diff --git a/src/soc/rockchip/common/cbmem.c b/src/soc/rockchip/common/cbmem.c
index d06b292..401f8b2 100644
--- a/src/soc/rockchip/common/cbmem.c
+++ b/src/soc/rockchip/common/cbmem.c
@@ -14,11 +14,13 @@
  */
 
 #include <cbmem.h>
-#include <stddef.h>
-#include <symbols.h>
+#include <soc/addressmap.h>
 #include <soc/sdram.h>
+#include <stdlib.h>
+#include <symbols.h>
 
 void *cbmem_top(void)
 {
-	return _dram + sdram_size_mb()*MiB;
+	return (void *)min((uintptr_t)_dram + sdram_size_mb() * MiB,
+			   MAX_DRAM_ADDRESS);
 }