armv7 build for Raspberry Pi 2B

hardware/raspberry_pi_2_model_B.nix

@@ -1,10 +1,11 @@
-# Configuration common to all Raspberry Pi 3 Model B devices
+# Configuration common to all Raspberry Pi 2 Model B devices
 
 { config, pkgs, lib, ... }:
 
 {
 
   boot = {
+    consoleLogLevel = lib.mkDefault 7;
     initrd = {
       availableKernelModules = [
         "bcm2835_dma"   # Allows early (earlier) mode setting
@@ -68,6 +69,8 @@
     enableB43Firmware = false;   # If true, enable Pi wireless firmware
   };
 
+  sound.enable = false;   # Disable sound.
+
   environment.systemPackages = with pkgs; [
     raspberrypi-tools   # Userland tools for the Raspberry Pi board
   ];

hosts/paidh-aon.nix

@@ -0,0 +1,15 @@
+# NixOps configuration for pàidh-aon
+
+{ config, pkgs, lib, ... }:
+
+{
+  imports = [
+    ../clusters/pi2B_rack.nix
+  ];
+
+  # Comment out deployment when building the SD Image.
+  #deployment.targetHost = "10.69.0.201";
+  networking.hostName = "paidh-aon";      # Define your hostname.
+
+  system.stateVersion = "20.03";       # The version of NixOS originally installed
+}

images/sd-image_paidh-armv7.nix

@@ -14,7 +14,7 @@ in
 {
   imports = [
     <nixpkgs/nixos/modules/profiles/base.nix>
-    <nixpkgs/nixos/modules/installer/cd-dvd/sd-image-armv7l-multiplatform.nix>
+    <nixpkgs/nixos/modules/installer/cd-dvd/sd-image.nix>
   ];
 
   boot.consoleLogLevel = lib.mkDefault 7;
@@ -25,6 +25,13 @@ in
         # 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
+
+        # 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/)