update

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@656 42af7a65-404d-4744-a932-0658087f49c3

TODO

@@ -21,7 +21,7 @@ NuttX TODO List (Last updated January 6, 2008)
   (2)  ARM/LPC214x (arch/arm/src/lpc214x/)
   (4)  pjrc-8052 / MCS51 (arch/pjrc-8051/)
   (2)  z80 (arch/z80/)
-  (6)  z16 (arch/z16/)
+  (7)  z16 (arch/z16/)
 
 o Task/Scheduler (sched/)
   ^^^^^^^^^^^^^^^^^^^^^^^
@@ -423,3 +423,9 @@ o z16 (arch/z16)
   Status:      Open
   Priority:    Medium
 
+  Description: Add support to maintain SPOV in context switching.  This
+               improvement will provide protection against stack overflow
+               and make a safer system solution.
+  Status:      Open
+  Priority:    Low
+