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**Type of issue**: bug report | feature request | question | other enhancement

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**Impact**: no rtl change | rtl refactoring | new rtl | unknown

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**Development Phase**: request | proposal

**Other information**
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**What is the current behavior?**

**What is the expected behavior?**

**Please tell us about your environment:**
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    - version: `git commit hash`
    - os: `Linux knight 4.4.0-92-generic #115-Ubuntu SMP Thu Aug 10 09:04:33 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux`
    - build environment: `ucb-bar/chipyard` `git commit hash`
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**What is the use case for changing the behavior?**
