Codes about embedded SELinux
Many codes are submitted to Linux and userland community.
Xattr support for jffs2
Reducing read/write overhead
Reducing memory usage:
Improving performance in AVC miss:
Audit support for SH:
Reducing size of library: Merged to libselinux 2.0.35: 
Applets related to SELinux are merged to BusyBox in 1.8.0.
Support to assign domain to applets is merged to 1.8.0: 
SELinux Policy Editor will be helpful. See .
If you prefer fine grained configuration, Reference policy is better.
Example of porting to SH(Super H) was reported in CELF Jambolee #18: .
Xattr port to jffs2(Japanese)
logfs, yaffs, cramfs do not support xattr yet.