Index: sys/powerpc/ofw/ofw_machdep.c
===================================================================
--- sys/powerpc/ofw/ofw_machdep.c
+++ sys/powerpc/ofw/ofw_machdep.c
@@ -302,10 +302,24 @@
 	size = OF_getprop(chosen, "linux,initrd-start", &start, sizeof(start));
 	if (size <= 0)
 		return (asz);
+	/* if OF_getprop returns 32-bit values, we need to adjust */
+	if (size == 4)
+#if BYTE_ORDER == LITTLE_ENDIAN
+		start &= 0xffffffff;
+#else
+		start >>= 32;
+#endif
 
 	size = OF_getprop(chosen, "linux,initrd-end", &end, sizeof(end));
 	if (size <= 0)
 		return (asz);
+	/* if OF_getprop returns 32-bit values, we need to adjust */
+	if (size == 4)
+#if BYTE_ORDER == LITTLE_ENDIAN
+		end &= 0xffffffff;
+#else
+		end >>= 32;
+#endif
 
 	initrdmap[0].mr_start = start;
 	initrdmap[0].mr_size = end - start;