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Fix for issue #394. #402

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silabs-oysteink
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  • Removed 'enable_i' from LFSR modules.
  • It is no longer possible to write a locked up value to the LFSR, detection is now independent of the enabling of dummies or hint replacements.

Not SEC clean:

  • Alert minor caused by writing a locked up value when dummies/hint replacements are disabled.
  • Previously, a locked up value could be stored in the LFSR, resulting in a difference in which dummy or hint was generated on the first instruction after enabling.

Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com

- Removed 'enable_i' from LFSR modules.
- It is no longer possible to write a locked up value to the LFSR, detection is now independent of the enabling of dummies of hints replacements.

Not SEC clean:
- Alert minor caused by writing a locked up value when dummies/hint replacements are disabled.
- Previously, a locked up value could be stored in the LFSR, resulting in a difference in which dummy or hint was generated on the first instruction after anbling.

Signed-off-by: Oystein Knauserud <Oystein.Knauserud@silabs.com>
@silabs-oysteink silabs-oysteink added the Component:RTL For issues in the RTL (e.g. for files in the rtl directory) label Feb 2, 2023
@Silabs-ArjanB Silabs-ArjanB merged commit df6c2cd into openhwgroup:master Feb 2, 2023
halfdan-dolva pushed a commit to halfdan-dolva/cv32e40s that referenced this pull request Mar 13, 2023
Signed-off-by: Oivind Ekelund <oivind.ekelund@silabs.com>
halfdan-dolva pushed a commit to halfdan-dolva/cv32e40s that referenced this pull request Mar 13, 2023
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