I just uploaded a white paper about EmbeddedXEN on our sourceforge website. You can download it here:
Please note that I've upgraded EmbeddedXEN project to the new host system at Sourceforge as they suggested.
It means that you need to update your URL for git:
Old repository url: git://embeddedxen.git.sourceforge.net/gitroot/embeddedxen/embeddedxen
New repository checkout command: git clone ssh://firstname.lastname@example.org/p/embeddedxen/code embeddedxen-code
Sorry about disagreements and thank you.