The board I'm developing is an one based on iMX283. The main power supply is +5V without Li-ion battery. But the RTC is required. Is it possible to connect a button-battery(normally 3V only) to support RTC inside of iMX28? What I can do is:
(1) pin BATT -> 3V battery which is NOT chargeable;
(2) pin DCDC_BATT -> NC
(3) call PowerStopCharger( ) in xldr.c
(4) BattDrv.all is NOT installed
I'm not sure if 3V is enough to support RTC working. Please let me know if anybody has some experiece about this issue. Thanks advance!