Bug 263038 - PCI "failed to allocate initial prefetch window" on AMD Opteron
Summary: PCI "failed to allocate initial prefetch window" on AMD Opteron
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 13.1-STABLE
Hardware: amd64 Any
: --- Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-04-04 13:38 UTC by John F. Carr
Modified: 2022-04-04 13:38 UTC (History)
0 users

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Description John F. Carr 2022-04-04 13:38:26 UTC 
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.