Re: USB storage does not work with 3GB of RAM, but does with 2G of RAM

["Jon Schindler" <jonschindler@hotmail.com>]

Do you know if there is a way to tell the ehci driver to do the DMA at a 
lower memory address?  i.e. tell the kernel to reserve a block of memory (as 
a boot option) and then tell the ehci driver to use that area of RAM 
instead?

Thanks again for your help,

Jon

>From: Andi Kleen <ak@suse.de>
>To: Jon Schindler <jonschindler@hotmail.com>
>CC: ak@suse.de, linux-kernel@vger.kernel.org
>Subject: Re: USB storage does not work with 3GB of RAM, but does with 2G of 
>RAM
>Date: Sat, 9 Jul 2005 02:56:38 +0200
>
>On Fri, Jul 08, 2005 at 08:49:12PM -0400, Jon Schindler wrote:
> > Hi Andi,
> >
> > As you suggested, removing ehci_hcd (using rmmod ehci_hcd) allows the 
>USB
> > storage device to work.  So, to answer your question, yes, the ohci_hcd
> > driver does work with 3GB's of RAM.  Still, knoppix 3.9 IS able to work
> > with both ehci and 3GB's of RAM, so it still sounds like it's a software
> > problem, not an nvidia hardware issue.
>
>Knoppix is 32bit I guess. The 32bit kernel will do a lot of DMA
>only in the first 800-900MB (lowmem)
>
>-Andi
>
>-
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