diff --git a/configs/firefly-rk3288_defconfig b/configs/firefly-rk3288_defconfig
index 63c53a0..26967a6 100644
--- a/configs/firefly-rk3288_defconfig
+++ b/configs/firefly-rk3288_defconfig
@@ -78,6 +78,7 @@
 CONFIG_RAM=y
 CONFIG_SPL_RAM=y
 CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYS_NS16550_MEM32=y
 CONFIG_SYSRESET=y
 CONFIG_USB=y
 CONFIG_USB_DWC2=y