Messages in this thread | | | From | "Jon Schindler" <> | Subject | Re: USB storage does not work with 3GB of RAM, but does with 2G of RAM | Date | Fri, 08 Jul 2005 22:57:58 -0400 |
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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 <ak@suse.de> >To: Jon Schindler <jonschindler@hotmail.com> >CC: ak@suse.de, linux-kernel@vger.kernel.org >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 > >- >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/
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