Help needed enabling RTC battery backup on BeagleBoard XM

I have installed the battery on several BeagbleBoard XMs as per instructions in the SRM to allow the RTC to keep time across power cycles but I need to enable use of the battery via a software configuration of the TPS65950.

I see that the TPS65950 is connected via a SPI, but I need help with how to command the configuration of the TPS65950 for battery use & charging from an Angstrom environment.

Thanks in advance.