[B.A.T.M.A.N.] something about 0.3

I've downloaded and installed the 0.3 current for fonera-kamikaze platform and it seems work fine in a robin mesh cloud... but I've a problem which I don't well undestand. When batmand starts it ask me for a /dev/batman (a modul kernel) which would improve performance. I never read before about /dev/batman, so, anyone can suggest where I can find more documentation? I believe that the originator messages compatibility number was been incremented in o.3 because a node running 0.2 doesn't see OGMs coming from batman o.3 nodes... is this correct? Thanks

-- Antonio