diff --git a/nuttx/configs/stm3220g-eval/README.txt b/nuttx/configs/stm3220g-eval/README.txt
index bc85f7ff0..665034254 100644
--- a/nuttx/configs/stm3220g-eval/README.txt
+++ b/nuttx/configs/stm3220g-eval/README.txt
@@ -888,7 +888,9 @@ Where <subdir> is one of the following:
        Since RS-232 and SDIO use the same pins (one controlled by JP22), RS232
        and SDIO cannot be used concurrently.
 
-    3. This configuration requires that jumper JP22 be set to enable SDIO operation.
+    3. This configuration requires that jumper JP22 be set to enable SDIO
+       operation.  To enable MicroSD Card, which shares same I/Os with RS-232,
+       JP22 is not fitted.
 
     4. In order to use SDIO without overruns, DMA must be used.
 
diff --git a/nuttx/configs/stm3220g-eval/include/board.h b/nuttx/configs/stm3220g-eval/include/board.h
index f4fd918f1..bd0a059f7 100644
--- a/nuttx/configs/stm3220g-eval/include/board.h
+++ b/nuttx/configs/stm3220g-eval/include/board.h
@@ -265,6 +265,7 @@
  * - PC11 is MicroSDCard_D3 & RS232/IrDA_RX (JP22 open)
  * - PC10 is MicroSDCard_D2 & RSS232/IrDA_TX
  */
+
 #ifdef CONFIG_STM32_USART3
 #  define GPIO_USART3_RX GPIO_USART3_RX_2
 #  define GPIO_USART3_TX GPIO_USART3_TX_2
@@ -422,6 +423,17 @@
 #define GPIO_I2C1_SCL       GPIO_I2C1_SCL_1
 #define GPIO_I2C1_SDA       GPIO_I2C1_SDA_2
 
+/* DMA Channl/Stream Selections *****************************************************/
+/* Stream selections are arbitrary for now but might become important in the future
+ * is we set aside more DMA channels/streams.
+ *
+ * SDIO DMA
+ *   DMAMAP_SDIO_1 = Channel 4, Stream 3
+ *   DMAMAP_SDIO_2 = Channel 4, Stream 6
+ */
+
+#define DMAMAP_SDIO DMAMAP_SDIO_1
+
 /************************************************************************************
  * Public Data
  ************************************************************************************/
diff --git a/nuttx/configs/stm3220g-eval/nsh2/defconfig b/nuttx/configs/stm3220g-eval/nsh2/defconfig
index 7f5a7fd87..6ea3f18a0 100644
--- a/nuttx/configs/stm3220g-eval/nsh2/defconfig
+++ b/nuttx/configs/stm3220g-eval/nsh2/defconfig
@@ -812,7 +812,6 @@ CONFIG_MMCSD_MULTIBLOCK_DISABLE=y
 CONFIG_MMCSD_MMCSUPPORT=n
 CONFIG_MMCSD_HAVECARDDETECT=n
 
-
 #
 # TCP/IP and UDP support via uIP
 #
diff --git a/nuttx/configs/stm3240g-eval/README.txt b/nuttx/configs/stm3240g-eval/README.txt
index bb7ff4216..6c1617f55 100755
--- a/nuttx/configs/stm3240g-eval/README.txt
+++ b/nuttx/configs/stm3240g-eval/README.txt
@@ -1006,7 +1006,8 @@ Where <subdir> is one of the following:
        CONFIG_NX=y                          : Enable graphics suppport
        CONFIG_MM_REGIONS=3                  : When FSMC is enabled, so is the on-board SRAM memory region
 
-    8. This configuration requires that jumper JP22 be set to enable RS-232 operation.
+    8. This configuration requires that jumper JP22 be set to enable RS-232
+       operation.
 
   nsh2:
   -----
@@ -1051,7 +1052,9 @@ Where <subdir> is one of the following:
        Since RS-232 and SDIO use the same pins (one controlled by JP22), RS232
        and SDIO cannot be used concurrently.
 
-    3. This configuration requires that jumper JP22 be set to enable SDIO operation.
+    3. This configuration requires that jumper JP22 be set to enable SDIO
+       operation.  To enable MicroSD Card, which shares same I/Os with RS-232,
+       JP22 is not fitted.
 
     4. In order to use SDIO without overruns, DMA must be used.  The STM32 F4
        has 192Kb of SRAM in two banks:  112Kb of "system" SRAM located at