outputs.zimage -> outputs.kernel.zImage

remove config option/derivation in favour of accessing
as output of the kernel derivation (matches what we do
with e.g. modulesupport)

modules/outputs/extlinux.nix

@@ -24,7 +24,7 @@ in {
       cd $out
       ${if wantsDtb then "cp ${o.dtb} dtb" else "true"}
       cp ${o.initramfs} initramfs
-      cp ${o.zimage} kernel
+      cp ${o.kernel.zImage} kernel
       mkdir extlinux
       cat > extlinux/extlinux.conf << _EOF
       menu title Liminix

modules/outputs/tftpboot.nix

@@ -61,7 +61,7 @@ in {
           o = config.system.outputs;
           image = let choices = {
             uimage = o.uimage;
-            zimage = o.zimage;
+            zimage = o.kernel.zImage;
           }; in choices.${cfg.kernelFormat};
           bootCommand = let choices = {
             uimage = "bootm";