diff --git a/src/mainboard/google/brya/variants/marasov/overridetree.cb b/src/mainboard/google/brya/variants/marasov/overridetree.cb
index 7ceafe66d7..09af8fa1ac 100644
--- a/src/mainboard/google/brya/variants/marasov/overridetree.cb
+++ b/src/mainboard/google/brya/variants/marasov/overridetree.cb
@@ -49,6 +49,20 @@ chip soc/intel/alderlake
 		},
 	}"
 	register "sagv" = "SaGv_Enabled"
+
+	register "ext_fivr_settings" = "{
+		.configure_ext_fivr = 1,
+		.v1p05_enable_bitmap = FIVR_ENABLE_ALL_SX,
+		.vnn_enable_bitmap = FIVR_ENABLE_ALL_SX,
+		.v1p05_supported_voltage_bitmap = FIVR_VOLTAGE_NORMAL |
+							FIVR_VOLTAGE_MIN_ACTIVE |
+							FIVR_VOLTAGE_MIN_RETENTION,
+		.vnn_supported_voltage_bitmap = FIVR_VOLTAGE_NORMAL |
+							FIVR_VOLTAGE_MIN_ACTIVE |
+							FIVR_VOLTAGE_MIN_RETENTION,
+		.v1p05_icc_max_ma = 500,
+		.vnn_sx_voltage_mv = 1250,
+	}"
 	register "serial_io_i2c_mode" = "{
 		[PchSerialIoIndexI2C2] = PchSerialIoDisabled,
 	}"