diff --git a/apple-silicon-support/modules/boot-m1n1/default.nix b/apple-silicon-support/modules/boot-m1n1/default.nix
index ccbd40bd..2ac33d99 100644
--- a/apple-silicon-support/modules/boot-m1n1/default.nix
+++ b/apple-silicon-support/modules/boot-m1n1/default.nix
@@ -10,6 +10,7 @@ let
 
   bootUBoot = pkgs'.uboot-asahi.override {
     m1n1 = bootM1n1;
+    appendConfig = config.boot.ubootExtraConfig;
   };
 
   bootFiles = {
@@ -51,5 +52,14 @@ in {
         Custom logo to build into m1n1. The path must point to a 256x256 PNG.
       '';
     };
+
+    ubootExtraConfig = lib.mkOption {
+      type = lib.types.str;
+      default = "";
+      description = ''
+        Append extra options to the u-boot build command. Useful for customizing
+        the u-boot binary for custom functionality.
+      '';
+    };
   };
 }
diff --git a/apple-silicon-support/packages/uboot-asahi/default.nix b/apple-silicon-support/packages/uboot-asahi/default.nix
index 05098ac8..c9182c47 100644
--- a/apple-silicon-support/packages/uboot-asahi/default.nix
+++ b/apple-silicon-support/packages/uboot-asahi/default.nix
@@ -2,6 +2,7 @@
 , fetchFromGitHub
 , buildUBoot
 , m1n1
+, appendConfig ? ""
 }:
 
 (buildUBoot rec {
@@ -27,6 +28,8 @@
     CONFIG_VIDEO_FONT_SUN12X22=n
     CONFIG_VIDEO_FONT_16X32=y
     CONFIG_CMD_BOOTMENU=y
+
+    ${appendConfig}
   '';
 }).overrideAttrs (o: {
   # nixos's downstream patches are not applicable