BPI-F2S: How to use the SP7021 chip for lowest power consumption?

Hello!

Can someone tell me if it is possible to use ONLY the 8051 core of the SP7021 chip (for lowest power consumption)? The 8051 core will also turn on (activate) the other cores and start the operating system when receiving an interrupt (e.g., from UART or RTC). If so, please explain how.

Thank you, Cristian M.