Patch serial stack.


git-svn-id: https://tinyos-main.googlecode.com/svn/trunk@6031 285f258d-8064-b571-fbc6-9656dc998e90
Last commit for serial patch that resolves Google Code issue 152.


git-svn-id: https://tinyos-main.googlecode.com/svn/trunk@6032 285f258d-8064-b571-fbc6-9656dc998e90
MDA300 support from Franco Di Persio.


git-svn-id: https://tinyos-main.googlecode.com/svn/trunk@6033 285f258d-8064-b571-fbc6-9656dc998e90