Upon further review... I think any actual base board schematics / pinouts touching the Nvidia hardware directly is indeed kept behind some sort of NDA or OEM license agreement and is specifically kept out of any of those documents for the Open Compute project JBOG rigs.
I think this is literally the impetus for their OAM spec which makes the pinout open and shareable. Up until that, they had to keep the actual designs of the baseboards out of the public due to that part being still controlled Nvidia IP.
Hmm interesting, I was linked to an OCP dropbox with a version that did have the connector pinouts. Maybe something someone shouldn’t have posted then…
I could find OCP accelerator spec but it looks like an open source reimplementation, not actual SXM2. That said, the photos of SXM2-PCIe adapters I could find look almost entirely passive, so I don't think all hopes are lost either.
couldn't someone just buy one of those chinese sxm2 to pcie adapter boards and test continuity to get the pinouts? I have one that could take like 10 minutes
