diff --git a/nixos/modules/system/boot/stage-1-init.sh b/nixos/modules/system/boot/stage-1-init.sh
index 51828c5c090b..2b5d547353f8 100644
--- a/nixos/modules/system/boot/stage-1-init.sh
+++ b/nixos/modules/system/boot/stage-1-init.sh
@@ -149,6 +149,10 @@ udevadm trigger --action=add
 udevadm settle
 
 
+# Additional devices initialization.
+@postEarlyDeviceCommands@
+
+
 # Load boot-time keymap before any LVM/LUKS initialization
 @extraUtils@/bin/busybox loadkmap < "@busyboxKeymap@"
 
diff --git a/nixos/modules/system/boot/stage-1.nix b/nixos/modules/system/boot/stage-1.nix
index ace2d10ec9c1..4399123f0c3c 100644
--- a/nixos/modules/system/boot/stage-1.nix
+++ b/nixos/modules/system/boot/stage-1.nix
@@ -203,7 +203,7 @@ let
     inherit (config.boot) resumeDevice devSize runSize;
 
     inherit (config.boot.initrd) checkJournalingFS
-      preLVMCommands postDeviceCommands postMountCommands kernelModules;
+      postEarlyDeviceCommands preLVMCommands postDeviceCommands postMountCommands kernelModules;
 
     resumeDevices = map (sd: if sd ? device then sd.device else "/dev/disk/by-label/${sd.label}")
                     (filter (sd: sd ? label || hasPrefix "/dev/" sd.device) config.swapDevices);
@@ -313,6 +313,14 @@ in
       '';
     };
 
+    boot.initrd.postEarlyDeviceCommands = mkOption {
+      default = "";
+      type = types.lines;
+      description = ''
+        Shell commands to be executed early after creation of device nodes.
+      '';
+    };
+
     boot.initrd.postMountCommands = mkOption {
       default = "";
       type = types.lines;