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How to add CPU_MODEL

Hello, all.

I've spent a lot of time reading the docs and must admit that still not 

I am using MPC8247 which is the "sub-model" of MPC8272 which is in 
turn "sub-model" of MPC8260. 

First of all, RTEMS tree does not recognize the MPC82xx family, but has only 
MPC8260. I saw very few references to mpc8242, but too few to understand how 
it works.

But there are some differences between all these models which I do not know 
how to treat locally in BSP files. For example, the MPC8260 has 16KB+4KB 
dpram, while MPC8272 has 8KB+4KB. Or MPC8247 does not have SCC2, while 
MPC8260 does have. And so on.

Where can I find some help to read about adding the CPU model without loosing 
most of the "main" processor (MPC8260 in my case) features?

Thanks ahead.