nix: add firmware derivation (WIP)

nix/artiq-board.nix

@@ -0,0 +1,56 @@
+let 
+  pkgs = import <nixpkgs> {};
+  fetchcargo = import <nixpkgs/pkgs/build-support/rust/fetchcargo.nix> {
+    inherit (pkgs) stdenv cacert git rust cargo-vendor;
+  };
+  myVendoredSrcFetchCargo = fetchcargo rec {
+    name = "myVendoredSrcFetchCargo";
+    sourceRoot = null;
+    srcs = null;
+    src = ../artiq/firmware;
+    cargoUpdateHook = "";
+    patches = [];
+    sha256 = "1xzjn9i4rkd9124v2gbdplsgsvp1hlx7czdgc58n316vsnrkbr86";
+  };
+
+  myVendoredSrc = pkgs.stdenv.mkDerivation {
+    name = "myVendoredSrc";
+    src = myVendoredSrcFetchCargo;
+    phases = [ "unpackPhase" "installPhase" ];
+    installPhase = ''
+      mkdir -p $out/.cargo/registry
+      cat > $out/.cargo/config << EOF
+        [source.crates-io]
+        registry = "https://github.com/rust-lang/crates.io-index"
+        replace-with = "vendored-sources"
+
+        [source."https://github.com/m-labs/libfringe"]
+        git = "https://github.com/m-labs/libfringe"
+        rev = "b8a6d8f"
+        replace-with = "vendored-sources"
+
+        [source.vendored-sources]
+        directory = "$out/.cargo/registry"
+      EOF
+      cp -R * $out/.cargo/registry
+    '';
+  };
+
+  buildenv = import ./artiq-dev.nix { inherit pkgs; };
+
+in pkgs.stdenv.mkDerivation {
+  name = "artiq-board";
+  src = null;
+  phases = [ "buildPhase" "installPhase" ];
+  buildPhase = 
+    ''
+    ${buildenv}/bin/artiq-dev -c "HOME=${myVendoredSrc} python -m artiq.gateware.targets.kasli -V satellite --no-compile-gateware"
+    '';
+  installPhase =
+    ''
+    mkdir $out
+    #cp artiq_kasli/satellite/gateware/top.bit $out
+    cp artiq_kasli/satellite/software/bootloader/bootloader.bin $out
+    cp artiq_kasli/satellite/software/satman/satman.{elf,fbi} $out
+    '';
+}