stm32/boards/NUCLEO_F429ZI: Enable lwIP and Ethernet peripheral.

ports/stm32/boards/NUCLEO_F429ZI/mpconfigboard.h

 #define MICROPY_HW_BOARD_NAME       "NUCLEO-F429ZI"
 #define MICROPY_HW_MCU_NAME         "STM32F429"
 
+#define MICROPY_PY_LWIP             (1)
+
 #define MICROPY_HW_HAS_SWITCH       (1)
 #define MICROPY_HW_HAS_FLASH        (1)
 #define MICROPY_HW_ENABLE_RNG       (1)
@@ -81,3 +83,14 @@
 #define MICROPY_HW_USB_FS              (1)
 #define MICROPY_HW_USB_VBUS_DETECT_PIN (pin_A9)
 #define MICROPY_HW_USB_OTG_ID_PIN      (pin_A10)
+
+// Ethernet via RMII
+#define MICROPY_HW_ETH_MDC          (pin_C1)
+#define MICROPY_HW_ETH_MDIO         (pin_A2)
+#define MICROPY_HW_ETH_RMII_REF_CLK (pin_A1)
+#define MICROPY_HW_ETH_RMII_CRS_DV  (pin_A7)
+#define MICROPY_HW_ETH_RMII_RXD0    (pin_C4)
+#define MICROPY_HW_ETH_RMII_RXD1    (pin_C5)
+#define MICROPY_HW_ETH_RMII_TX_EN   (pin_G11)
+#define MICROPY_HW_ETH_RMII_TXD0    (pin_G13)
+#define MICROPY_HW_ETH_RMII_TXD1    (pin_B13)

ports/stm32/boards/NUCLEO_F429ZI/pins.csv

@@ -115,3 +115,12 @@ PG2,PG2
 SW,PA0
 LED_GREEN,PG13
 LED_RED,PG14
+ETH_MDC,PC1
+ETH_MDIO,PA2
+ETH_RMII_REF_CLK,PA1
+ETH_RMII_CRS_DV,PA7
+ETH_RMII_RXD0,PC4
+ETH_RMII_RXD1,PC5
+ETH_RMII_TX_EN,PG11
+ETH_RMII_TXD0,PG13
+ETH_RMII_TXD1,PB13