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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