diff --git a/devices/turris-omnia/default.nix b/devices/turris-omnia/default.nix
index ca9cb8b..321977c 100644
--- a/devices/turris-omnia/default.nix
+++ b/devices/turris-omnia/default.nix
@@ -11,14 +11,15 @@
   };
 
   module = {pkgs, config, lib, lim, ... }:
-    let openwrt = pkgs.openwrt; in {
-          imports = [
-            ../../modules/arch/arm.nix
-            ../../modules/outputs/tftpbootlz.nix
-            ../../modules/outputs/ext4fs.nix
-            ../../modules/outputs/mbrimage.nix
-            ../../modules/outputs/extlinux.nix
-          ];
+    let openwrt = pkgs.openwrt;
+    in {
+      imports = [
+        ../../modules/arch/arm.nix
+        ../../modules/outputs/tftpboot.nix
+        ../../modules/outputs/ext4fs.nix
+        ../../modules/outputs/mbrimage.nix
+        ../../modules/outputs/extlinux.nix
+      ];
     kernel = {
       src = pkgs.pkgsBuildBuild.fetchurl {
         name = "linux.tar.gz";
@@ -116,7 +117,11 @@
           };
         };
 
-    boot.tftp.loadAddress = lim.parseInt "0x1000000";
+    boot.tftp = {
+      loadAddress = lim.parseInt "0x1000000";
+      kernelFormat = "zimage";
+      compressRoot = true;
+    };
 
     hardware = let
       mac80211 = pkgs.mac80211.override {
diff --git a/modules/outputs/tftpbootlz.nix b/modules/outputs/tftpbootlz.nix
deleted file mode 100644
index ff4dc88..0000000
--- a/modules/outputs/tftpbootlz.nix
+++ /dev/null
@@ -1,94 +0,0 @@
-{
-  config
-, pkgs
-, lib
-, ...
-}:
-let
-  inherit (lib) mkOption types concatStringsSep;
-  inherit (pkgs.lib.trivial) toHexString;
-  o = config.system.outputs;
-  cmdline = concatStringsSep " " config.boot.commandLine;
-  cfg = config.boot.tftp;
-  tftpbootlz =
-    pkgs.buildPackages.runCommand "tftpbootlz" {
-      nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc ];
-    } ''
-      binsize() { local s=$(stat -L -c %s $1); echo $(($s + 0x1000 &(~0xfff))); }
-      binsize64k() { local s=$(stat -L -c %s $1); echo $(($s + 0x10000 &(~0xffff))); }
-      hex() { printf "0x%x" $1; }
-
-      kernelStart=${toString cfg.loadAddress}
-      kernelSize=$(binsize ${o.zimage})
-      mkdir -p $out
-      cat ${o.dtb} > $out/dtb
-      fdtput -p -t lx $out/dtb /reserved-memory '#address-cells' 1
-      fdtput -t lx $out/dtb /reserved-memory '#size-cells' 1
-      fdtput $out/dtb /reserved-memory ranges
-      fdtput -p -t s $out/dtb /reserved-memory/phram-rootfs compatible phram
-      # can't calculate the actual address here until we know how
-      # big the dtb will be
-      fdtput -t lx $out/dtb /reserved-memory/phram-rootfs reg 0xdead 0xcafe
-      cmd="liminix ${cmdline} mtdparts=phram0:999999999999(rootfs) phram.phram=phram0,999999999999,999999999999,${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
-      fdtput -t s $out/dtb /chosen bootargs "$cmd"
-
-      dtbStart=$(($kernelStart + $kernelSize))
-      dtbSize=$(binsize $out/dtb)
-      rootfsOrigSize=$(binsize64k ${o.rootfs})
-      lzma -z9cv ${o.rootfs} > $out/rootfs.lz
-
-      rootfsLzSize=$(binsize $out/rootfs.lz)
-      rootfsLzStart=$(($dtbStart + $dtbSize))
-      rootfsOrigStart=$(($rootfsLzStart + $rootfsLzSize))
-      fdtput -t lx $out/dtb /reserved-memory/phram-rootfs reg $(printf "%x" $rootfsOrigStart) $(printf "%x"  $rootfsOrigSize)
-
-      cmd="liminix ${cmdline} mtdparts=phram0:''${rootfsOrigSize}(rootfs) phram.phram=phram0,''${rootfsOrigStart},''${rootfsOrigSize},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
-      fdtput -t s $out/dtb /chosen bootargs "$cmd"
-
-      # dtc -I dtb  -O dts  -o /dev/stdout $out/dtb | grep -A10 reserved-memory; exit 1
-
-      (cd $out;
-      ln -s ${o.zimage} zImage
-      ln -s ${o.manifest} manifest
-      ln -s ${o.kernel.headers} build)
-
-      cat > $out/boot.scr << EOF
-      setenv serverip ${cfg.serverip}
-      setenv ipaddr ${cfg.ipaddr}
-      tftpboot $(hex $kernelStart) result/zImage; tftpboot $(hex $dtbStart) result/dtb ; tftpboot $(hex $rootfsLzStart) result/rootfs.lz
-      lzmadec $(hex $rootfsLzStart) $(hex $rootfsOrigStart)
-      bootz $(hex $kernelStart) - $(hex $dtbStart)
-      EOF
-
-    '';
-in {
-  imports = [ ../ramdisk.nix ];
-  options.boot.tftp.freeSpaceBytes = mkOption {
-    type = types.int;
-    default = 0;
-  };
-  options.system.outputs = {
-    tftpbootlz = mkOption {
-      type = types.package;
-      description = ''
-        tftpbootlz
-        **********
-
-        This is a variant of the tftpboot output intended for the
-        Turris Omnia. It uses a zImage instead of a uimage, as a
-        workaround for an awkwardly low CONFIG_SYS_BOOTM_LEN setting
-        in the U-Boot build for the device which means it won't boot
-        uimages unless they're teeny tiny.
-
-        As a bonus, it also uses lzma compression on the rootfs,
-        which reduces a 20MB ext4 image to around 4MB
-      '';
-    };
-  };
-  config = {
-    boot.ramdisk.enable = true;
-    system.outputs = {
-      inherit tftpbootlz;
-    };
-  };
-}