diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index f1688c4b9..d331601ac 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -3254,3 +3254,5 @@
 	  a second, lower priority work queue (CONFIG_SCHED_LPWORK).
 	* arch/arm/src/stm32/stm32_dma.c, chip/stm32*_memorymap.h:  FSMC SRAM is
 	  only 16-bits wide and the SDIO DMA must be set up differently.
+	* arch/arm/src/stm32/stm32_dma.c:  Back out the 16-bit DMA change. It
+	  is incorrect.
diff --git a/nuttx/arch/arm/src/stm32/stm32_sdio.c b/nuttx/arch/arm/src/stm32/stm32_sdio.c
index 236d166df..a8bcae307 100644
--- a/nuttx/arch/arm/src/stm32/stm32_sdio.c
+++ b/nuttx/arch/arm/src/stm32/stm32_sdio.c
@@ -185,12 +185,8 @@
 #if defined(CONFIG_STM32_STM32F10XX)
 #  define SDIO_RXDMA32_CONFIG    (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_32BITS|\
                                   DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC)
-#  define SDIO_RXDMA16_CONFIG    (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_16BITS|\
-                                  DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC)
 #  define SDIO_TXDMA32_CONFIG    (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_32BITS|\
                                   DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC|DMA_CCR_DIR)
-#  define SDIO_TXDMA16_CONFIG    (CONFIG_SDIO_DMAPRIO|DMA_CCR_MSIZE_16BITS|\
-                                  DMA_CCR_PSIZE_32BITS|DMA_CCR_MINC|DMA_CCR_DIR)
 
 /* STM32 F4 stream configuration register (SCR) settings. */
 
@@ -199,18 +195,10 @@
                                   DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_32BITS|\
                                   CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\
                                   DMA_SCR_MBURST_INCR4)
-#  define SDIO_RXDMA16_CONFIG    (DMA_SCR_PFCTRL|DMA_SCR_DIR_P2M|DMA_SCR_MINC|\
-                                  DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_16BITS|\
-                                  CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\
-                                  DMA_SCR_MBURST_INCR4)
 #  define SDIO_TXDMA32_CONFIG    (DMA_SCR_PFCTRL|DMA_SCR_DIR_M2P|DMA_SCR_MINC|\
                                   DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_32BITS|\
                                   CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\
                                   DMA_SCR_MBURST_INCR4)
-#  define SDIO_TXDMA16_CONFIG    (DMA_SCR_PFCTRL|DMA_SCR_DIR_M2P|DMA_SCR_MINC|\
-                                  DMA_SCR_PSIZE_32BITS|DMA_SCR_MSIZE_16BITS|\
-                                  CONFIG_SDIO_DMAPRIO|DMA_SCR_PBURST_INCR4|\
-                                  DMA_SCR_MBURST_INCR4)
 #else
 #  error "Unknown STM32 DMA"
 #endif
@@ -2514,22 +2502,8 @@ static int stm32_dmarecvsetup(FAR struct sdio_dev_s *dev, FAR uint8_t *buffer,
       stm32_configxfrints(priv, SDIO_DMARECV_MASK);
 
       putreg32(1, SDIO_DCTRL_DMAEN_BB);
-
-      /* On-chip SRAM is 32-bits wide.  FSMC SRAM is 16-bits wide */
-
-#ifdef CONFIG_STM32_FSMC
-      if (STM32_IS_EXTSRAM(buffer))
-        {
-          stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer,
-                         (buflen + 1) >> 1, SDIO_RXDMA16_CONFIG);
-        }
-      else
-#endif
-        {
-          DEBUGASSERT(STM32_IS_SRAM(buffer));
-          stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer,
-                         (buflen + 3) >> 2, SDIO_RXDMA32_CONFIG);
-        }
+      stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer,
+                     (buflen + 3) >> 2, SDIO_RXDMA32_CONFIG);
  
       /* Start the DMA */
 
@@ -2597,21 +2571,8 @@ static int stm32_dmasendsetup(FAR struct sdio_dev_s *dev,
 
       /* Configure the TX DMA */
 
-      /* On-chip SRAM is 32-bits wide.  FSMC SRAM is 16-bits wide */
-
-#ifdef CONFIG_STM32_FSMC
-      if (STM32_IS_EXTSRAM(buffer))
-        {
-          stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer,
-                         (buflen + 1) >> 1, SDIO_TXDMA16_CONFIG);
-        }
-      else
-#endif
-        {
-          DEBUGASSERT(STM32_IS_SRAM(buffer));
-          stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer,
-                         (buflen + 3) >> 2, SDIO_TXDMA32_CONFIG);
-        }
+      stm32_dmasetup(priv->dma, STM32_SDIO_FIFO, (uint32_t)buffer,
+                     (buflen + 3) >> 2, SDIO_TXDMA32_CONFIG);
 
       stm32_sample(priv, SAMPLENDX_BEFORE_ENABLE);
       putreg32(1, SDIO_DCTRL_DMAEN_BB);