generate probably-non-functional firmware image for gl-ar750

kernel/default.nix

@@ -34,9 +34,9 @@ let
       cp -a . $out
     '';
   };
-in
-{
+in rec {
   vmlinux = callPackage ./vmlinux.nix {
     inherit tree config checkedConfig;
   };
+  uimage = callPackage ./uimage.nix { };
 }

kernel/uimage.nix

@@ -0,0 +1,42 @@
+{
+  lzma
+, stdenv
+, ubootTools
+} :
+let
+  objcopy = "${stdenv.cc.bintools.targetPrefix}objcopy";
+in {
+  vmlinux
+# , commandLine
+# , fdt ? null
+, entryPoint
+# , extraName ? ""                # e.g. socFamily
+, loadAddress
+} :
+  # patchDtbCommand = if (fdt != null) then ''
+  #   ( cat vmlinux.stripped ${fdt} > vmlinux.tmp ) && mv vmlinux.tmp vmlinux.stripped
+  # '' else ''
+  #   echo patch-cmdline vmlinux.stripped '${commandLine}'
+  #   patch-cmdline vmlinux.stripped '${commandLine}'
+  #   echo
+  # '';
+stdenv.mkDerivation {
+  name = "kernel.image";
+  phases = [ "buildPhase" "installPhase" ];
+  nativeBuildInputs = [
+    # patchImage
+    lzma
+    stdenv.cc
+    ubootTools
+  ];
+  buildPhase = ''
+    ${objcopy} -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S ${vmlinux} vmlinux.stripped
+    # {patchDtbCommand}
+    rm -f vmlinux.stripped.lzma
+    lzma -k -z  vmlinux.stripped
+    mkimage -A mips -O linux -T kernel -C lzma -a ${loadAddress} -e ${entryPoint} -n 'MIPS Liminix Linux ' -d vmlinux.stripped.lzma kernel.image
+  '';
+  installPhase = ''
+    cp kernel.image $out
+  '';
+}