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Usefulness of MPU in a non-OS system

Matic over 9 years ago

Hi.

We are developing a product which has to achieve some safety requirements. The system is quite simple, non-OS, running in a Privileged mode only on a Cortex-M4. I would like to implement a Memory Protection Unit somehow. Could you please give any advice, in which way could be MPU implemented for that kind of system?

If I am correct, one possibility is to protect system from stack overflow. Any other thoughts?

Thank you

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0 Niall Cooling over 9 years ago
There are a number of reasons setting up the MPU with is worthwhile even on a non-RTOS systems (we advise if an MPU is available to always use it).
For example
Tying to read at an address that is reserved in the memory map (i.e. no physical memory of any type there)
Trying to write to Flash/ROM
Stopping areas of memory being accessible (e.g. stack overflow)
Disable running code located in SRAM (eliminating potential exploit)
I have written about this and setting up the MPU at:
https://blog.feabhas.com/2013/02/setting-up-the-cortex-m34-armv7-m-memory-protection-unit-mpu/
regards,
Niall.
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0 Niall Cooling over 9 years ago
There are a number of reasons setting up the MPU with is worthwhile even on a non-RTOS systems (we advise if an MPU is available to always use it).
For example
Tying to read at an address that is reserved in the memory map (i.e. no physical memory of any type there)
Trying to write to Flash/ROM
Stopping areas of memory being accessible (e.g. stack overflow)
Disable running code located in SRAM (eliminating potential exploit)
I have written about this and setting up the MPU at:
https://blog.feabhas.com/2013/02/setting-up-the-cortex-m34-armv7-m-memory-protection-unit-mpu/
regards,
Niall.
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