry-pi.config-output
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} ]]; then
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@ -141,7 +223,7 @@
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# linux kernel.
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kernel = {
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enable = true;
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value = "u-boot-rpi-arm64.bin";
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value = if cfg.uboot.enable then "u-boot-rpi-arm64.bin" else "kernel.img";
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};
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arm_64bit = {
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enable = true;
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@ -194,8 +276,9 @@
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loader = {
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grub.enable = lib.mkDefault false;
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initScript.enable = !cfg.uboot.enable;
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generic-extlinux-compatible = {
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enable = lib.mkDefault true;
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enable = lib.mkDefault cfg.uboot.enable;
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# We want to use the device tree provided by firmware, so don't
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# add FDTDIR to the extlinux conf file.
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useGenerationDeviceTree = false;
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@ -205,11 +288,52 @@
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hardware.enableRedistributableFirmware = true;
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services = {
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udev.extraRules = ''
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SUBSYSTEM=="dma_heap", GROUP="video", MODE="0660"
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KERNEL=="gpiomem", GROUP="gpio", MODE="0660"
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KERNEL=="gpiochip*", GROUP="gpio", MODE="0660"
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'';
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udev.extraRules =
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let shell = "${pkgs.bash}/bin/bash";
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in ''
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# https://raw.githubusercontent.com/RPi-Distro/raspberrypi-sys-mods/master/etc.armhf/udev/rules.d/99-com.rules
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SUBSYSTEM=="input", GROUP="input", MODE="0660"
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SUBSYSTEM=="i2c-dev", GROUP="i2c", MODE="0660"
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SUBSYSTEM=="spidev", GROUP="spi", MODE="0660"
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SUBSYSTEM=="*gpiomem*", GROUP="gpio", MODE="0660"
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SUBSYSTEM=="rpivid-*", GROUP="video", MODE="0660"
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KERNEL=="vcsm-cma", GROUP="video", MODE="0660"
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SUBSYSTEM=="dma_heap", GROUP="video", MODE="0660"
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SUBSYSTEM=="gpio", GROUP="gpio", MODE="0660"
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SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="${shell} -c 'chgrp -R gpio /sys/class/gpio && chmod -R g=u /sys/class/gpio'"
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SUBSYSTEM=="gpio", ACTION=="add", PROGRAM="${shell} -c 'chgrp -R gpio /sys%p && chmod -R g=u /sys%p'"
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# PWM export results in a "change" action on the pwmchip device (not "add" of a new device), so match actions other than "remove".
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SUBSYSTEM=="pwm", ACTION!="remove", PROGRAM="${shell} -c 'chgrp -R gpio /sys%p && chmod -R g=u /sys%p'"
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KERNEL=="ttyAMA[0-9]*|ttyS[0-9]*", PROGRAM="${shell} -c '\
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ALIASES=/proc/device-tree/aliases; \
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TTYNODE=$$(readlink /sys/class/tty/%k/device/of_node | sed 's/base/:/' | cut -d: -f2); \
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if [ -e $$ALIASES/bluetooth ] && [ $$TTYNODE/bluetooth = $$(strings $$ALIASES/bluetooth) ]; then \
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echo 1; \
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elif [ -e $$ALIASES/console ]; then \
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if [ $$TTYNODE = $$(strings $$ALIASES/console) ]; then \
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echo 0;\
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else \
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exit 1; \
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fi \
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elif [ $$TTYNODE = $$(strings $$ALIASES/serial0) ]; then \
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echo 0; \
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elif [ $$TTYNODE = $$(strings $$ALIASES/serial1) ]; then \
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echo 1; \
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else \
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exit 1; \
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fi \
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'", SYMLINK+="serial%c"
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ACTION=="add", SUBSYSTEM=="vtconsole", KERNEL=="vtcon1", RUN+="${shell} -c '\
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if echo RPi-Sense FB | cmp -s /sys/class/graphics/fb0/name; then \
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echo 0 > /sys$devpath/bind; \
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fi; \
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'"
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'';
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};
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};
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@ -5,23 +5,51 @@
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config = {
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boot.loader.grub.enable = false;
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boot.loader.generic-extlinux-compatible.enable = true;
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boot.consoleLogLevel = lib.mkDefault 7;
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# https://github.com/raspberrypi/firmware/issues/1539#issuecomment-784498108
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boot.kernelParams = [ "console=serial0,115200n8" "console=tty1" ];
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sdImage = {
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populateFirmwareCommands = ''
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cp ${pkgs.uboot_rpi_arm64}/u-boot.bin firmware/u-boot-rpi-arm64.bin
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cp -r ${pkgs.raspberrypifw}/share/raspberrypi/boot/{start*.elf,*.dtb,bootcode.bin,fixup*.dat,overlays} firmware
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cp ${config.hardware.raspberry-pi.config-output} firmware/config.txt
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'';
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populateRootCommands = ''
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mkdir -p ./files/boot
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${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./files/boot
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'';
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};
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sdImage =
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let
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kernel-params = pkgs.writeTextFile {
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name = "cmdline.txt";
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text = ''
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${lib.strings.concatStringsSep " " config.boot.kernelParams}
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'';
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};
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populate-kernel =
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if config.raspberry-pi-nix.uboot.enable
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then ''
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cp ${pkgs.uboot_rpi_arm64}/u-boot.bin firmware/u-boot-rpi-arm64.bin
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''
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else ''
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cp "${pkgs.rpi-kernels.latest.kernel}/Image" firmware/kernel.img
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cp "${kernel-params}" firmware/cmdline.txt
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'';
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in
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{
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populateFirmwareCommands = ''
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${populate-kernel}
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cp -r ${pkgs.raspberrypifw}/share/raspberrypi/boot/{start*.elf,*.dtb,bootcode.bin,fixup*.dat,overlays} firmware
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cp ${config.hardware.raspberry-pi.config-output} firmware/config.txt
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'';
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populateRootCommands =
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if config.raspberry-pi-nix.uboot.enable
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then ''
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mkdir -p ./files/boot
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${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./files/boot
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''
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else ''
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mkdir -p ./files/sbin
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content="$(
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echo "#!${pkgs.bash}/bin/bash"
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echo "exec ${config.system.build.toplevel}/init"
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)"
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echo "$content" > ./files/sbin/init
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chmod 744 ./files/sbin/init
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'';
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};
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};
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}
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