[Bug 292949] NVME drives behind PEX switch not detected by OFW PCI driver

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292949

            Bug ID: 292949
           Summary: NVME drives behind PEX switch not detected by OFW PCI
                    driver
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: tpearson@raptorengineering.com

Created attachment 267799
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=267799&action=edit
pciconf

On a Raptor Computing Systems Blackbird (POWER9) host with a Microsemi PEX PCIe
switch installed, the downstream NVMe devices attached to the PEX card at boot
are not enumerated by the OFW PCI driver stack.

All drives are enumerated and work properly in both the bootloader and in a
current Linux kernel.

A dump of the entire device tree, dmesg, and pciconf is attached.

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