FRDM-K64F sysmpu does not take effect in some addresses

[jiameng]

Hello,

I am using sysmpu to configure the access permission of peripheral address region (0x40000000 - 0x5FFFFFFF) as RW for privileged mode and No Access for unprivileged mode. I found a subregion of 0x400FF000 to around 0x400FF100 can still be accessed by unprivileged mode and doesn't trigger bus fault. It seems that sysmpu does not take effect in that subregion.

Is there anyone knows the reason?

[EdwinHz]

This is a repeated post, please refer to the following post instead: https://community.nxp.com/t5/Kinetis-Software-Development-Kit/FRDM-K64F-MPU-doesn-t-take-effect-on-s...