Recently openemembedded-core has been announced on which yocto is based too. I have created a meta-efikamx layer on top of openembedded. The layer is here

git://github.com/kraj/meta-efikamx.git

I have got efikaMX smarttop working with angstrom distribution using openmebedded-core.

I have proposed this layer to be included in angstrom distribution.

I will post once its accepted in angstrom.