Question about the task scheduler on PowerPC platform.

[Qq]

Hello, all

I am a newbie to RTEMS, could you please be so kind and help with my questions 

about the 'Timer/Decrementer Registers'?

From the RTEMS porting guide :

A minimal Board Support Package includes device drivers for a clock tick, console I/O, and a benchmark timer (optional) as well as startup and miscellaneous support code. 

Since the PowerPC architecture has 'Timer/Decrementer Registers', is it possible for these registers to be used 

as a clock tick?

Thank you very much!

Kind regards