diff --git a/nixos/modules/system/boot/systemd/initrd.nix b/nixos/modules/system/boot/systemd/initrd.nix
index 7f5d3ae092a7..6c1b42da1c41 100644
--- a/nixos/modules/system/boot/systemd/initrd.nix
+++ b/nixos/modules/system/boot/systemd/initrd.nix
@@ -125,6 +125,9 @@ let
   };
 
   initialRamdisk = pkgs.makeInitrdNG {
+    name = "initrd-${kernel-name}";
+    inherit (config.boot.initrd) compressor compressorArgs prepend;
+
     contents = map (path: { object = path; symlink = ""; }) (subtractLists cfg.suppressedStorePaths cfg.storePaths)
       ++ mapAttrsToList (_: v: { object = v.source; symlink = v.target; }) (filterAttrs (_: v: v.enable) cfg.contents);
   };
diff --git a/pkgs/build-support/kernel/make-initrd-ng.nix b/pkgs/build-support/kernel/make-initrd-ng.nix
index 9fd202c44847..1890bbcd173a 100644
--- a/pkgs/build-support/kernel/make-initrd-ng.nix
+++ b/pkgs/build-support/kernel/make-initrd-ng.nix
@@ -66,14 +66,28 @@ in
     compressorArgs = _compressorArgsReal;
   };
 
+  inherit extension makeUInitrd uInitrdArch prepend;
+  ${if makeUInitrd then "uInitrdCompression" else null} = uInitrdCompression;
+
   passAsFile = ["contents"];
   contents = lib.concatMapStringsSep "\n" ({ object, symlink, ... }: "${object}\n${if symlink == null then "" else symlink}") contents + "\n";
 
-  nativeBuildInputs = [makeInitrdNGTool patchelf glibc cpio];
+  nativeBuildInputs = [makeInitrdNGTool patchelf glibc cpio] ++ lib.optional makeUInitrd ubootTools;
 } ''
   mkdir ./root
   make-initrd-ng "$contentsPath" ./root
   mkdir "$out"
   (cd root && find * .[^.*] -exec touch -h -d '@1' '{}' +)
+  for PREP in $prepend; do
+    cat $PREP >> $out/initrd
+  done
   (cd root && find * .[^.*] -print0 | sort -z | cpio -o -H newc -R +0:+0 --reproducible --null | eval -- $compress >> "$out/initrd")
+
+  if [ -n "$makeUInitrd" ]; then
+      mkimage -A "$uInitrdArch" -O linux -T ramdisk -C "$uInitrdCompression" -d "$out/initrd" $out/initrd.img
+      # Compatibility symlink
+      ln -sf "initrd.img" "$out/initrd"
+  else
+      ln -s "initrd" "$out/initrd$extension"
+  fi
 ''