diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..94ad118
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,248 @@
+{
+  description = "Bare-metal Rust on Zynq-7000";
+
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-21.11;
+  inputs.mozilla-overlay = { url = github:mozilla/nixpkgs-mozilla; flake = false; };
+
+  outputs = { self, nixpkgs, mozilla-overlay }:
+    let
+      pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ (import mozilla-overlay) ]; };
+      
+      # ==== rustPlatform
+      let
+        rustManifest = pkgs.fetchurl {
+          url = "https://static.rust-lang.org/dist/2021-01-29/channel-rust-nightly.toml";
+          sha256 = "sha256-T0D0ypXA+nuH7o3AHCokzSBZAvQxvef4x9+XxO3aBao=";
+        };
+        targets = [];
+        rustChannelOfTargets = _channel: _date: targets:
+          (pkgs.lib.rustLib.fromManifestFile rustManifest {
+            inherit (pkgs) stdenv lib fetchurl patchelf;
+            }).rust.override {
+            inherit targets;
+            extensions = ["rust-src"];
+          };
+        rust = rustChannelOfTargets "nightly" null targets;
+      in
+        rustPlatform = pkgs.recurseIntoAttrs (pkgs.makeRustPlatform {
+          rustc = rust;
+          cargo = rust;
+        });
+      # ==== rustPlatform / gnutoolchain
+      gnutoolchain = {
+        let
+          gnu-platform = "arm-none-eabi";
+
+          binutils-pkg = { extraConfigureFlags ? [] }: pkgs.stdenv.mkDerivation rec {
+            basename = "binutils";
+            version = "2.30";
+            name = "${basename}-${gnu-platform}-${version}";
+            src = pkgs.fetchurl {
+              url = "https://ftp.gnu.org/gnu/binutils/binutils-${version}.tar.bz2";
+              sha256 = "028cklfqaab24glva1ks2aqa1zxa6w6xmc8q34zs1sb7h22dxspg";
+            };
+            configureFlags = [
+              "--enable-deterministic-archives"
+              "--target=${gnu-platform}"
+              "--with-cpu=cortex-a9"
+              "--with-fpu=vfpv3"
+              "--with-float=hard"
+              "--with-mode=thumb"
+            ] ++ extraConfigureFlags;
+            outputs = [ "out" "info" "man" ];
+            depsBuildBuild = [ pkgs.buildPackages.stdenv.cc ];
+            buildInputs = [ pkgs.lib.zlib ];
+            enableParallelBuilding = true;
+            meta = {
+              description = "Tools for manipulating binaries (linker, assembler, etc.)";
+              longDescription = ''
+                The GNU Binutils are a collection of binary tools.  The main
+                ones are `ld' (the GNU linker) and `as' (the GNU assembler).
+                They also include the BFD (Binary File Descriptor) library,
+                `gprof', `nm', `strip', etc.
+              '';
+              homepage = http://www.gnu.org/software/binutils/;
+              license = pkgs.lib.licenses.gpl3Plus;
+              /* Give binutils a lower priority than gcc-wrapper to prevent a
+                collision due to the ld/as wrappers/symlinks in the latter. */
+              priority = "10";
+            };
+          };
+
+          gcc-pkg = { platform-binutils, extraConfigureFlags ? [] }: pkgs.stdenv.mkDerivation rec {
+            basename = "gcc";
+            version = "9.1.0";
+            name = "${basename}-${gnu-platform}-${version}";
+            src = pkgs.fetchurl {
+              url = "https://ftp.gnu.org/gnu/gcc/gcc-${version}/gcc-${version}.tar.xz";
+              sha256 = "1817nc2bqdc251k0lpc51cimna7v68xjrnvqzvc50q3ax4s6i9kr";
+            };
+            preConfigure =
+            ''
+              mkdir build
+              cd build
+            '';
+            configureScript = "../configure";
+            configureFlags =
+              [ "--target=${gnu-platform}"
+                "--with-arch=armv7-a"
+                "--with-tune=cortex-a9"
+                "--with-fpu=vfpv3"
+                "--with-float=hard"
+                "--disable-libssp"
+                "--enable-languages=c"
+                "--with-as=${platform-binutils}/bin/${gnu-platform}-as"
+                "--with-ld=${platform-binutils}/bin/${gnu-platform}-ld" ] ++ extraConfigureFlags;
+            outputs = [ "out" "info" "man" ];
+            hardeningDisable = [ "format" "pie" ];
+            propagatedBuildInputs = with pkgs.libs [ gmp mpfr libmpc platform-binutils ];
+            enableParallelBuilding = true;
+            dontFixup = true;
+          };
+
+          newlib-pkg = { platform-binutils, platform-gcc }: pkgs.stdenv.mkDerivation rec {
+            pname = "newlib";
+            version = "3.1.0";
+            src = pkgs.fetchurl {
+              url = "ftp://sourceware.org/pub/newlib/newlib-${version}.tar.gz";
+              sha256 = "0ahh3n079zjp7d9wynggwrnrs27440aac04340chf1p9476a2kzv";
+            };
+            nativeBuildInputs = [ platform-binutils pkgs.platform-gcc ];
+            configureFlags = [
+              "--target=${gnu-platform}"
+
+              "--with-cpu=cortex-a9"
+              "--with-fpu=vfpv3"
+              "--with-float=hard"
+              "--with-mode=thumb"
+              "--enable-interwork"
+              "--disable-multilib"
+
+              "--disable-newlib-supplied-syscalls"
+              "--with-gnu-ld"
+              "--with-gnu-as"
+              "--disable-newlib-io-float"
+              "--disable-werror"
+            ];
+            dontFixup = true;
+          };
+        in rec {
+          binutils-bootstrap = pkgs.callPackage binutils-pkg { };
+          gcc-bootstrap = pkgs.callPackage gcc-pkg {
+            platform-binutils = binutils-bootstrap;
+            extraConfigureFlags = [ "--disable-libgcc" ];
+          };
+          newlib = pkgs.callPackage newlib-pkg {
+            platform-binutils = binutils-bootstrap;
+            platform-gcc = gcc-bootstrap;
+          };
+          binutils = pkgs.callPackage binutils-pkg {
+            extraConfigureFlags = [ "--with-lib-path=${newlib}/arm-none-eabi/lib" ];
+          };
+          gcc = pkgs.callPackage gcc-pkg {
+            platform-binutils = binutils;
+            extraConfigureFlags = [ "--enable-newlib" "--with-headers=${newlib}/arm-none-eabi/include" ];
+          };
+        }
+      }
+      # ==== gnutoolchain/cargo-xbuild
+      cargo-xbuild = rustPlatform.buildRustPackage rec {
+        pname = "cargo-xbuild";
+        version = "0.6.5";
+
+        src = pkgs.fetchFromGitHub {
+          owner = "rust-osdev";
+          repo = pname;
+          rev = "v${version}";
+          sha256 = "18djvygq9v8rmfchvi2hfj0i6fhn36m716vqndqnj56fiqviwxvf";
+        };
+        cargoLock = {
+          lockFile = [ ./Cargo.lock ]
+        }
+        meta = with pkgs.lib; {
+          description = "Automatically cross-compiles the sysroot crates core, compiler_builtins, and alloc";
+          homepage = "https://github.com/rust-osdev/cargo-xbuild";
+          license = with licenses; [ mit asl20 ];
+          maintainers = with maintainers; [ johntitor xrelkd ];
+        };
+      }
+      # ==== cargo-xbuild/mkbootimage
+      mkbootimage = pkgs.stdenv.mkDerivation {
+        pname = "mkbootimage";
+        version = "2.2";
+
+        src = pkgs.fetchFromGitHub {
+          owner = "antmicro";
+          repo = "zynq-mkbootimage";
+          rev = "4ee42d782a9ba65725ed165a4916853224a8edf7";
+          sha256 = "1k1mbsngqadqihzjgvwvsrkvryxy5ladpxd9yh9iqn2s7fxqwqa9";
+        };
+
+        propagatedBuildInputs = [ pkgs.libelf pkgs.pcre ];
+        patchPhase =
+        ''
+          substituteInPlace Makefile --replace "git rev-parse --short HEAD" "echo nix"
+        '';
+        installPhase =
+        ''
+          mkdir -p $out/bin
+          cp mkbootimage $out/bin
+        '';
+      }
+      # ==== mkbootimage/fsbl
+      fsbl = { board ? "zc706" }: pkgs.stdenv.mkDerivation {
+        name = "${board}-fsbl";
+        src = pkgs.fetchFromGitHub {
+          owner = "Xilinx";
+          repo = "embeddedsw";
+          rev = "65c849ed46c88c67457e1fc742744f96db968ff1";
+          sha256 = "1rvl06ha40dzd6s9aa4sylmksh4xb9dqaxq462lffv1fdk342pda";
+        };
+        patches = [ ./fsbl.patch ];
+        nativeBuildInputs = [
+          pkgs.gnumake
+          gnutoolchain.binutils
+          gnutoolchain.gcc
+        ];
+        patchPhase = ''
+          patch -p1 -i ${./fsbl.patch}
+          patchShebangs lib/sw_apps/zynq_fsbl/misc/copy_bsp.sh
+          echo 'SEARCH_DIR("${gnutoolchain.newlib}/arm-none-eabi/lib");' >> lib/sw_apps/zynq_fsbl/src/lscript.ld
+        '';
+        buildPhase = ''
+          cd lib/sw_apps/zynq_fsbl/src
+          make BOARD=${board} "CFLAGS=-DFSBL_DEBUG_INFO -g"
+        '';
+        installPhase = ''
+          mkdir $out
+          cp fsbl.elf $out
+        '';
+        doCheck = false;
+        dontFixup = true;
+      }
+    # ==== fsbl/
+    in {
+      packages.x86_64-linux = {
+        
+      };
+
+      hydraJobs = {
+        
+      };
+
+      devShell.x86_64-linux = pkgs.mkShell {
+        name = "zynq-rs-dev-shell";
+        buildInputs = with pkgs; [
+          rustPlatform.rust.rustc
+          rustPlatform.rust.cargo
+          cacert
+          cargo-xbuild
+
+          openocd gdb
+          openssh rsync
+          llvmPackages_9.clang-unwrapped
+          mkbootimage
+        };
+      defaultPackage.x86_64-linux = zynq-rs;
+    };
+}
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