kerrigan: add device tree, uboot fw_printenv

ops/nixos/kerrigan/default.nix

@@ -13,8 +13,19 @@ let
     };
   }) nmFiles);
 
-  boot-builder = pkgs.callPackage ./boot-builder.nix { };
+  uboot-envtools = pkgs.ubootTools.override {
-  populate-boot-builder = pkgs.buildPackages.callPackage ./boot-builder.nix { };
+    extraMakeFlags = [ "HOST_TOOLS_ALL=y" "CROSS_BUILD_TOOLS=1" "NO_SDL=1" "envtools" ];
+
+    outputs = [ "out" "man" ];
+
+    postInstall = ''
+      ln -s $out/bin/fw_printenv $out/bin/fw_setenv
+      installManPage doc/*.1
+    '';
+    filesToInstall = [
+      "tools/env/fw_printenv"
+    ];
+  };
 in
 {
   fileSystems = {
@@ -97,6 +108,7 @@ in
 
   environment.systemPackages = with pkgs; [
     libqmi screen minicom conntrack-tools modemmanager android-tools
+    uboot-envtools
   ];
   services.udev.packages = with pkgs; [
     modemmanager
@@ -119,4 +131,51 @@ in
   systemd.services."systemd-networkd-wait-online".wantedBy = lib.mkForce [];
 
   system.stateVersion = "23.05";
+
+  hardware.deviceTree = {
+    enable = true;
+    name = "marvell/armada-7040-mochabin.dtb";
+    filter = "armada-7040-mochabin.dtb";
+    overlays = [{
+      name = "spi";
+      filter = "armada-7040-mochabin.dtb";
+      dtsText = ''
+        /dts-v1/;
+        /plugin/;
+
+        / {
+          compatible = "globalscale,mochabin marvell,armada7040 marvell,armada-ap806-quad marvell,armada-ap806";
+        };
+
+        &cp0_spi1 {
+          flash@0 {
+            status = "disabled";
+          };
+          flash-real@0 {
+            #address-cells = <1>;
+            #size-cells = <1>;
+            compatible = "jedec,spi-nor";
+            reg = <0>;
+            spi-max-frequency = <20000000>;
+
+            partitions {
+              compatible = "fixed-partitions";
+              #address-cells = <1>;
+              #size-cells = <1>;
+
+              partition@0 {
+                label = "firmware";
+                reg = <0x0 0x3e0000>;
+                read-only;
+              };
+              partition@3e0000 {
+                label = "u-boot-env";
+                reg = <0x3e0000 0x20000>;
+              };
+            };
+          };
+        };
+      '';
+    }];
+  };
 }