Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32U599/SYSCFG/CFGR2#0x0
configuration register 2
LOCKUP (hardfault) output enable bit
SRAM ECC lock bit
PVD lock enable bit
ECC Lock
https://github.com/cmsis-svd/cmsis-svd-data