meta-efikamx layer on top of openembedded-core has been created and currently its added to angstrom distribution. To use it

git clone git://git.angstrom-distribution.org/setup-scripts angstrom
cd angstrom
git checkout -b oe-core origin/oe-core

./oebb.sh config efikamx

bitbake console-image

There you go !

It will generate image kernel and bootloader for efikamx

For more documentation on setting up angstrom

http://www.angstrom-distribution.org/building-angstrom