ARM Architecture - Bus Architecture
If the MPU is configured but not enabled on an ARM processor, what is the effect on memory access restrictions?
If the MPU is configured but not enabled on an ARM processor, what is the effect on memory access restrictions?
medium📝 Analysis Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand MPU enable behavior
MPU must be explicitly enabled to enforce restrictions.Step 2: Consequence of MPU disabled
When disabled, MPU does not enforce any access restrictions.Step 3: Eliminate other options
No faults or automatic enabling occur if MPU is disabled.Final Answer:
All memory accesses proceed without MPU enforcement -> Option AQuick Check:
MPU disabled means no memory protection [OK]
Quick Trick: MPU must be enabled to enforce restrictions [OK]
Common Mistakes:
- Assuming MPU enforces rules when disabled
- Expecting automatic MPU enabling
- Confusing MPU faults with other exceptions
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