There is an active community developing support for Freescale boards at:
https://github.com/Freescale/meta-fsl-arm
The idea is to merge https://www.gitorious.org/schnitzeltony-oe-meta/meta-freescale into this new project.
In terms of documentation, there is nothing specific to this layer, but you can join the maling list for help.
Here is the README file of the project:
OpenEmbedded/Yocto BSP layer for Freescale's ARM platforms
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This layer provides support for Freescale's ARM platforms for use with OpenEmbedded and/or Yocto.
This layer depends on:
URI: git://git.openembedded.org/openembedded-core
branch: master revision: HEAD
Contributing
------------
To contribute to this layer you should the patches for review to the mailing list.
Mailing list: http://groups.google.com/group/meta-fsl-arm
Source code: https://github.com/Freescale/meta-fsl-arm