For a CPU called xyz, create a <ppcv_chip_xyz.c> and in it put an appropriately initialized struct ppcv_chip ppcv_chip_xyz variable. Add the ppcv_chip_xyz variable to the default ppcv_list (in <ppcv_list.c>).
If you were able to use an already existing ppcv_setup_*() function for the ppcv_chip_xyz initialization, you're done. Otherwise, create a <ppcv_setup_xyz.c> file with the properly coded ppcv_setup_xyz() function in it (don't forget to add the prototype to <cpu_startup.h>).
If you were able to use already existing ppcv_* routines in the ppcv_setup_xyz() function, you're done. Otherwise, create the routines in the appropriate <ppcv_*_xyz.c> files (don't forget to add the prototype(s) to <cpu_startup.h>). When possible, code the routines in an object-oriented manner, calling already existing routines to fill more generic information, e.g. ppcv_cpuconfig2_700() uses ppcv_cpuconfig2_600() to do most of the work and then it just fills in the 700 series-specific info.
With the new design, the following routines are now deprecated (and they spit out a message to that effect if you call them):