diff --git a/src/mainboard/google/brya/variants/nereid/overridetree.cb b/src/mainboard/google/brya/variants/nereid/overridetree.cb
index 2ec605f364..65d07ca254 100644
--- a/src/mainboard/google/brya/variants/nereid/overridetree.cb
+++ b/src/mainboard/google/brya/variants/nereid/overridetree.cb
@@ -19,6 +19,21 @@ chip soc/intel/alderlake
 	register "usb2_ports[6]" = "USB2_PORT_MID(OC_SKIP)"	# WFC
 	register "usb2_ports[7]" = "USB2_PORT_MID(OC_SKIP)"	# Bluetooth port for PCIe WLAN
 
+        # Configure external V1P05/Vnn/VnnSx Rails
+        register "ext_fivr_settings" = "{
+                .configure_ext_fivr = 1,
+                .v1p05_enable_bitmap = FIVR_ENABLE_ALL_SX,
+                .vnn_enable_bitmap = FIVR_ENABLE_ALL_SX,
+                .vnn_sx_enable_bitmap = FIVR_ENABLE_ALL_SX,
+                .v1p05_supported_voltage_bitmap = FIVR_VOLTAGE_NORMAL,
+                .vnn_supported_voltage_bitmap = FIVR_VOLTAGE_MIN_ACTIVE,
+                .v1p05_voltage_mv = 1050,
+                .vnn_voltage_mv = 780,
+                .vnn_sx_voltage_mv = 1050,
+                .v1p05_icc_max_ma = 500,
+                .vnn_icc_max_ma = 500,
+        }"
+
 	device domain 0 on
 		device ref i2c1 on
 			chip drivers/i2c/hid