diff --git a/src/mainboard/google/brox/Kconfig b/src/mainboard/google/brox/Kconfig
index 3b5d335935..d48b342782 100644
--- a/src/mainboard/google/brox/Kconfig
+++ b/src/mainboard/google/brox/Kconfig
@@ -59,6 +59,11 @@ config BOARD_GOOGLE_BROX
 	select CHROMEOS_WIFI_SAR if CHROMEOS
 	select USE_UNIFIED_AP_FIRMWARE_FOR_UFS_AND_NON_UFS
 
+config BOARD_GOOGLE_BROX_RTK_EC
+	select BOARD_GOOGLE_BASEBOARD_BROX
+	select CHROMEOS_WIFI_SAR if CHROMEOS
+	select USE_UNIFIED_AP_FIRMWARE_FOR_UFS_AND_NON_UFS
+
 config BOARD_GOOGLE_BROX_TI_PDC
 	select BOARD_GOOGLE_BASEBOARD_BROX
 	select CHROMEOS_WIFI_SAR if CHROMEOS
@@ -154,12 +159,17 @@ config MAINBOARD_PART_NUMBER
 	default "Brox" if BOARD_GOOGLE_BROX
 	default "Brox_Ec_Ish" if BOARD_GOOGLE_BROX_EC_ISH
 	default "Brox_Ti_Pdc" if BOARD_GOOGLE_BROX_TI_PDC
+	default "Brox_Rtk_Ec" if BOARD_GOOGLE_BROX_RTK_EC
 	default "Greenbayupoc" if BOARD_GOOGLE_GREENBAYUPOC
 	default "Jubilant" if BOARD_GOOGLE_JUBILANT
 	default "Lotso" if BOARD_GOOGLE_LOTSO
 
 config VARIANT_DIR
-	default "brox" if BOARD_GOOGLE_BROX || BOARD_GOOGLE_BROX_EC_ISH || BOARD_GOOGLE_BROX_TI_PDC
+	default "brox" if \
+		BOARD_GOOGLE_BROX || \
+		BOARD_GOOGLE_BROX_EC_ISH || \
+		BOARD_GOOGLE_BROX_TI_PDC || \
+		BOARD_GOOGLE_BROX_RTK_EC
 	default "lotso" if BOARD_GOOGLE_LOTSO
 	default "greenbayupoc" if BOARD_GOOGLE_GREENBAYUPOC
 	default "jubilant" if BOARD_GOOGLE_JUBILANT
diff --git a/src/mainboard/google/brox/Kconfig.name b/src/mainboard/google/brox/Kconfig.name
index 10f89f431a..7820878bd2 100644
--- a/src/mainboard/google/brox/Kconfig.name
+++ b/src/mainboard/google/brox/Kconfig.name
@@ -5,6 +5,9 @@ comment "Brox"
 config BOARD_GOOGLE_BROX
 	bool "->  Brox"
 
+config BOARD_GOOGLE_BROX_RTK_EC
+	bool "->  Brox RTK EC"
+
 config BOARD_GOOGLE_BROX_EC_ISH
 	bool "->  Brox EC ISH"