Re: usb and too much memory?

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On Sat, 2006-07-15 at 15:42 +1200, Hadders wrote:
> Tom Horsley wrote: 
> > On Fri, 2006-07-14 at 21:52 -0400, Tom Horsley wrote:
> >   
> > > Is there some known problem with > 2 gig of memory and
> > > the onboard usb with the x86_64 kernels?
> > >     
> > 
> > Sure enough, when I take out the extra gig of memory,
> > the scanner starts working and the boot time USB errors
> > go away. I guess I have a spare gig now (which is all
> > it really was before - I just thought I'd put it to
> > use :-).
> > 
> >   
> It's often been an historical fact that PC chipsets (not server class)
> often don't like addressing large amounts of memory and require
> particular DIMM configurations.
> They also get fussy about EXACT memory timings. Check your mainboard
> manual (asus are good for providing this as a download) for
> recommendations on what banks can be used to get to 3GB.

Oh, I did all that. The memory has identical timing and
the i386 kernel as well as memtest86 has no problems, it
is only the x86_64 kernel that has USB troubles. I suspect
some sort of IOMMU nonsense, but the simplest fix is to
just leave only 2 gig in the machine in any case.

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