modules/hal/samsung: init
this can be used to get baseline support for samsung exynos5 chromebook i should probably rename it, in time
This commit is contained in:
parent
50450fe7fe
commit
52a0e8cf53
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@ -2,6 +2,7 @@
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{
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imports = [
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./pine64.nix
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./samsung
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./x86_64.nix
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];
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}
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339
hosts/modules/hal/samsung/default.nix
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339
hosts/modules/hal/samsung/default.nix
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# device support for samsung XE303C12 "google-snow" model, specifically.
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# see: <https://wiki.postmarketos.org/wiki/Samsung_Chromebook_(google-snow)>
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# - build logs: <https://images.postmarketos.org/bpo/edge/google-snow/console/>
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# see: <https://github.com/thefloweringash/kevin-nix>
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# - related "depthcharge" chromebook, built with nix
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# see: <https://mobile.nixos.org/devices/lenovo-wormdingler.html>
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# - above module, integrated into an image builder
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# - implementation in modules/system-types/depthcharge
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# see: <https://web.archive.org/web/20191103000916/http://www.chromium.org/chromium-os/firmware-porting-guide/using-nv-u-boot-on-the-samsung-arm-chromebook>
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# - referenced from u-boot `doc/` directory
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# - <https://web.archive.org/web/20220813062811/https://www.chromium.org/chromium-os/how-tos-and-troubleshooting/using-an-upstream-kernel-on-snow/>
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# - <https://web.archive.org/web/20240119111314/https://www.chromium.org/chromium-os/developer-information-for-chrome-os-devices/custom-firmware/>
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# - google exynos5_defconfig: <https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/%2B/HEAD/eclass/cros-kernel>
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# see: <repo:postmarketOS/pmaports:device/community/device-google-snow>
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# - <https://gitlab.com/postmarketOS/boot-deploy/-/blob/5f08ebb05a520d0e6bccfcda324f12e4aac1623f/boot-deploy-functions.sh#L872>
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# - deviceinfo:
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# - deviceinfo_flash_method="none"
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# - deviceinfo_cgpt_kpart="/boot/vmlinuz.kpart"
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# - deviceinfo_cgpt_kpart_start="8192"
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# - deviceinfo_cgpt_kpart_size="16384"
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# - deviceinfo_kernel_cmdline="console=null"
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# - deviceinfo_depthcharge_board="snow"
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# - deviceinfo_generate_depthcharge_image="true"
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# - deviceinfo_generate_extlinux_config="true"
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# - modules-initfs:
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# - drm-dp-aux-bus
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# - panel-edp
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# - drm-kms-helper
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# - cros-ec-keyb
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# - sbs-battery
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# - tps65090-charger
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# - uas
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# - sd-mod
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# - pmOS also uses a custom alsa UCM config
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# - pmOS kernel package: linux-postmarketos-exynos5
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# - pmOS firmware packages (for WiFi/Bluetooth): linux-firmware-mrvl linux-firmware-s5p-mfc
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#
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# pmOS image has disk layout:
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# /dev/sdb1 8192 24575 16384 8M ChromeOS kernel
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# /dev/sdb2 24576 548863 524288 256M EFI System
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# /dev/sdb3 548864 31336414 30787551 14.7G Microsoft basic data
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# - built using `depthcharge-tools`: <https://github.com/alpernebbi/depthcharge-tools>
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# - expected chromeos disk layout documented: <https://www.chromium.org/chromium-os/developer-library/reference/device/disk-format/>
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#
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# typical boot process:
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# - BIOS searches for a partition `ChromeOS Kernel Type GUID (fe3a2a5d-4f32-41a7-b725-accc3285a309)`
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# - first 64K are reserved for sigantures (when verified boot is active)
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# - then kernel, some datastructures (i.e. config.txt, the command line passed to the kernel), bootloader stub
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# - BIOS loads kernel blob into RAM, then invokes the bootstub
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# - bootloader stub is an EFI application. it setups up tables and jumps into the kernel.
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# - so potentially i could put any EFI application here, and load the kernel myself from somewhere else?
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# - partitions are all 2MiB-aligned
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# according to depthcharge-tools, max image size is 8 MiB, though i don't know how strict that is.
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{ config, lib, pkgs, ... }:
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let
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cfg = config.sane.hal.samsung;
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# dtbs = "${config.system.build.kernel}/dtbs/exynos";
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# dtbs = "${config.system.build.kernel}/dtbs";
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# initrd = "${config.system.build.initialRamdisk}";
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# kernel_file = "${config.system.build.kernel}/zImage"; #< TODO: `zImage` is specific to the `stdenv` config
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# kernel-lzma = pkgs.runCommand "kernel-lzma" { nativeBuildInputs = [ pkgs.xz ]; } ''
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# lzma --threads 0 < ${kernel_file} > "$out"
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# '';
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# cmdlineText = lib.concatStringsSep " " (config.boot.kernelParams ++ [
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# "init=${config.system.build.toplevel}/init"
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# ]);
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# cmdlineFile = pkgs.writeTextFile {
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# name = "kernel-cmdline";
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# text = cmdlineText;
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# };
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u-boot = pkgs.buildUBoot {
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defconfig = "snow_defconfig";
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extraMeta.platforms = [ "armv7l-linux" ];
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filesToInstall = [
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"u-boot" #< ELF file
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"u-boot.bin" #< raw binary, load it into RAM and jump toit
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"u-boot.cfg" #< copy of Kconfig which this u-boot was compiled with
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"u-boot.dtb"
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"u-boot.map"
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"u-boot-nodtb.bin"
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"u-boot.sym"
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];
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};
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in
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{
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options = {
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sane.hal.samsung.enable = lib.mkEnableOption "samsung-specific hardware support";
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};
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config = lib.mkIf cfg.enable {
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# we're limited to 8 MiB: omit the debugging utilities
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# boot.initrd.availableKernelModules = lib.mkForce [];
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boot.initrd.compressor = "gzip";
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# boot.initrd.compressorArgs = [ "--ultra" "-22" ];
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# boot.initrd.extraUtilsCommands = lib.mkForce ''
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# rm -f $out/bin/{ata_id,cdrom_id,dmsetup,fido_id,lvm,scsi_id,v4l_id}
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# '';
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# boot.initrd.supportedFilesystems = lib.mkForce [ "btrfs" ]; #< vfat should technically be optional?
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# boot.initrd.availableKernelModules = lib.mkForce [ ];
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# boot.initrd.extraUdevRulesCommands = lib.mkForce "";
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# boot.initrd.extraUtilsCommandsTest = lib.mkForce "";
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# boot.initrd.luks.cryptoModules = lib.mkForce [];
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# boot.initrd.services.udev.packages = lib.mkForce [];
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# boot.initrd.services.udev.rules = lib.mkForce "";
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# # boot.initrd.systemd.enable = true;
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# boot.initrd.systemd.enableTpm2 = false;
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# # # build systemd w/o efivarfs support, so it won't complain about that missing module
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# boot.initrd.systemd.package = pkgs.systemd.override { withEfi = false; };
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# boot.initrd.systemd.extraBin = lib.mkForce {};
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# boot.initrd.systemd.suppressedUnits = [
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# "ctrl-alt-del.target"
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# "debug-shell.service"
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# "emergency.service"
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# "emergency.target"
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# "rpcbind.target"
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# # "swap.target"
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# "systemd-fsck@.service"
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# "systemd-bsod.service"
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# ];
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boot.initrd.availableKernelModules = [
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# boot.initrd.kernelModules = [
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# from postmarketOS
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"drm-dp-aux-bus"
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"panel-edp"
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"drm-kms-helper"
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"cros-ec-keyb"
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"sbs-battery"
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"tps65090-charger"
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"uas"
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"sd-mod"
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];
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# TODO: mobile-nixos says these modules break udev, if builtin or run before udev:
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# "sbs-battery"
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# "sbs-charger"
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# "sbs-manager"
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boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-postmarketos-exynos5;
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# boot.kernelPackages = pkgs.linuxPackagesFor (pkgs.linux_latest.override {
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# structuredExtraConfig = with lib.kernel; {
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# CC_OPTIMIZE_FOR_SIZE = lib.mkForce yes;
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# };
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# });
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# nixpkgs.overlays = [(self: super: {
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# # optimize for size, especially to get a initrd which fits within the platform size constraints
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# stdenv = super.withCFlags [ "-Os" ] super.stdenv;
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# libgcrypt = super.libgcrypt.overrideAttrs (base: {
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# postPatch = (base.postPatch or "") + ''
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# export NIX_CFLAGS_COMPILE=
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# '';
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# });
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# })];
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system.build.u-boot = u-boot;
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# system.build.kernel-its = pkgs.runCommand "kernel-its-samsung" {
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# nativeBuildInputs = with pkgs; [
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# dtc
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# ubootTools
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# vboot_reference
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# xz
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# ];
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# meta.description = ''
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# ITS file is Image Tree Source: <https://gibbard.me/linux_fit_images/>
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# DTS is to ITS
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# as DTB is to FIT.
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# '';
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# } ''
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# ln -s "${kernel-lzma}" kernel.lzma
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# ln -s "${dtbs}" dtbs
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# ln -s "${initrd}/initrd" initrd
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# bash "${./make-kernel-its}" "$PWD" > $out
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# '';
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# system.build.kernel-lzma = kernel-lzma;
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# system.build.kernel-uimg = pkgs.runCommand "kernel-uimg" {
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# nativeBuildInputs = with pkgs; [
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# dtc
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# ubootTools
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# ];
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# } ''
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# ln -s "${config.system.build.kernel-lzma}" kernel.lzma
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# ln -s "${dtbs}" dtbs
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# ln -s "${initrd}/initrd" initrd
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# ln -s "${config.system.build.kernel-its}" kernel.its
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# mkimage \
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# -D "-I dts -O dtb -p 2048" \
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# -f kernel.its \
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# $out
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# '';
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system.build.platformPartition = pkgs.runCommandLocal "kernel-partition" {
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nativeBuildInputs = with pkgs; [
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vboot_reference
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dtc
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ubootTools
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];
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} ''
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# according to depthcharge-tools, bootloader.bin is legacy, was used by the earliest
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# chromebooks (H2C) *only*.
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dd if=/dev/zero of=dummy_bootloader.bin bs=512 count=1
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echo auto > dummy_config.txt
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# from uboot snow_defconfig, also == CONFIG_SYS_LOAD_ADDR
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CONFIG_TEXT_BASE=0x43e00000
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cp ${config.system.build.u-boot}/u-boot.bin .
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ubootFlags=(
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-A arm # architecture
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-O linux # operating system
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-T kernel # image type
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-C none # compression
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-a $CONFIG_TEXT_BASE # load address (CONFIG_TEXT_BASE)
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-e $CONFIG_TEXT_BASE # entry point (CONFIG_SYS_LOAD_ADDR), i.e. where u-boot `bootm` should jump to to execute the kernel
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-n nixos-uboot # image name
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-d u-boot.bin # image data
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u-boot.fit # output
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)
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mkimage "''${ubootFlags[@]}"
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futility \
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--debug \
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vbutil_kernel \
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--version 1 \
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--bootloader ./dummy_bootloader.bin \
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--vmlinuz u-boot.fit \
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--arch arm \
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--keyblock ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel.keyblock \
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--signprivate ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel_data_key.vbprivk \
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--config ./dummy_config.txt \
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--pack $out
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'';
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# system.build.platformPartition = pkgs.runCommandLocal "kernel-partition" {
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# nativeBuildInputs = with pkgs; [
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# dtc # for fdtget
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# python3Packages.depthcharge-tools
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# ubootTools # for mkimage
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# vboot_reference # for futility
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# ];
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# } ''
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# cp -R "${dtbs}" dtbs
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# cp ${u-boot}/u-boot .
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# depthchargectl build \
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# --verbose \
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# --vboot-keyblock ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel.keyblock \
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# --vboot-private-key ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel_data_key.vbprivk \
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# --root none \
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# --ignore-initramfs \
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# --board "snow" \
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# --kernel ./u-boot \
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# --fdtdir ./dtbs \
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# --output "$out"
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# '';
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# system.build.platformPartition = pkgs.runCommandLocal "kernel-partition" {
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# nativeBuildInputs = with pkgs; [
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# dtc # for fdtget
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# python3Packages.depthcharge-tools
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# ubootTools # for mkimage
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# vboot_reference # for futility
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# ];
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# # TODO: try --compress lz4 --compress lzma
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# } ''
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# # override default board settings (pray that the 8 MiB kpart limit isn't firmware enforced)
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# echo '[boards/arm/exynos5/daisy/snow]' > boardcfg
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# echo 'image-max-size = 16 MiB' >> boardcfg
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# cp "${kernel_file}" zImage
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# cp "${initrd}/initrd" initrd
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# cp -R "${dtbs}" dtbs
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# # --config ./boardcfg
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# # --no-kern-guid
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# depthchargectl build \
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# --verbose \
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# --vboot-keyblock ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel.keyblock \
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# --vboot-private-key ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel_data_key.vbprivk \
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# --root none \
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# --ignore-initramfs \
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# --board "snow" \
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# --kernel ./zImage \
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# --kernel-cmdline ${lib.escapeShellArg cmdlineText} \
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# --initramfs ./initrd \
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# --fdtdir ./dtbs \
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# --output "$out"
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# '';
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# ArchLinuxArm method:
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# system.build.platformPartition = pkgs.runCommandLocal "kernel-partition" {
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# nativeBuildInputs = with pkgs; [
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# vboot_reference
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# ];
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# } ''
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# # according to depthcharge-tools, bootloader.bin is legacy, was used by the earliest
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# # chromebooks (H2C) *only*.
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# dd if=/dev/zero of=bootloader.bin bs=512 count=1
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# futility \
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# --debug \
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# vbutil_kernel \
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# --version 1 \
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# --bootloader bootloader.bin \
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# --vmlinuz ${config.system.build.kernel-uimg} \
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# --arch arm7l \
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# --keyblock ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel.keyblock \
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# --signprivate ${pkgs.buildPackages.vboot_reference}/share/vboot/devkeys/kernel_data_key.vbprivk \
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# --config ${cmdlineFile} \
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# --pack $out
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# '';
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# nixos kernels + initrd can be hilariously large, so allocate a ton of space
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sane.image.platformPartSize = 256 * 1024 * 1024;
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# depthcharge firmware is designed for an A/B partition style,
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# where partition A holds a kernel and partion B holds a different kernel.
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# an update is to flash the currently inactive partition and then mark that one as active,
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# either switching the default boot from partition A to partition B, or from B to A.
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# anyway, this relies on the partitions having some extra metadata, which we add here.
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# i believe this metadata is stored in a depthcharge-specific format, not anything
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# which can be generalized.
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sane.image.installBootloader = ''
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${lib.getExe' pkgs.buildPackages.vboot_reference "cgpt"} add ${lib.concatStringsSep " " [
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"-i 1" # work on the first partition (instead of adding)
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"-S 1" # mark as successful (so it'll be booted from)
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"-T 5" # tries remaining
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"-P 10" # priority
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"$out"
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]}
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'';
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};
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}
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|
85
hosts/modules/hal/samsung/make-kernel-its
Executable file
85
hosts/modules/hal/samsung/make-kernel-its
Executable file
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#!/bin/sh
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# source: <https://github.com/thefloweringash/kevin-nix/blob/master/modules/make-kernel-its.sh>
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toplevel=$1
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cd $toplevel
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dtb_files=($(find -L dtbs -type f -name '*.dtb'))
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fdt_definition() {
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local idx=$1
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local filename=$2
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local basename=$(basename $filename)
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cat <<EOF
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fdt-${idx}{
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description = "${basename}";
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data = /incbin/("${filename}");
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type = "flat_dt";
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arch = "arm64";
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compression = "none";
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hash-1{
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algo = "sha1";
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};
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};
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EOF
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||||
}
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||||
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fdt_reference() {
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local idx=$1
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cat <<EOF
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conf-${idx}{
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kernel = "kernel-1";
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fdt = "fdt-${idx}";
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ramdisk = "ramdisk-1";
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};
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||||
EOF
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||||
}
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||||
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||||
cat <<EOF
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||||
/dts-v1/;
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||||
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||||
/ {
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||||
description = "Chrome OS kernel image with one or more FDT blobs";
|
||||
images {
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||||
kernel-1{
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||||
description = "kernel";
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||||
data = /incbin/("kernel.lzma");
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type = "kernel_noload";
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arch = "arm64";
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os = "linux";
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||||
compression = "lzma";
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load = <0>;
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entry = <0>;
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||||
};
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||||
ramdisk-1 {
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||||
description = "ramdisk";
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||||
data = /incbin/("initrd");
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type = "ramdisk";
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||||
arch = "arm64";
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||||
os = "linux";
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||||
compression = "none";
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||||
hash-1 {
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||||
algo = "sha1";
|
||||
};
|
||||
};
|
||||
EOF
|
||||
|
||||
for index in "${!dtb_files[@]}"; do
|
||||
fdt_definition $index ${dtb_files[$index]}
|
||||
done
|
||||
|
||||
cat <<EOF
|
||||
};
|
||||
configurations {
|
||||
default = "conf-0";
|
||||
EOF
|
||||
|
||||
for index in "${!dtb_files[@]}"; do
|
||||
fdt_reference $index
|
||||
done
|
||||
|
||||
cat <<EOF
|
||||
};
|
||||
};
|
||||
EOF
|
43
hosts/modules/hal/samsung/snow.its
Normal file
43
hosts/modules/hal/samsung/snow.its
Normal file
|
@ -0,0 +1,43 @@
|
|||
/dts-v1/;
|
||||
|
||||
/ {
|
||||
description = "U-Boot mainline";
|
||||
#address-cells = <1>;
|
||||
|
||||
images {
|
||||
kernel {
|
||||
description = "U-Boot mainline ";
|
||||
type = "kernel_noload";
|
||||
arch = "arm";
|
||||
os = "linux";
|
||||
data = /incbin/("u-boot");
|
||||
compression = "none";
|
||||
load = <0>;
|
||||
entry = <0>;
|
||||
hash-2 {
|
||||
algo = "sha256";
|
||||
};
|
||||
};
|
||||
|
||||
fdt-1{
|
||||
description = "u-boot.dtb";
|
||||
data = /incbin/("u-boot.dtb");
|
||||
type = "flat_dt";
|
||||
arch = "arm";
|
||||
compression = "none";
|
||||
hash-1{
|
||||
algo = "sha256";
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
configurations {
|
||||
default = "config-1";
|
||||
config-1 {
|
||||
description = "Boot U-Boot";
|
||||
kernel = "kernel";
|
||||
fdt = "fdt-1";
|
||||
};
|
||||
};
|
||||
};
|
||||
|
|
@ -58,6 +58,15 @@ in
|
|||
default = (16 * 1024 * 1024 - 34 * 512) * 1024 * 1024 - 1;
|
||||
type = types.nullOr types.int;
|
||||
};
|
||||
sane.image.platformPartSize = mkOption {
|
||||
default = null;
|
||||
type = types.nullOr types.int;
|
||||
description = ''
|
||||
size of the platform firmware (or, bootloader) partition, in bytes.
|
||||
most platforms don't need this. the primary user is "depthcharge" chromebooks.
|
||||
the partition contents is taken from `config.system.build.platformPartition`.
|
||||
'';
|
||||
};
|
||||
sane.image.bootPartSize = mkOption {
|
||||
default = 1024 * 1024 * 1024;
|
||||
type = types.int;
|
||||
|
@ -168,6 +177,15 @@ in
|
|||
headerHole = cfg.extraGPTPadding;
|
||||
partitions = [
|
||||
(pkgs.imageBuilder.gap cfg.firstPartGap)
|
||||
] ++ lib.optionals (cfg.platformPartSize != null) [
|
||||
{
|
||||
name = "kernel"; #< TODO: is it safe to rename this?
|
||||
filename = "${config.system.build.platformPartition}";
|
||||
# from: <https://www.chromium.org/chromium-os/chromiumos-design-docs/disk-format>
|
||||
partitionType = "FE3A2A5D-4F32-41A7-B725-ACCC3285A309";
|
||||
length = cfg.platformPartSize;
|
||||
}
|
||||
] ++ [
|
||||
bootFsImg
|
||||
nixFsImg
|
||||
];
|
||||
|
|
Loading…
Reference in New Issue
Block a user