uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/embedded/fpga/trellis/default.nix

@@ -0,0 +1,72 @@
+{ lib, stdenv, fetchFromGitHub, python3, boost, cmake }:
+
+let
+  rev = "2f06397673bbca3da11928d538b8ab7d01c944c6";
+  # git describe --tags
+  realVersion = "1.0-534-g${builtins.substring 0 7 rev}";
+in stdenv.mkDerivation rec {
+  pname = "trellis";
+  version = "2021-12-14";
+
+  srcs = [
+    (fetchFromGitHub {
+       owner  = "YosysHQ";
+       repo   = "prjtrellis";
+       inherit rev;
+       hash   = "sha256-m5CalAIbzY2bhOvpBbPBeLZeDp+itk1HlRsSmtiddaA=";
+       name   = "trellis";
+     })
+
+    (fetchFromGitHub {
+      owner  = "YosysHQ";
+      repo   = "prjtrellis-db";
+      # note: the upstream submodule points to revision 0ee729d20eaf,
+      # but that's just the tip of the branch that was merged into master.
+      # fdf4bf275a is the merge commit itself
+      rev    = "fdf4bf275a7402654bc643db537173e2fbc86103";
+      sha256 = "eDq2wU2pnfK9bOkEVZ07NQPv02Dc6iB+p5GTtVBiyQA=";
+      name   = "trellis-database";
+    })
+  ];
+  sourceRoot = "trellis";
+
+  buildInputs = [ boost ];
+  nativeBuildInputs = [ cmake python3 ];
+  cmakeFlags = [
+    "-DCURRENT_GIT_VERSION=${realVersion}"
+    # TODO: should this be in stdenv instead?
+    "-DCMAKE_INSTALL_DATADIR=${placeholder "out"}/share"
+  ];
+
+  preConfigure = ''
+    rmdir database && ln -sfv ${builtins.elemAt srcs 1} ./database
+
+    cd libtrellis
+  '';
+
+  postInstall = lib.optionalString stdenv.isDarwin ''
+    for f in $out/bin/* ; do
+      install_name_tool -change "$out/lib/libtrellis.dylib" "$out/lib/trellis/libtrellis.dylib" "$f"
+    done
+  '';
+
+  doInstallCheck = true;
+
+  installCheckPhase = ''
+    $out/bin/ecppack $out/share/trellis/misc/basecfgs/empty_lfe5u-85f.config /tmp/test.bin
+  '';
+
+  meta = with lib; {
+    description     = "Documentation and bitstream tools for Lattice ECP5 FPGAs";
+    longDescription = ''
+      Project Trellis documents the Lattice ECP5 architecture
+      to enable development of open-source tools. Its goal is
+      to provide sufficient information to develop a free and
+      open Verilog to bitstream toolchain for these devices.
+    '';
+    homepage    = "https://github.com/YosysHQ/prjtrellis";
+    license     = licenses.isc;
+    maintainers = with maintainers; [ q3k thoughtpolice emily rowanG077 ];
+    platforms   = platforms.all;
+  };
+}