diff --git a/pr-28.patch b/pr-28.patch
new file mode 100644
index 0000000..65eb5f7
--- /dev/null
+++ b/pr-28.patch
@@ -0,0 +1,183 @@
+diff --git a/base.nix b/base.nix
+index 7eaee32..f767d5e 100644
+--- a/base.nix
++++ b/base.nix
+@@ -27,6 +27,11 @@ with lib;
+       description = "enable rngd";
+       default = false;
+     };
++    not-os.sd = mkOption {
++      type = types.bool;
++      default = false;
++      description = "enable sd image support";
++    };
+     not-os.simpleStaticIp = mkOption {
+       type = types.bool;
+       default = false;
+diff --git a/stage-1.nix b/stage-1.nix
+index 331fecd..85fda30 100644
+--- a/stage-1.nix
++++ b/stage-1.nix
+@@ -164,7 +164,9 @@ let
+     mkdir -p /mnt/nix/store/
+ 
+ 
+-    ${if config.not-os.nix then ''
++    ${if config.not-os.sd && config.not-os.nix then ''
++    mount $root /mnt
++    '' else if config.not-os.nix then ''
+     # make the store writeable
+     mkdir -p /mnt/nix/.ro-store /mnt/nix/.overlay-store /mnt/nix/store
+     mount $root /mnt/nix/.ro-store -t squashfs
+@@ -190,6 +192,11 @@ let
+   initialRamdisk = pkgs.makeInitrd {
+     contents = [ { object = bootStage1; symlink = "/init"; } ];
+   };
++  # Use for zynq_image
++  uRamdisk =  pkgs.makeInitrd {
++    makeUInitrd = true;
++    contents = [ { object = bootStage1; symlink = "/init"; } ];
++  };
+ in
+ {
+   options = {
+@@ -205,6 +212,7 @@ in
+   config = {
+     system.build.bootStage1 = bootStage1;
+     system.build.initialRamdisk = initialRamdisk;
++    system.build.uRamdisk = uRamdisk;
+     system.build.extraUtils = extraUtils;
+     boot.initrd.availableKernelModules = [ ];
+     boot.initrd.kernelModules = [ "tun" "loop" "squashfs" ] ++ (lib.optional config.not-os.nix "overlay");
+diff --git a/stage-2.nix b/stage-2.nix
+index c61f9d6..4e30d4b 100644
+--- a/stage-2.nix
++++ b/stage-2.nix
+@@ -21,6 +21,11 @@ with lib;
+         type = types.str;
+        };
+     };
++    networking.hostName = mkOption {
++      default = "";
++      type = types.strMatching
++        "^$|^[[:alnum:]]([[:alnum:]_-]{0,61}[[:alnum:]])?$";
++    };
+   };
+   config = {
+     system.build.bootStage2 = pkgs.substituteAll {
+diff --git a/zynq_image.nix b/zynq_image.nix
+index 3fa23ab..484a063 100644
+--- a/zynq_image.nix
++++ b/zynq_image.nix
+@@ -1,66 +1,62 @@
+ { config, pkgs, ... }:
+ 
+ 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 {
++  crosspkgs = import pkgs.path {
++    system = "x86_64-linux";
++    crossSystem = {
++      system = "armv7l-linux";
++      linux-kernel = {
++        name = "zynq";
++        baseConfig = "multi_v7_defconfig";
++        target = "uImage";
++        installTarget = "uImage";
++        autoModules = false;
++        DTB = true;
++        makeFlags = [ "LOADADDR=0x8000" ];
++      };
++    };
++  };
++  customKernel = (crosspkgs.linux.override {
+     extraConfig = ''
+       OVERLAY_FS y
+     '';
+-  };
+-  customKernelPackages = pkgs.linuxPackagesFor customKernel;
++  }).overrideAttrs (oa: {
++    postInstall = ''
++      cp arch/arm/boot/uImage $out
++      ${oa.postInstall}
++    '';
++  });
++  customKernelPackages = crosspkgs.linuxPackagesFor customKernel;
+ in {
+   imports = [ ./arm32-cross-fixes.nix ];
+   boot.kernelPackages = customKernelPackages;
+   nixpkgs.system = "armv7l-linux";
+-  system.build.zynq_image = let
+-    cmdline = "root=/dev/mmcblk0 console=ttyPS0,115200n8 systemConfig=${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" ];
++  networking.hostName = "zynq";
++  not-os.sd = true;
++  system.build.zynq_image = pkgs.runCommand "zynq_image" {
+     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 .
++    cp -s ${config.system.build.kernel}/uImage .
++    cp -s ${config.system.build.uRamdisk}/initrd uRamdisk.image.gz
++    cp -s ${config.system.build.kernel}/dtbs/zynq-zc706.dtb devicetree.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 = "";
++  environment = {
++    systemPackages = with pkgs; [ strace inetutils ];
++    etc = {
++      "service/getty/run".source = pkgs.writeShellScript "getty" ''
++        hostname ${config.networking.hostName}
++        agetty ttyPS0 115200
++      '';
++      "pam.d/other".text = ''
++        auth     sufficient pam_permit.so
++        account  required pam_permit.so
++        password required pam_permit.so
++        session  optional pam_env.so
++      '';
++      "security/pam_env.conf".text = "";
++    };
++  };
+ }