diff --git a/external/mambo/skiboot.tcl b/external/mambo/skiboot.tcl
index f4068fac0a20..5a5176fafe4c 100644
--- a/external/mambo/skiboot.tcl
+++ b/external/mambo/skiboot.tcl
@@ -222,6 +222,11 @@ mysim of addprop $reserved_memory int "#size-cells" 2
 mysim of addprop $reserved_memory int "#address-cells" 2
 mysim of addprop $reserved_memory empty "ranges" ""
 
+set initramfs_res [mysim of addchild $reserved_memory "initramfs" ""]
+set reg [list $cpio_start $cpio_size ]
+mysim of addprop $initramfs_res array64 "reg" reg
+mysim of addprop $initramfs_res empty "name" "initramfs"
+
 set fake_nvram_node [mysim of addchild $reserved_memory "ibm,fake-nvram" ""]
 set reg [list $fake_nvram_start $fake_nvram_size ]
 mysim of addprop $fake_nvram_node array64 "reg" reg