[rv_core_ibex] Document that the CSRC instruction should not be used for manipulating the X bit of PMP entries
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IP:rv_core_ibex
Security: SW Guidance
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Description
Description
We've identified a minor issue with the CSRC instruction in Ibex (refer to lowRISC/Ibex#2193 for details) prior to tapeout. We have already made sure that the CSRC instruction is not used in a problematic way in ROM.
Going forward, we should document this in the software guidelines document to make it doesn't lead to issues e.g. in ROM_EXT.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Locate the software guidelines document and read the context around CSRC and PMP entries, using lowRISC/Ibex#2193 for the technical details. Document that CSRC must not be used to manipulate the X bit of PMP entries; done when the guidance covers future software such as ROM_EXT.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation, embedded-iot, security
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100