2.21 Execute-only memory

Execute-only memory (XOM) allows only instruction fetches. Read and write accesses are not allowed.

Execute-only memory allows you to protect your intellectual property by preventing executable code being read by users. For example, you can place firmware in execute-only memory and load user code and drivers separately. Placing the firmware in execute-only memory prevents users from trivially reading the code.

Note:

The ARM architecture does not directly support execute-only memory. Execute-only memory is supported at the memory device level.
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