Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H745_CM4/SYSCFG/CFGR#0x0
configuration register
CM4L
PVDL
FLASHL
CM7L
BKRAML
SRAM4L
SRAM3L
SRAM2L
SRAM1L
DTCML
ITCML
AXISRAML
https://github.com/modm-io/cmsis-svd-stm32