diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat
index e927ee16d5e6e..6b10b566d18ee 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Airvolute-DCS2/hwdef.dat
@@ -127,8 +127,10 @@ PB11 ETH_RMII_TX_EN     ETH1
 PA7  ETH_RMII_CRS_DV    ETH1
 PA1  ETH_RMII_REF_CLK   ETH1
 
-define BOARD_PHY_ID MII_LAN8742A_ID
 define BOARD_PHY_RMII
+define BOARD_PHY_ADDRESS 0x0000
+define BOARD_PHY_FIXED_LINK
+define LINK_100_FULLDUPLEX
 define HAL_PERIPH_ENABLE_NETWORKING
 
 #PWM outputs