starfive-visionfive2: Add README.md

starfive/visionfive/v2/README.md

@@ -1,5 +1,56 @@
-# Creating SD-Image
+# Creating a SD-Image
 
+Create and configure the `flake.nix` file:
 ``` nix
+{
+  # Kernel is broken on riscv64 see https://github.com/NixOS/nixpkgs/issues/225756
+  inputs.nixpkgs.url =
+    "github:nixos/nixpkgs/c3e12e57c3e3d5c84cc500420be4507b3de33e90";
+  inputs.nixos-hardware.url = "github:nixos/nixos-hardware";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  outputs = { self, nixpkgs, nixos-hardware, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      rec {
+        packages.default = packages.sd-image;
+        packages.sd-image = (import "${nixpkgs}/nixos" {
+          configuration =
+            { config, ... }: {
+              imports = [
+                "${nixos-hardware}/starfive/visionfive/v2/sd-image-installer.nix"
+              ];
 
+              # If you want to use ssh set a password
+              # users.users.nixos.password = "super secure password";
+              # OR add your public ssh key
+              # users.users.nixos.openssh.authorizedKeys.keys = [ "ssh-rsa ..." ];
+
+              # AND configure networking
+              # networking.interfaces.end0.useDHCP = true;
+              # networking.interfaces.end1.useDHCP = true;
+
+              # If you have the 2A variant uncomment the following line
+              # hardware.deviceTree.name =
+              #   lib.mkDefault "starfive/jh7110-starfive-visionfive-2-v1.2a.dtb";
+
+              # Additional configuration goes here
+
+              sdImage.compressImage = false;
+
+              nixpkgs.crossSystem = {
+                config = "riscv64-unknown-linux-gnu";
+                system = "riscv64-linux";
+              };
+
+              system.stateVersion = "23.05";
+            };
+          inherit system;
+        }).config.system.build.sdImage;
+      });
+}
+```
+
+Build the sd image.
+
+``` sh
+nix build .#
 ```