firmware: Working Pi 3 firmware

2024-08-31 23:08:26 +01:00
parent 8c9e57f97b
commit 336c4267c8
11 changed files with 466 additions and 18 deletions
--- a/firmware/target/rpi3.nix
+++ b/firmware/target/rpi3.nix
@@ -1,8 +1,85 @@
-{ pkgs, modulesPath, config, ... }: {
-  imports = [
-    "${modulesPath}/installer/sd-card/sd-image-aarch64.nix"
-  ];
-
+{ pkgs, config, ... }: {
  nixpkgs.system = "aarch64-linux";
-  my.build.image = config.system.build.sdImage;
+
+  boot = {
+    kernelParams = [
+      "console=ttyS1,115200n8"
+      "console=tty0"
+    ];
+
+    loader.generic-extlinux-compatible = {
+      enable = true;
+      configurationLimit = 3;
+    };
+  };
+
+  hardware = {
+    deviceTree.filter = "*rpi-3*.dtb";
+    enableRedistributableFirmware = true;
+  };
+
+  systemd.network.links = {
+    "10-ethernet" = {
+      matchConfig.Path = "platform-3f980000.usb-usb-0:1.1.1:1.0";
+      linkConfig.Name = "ethernet";
+    };
+    "10-wifi" = {
+      matchConfig.Path = "platform-3f300000.mmc";
+      linkConfig.Name = "wifi";
+    };
+  };
+
+  my = {
+    disk = {
+      bootSize = 512;
+      persistSize = 1024;
+      rootSize = "128M";
+      imageBaseName = "qclkos-rpi3";
+
+      # Based on `nixos/modules/installer/sd-card/sd-image-aarch64.nix`
+      populateBootCommands =
+      let
+        configTxt = pkgs.writeText "config.txt" ''
+          [pi3]
+          kernel=u-boot-rpi3.bin
+
+          [pi02]
+          kernel=u-boot-rpi3.bin
+
+          # Otherwise the resolution will be weird in most cases, compared to
+          # what the pi3 firmware does by default.
+          disable_overscan=1
+
+          # Supported in newer board revisions
+          arm_boost=1
+
+          [all]
+          # Boot in 64-bit mode.
+          arm_64bit=1
+
+          # U-Boot needs this to work, regardless of whether UART is actually used or not.
+          # Look in arch/arm/mach-bcm283x/Kconfig in the U-Boot tree to see if this is still
+          # a requirement in the future.
+          enable_uart=1
+
+          # 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
+        '';
+      in ''
+        (cd ${pkgs.raspberrypifw}/share/raspberrypi/boot && cp bootcode.bin fixup*.dat start*.elf $NIX_BUILD_TOP/boot/)
+
+        # Add the config
+        cp ${configTxt} boot/config.txt
+
+        # Add pi3 specific files
+        cp ${pkgs.ubootRaspberryPi3_64bit}/u-boot.bin boot/u-boot-rpi3.bin
+        cp ${pkgs.raspberrypifw}/share/raspberrypi/boot/bcm2710-rpi-2-b.dtb boot/
+        cp ${pkgs.raspberrypifw}/share/raspberrypi/boot/bcm2710-rpi-3-b.dtb boot/
+        cp ${pkgs.raspberrypifw}/share/raspberrypi/boot/bcm2710-rpi-3-b-plus.dtb boot/
+
+        ${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./boot
+      '';
+    };
+  };
 }