Inversion-less Berlekamp-Massey in Matlab?

I'm trying to get a Matlab implementation of the inversionless
Berlekamp-Massey algorithm and I'm having a surprising devil of a time
getting it to work properly.  I had an implementation working for a simple
(7,3) code but it failed to work for a larger (255,239) code.  

Can anyone point me to a good matlab implementation of this?  Or at least
a reliable spec on the algorithm?