PROBLEM: PCI: mmconfig does not work with my ASUS K8N4-E board

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Hello,

I am reporting this to the kernel mailing list on the advice of Greg KH.

I would like to report a problem with my ASUS K8N4-E board/CK804 chipset.
Basically, kernels from 2.6.14 do not boot correctly unless I use the kernel option pci=nommconf. I have tested this with several kernels, including a vanilla 2.6.14, 2.6.15, 2.6.16 and 2.6.17-rc4. Searching on google indicated that several people have similar problems with similar hardware - obviously I can't say for sure that it is exactly the same problem, but in at least two other cases, disabling mmconfig
enabled the system to boot.

Note that I can also boot by disabling ACPI, which requires me to specify
in the BIOS that the operating system in use is "non-PnP" in order for the
mouse to work.   If I specify
ide=nodma as a kernel parameter, I can boot, but various other components
including the nVidia ethernet (forcedeth driver) do not work.

I have included the end of the messages printed by
the kernel on bootup when mmconfig is not disabled below. I can happily either post additional information such as .config, dmesg (when the kernel is booted with mmconfig disabled) or lspci output to the mailing list or send it by e-mail to
anyone who is interested, but I have not posted anything initially to avoid
clogging up the list.

Please note that I am not subscribed to the mailing list, so I would request you to CC me any answers you would like me to reply to fast. This e-mail address is not permanent, but I will monitor it at least as long as this thread is relevant.

Regards and thanks,

Michael

End of bootlog when mmconfig is active follows:

NFORCE-CK804: IDE controller at PCI slot 0000:00:06.0
NFORCE-CK804: chipset revision 242
NFORCE-CK804: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0x1000-0x1007, BIOS settings: hda:DMA, hdb: DMA
NFORCE-CK804 Bus-Master DMA disabled (BIOS)
hda: WDC WD1600JB-00REA0, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hdc: HL-DT-ST DVDRAM GSA-4167B, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 ob irq 15
SCSI subsystem initialized
hda: max request size 1024KiB
hda: cache flushes supported
hda:<4>hda: dma_timer_expiry: dma_status == 0xff
hda: dma_timer_expiry: dma_status == 0xff
hda: dma_timer_expiry: dma_status == 0xff
(...)
Done.
Begin: Waiting for root file system... ...
hda: dma_timer_expiry: dma_status == 0xff
(...)
Done.
ALERT! /dev/hda2 does not exist. Dropping to a shell!
(shell...)

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