diff --git a/configs/README.txt b/configs/README.txt
index 5443eb75e3f..36c422f466e 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -287,7 +287,6 @@ defconfig -- This is a configuration file similar to the Linux
 		  Read/Write
 		CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 		  Default is 20MHz.
-		CONFIG_MMCSD_SYNCHRONIZE - Special synchronization logic needed
 
 	TCP/IP and UDP support via uIP
 		CONFIG_NET - Enable or disable all network features
diff --git a/configs/eagle100/httpd/defconfig b/configs/eagle100/httpd/defconfig
index 9c42f6583de..8f410917db2 100644
--- a/configs/eagle100/httpd/defconfig
+++ b/configs/eagle100/httpd/defconfig
@@ -359,13 +359,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 CONFIG_MMCSD_SPICLOCK=12500000
-CONFIG_MMCSD_SYNCHRONIZE=n
 
 #
 # TCP/IP and UDP support via uIP
diff --git a/configs/eagle100/nettest/defconfig b/configs/eagle100/nettest/defconfig
index 8b501a9d141..96d82f693d9 100644
--- a/configs/eagle100/nettest/defconfig
+++ b/configs/eagle100/nettest/defconfig
@@ -359,13 +359,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 CONFIG_MMCSD_SPICLOCK=12500000
-CONFIG_MMCSD_SYNCHRONIZE=n
 
 #
 # TCP/IP and UDP support via uIP
diff --git a/configs/eagle100/nsh/defconfig b/configs/eagle100/nsh/defconfig
index 6bd803948b9..cbd62632f19 100644
--- a/configs/eagle100/nsh/defconfig
+++ b/configs/eagle100/nsh/defconfig
@@ -358,13 +358,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 CONFIG_MMCSD_SPICLOCK=12500000
-CONFIG_MMCSD_SYNCHRONIZE=n
 
 #
 # TCP/IP and UDP support via uIP
diff --git a/configs/eagle100/ostest/defconfig b/configs/eagle100/ostest/defconfig
index 2abbbb648f3..0667030544a 100644
--- a/configs/eagle100/ostest/defconfig
+++ b/configs/eagle100/ostest/defconfig
@@ -358,13 +358,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 CONFIG_MMCSD_SPICLOCK=12500000
-CONFIG_MMCSD_SYNCHRONIZE=n
 
 #
 # TCP/IP and UDP support via uIP
diff --git a/configs/mcu123-lpc214x/nsh/defconfig b/configs/mcu123-lpc214x/nsh/defconfig
index fd55a8f22bc..c84aad6df56 100644
--- a/configs/mcu123-lpc214x/nsh/defconfig
+++ b/configs/mcu123-lpc214x/nsh/defconfig
@@ -309,13 +309,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 #CONFIG_MMCSD_SPICLOCK=20000000
-CONFIG_MMCSD_SYNCHRONIZE=y
 
 #
 # SPI-based MMC/SD driver
diff --git a/configs/mcu123-lpc214x/ostest/defconfig b/configs/mcu123-lpc214x/ostest/defconfig
index 28dac142bfe..ad5da5d30d3 100644
--- a/configs/mcu123-lpc214x/ostest/defconfig
+++ b/configs/mcu123-lpc214x/ostest/defconfig
@@ -305,13 +305,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 #CONFIG_MMCSD_SPICLOCK=20000000
-CONFIG_MMCSD_SYNCHRONIZE=y
 
 #
 # TCP/IP and UDP support via uIP
diff --git a/configs/mcu123-lpc214x/usbserial/defconfig b/configs/mcu123-lpc214x/usbserial/defconfig
index 445cbac4efb..0d95664cb4c 100644
--- a/configs/mcu123-lpc214x/usbserial/defconfig
+++ b/configs/mcu123-lpc214x/usbserial/defconfig
@@ -310,13 +310,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 #CONFIG_MMCSD_SPICLOCK=20000000
-CONFIG_MMCSD_SYNCHRONIZE=y
 
 #
 # TCP/IP and UDP support via uIP
diff --git a/configs/mcu123-lpc214x/usbstorage/defconfig b/configs/mcu123-lpc214x/usbstorage/defconfig
index da601a98ff6..3cf08afc234 100644
--- a/configs/mcu123-lpc214x/usbstorage/defconfig
+++ b/configs/mcu123-lpc214x/usbstorage/defconfig
@@ -310,13 +310,10 @@ CONFIG_FS_ROMFS=n
 #   Provide read-only access (default is read/write)
 # CONFIG_MMCSD_SPICLOCK - Maximum SPI clock to drive MMC/SD card.
 #   Default is 20MHz.
-# CONFIG_MMCSD_SYNCHRONIZE
-#   Special synchronization logic needed
 #
 CONFIG_MMCSD_NSLOTS=1
 CONFIG_MMCSD_READONLY=n
 #CONFIG_MMCSD_SPICLOCK=20000000
-CONFIG_MMCSD_SYNCHRONIZE=y
 
 #
 # TCP/IP and UDP support via uIP