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

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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 <[email protected]>
To: Jon Schindler <[email protected]>
CC: [email protected], [email protected]
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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