The ARMv8 Debug Implementation Envelope architectural reference document describes unpredictable behaviors associated with Debug. Some topics list behavior Options and many include a Preference behavior. For any particular topics that have multiple options, the information in this section describes which option the Cortex-A53 processor implements. Additionally, for any particular topics for which the Cortex-A53 processor behavior diverges from either or both of the Options and Preferences, an explanation of the actual behavior is given. If there is only a single Option for a specific topic in ARMv8 Debug Implementation Envelope, if the Cortex-A53 processor follows the recommended behavior, then there are no more explanatory comments in this appendix for that topic or behavior.