diff --git a/rootfs_overlay/fb.sh b/rootfs_overlay/fb.sh
new file mode 100755
index 0000000..5e2a0e4
--- /dev/null
+++ b/rootfs_overlay/fb.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+cat /dev/urandom > "/dev/fb${1:-0}"