Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f4/STM32F412/FSMC/PATT4#0x0
Attribute memory space timing register 4
ATTSETx
ATTWAITx
ATTHOLDx
ATTHIZx
https://github.com/modm-io/cmsis-svd-stm32