Index: kernel/generic/src/mm/frame.c
===================================================================
--- kernel/generic/src/mm/frame.c	(revision ddcc8a0d63f8ff64bcff9151c6d65b103343d22c)
+++ kernel/generic/src/mm/frame.c	(revision c6f1908ecbced40d641beac151a51af7725f49d0)
@@ -865,4 +865,13 @@
 {
 	return (count * sizeof(frame_t) + buddy_conf_size(fnzb(count)));
+}
+
+/** Allocate external configuration frames from low memory. */
+pfn_t zone_external_conf_alloc(size_t count)
+{
+	size_t size = zone_conf_size(count);
+	size_t order = ispwr2(size) ? fnzb(size) : (fnzb(size) + 1);
+
+	return ADDR2PFN((uintptr_t) frame_alloc(order, FRAME_LOWMEM));
 }