diff --git a/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.h b/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.h
index 27eb8c00243f..eca1ebee36ff 100644
--- a/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.h
+++ b/ports/stm32/boards/ARDUINO_PORTENTA_H7/mpconfigboard.h
@@ -325,6 +325,8 @@ extern struct _spi_bdev_t spi_bdev;
 #define MICROPY_HW_ETH_RMII_TXD0    (pin_G13)
 #define MICROPY_HW_ETH_RMII_TXD1    (pin_G12)
 
+#define MICROPY_HW_ETH_DMA_ATTR_SECTION         __attribute__((section(".dma_buffer")))
+
 #define MICROPY_HW_USB_VID                      0x2341
 #define MICROPY_HW_USB_PID                      0x045B
 #define MICROPY_HW_USB_PID_CDC_MSC              (MICROPY_HW_USB_PID)
diff --git a/ports/stm32/eth.c b/ports/stm32/eth.c
index fd46bde23cb3..43b0b3ad174b 100644
--- a/ports/stm32/eth.c
+++ b/ports/stm32/eth.c
@@ -121,7 +121,11 @@ typedef struct _eth_t {
     int16_t (*phy_get_link_status)(uint32_t phy_addr);
 } eth_t;
 
+#ifdef MICROPY_HW_ETH_DMA_ATTR_SECTION
+static eth_dma_t eth_dma __attribute__((aligned(16384))) MICROPY_HW_ETH_DMA_ATTR_SECTION;
+#else
 static eth_dma_t eth_dma __attribute__((aligned(16384)));
+#endif
 
 eth_t eth_instance;