AM4372: RTC+DDR mode questions

Hi SIr

We used AM4372 for development with TPS65218 in latest SDK. 

We have checked below wiki's content 

http://processors.wiki.ti.com/index.php/Linux_Core_Power_Management_User%27s_Guide_(v4.1)#RTC-Only_and_RTC.2BDDR_Mode

There are some questions which need your help

1. for the selection of RTC-Only and RTC+DDR Mode,  does the processor SDK support RTC+DDR mode in default ? 

2. if we execute poweroff command , does it mean the system will go into RTC+DDR Mode ? 

thanks 

BR

Yimin