initial commit

.gitignore

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+result

flake.lock

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+{
+  "nodes": {
+    "firmware": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1697732010,
+        "narHash": "sha256-kGXbqkqHCPU2Xz6az3LtdAccVzGtlq+vnTLiR3Xl9+8=",
+        "owner": "raspberrypi",
+        "repo": "firmware",
+        "rev": "ce3a0b4197eaf311ba0734efdb9f5bdedefe5e27",
+        "type": "github"
+      },
+      "original": {
+        "owner": "raspberrypi",
+        "repo": "firmware",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1697730408,
+        "narHash": "sha256-Ww//zzukdTrwTrCUkaJA/NsaLEfUfQpWZXBdXBYfhak=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ff0a5a776b56e0ca32d47a4a47695452ec7f7d80",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "not-os": {
+      "inputs": {
+        "firmware": "firmware",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1699416673,
+        "narHash": "sha256-uJ6QnU7hFUYZsz6J/HIBEpLW0bS7GLQOo6ccKtoZ68k=",
+        "owner": "cleverca22",
+        "repo": "not-os",
+        "rev": "79ff6e6fe0b64bf8b8d38363b2bb0dea0cd5a686",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cleverca22",
+        "repo": "not-os",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "not-os": "not-os"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Not-OS port to the Zynq-7000 platform";
+  
+  inputs.not-os.url = github:cleverca22/not-os;
+  
+  outputs = { self, not-os }: {
+    packages.armv7l-linux = let
+      platforms = (import not-os.inputs.nixpkgs { config = {}; }).platforms;
+      eval = (import "${not-os}" {
+        extraModules = [
+          ./zynq_image.nix
+        ];
+        platform = system: platforms.armv7l-hf-multiplatform;
+        system = "x86_64-linux";
+        crossSystem.system = "armv7l-linux";
+        inherit (not-os.inputs) nixpkgs;
+      });
+    in {
+      zynq_image = eval.config.system.build.zynq_image;
+    };
+  };
+}

zynq_image.nix

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+{ config, pkgs, ... }:
+
+# Copy of zynq_image.nix from https://github.com/cleverca22/not-os with added patch
+
+let
+  # dont use overlays for the qemu, it causes a lot of wasted time on recompiles
+  x86pkgs = import pkgs.path { system = "x86_64-linux"; };
+  customKernel = pkgs.linux.override {
+    extraConfig = ''
+      OVERLAY_FS y
+    '';
+  };
+  customKernelPackages = pkgs.linuxPackagesFor customKernel;
+in {
+  boot.kernelPackages = customKernelPackages;
+  nixpkgs.system = "armv7l-linux";
+  system.build.zynq_image = let
+    cmdline = "root=/dev/mmcblk0 console=ttyPS0,115200n8 systemConfig=${builtins.unsafeDiscardStringContext config.system.build.toplevel}";
+    qemuScript = ''
+      #!/bin/bash -v
+      export PATH=${x86pkgs.qemu}/bin:$PATH
+      set -x
+      base=$(dirname $0)
+
+      cp $base/root.squashfs /tmp/
+      chmod +w /tmp/root.squashfs
+      truncate -s 64m /tmp/root.squashfs
+
+      qemu-system-arm \
+        -M xilinx-zynq-a9 \
+        -serial /dev/null \
+        -serial stdio \
+        -display none \
+        -dtb $base/zynq-zc702.dtb \
+        -kernel $base/zImage \
+        -initrd $base/initrd \
+        -drive file=/tmp/root.squashfs,if=sd,format=raw \
+        -append "${cmdline}"
+    '';
+  in pkgs.runCommand "zynq_image" {
+    inherit qemuScript;
+    passAsFile = [ "qemuScript" ];
+    preferLocalBuild = true;
+  } ''
+    mkdir $out
+    cd $out
+    cp -s ${config.system.build.squashfs} root.squashfs
+    cp -s ${config.system.build.kernel}/*zImage .
+    cp -s ${config.system.build.initialRamdisk}/initrd initrd
+    cp -s ${config.system.build.kernel}/dtbs/zynq-zc702.dtb .
+    ln -sv ${config.system.build.toplevel} toplevel
+    cp $qemuScriptPath qemu-script
+    chmod +x qemu-script
+    patchShebangs qemu-script
+    ls -ltrh
+  '';
+  system.build.rpi_image_tar = pkgs.runCommand "dist.tar" {} ''
+    mkdir -p $out/nix-support
+    tar -cvf $out/dist.tar ${config.system.build.rpi_image}
+    echo "file binary-dist $out/dist.tar" >> $out/nix-support/hydra-build-products
+  '';
+  environment.systemPackages = [ pkgs.strace ];
+  environment.etc."service/getty/run".source = pkgs.writeShellScript "getty" ''
+    agetty ttyPS0 115200
+  '';
+  environment.etc."pam.d/other".text = "";
+
+  nixpkgs.overlays = [
+    (self: super: {
+
+      # armv7l cross-compile fixes
+      libuv = super.libuv.overrideAttrs (old: {
+        doCheck = false;
+      });
+      elfutils = super.elfutils.overrideAttrs (old: {
+        doCheck = false;
+        doInstallCheck = false;
+      });
+      systemd = super.systemd.override { withEfi = false; };
+      procps = super.procps.override { withSystemd = false; };
+      nix = super.nix.override { enableDocumentation = false; };
+
+      # closure size fixes
+      openssh = super.openssh.override { withFIDO = false; withKerberos = false; };
+      util-linux = super.util-linux.override { pamSupport=false; capabilitiesSupport=false; ncursesSupport=false; systemdSupport=false; nlsSupport=false; translateManpages=false; };
+      utillinuxCurses = self.util-linux;
+      utillinuxMinimal = self.util-linux;
+    })
+  ];
+}