Re: Enabling NVAGP and disabling GART_IOMMU?

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On Thu, Jun 15, 2006 at 10:45:22PM +0100, Chris Jones wrote:
 > 
 > > So what about the official documentation about this not being possible:
 > >
 > >     Please note that NVIDIA's internal AGP support cannot work if AGPGART
 > > is either statically compiled into your kernel or is built as a module and
 > > loaded into your kernel. Please see Appendix F for details. Default: 3.
 > 
 > Its wrong :)
 > 
 > jonesc@localhost ~ > uname -a
 > Linux localhost.localdomain 2.6.16-1.2133_FC5 #1 Tue Jun 6 00:52:14 EDT 2006 
 > i686 i686 i386 GNU/Linux
 > 
 > jonesc@localhost ~ > cat /proc/driver/nvidia/agp/status
 > Status:          Enabled
 > Driver:          NVIDIA
 > AGP Rate:        4x
 > Fast Writes:     Disabled
 > SBA:             Disabled
 > 
 > the "agp=off" seems to be a little known kernel option, but works just fine.

"works"

Unless you happen to use the IOMMU, in which case the nvidia module will
happily stomp over random bits of data in the AGP aperture destined for
your disk.  (The IOMMU shares the AGP aperture, but only the in-kernel
drivers know how to share it).

		Dave

-- 
http://www.codemonkey.org.uk

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