HardFault when I change sram access' configuration to MPU_ACCESS_BUFFERABLE instead ofMPU_ACCESS_NOT_BUFFERABLE.

[tercelcn]

SBSFU work fine on my STM32F767ZI-Nucleo using SBSFU's default MPU configuration. but when I change  sram access to MPU_ACCESS_BUFFERABLE, HardFault occured. How to configure SRAM1 as WBWA?