(1) Fix a critical memory leak in the TCP read-ahead buffering logic; Add an option to suppress SDIO multi-block transfers in order to work around a buggy SDIO driver

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4415 7fd9a85b-ad96-42d3-883c-3090e2eb8679

nuttx/Documentation/NuttxPortingGuide.html

@@ -12,7 +12,7 @@
       <h1><big><font color="#3c34ec">
         <i>NuttX RTOS Porting Guide</i>
       </font></big></h1>
-      <p>Last Updated: February 5, 2011</p>
+      <p>Last Updated: February 22, 2011</p>
     </td>
   </tr>
 </table>
@@ -4474,6 +4474,11 @@ build
     <code>CONFIG_SDIO_WIDTH_D1_ONLY</code>: Select 1-bit transfer mode.  Default:
     4-bit transfer mode.
   </li>
+  <li>
+    <code>CONFIG_MMCSD_MULTIBLOCK_DISABLE</code>: Use only the single block transfer method.
+    This setting is used to work around buggy SDIO drivers that cannot handle
+    multiple block transfers.
+  </li>
 </ul>
 
 <h3>SDIO-based MMC/SD driver</h3>