diff --git a/configs/rock-pi-n8-rk3288_defconfig b/configs/rock-pi-n8-rk3288_defconfig
index 4ed98c0..18c6d1b 100644
--- a/configs/rock-pi-n8-rk3288_defconfig
+++ b/configs/rock-pi-n8-rk3288_defconfig
@@ -74,6 +74,7 @@
 CONFIG_SPL_RAM=y
 # CONFIG_RAM_ROCKCHIP_DEBUG is not set
 CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYS_NS16550_MEM32=y
 CONFIG_SYSRESET=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y