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