Elektronik i Norden just published a technical insight article about the SMP kernels of Enea OSE and Linux, by Patrik Strömblad and Jonas Svennebring.
It has a nice discussion about AMP and SMP, and OS scheduling policies. It is particularly interesting to see how OSE tries to combine the two. Unfortunately, the article is in Swedish, but I would expect the CMP network that Elektronik i Norden is part of will place this article in English into EETimes or some other publication of theirs.
The article discusses some Freescale targets, such as my favorite the MPC8641D, the MPC8572E dual-core, and the upcoming QorIQ P4080.