Index: sys/powerpc/ofw/ofw_machdep.c
===================================================================
--- sys/powerpc/ofw/ofw_machdep.c
+++ sys/powerpc/ofw/ofw_machdep.c
@@ -294,7 +294,7 @@
 excise_initrd_region(struct mem_region *avail, int asz)
 {
 	phandle_t chosen;
-	uint64_t start, end;
+	uint32_t start, end;
 	ssize_t size;
 	struct mem_region initrdmap[1];
 
@@ -304,8 +304,9 @@
 		return (asz);
 
 	size = OF_getprop(chosen, "linux,initrd-end", &end, sizeof(end));
-	if (size <= 0)
+	if (size <= 0 || (end - start) == 0)
 		return (asz);
+	/* if OF_getprop returns 32-bit values, we need to adjust */
 
 	initrdmap[0].mr_start = start;
 	initrdmap[0].mr_size = end - start;