diff --git a/target/linux/ramips/mt7620/config-4.4 b/target/linux/ramips/mt7620/config-4.4
index 4bc890ca84..cd90484e1e 100644
--- a/target/linux/ramips/mt7620/config-4.4
+++ b/target/linux/ramips/mt7620/config-4.4
@@ -180,7 +180,6 @@ CONFIG_SCHED_HRTICK=y
 # CONFIG_SCHED_INFO is not set
 # CONFIG_SCSI_DMA is not set
 # CONFIG_SERIAL_8250_FSL is not set
-CONFIG_SERIAL_8250_NR_UARTS=4
 CONFIG_SERIAL_8250_RT288X=y
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_SOC_MT7620=y
diff --git a/target/linux/ramips/mt7621/config-4.4 b/target/linux/ramips/mt7621/config-4.4
index 862c8e977e..58568c8114 100644
--- a/target/linux/ramips/mt7621/config-4.4
+++ b/target/linux/ramips/mt7621/config-4.4
@@ -218,7 +218,8 @@ CONFIG_SCHED_HRTICK=y
 CONFIG_SCHED_SMT=y
 # CONFIG_SCSI_DMA is not set
 # CONFIG_SERIAL_8250_FSL is not set
-CONFIG_SERIAL_8250_NR_UARTS=4
+CONFIG_SERIAL_8250_NR_UARTS=3
+CONFIG_SERIAL_8250_RUNTIME_UARTS=3
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_SMP=y
 CONFIG_SMP_UP=y
diff --git a/target/linux/ramips/mt7628/config-4.4 b/target/linux/ramips/mt7628/config-4.4
index ef282b5f00..6b04457f17 100644
--- a/target/linux/ramips/mt7628/config-4.4
+++ b/target/linux/ramips/mt7628/config-4.4
@@ -177,8 +177,8 @@ CONFIG_SCHED_HRTICK=y
 # CONFIG_SCHED_INFO is not set
 # CONFIG_SCSI_DMA is not set
 # CONFIG_SERIAL_8250_FSL is not set
-CONFIG_SERIAL_8250_NR_UARTS=4
-CONFIG_SERIAL_8250_RT288X=y
+CONFIG_SERIAL_8250_NR_UARTS=3
+CONFIG_SERIAL_8250_RUNTIME_UARTS=3
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_SOC_MT7620=y
 # CONFIG_SOC_MT7621 is not set
diff --git a/target/linux/ramips/rt288x/config-4.4 b/target/linux/ramips/rt288x/config-4.4
index 9c86e80da5..94e4cdde53 100644
--- a/target/linux/ramips/rt288x/config-4.4
+++ b/target/linux/ramips/rt288x/config-4.4
@@ -164,7 +164,6 @@ CONFIG_SCHED_HRTICK=y
 # CONFIG_SCHED_INFO is not set
 # CONFIG_SCSI_DMA is not set
 # CONFIG_SERIAL_8250_FSL is not set
-CONFIG_SERIAL_8250_NR_UARTS=4
 CONFIG_SERIAL_8250_RT288X=y
 CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_SOC_MT7620 is not set
diff --git a/target/linux/ramips/rt305x/config-4.4 b/target/linux/ramips/rt305x/config-4.4
index 4c14e3724c..9911d9249e 100644
--- a/target/linux/ramips/rt305x/config-4.4
+++ b/target/linux/ramips/rt305x/config-4.4
@@ -166,7 +166,6 @@ CONFIG_SCHED_HRTICK=y
 # CONFIG_SCHED_INFO is not set
 # CONFIG_SCSI_DMA is not set
 # CONFIG_SERIAL_8250_FSL is not set
-CONFIG_SERIAL_8250_NR_UARTS=4
 CONFIG_SERIAL_8250_RT288X=y
 CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_SOC_MT7620 is not set
diff --git a/target/linux/ramips/rt3883/config-4.4 b/target/linux/ramips/rt3883/config-4.4
index b25face30c..26f0fd9cdb 100644
--- a/target/linux/ramips/rt3883/config-4.4
+++ b/target/linux/ramips/rt3883/config-4.4
@@ -174,7 +174,6 @@ CONFIG_SCHED_HRTICK=y
 # CONFIG_SCHED_INFO is not set
 # CONFIG_SCSI_DMA is not set
 # CONFIG_SERIAL_8250_FSL is not set
-CONFIG_SERIAL_8250_NR_UARTS=4
 CONFIG_SERIAL_8250_RT288X=y
 CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_SOC_MT7620 is not set