i am developing custom board using STM32MP157FAC1.Please review the schematic of the  custom board and verify the connections. 

CURRENTLY I AM WORKNG ON STM32F407 DISC1. NOW I WANT TO DEVELOP CUSTOM BOARD USING .COULD YOU PLEASE REVIEW THIS SCHEMATIC CONNECTIONS. 

 I AM USING STM32F407G-DISC1 BOARD FOR DEVELOPING CUSTOM BOARD.HERE AN OSCILLATOR IS CONNECTED TO PH1 AND PH2 PINS. IS IT IS COMPALSORY FOR DEVELOPING CUSTOM BOARD?

Could someone help identify the part number and range for the SB1 component on the STM32F407G-DISC1 board? I'm interested in understanding its exact specifications.

I'm designing a custom PCB using the STM32F407G-DISC1 board as a reference, with the goal of meeting EMI/EMC standards. However, my design includes a VBAT connection from external battery that the reference board doesn't have. Can you advise on best ...