OMAP-L138: When do I have to set PBBPR register?

Part Number:OMAP-L138

Hi Champs,

AISgen tool dose not include the PBBPR register setting and I have to set it in my application.
So, can I set it at any time even though the application is running?
I'd like to make sure of it because I am worried about the impact of not doing it in the DDR/mDDR initialization sequence described in TRM SPRUH77C.

Regards,
j-breeze