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

[Jon Schindler]

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@xxxxxxx>
> To: Jon Schindler <jonschindler@xxxxxxxxxxx>
> CC: ak@xxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
> 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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