ARM Architecture - Bus Architecture
What could cause a bus fault on an ARM system even if the MPU permits access to the memory region?
What could cause a bus fault on an ARM system even if the MPU permits access to the memory region?
medium📝 Analysis Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand MPU vs hardware faults
MPU controls access permissions, but hardware faults can still cause bus faults.Step 2: Identify hardware fault causes
Non-responsive or faulty peripherals cause bus faults despite MPU permissions.Step 3: Eliminate other options
Incorrect MPU settings would block access, privileged mode does not cause faults, caching does not cause bus faults.Final Answer:
Peripheral hardware is not responding or is faulty -> Option AQuick Check:
Hardware faults cause bus faults despite MPU [OK]
Quick Trick: Hardware faults cause bus faults despite MPU permissions [OK]
Common Mistakes:
- Blaming MPU permissions for all bus faults
- Assuming privileged mode prevents bus faults
- Confusing caching effects with bus faults
Master "Bus Architecture" in ARM Architecture
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