> How would one go about creating an ETFS-based efs image in Momentics? When 
> creating a new efs, Momentics only gives you the option to create an ffs3 or 
> ffs2 filesystem (Properties -> Filesystem Type).

Unfortunately, the Momentics system builder does not support the ETFS filesystem at this time. However, we do have the 
mketfs command line utility you can use.

> Am I correct in thinking that ffs3 is only for NOR devices while ETFS is for 
> NAND devices?

You are correct.

Cheers,
Joel