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

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

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.

Jon

> From: Andi Kleen <ak@suse.de>
> To: "Jon Schindler" <jonschindler@hotmail.com>
> CC: linux-kernel@vger.kernel.org
> Subject: Re: USB storage does not work with 3GB of RAM, but does with 2G of 
> RAM
> Date: 08 Jul 2005 21:29:37 +0200
>
> "Jon Schindler" <jonschindler@hotmail.com> writes:
> >
> > This mainly seems to be an issue with USB mass storage devices like
> > USB memory sticks and USB hard drives (I've tried both, and neither is
> > assigned a scsi device properly).  I am still able to use my USB mouse
> > when I have 3GB installed.  I'm not sure if that makes it a USB 1.1
> > issue or a USB storage issue, but hopefully someone will have some
> > insight after looking at the logs.  Thanks in advance for any help.
>
> It sounds like the Nvidia EHCI controller has trouble DMAing to high
> addresses. Would be a bad bug if true.
>
> Does it work when you disable EHCI and only enable OHCI? (this will
> limit you to USB 1.1)
>
> -Andi
> -
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