Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H723/SYSCFG/UR13#0x0
SYSCFG user register 13
Secured DTCM RAM Size
D1 Standby reset
https://github.com/modm-io/cmsis-svd-stm32