diff --git a/src/mainboard/system76/cfl-h/Kconfig b/src/mainboard/system76/cfl-h/Kconfig
index 7130fd7fd9..8be5f73d77 100644
--- a/src/mainboard/system76/cfl-h/Kconfig
+++ b/src/mainboard/system76/cfl-h/Kconfig
@@ -13,6 +13,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select INTEL_GMA_HAVE_VBT
 #	select MAINBOARD_HAS_SPI_TPM_CR50
 #	select MAINBOARD_HAS_TPM2
+	select NO_UART_ON_SUPERIO
 	select SOC_INTEL_CANNONLAKE_PCH_H
 	select SOC_INTEL_COFFEELAKE
 	select SOC_INTEL_COMMON_ACPI_EC_PTS_WAK
diff --git a/src/mainboard/system76/kbl-u/Kconfig b/src/mainboard/system76/kbl-u/Kconfig
index 4c745e3762..773b2ca965 100644
--- a/src/mainboard/system76/kbl-u/Kconfig
+++ b/src/mainboard/system76/kbl-u/Kconfig
@@ -16,6 +16,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_LPC_TPM
 	select MAINBOARD_HAS_TPM2
 	select MAINBOARD_USES_FSP2_0
+	select NO_UART_ON_SUPERIO
 	select SOC_INTEL_COMMON_ACPI_EC_PTS_WAK
 	select SOC_INTEL_COMMON_BLOCK_HDA_VERB
 	select SOC_INTEL_KABYLAKE
diff --git a/src/mainboard/system76/whl-u/Kconfig b/src/mainboard/system76/whl-u/Kconfig
index 5e423b189a..266fcdc7a1 100644
--- a/src/mainboard/system76/whl-u/Kconfig
+++ b/src/mainboard/system76/whl-u/Kconfig
@@ -15,6 +15,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select INTEL_GMA_HAVE_VBT
 #	select MAINBOARD_HAS_SPI_TPM_CR50
 #	select MAINBOARD_HAS_TPM2
+	select NO_UART_ON_SUPERIO
 	select SOC_INTEL_COMMON_ACPI_EC_PTS_WAK
 	select SOC_INTEL_COMMON_BLOCK_HDA
 	select SOC_INTEL_COMMON_BLOCK_HDA_VERB