It turns out, after building 14 different commits between v5.8 and v5.9, that a three line change in drivers/pci/controller/pci-xgene.c breaks PCI on this machine. If I revert this file and build the commit that changed it, PCI works properly. No config options changed between these commits.
I suppose now it's just a matter of figuring out why this change breaks it, and how it can be fixed and applied to 5.9+.
On Tue, Feb 9, 2021 at 4:03 AM Valdis Klētnieks <valdis.kletnieks@xxxxxx> wrote:
On Mon, 08 Feb 2021 09:00:27 -0500, Evan T Mesterhazy said:
> Thanks, Greg - good suggestion regarding `git bisect`. I was able to narrow
> it down to a change between 5.8 and 5.9, so maybe that's the next logical
> thing to do. None of the config options added between those releases seemed
> relevant to the issue, but perhaps one of them is and I just don't realize
> it.
You're probably looking for a config option that was *removed* between
those releases.
Evan Mesterhazy
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