Vita Devkit CP

Vita devkit contains separate board with Communication Processor (CP).
CP is Renesas Emma-mobile 1 (EM1-S)

CP board runs custom linux+busybox build.
There's available source for kernel and some custom modules, however main apps and modules that deal with CP <-> Vita and CP <-> Host PC are closed-source.

Board photos courtesy of S1ngyy.
X-ray scans courtesy of S1ngyy and Jana Marie Hemsing.