diff --git a/arch/arm/configs/rockchip_linux_defconfig b/arch/arm/configs/rockchip_linux_defconfig
index 06a4078e063a..83ea9cb3dcf6 100644
--- a/arch/arm/configs/rockchip_linux_defconfig
+++ b/arch/arm/configs/rockchip_linux_defconfig
@@ -230,6 +230,8 @@ CONFIG_DEVPTS_MULTIPLE_INSTANCES=y
 # CONFIG_DEVKMEM is not set
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_NR_UARTS=5
+CONFIG_SERIAL_8250_RUNTIME_UARTS=5
 CONFIG_SERIAL_8250_DW=y
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_HW_RANDOM=y