Did you mean this one? http://community.onion.io/topic/2830/building-kernel-modules-for-the-omega2
How does the kernel differ from just a fresh kernel from kernel.org? Devicetree settings etc.
What I'm looking for is , grab kernelsource from kernel.org select correct devicetree and arch,
compile with cross compiler (mipsel-linux-musl) and create some sort of image to be programmed to the union