diff --git a/README.txt b/README.txt
index 8a69e3e3308..83b04f5a2a7 100755
--- a/README.txt
+++ b/README.txt
@@ -1,10 +1,25 @@
 README
 ^^^^^^
 
+  o Installation
   o Configuring NuttX
   o Building NuttX
   o Documentation
 
+INSTALLATION
+^^^^^^^^^^^^
+
+Download and unpack the NuttX tarball.  If you are reading this, then you
+have probably already done that.  After unpacking, you will end up with a
+directory called nuttx-version (where version is the NuttX version number).
+You might want to rename that directory nuttx to match the various instructions
+in the documentation and some scripts in the source tree.
+
+That nuttx build directory should reside in a path that contains no spaces
+in the higher level directory names.  For example, under Cygwin, your home
+directory might be formed from your first and last names like: "/home/First Last".
+That will cause strange errors when the make system tries to build.
+
 CONFIGURING NUTTX
 ^^^^^^^^^^^^^^^^^
 
diff --git a/configs/stm3210e-eval/nsh/defconfig b/configs/stm3210e-eval/nsh/defconfig
index bcf5723887f..97e81e3d5ef 100755
--- a/configs/stm3210e-eval/nsh/defconfig
+++ b/configs/stm3210e-eval/nsh/defconfig
@@ -499,7 +499,7 @@ CONFIG_FS_WRITEBUFFER=n
 # CONFIG_MMCSD_HAVECARDDETECT
 #   SDIO driver card detection is 100% accurate
 #
-CONFIG_SDIO_DMA=n
+CONFIG_SDIO_DMA=y
 CONFIG_MMCSD_MMCSUPPORT=n
 CONFIG_MMCSD_HAVECARDDETECT=n