Messages in this thread | | | Date | Wed, 2 Nov 2005 16:38:20 +0100 (CET) | From | Andreas Kleen <> | Subject | Re: PCI-DMA: high address but no IOMMU - nForce4 |
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[full quote] Am Di 01.11.2005 06:21 schrieb Marc Perkel <marc@perkel.com>:
> > On Fri, Oct 28, 2005 at 12:16:51AM +0200, Andi Kleen wrote: > > > > I will attach my own; A brand new Amd64 dual-core thing. > > Works fine with mem=2500M, but blows up with mem=3G or > > without any override and full 4G complement in use. > > > > This board (ASUS A8N-SLI) does use NVIDIA nForce4 chipset with > > bios-option to map (hoist) "excess memory" out from first 4G to > > higher physical addresses so that it can be accessed by the > > processor. > > > > This board has no AGP at all in it, but it does have lots > > of PCIE, and a bit of PCI-X thrown in for "legacy cards". > > Somehow that detail breaks things when the machine really > > should use bounce-buffering, or something similar -- I don't > > know if Nvidia nForce4 chipset does have IOMMU, though... > > > > If Nvidia did omit such essential piece of hardware from > > a modern chipset, I do find it amazingly short-sighted... > > (Of course they don't yield documentation of the chips to > > public so that I can't quickly verify this detail...) > > > For what it's worth I have almost the exact same hardware and got the > same > error. Athlon X2 4400 with the same ASUS board. Reverting to 2.6.13.2 > kernel works. >
This sounds like the PCI-X BIOS misconfiguration issue that Andy C. recently tracked down. Andy do you agree? If yes it's a BIOS problem, but we can probably work around it with a quirk. -Andi
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