diff --git a/src/soc/rockchip/rk3399/soc.c b/src/soc/rockchip/rk3399/soc.c
index 453dc0f595..5b6ddb2b68 100644
--- a/src/soc/rockchip/rk3399/soc.c
+++ b/src/soc/rockchip/rk3399/soc.c
@@ -33,7 +33,7 @@ static void soc_init(device_t dev)
 	/* reserve bl31 image, which define in
 	 * arm-trusted-firmware/plat/rockchip/rk3399/include/platform_def.h
 	 */
-	mmio_resource(dev, 1, (0x500000 / KiB), (0x80000 / KiB));
+	mmio_resource(dev, 1, (0x10000 / KiB), (0x80000 / KiB));
 }
 
 static struct device_operations soc_ops = {