From e2a62ac8145e116f814dbc924370e359499ef318 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Mon, 20 Jul 2015 07:05:35 -0600
Subject: [PATCH] STM32 F7 Ethernet: RX/TX descriptors should be flushed to
 memory when they are first initialized

---
 arch/arm/src/stm32f7/stm32_ethernet.c | 14 +++++++++++++-
 configs                               |  2 +-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/arm/src/stm32f7/stm32_ethernet.c b/arch/arm/src/stm32f7/stm32_ethernet.c
index e19d1d8b92..aae5edcd24 100644
--- a/arch/arm/src/stm32f7/stm32_ethernet.c
+++ b/arch/arm/src/stm32f7/stm32_ethernet.c
@@ -2984,7 +2984,13 @@ static void stm32_txdescinit(struct stm32_ethmac_s *priv,
         }
     }
 
-  /* Set Transmit Desciptor List Address Register */
+  /* Flush all of the initialized TX descriptors to physical memory */
+
+  arch_clean_dcache((uintptr_t)txtable,
+                    (uintptr_t)txtable +
+                      TXTABLE_SIZE * sizeof(union stm32_txdesc_u));
+
+  /* Set Transmit Descriptor List Address Register */
 
   stm32_putreg((uint32_t)&txtable[0].txdesc, STM32_ETH_DMATDLAR);
 }
@@ -3068,6 +3074,12 @@ static void stm32_rxdescinit(struct stm32_ethmac_s *priv,
         }
     }
 
+  /* Flush all of the initialized RX descriptors to physical memory */
+
+  arch_clean_dcache((uintptr_t)rxtable,
+                    (uintptr_t)rxtable +
+                      RXTABLE_SIZE * sizeof(union stm32_rxdesc_u));
+
   /* Set Receive Descriptor List Address Register */
 
   stm32_putreg((uint32_t)&rxtable[0].rxdesc, STM32_ETH_DMARDLAR);
diff --git a/configs b/configs
index d8f3b1da89..78716e8dba 160000
--- a/configs
+++ b/configs
@@ -1 +1 @@
-Subproject commit d8f3b1da89695fc704fc1e2e405c2879210becc5
+Subproject commit 78716e8dbacee7ffe65016ab5511c248835341c8