[mythtv-users] Strange Ceton issues.

Jay Ashworth jra at baylink.com
Thu Aug 4 17:29:01 UTC 2011

----- Original Message -----
> From: "Larry Finger" <Larry.Finger at lwfinger.net>

> If the device only supports 32-bit DMA addressing, then a 64-bit
> kernel and a
> PAE kernel have the same issues: The DMA buffers must have a physical
> address in
> the lowest 4GB of RAM. I have no idea why it should work with 3 GB and
> not with
> 4. That makes no sense.

If I'm not mistaken, the constraint isn't actually "lowest 4GB"; the 
bounce buffers have to be in the *user* space (ie: generally the lower 3GB),

And depending on your configuration, it could actually be 2/2 and not 3/1.

-- jra
Jay R. Ashworth                  Baylink                       jra at baylink.com
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Ashworth & Associates     http://baylink.pitas.com         2000 Land Rover DII
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