[mythtv-users] Strange Ceton issues.
Larry.Finger at lwfinger.net
Thu Aug 4 17:22:36 UTC 2011
On 08/04/2011 10:31 AM, Erik Jensen wrote:
> Well, maybe, but it works fine on my AMD 64-bit machine with 16 GiB of
> RAM, so there must be at least one other piece to the puzzle.
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.
The tricky part is when you are dealing with ISA devices with 24-bit addressing,
or some PCI devices with 30-bit addressing. Finding low memory that satisfies
these conditions is harder.
As the DMA APIs are not that hard to follow, only Erik's observation seems to be
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