diff --git a/configs/kwikstik-k40/include/board.h b/configs/kwikstik-k40/include/board.h
index 58b2cd2184..19653e74e1 100755
--- a/configs/kwikstik-k40/include/board.h
+++ b/configs/kwikstik-k40/include/board.h
@@ -109,10 +109,19 @@
 #define BOARD_SDHC_SD1MODE_PRESCALER  SDHC_SYSCTL_SDCLKFS_DIV2
 #define BOARD_SDHC_SD1MODE_DIVISOR    SDHC_SYSCTL_DVS_DIV(3)
 
-/* SD normal mode (4-bit): 24MHz  = 96MHz / (2 * 2) */
+/* SD normal mode (4-bit): 24MHz  = 96MHz / (2 * 2) (with DMA)
+ * SD normal mode (4-bit): 16MHz  = 96MHz / (2 * 3) (no DMA)
+ */
 
-#define BOARD_SDHC_SD4MODE_PRESCALER  SDHC_SYSCTL_SDCLKFS_DIV2
-#define BOARD_SDHC_SD4MODE_DIVISOR    SDHC_SYSCTL_DVS_DIV(2)
+#ifdef CONFIG_SDIO_DMA
+#  define BOARD_SDHC_SD4MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV2
+#  define BOARD_SDHC_SD4MODE_DIVISOR   SDHC_SYSCTL_DVS_DIV(2)
+#else
+//#  define BOARD_SDHC_SD4MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV2
+//#  define BOARD_SDHC_SD4MODE_DIVISOR   SDHC_SYSCTL_DVS_DIV(3)
+#  define BOARD_SDHC_SD4MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV16
+#  define BOARD_SDHC_SD4MODE_DIVISOR   SDHC_SYSCTL_DVS_DIV(15)
+#endif
 
 /* LED definitions ******************************************************************/
 /* The KwikStik-K40 board has no MCU driven, GPIO-based LEDs */
diff --git a/configs/twr-k60n512/include/board.h b/configs/twr-k60n512/include/board.h
index bea58470c6..76039f7199 100755
--- a/configs/twr-k60n512/include/board.h
+++ b/configs/twr-k60n512/include/board.h
@@ -97,23 +97,32 @@
 
 /* Identification mode:  400KHz = 96MHz / ( 16 * 15) */
 
-#define BOARD_SDHC_IDMODE_PRESCALER   SDHC_SYSCTL_SDCLKFS_DIV16
-#define BOARD_SDHC_IDMODE_DIVISOR     SDHC_SYSCTL_DVS_DIV(15)
+#define BOARD_SDHC_IDMODE_PRESCALER    SDHC_SYSCTL_SDCLKFS_DIV16
+#define BOARD_SDHC_IDMODE_DIVISOR      SDHC_SYSCTL_DVS_DIV(15)
 
 /* MMC normal mode: 16MHz  = 96MHz / (2 * 3) */
 
-#define BOARD_SDHC_MMCMODE_PRESCALER  SDHC_SYSCTL_SDCLKFS_DIV2
-#define BOARD_SDHC_MMCMODE_DIVISOR    SDHC_SYSCTL_DVS_DIV(3)
+#define BOARD_SDHC_MMCMODE_PRESCALER   SDHC_SYSCTL_SDCLKFS_DIV2
+#define BOARD_SDHC_MMCMODE_DIVISOR     SDHC_SYSCTL_DVS_DIV(3)
 
 /* SD normal mode (1-bit): 16MHz  = 96MHz / (2 * 3) */
 
-#define BOARD_SDHC_SD1MODE_PRESCALER  SDHC_SYSCTL_SDCLKFS_DIV2
-#define BOARD_SDHC_SD1MODE_DIVISOR    SDHC_SYSCTL_DVS_DIV(3)
+#define BOARD_SDHC_SD1MODE_PRESCALER   SDHC_SYSCTL_SDCLKFS_DIV2
+#define BOARD_SDHC_SD1MODE_DIVISOR     SDHC_SYSCTL_DVS_DIV(3)
 
-/* SD normal mode (4-bit): 24MHz  = 96MHz / (2 * 2) */
+/* SD normal mode (4-bit): 24MHz  = 96MHz / (2 * 2) (with DMA)
+ * SD normal mode (4-bit): 16MHz  = 96MHz / (2 * 3) (no DMA)
+ */
 
-#define BOARD_SDHC_SD4MODE_PRESCALER  SDHC_SYSCTL_SDCLKFS_DIV2
-#define BOARD_SDHC_SD4MODE_DIVISOR    SDHC_SYSCTL_DVS_DIV(2)
+#ifdef CONFIG_SDIO_DMA
+#  define BOARD_SDHC_SD4MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV2
+#  define BOARD_SDHC_SD4MODE_DIVISOR   SDHC_SYSCTL_DVS_DIV(2)
+#else
+//#  define BOARD_SDHC_SD4MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV2
+//#  define BOARD_SDHC_SD4MODE_DIVISOR   SDHC_SYSCTL_DVS_DIV(3)
+#  define BOARD_SDHC_SD4MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV16
+#  define BOARD_SDHC_SD4MODE_DIVISOR   SDHC_SYSCTL_DVS_DIV(15)
+#endif
 
 /* LED definitions ******************************************************************/
 /* The TWR-K60N512 has four LEDs: