Most recent kernel where this bug did not occur: 2.6.22.6 Distribution: Gentoo Linux Hardware Environment: lspci output: 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express Memory Controller Hub (rev 03) 00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express PCI Express Root Port (rev 03) 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02) 00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 02) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02) 01:00.0 VGA compatible controller: nVidia Corporation Quadro NVS 110M / GeForce Go 7300 (rev a1) 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. Unknown device 8168 (rev 01) 03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02) 04:01.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b3) 04:01.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C552 IEEE 1394 Controller (rev 08) 04:01.2 Generic system peripheral [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 17) 04:01.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 08) Problem Description: I get the following message in dmesg: ACPI: bus type pci registered PCI: BIOS Bug: MCFG area at e0000000 is not E820-reserved PCI: Not using MMCONFIG. PCI: PCI BIOS revision 3.00 entry at 0xf0031, last bus=5 PCI: Using configuration type 1 Setting up standard PCI resources ACPI: Interpreter enabled ACPI: (supports S0 S1 S3 S4 S5) ACPI: Using IOAPIC for interrupt routing ACPI: PCI Root Bridge [PCI0] (0000:00) PCI: Probing PCI hardware (bus 00) PCI quirk: region 0800-087f claimed by ICH6 ACPI/GPIO/TCO PCI quirk: region 0480-04bf claimed by ICH6 GPIO PCI: Transparent bridge - 0000:00:1e.0 PCI: Bus #05 (-#08) is hidden behind transparent bridge #04 (-#05) (try 'pci=assign-busses') Please report the result to linux-kernel to fix this permanently After adding pci=assign-busses it works ok Thanks
Is this just a warning which I left in to be sure that the reason for it is properly dealt with, but we removed it from the normal user's sight now because we found * that the PCI misconfiguration which is being indicated in this message only seems to be an issue with CardBus and * that the CardBus fixup code which we have in place since 2.6.18 with appears to be sufficient. Thus, I submitted a patch which was merged mainline with 2.6.22.6 and 2.6.23 that turns it into a message which is only enabled when debugging PCI, so in practical users terms, the warning is gone. *** This bug has been marked as a duplicate of bug 7531 ***
Thanks a lot