Also add a shell.nix

default.nix

@@ -0,0 +1,27 @@
+{
+  devShell = pkgs: with pkgs; mkShell {
+      buildInputs = [
+        remarkable-toolchain
+        (rust-bin.stable.latest.default.override {
+          targets = [ "armv7-unknown-linux-gnueabihf" ];
+          extensions = [ "rust-src" ];
+        })
+        openssl.dev
+        pkg-config
+        cargo-watch
+        cargo-limit
+        shellcheck
+        lz4
+      ];
+      CARGO_BUILD_TARGET="armv7-unknown-linux-gnueabihf";
+      CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER="${pkgs.remarkable-toolchain}/sysroots/x86_64-codexsdk-linux/usr/bin/arm-remarkable-linux-gnueabi/arm-remarkable-linux-gnueabi-gcc";
+      CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_RUSTFLAGS=[
+        "-C link-arg=-march=armv7-a"
+        "-C link-arg=-marm"
+        "-C link-arg=-mfpu=neon"
+        "-C link-arg=-mfloat-abi=hard"
+        "-C link-arg=-mcpu=cortex-a9"
+        "-C link-arg=--sysroot=${pkgs.remarkable-toolchain}/sysroots/cortexa9hf-neon-remarkable-linux-gnueabi"
+      ];
+    };
+}