STM32F7 MPU performance impact?

[David Littell]

Posted on July 21, 2017 at 23:36

Greetings,

After reading

http://www.keil.com/support/docs/3777.htm

it seems like a good idea to change the SDRAM attributes via the MPU.  Can anyone comment on the performance impact of enabling the MPU (it's not currently enabled in our application)?

Thanks,

Dave

[Tesla DeLorean]

Posted on July 21, 2017 at 23:52

My take away is that it's better to remap the memory. Uncached SDRAM is surely not very desirable.

I know you can fault an M3/M4 if you access a 64-bit (int or double) using LDRD/STRD that is unaligned, haven't tried the M7, and the M0 is a bigger headache like the old ARM7/ARM9 parts