diff --git a/connectivity/drivers/emac/TARGET_STM/TARGET_STM32H7/TARGET_PORTENTA_H7/stm32h7_eth_init.c b/connectivity/drivers/emac/TARGET_STM/TARGET_STM32H7/TARGET_PORTENTA_H7/stm32h7_eth_init.c
new file mode 100644
index 0000000000..53de30a37f
--- /dev/null
+++ b/connectivity/drivers/emac/TARGET_STM/TARGET_STM32H7/TARGET_PORTENTA_H7/stm32h7_eth_init.c
@@ -0,0 +1,171 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define ETHERNET 1
+
+#ifndef USE_USER_DEFINED_HAL_ETH_MSPINIT
+
+#include "stm32h7xx_hal.h"
+
+#define ETH_TX_EN_Pin GPIO_PIN_11
+#define ETH_TX_EN_GPIO_Port GPIOG
+#define ETH_TXD1_Pin GPIO_PIN_12
+#define ETH_TXD1_GPIO_Port GPIOG
+#define ETH_TXD0_Pin GPIO_PIN_13
+#define ETH_TXD0_GPIO_Port GPIOG
+#define ETH_MDC_SAI4_D1_Pin GPIO_PIN_1
+#define ETH_MDC_SAI4_D1_GPIO_Port GPIOC
+#define ETH_MDIO_Pin GPIO_PIN_2
+#define ETH_MDIO_GPIO_Port GPIOA
+#define ETH_REF_CLK_Pin GPIO_PIN_1
+#define ETH_REF_CLK_GPIO_Port GPIOA
+#define ETH_CRS_DV_Pin GPIO_PIN_7
+#define ETH_CRS_DV_GPIO_Port GPIOA
+#define ETH_RXD0_Pin GPIO_PIN_4
+#define ETH_RXD0_GPIO_Port GPIOC
+#define ETH_RXD1_Pin GPIO_PIN_5
+#define ETH_RXD1_GPIO_Port GPIOC
+
+/**
+ * Override HAL Eth Init function
+ */
+void HAL_ETH_MspInit(ETH_HandleTypeDef *heth)
+{
+    GPIO_InitTypeDef GPIO_InitStruct;
+    if(heth->Instance == ETH)
+    {
+        #if !(defined(DUAL_CORE) && defined(CORE_CM4))
+        /* Disable DCache for STM32H7 family */
+        SCB_DisableDCache();
+        #endif
+
+        /* GPIO Ports Clock Enable */
+        __HAL_RCC_GPIOA_CLK_ENABLE();
+        // __HAL_RCC_GPIOB_CLK_ENABLE();
+        __HAL_RCC_GPIOC_CLK_ENABLE();
+        __HAL_RCC_GPIOG_CLK_ENABLE();
+        // __HAL_RCC_GPIOH_CLK_ENABLE();
+
+        /* Enable Peripheral clock */
+        __HAL_RCC_ETH1MAC_CLK_ENABLE();
+        __HAL_RCC_ETH1TX_CLK_ENABLE();
+        __HAL_RCC_ETH1RX_CLK_ENABLE();
+
+        /* Set pinstrap for 100mbit */
+        // TODO
+
+        /* Reset ETH Phy */
+        __HAL_RCC_GPIOJ_CLK_ENABLE();
+        GPIO_InitTypeDef  gpio_eth_rst_init_structure;
+        gpio_eth_rst_init_structure.Pin = GPIO_PIN_15;
+        gpio_eth_rst_init_structure.Mode = GPIO_MODE_OUTPUT_PP;
+        gpio_eth_rst_init_structure.Pull = GPIO_NOPULL;
+        gpio_eth_rst_init_structure.Speed = GPIO_SPEED_FREQ_LOW;
+        HAL_GPIO_Init(GPIOJ, &gpio_eth_rst_init_structure);
+
+        gpio_eth_rst_init_structure.Pin = ETH_RXD0_Pin | ETH_RXD1_Pin;
+        HAL_GPIO_Init(GPIOC, &gpio_eth_rst_init_structure);
+        HAL_GPIO_WritePin(GPIOC, ETH_RXD0_Pin, 1);
+        HAL_GPIO_WritePin(GPIOC, ETH_RXD1_Pin, 1);
+        gpio_eth_rst_init_structure.Pin = ETH_CRS_DV_Pin;
+        HAL_GPIO_Init(GPIOA, &gpio_eth_rst_init_structure);
+        HAL_GPIO_WritePin(GPIOA, ETH_CRS_DV_Pin, 1);
+
+        HAL_Delay(25);
+        HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_15, 0);
+        HAL_Delay(100);
+        HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_15, 1);
+
+        /**ETH GPIO Configuration
+        PG11     ------> ETH_TX_EN
+        PG12     ------> ETH_TXD1
+        PG13     ------> ETH_TXD0
+        PC1     ------> ETH_MDC
+        PA2     ------> ETH_MDIO
+        PA1     ------> ETH_REF_CLK
+        PA7     ------> ETH_CRS_DV
+        PC4     ------> ETH_RXD0
+        PC5     ------> ETH_RXD1
+        */
+        GPIO_InitStruct.Pin = ETH_TX_EN_Pin|ETH_TXD1_Pin|ETH_TXD0_Pin;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_NOPULL;
+        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
+        HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
+
+        GPIO_InitStruct.Pin = ETH_MDC_SAI4_D1_Pin|ETH_RXD0_Pin|ETH_RXD1_Pin;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_NOPULL;
+        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
+        HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+
+        GPIO_InitStruct.Pin = ETH_MDIO_Pin|ETH_REF_CLK_Pin|ETH_CRS_DV_Pin;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_NOPULL;
+        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    }
+}
+
+/**
+ * Override HAL Eth DeInit function
+ */
+void HAL_ETH_MspDeInit(ETH_HandleTypeDef *heth)
+{
+    if(heth->Instance == ETH)
+    {
+        /* Peripheral clock disable */
+        __HAL_RCC_ETH1MAC_CLK_DISABLE();
+        __HAL_RCC_ETH1TX_CLK_DISABLE();
+        __HAL_RCC_ETH1RX_CLK_DISABLE();
+
+        /**ETH GPIO Configuration
+        PG11     ------> ETH_TX_EN
+        PG12     ------> ETH_TXD1
+        PG13     ------> ETH_TXD0
+        PC1     ------> ETH_MDC
+        PA2     ------> ETH_MDIO
+        PA1     ------> ETH_REF_CLK
+        PA7     ------> ETH_CRS_DV
+        PC4     ------> ETH_RXD0
+        PC5     ------> ETH_RXD1
+        */
+        HAL_GPIO_DeInit(GPIOG, ETH_TX_EN_Pin|ETH_TXD1_Pin|ETH_TXD0_Pin);
+
+        HAL_GPIO_DeInit(GPIOC, ETH_MDC_SAI4_D1_Pin|ETH_RXD0_Pin|ETH_RXD1_Pin);
+
+        HAL_GPIO_DeInit(GPIOA, ETH_MDIO_Pin|ETH_REF_CLK_Pin|ETH_CRS_DV_Pin);
+
+        HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_15, 0);
+    }
+}
+
+#endif /* USE_USER_DEFINED_HAL_ETH_MSPINIT */
diff --git a/targets/targets.json b/targets/targets.json
index 771dfe23ca..fff13e9062 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -3024,13 +3024,15 @@
         ],
         "device_has_add": [
             "USBDEVICE",
+            "EMAC",
             "QSPI"
         ],
         "overrides": {
             "system_power_supply": "PWR_SMPS_1V8_SUPPLIES_LDO",
             "clock_source": "USE_PLL_HSE_EXTC",
             "lse_available": 1,
-            "lpticker_delay_ticks": 0
+            "lpticker_delay_ticks": 0,
+            "network-default-interface-type": "ETHERNET"
         },
         "device_name": "STM32H747XIHx"
     },