diff --git a/src/soc/rockchip/rk3288/cbmem.c b/src/soc/rockchip/rk3288/cbmem.c
new file mode 100644
index 0000000..b29c87a
--- /dev/null
+++ b/src/soc/rockchip/rk3288/cbmem.c
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stddef.h>
+#include <cbmem.h>
+
+#define FB_SIZE_MB	4
+void *cbmem_top(void)
+{
+	return (void *)(CONFIG_SYS_SDRAM_BASE +
+			(CONFIG_DRAM_SIZE_MB - FB_SIZE_MB)*MiB);
+}
+