From c96fbebd55038ba80ec1ee167eeedf0b0e3ed264 Mon Sep 17 00:00:00 2001
From: Martino Facchin <m.facchin@arduino.cc>
Date: Wed, 28 Oct 2020 14:57:38 +0100
Subject: [PATCH] STM32: EMAC: allow compiling on MCUs without DCACHE

---
 connectivity/drivers/emac/TARGET_STM/stm32xx_emac.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/connectivity/drivers/emac/TARGET_STM/stm32xx_emac.cpp b/connectivity/drivers/emac/TARGET_STM/stm32xx_emac.cpp
index 9068ac697e..356576dd21 100644
--- a/connectivity/drivers/emac/TARGET_STM/stm32xx_emac.cpp
+++ b/connectivity/drivers/emac/TARGET_STM/stm32xx_emac.cpp
@@ -654,8 +654,10 @@ int STM32_EMAC::low_level_input(emac_mem_buf_t **buf)
         /* Build Rx descriptor to be ready for next data reception */
         HAL_ETH_BuildRxDescriptors(&EthHandle);
 
+#if !(defined(DUAL_CORE) && defined(CORE_CM4))
         /* Invalidate data cache for ETH Rx Buffers */
         SCB_InvalidateDCache_by_Addr((uint32_t *)RxBuff.buffer, frameLength);
+#endif
 
         *buf = pbuf_alloc(PBUF_RAW, frameLength, PBUF_POOL);
         if (*buf) {