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TDA4VM: About RTC on TDA4VM.

Part Number: TDA4VM

Hi , experts.

I use Linux & RTOS mode on TDA4VM at following environment.

SDK:

ti-processor-sdk-rtos-j721e-evm-08_00_00_12
ti-processor-sdk-linux-j7-evm-08_00_00_08

I want to use RTC on TDA4VM.

From following ,
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/959163/faq-ccs-tda4vm-j721e-j7200-how-to-enable-rtc-on-jacinto-tda4x-evm

Q1.Method to enable RTC on SDK8 is same as above?

And I attached picture of bottom of the SDK board.
Red circle is RTC chip.
I think Blue circle is backup battery but it is not equiped.

Q2.To use the RTC , shall I need to equip the battery?