[Bug 263038] PCI "failed to allocate initial prefetch window" on AMD Opteron

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263038

            Bug ID: 263038
           Summary: PCI "failed to allocate initial prefetch window" on
                    AMD Opteron
           Product: Base System
           Version: 13.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jfc@mit.edu

Both of my HPE MicroServer Gen10 (Opteron X34xx) servers report "failed to
allocate initial prefetch window" for one of the PCI bridges during boot.  This
does not prevent the attached device from working.

CPU: AMD Opteron(tm) X3421 APU                       (2096.18-MHz K8-class CPU)
  Origin="AuthenticAMD"  Id=0x660f01  Family=0x15  Model=0x60  Stepping=1
...
pcib2: <ACPI PCI-PCI bridge> at device 2.5 on pci0
pcib2: failed to allocate initial prefetch window: 0xf0800000-0xf08fffff
pci2: <ACPI PCI bus> on pcib2
bge0: <HP Ethernet 1Gb 2-port 332i Adapter, ASIC rev. 0x5720000> mem
0xfe900000-0xfe90ffff,0xfe910000-0xfe91ffff,0xfe920000-0xfe92ffff at device 0.0
on pci2

# pciconf -vl pci0:2
hostb1@pci0:0:2:0:      class=0x060000 rev=0x00 hdr=0x00 vendor=0x1022
device=0x157b subvendor=0x0000 subdevice=0x0000
    vendor     = 'Advanced Micro Devices, Inc. [AMD]'
    device     = 'Family 15h (Models 60h-6fh) Host Bridge'
    class      = bridge
    subclass   = HOST-PCI

This message has been in my logs since December 2019 running an early version
of FreeBSD 13.  I have not run FreeBSD 12 or 14 on these servers.

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