diff --git a/common/image.c b/common/image.c
index 6d8833e..ea59730 100644
--- a/common/image.c
+++ b/common/image.c
@@ -433,17 +433,23 @@ ulong getenv_bootm_low(void)
 
 phys_size_t getenv_bootm_size(void)
 {
+	phys_size_t tmp;
 	char *s = getenv ("bootm_size");
 	if (s) {
-		phys_size_t tmp;
 		tmp = (phys_size_t)simple_strtoull (s, NULL, 16);
 		return tmp;
 	}
+	s = getenv("bootm_low");
+	if (s)
+		tmp = (phys_size_t)simple_strtoull (s, NULL, 16);
+	else
+		tmp = 0;
+
 
 #if defined(CONFIG_ARM)
-	return gd->bd->bi_dram[0].size;
+	return gd->bd->bi_dram[0].size - tmp;
 #else
-	return gd->bd->bi_memsize;
+	return gd->bd->bi_memsize - tmp;
 #endif
 }