Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32l4/STM32L4x3/SYSCFG/CFGR2#0x0
CFGR2
CLL
SRAM2 parity lock bit
PVD lock enable bit
ECC Lock
SRAM2 parity error flag
https://github.com/modm-io/cmsis-svd-stm32