PCIe bifurcation doesn't work
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linux
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server
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Description
If a PCIe slot is using bifurcation to implement a dual x8 ports as an example on a x16 port, the attached PCIe device is not recognized. That is an issue on most OCP nodes which are intensively using PCIe bifurcation. A workaround is to directly plugged the PCI card into the master slot.
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
Start by reproducing the failure with a PCIe x16 slot bifurcated into dual x8 ports, comparing it with the direct master-slot workaround. Trace PCIe device enumeration in the firmware and document a reproducible configuration and test showing that both attached devices are recognized.
Written by the indexing model from the issue text.
Assessment
- Domain
- embedded-iot
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100