Security Model on YFFS2 / SELinux on YFFS2



Looking for a security module for TI OMAP 3530 processor + embedded Linux based system. The filesystem of my board is YFFS2.
My team decided for SELinux (after doing 2 months RnD) but the problem is xattr is not supported on YFFS2.

We am coverging for following solution:
1. use grsecurity as security model.
2. Port xattr on YFFS2 : But no-one seems to be working on xattr porting to YFFS2.Can any-one please guide me where I look for information on xattr porting on YFFS2.

Can some please guide me regarding appropriate security model on YFFS2.