I'm not sure what happened to my previous post (got lost in the TI Forum "Upgrade"), but somebody out there in the community wanted my sample code to read the S2 switch and write the User LEDs from the ARM side.   This post is to let everyone know that I've put a file in my profile called i2c_app.tar.gz.  This file contains that sample application.  If you have questions, just post them back to the forum.