Re: A DMA patch for linux 2.2.9
Dan Hollis (goemon@sasami.anime.net)
Thu, 8 Jul 1999 16:45:26 -0700 (PDT)
On Thu, 8 Jul 1999, H.J. Lu wrote:
> > - what about architectures that don't have this 16 MB
> > level (or something akin) limit??
> > Your patch addresses the first 2 points. Does it address
> > the 3rd?
> No. We don't have any hardwares like that here. However, it is trivial
> to add a global variable, say
> int dma_memory_limit = 1;
> to indicate if the architecture has the DMA memory limit and each
> architecture can turn it off at the runt-time. We then can do
Some PCI devices (eg Trident 4dwave-NX) have limited address space for DMA
registers (eg it can only address 1gb memory). So on really large machines
(eg 2gb) it is still possible to run out of DMA memory. 8)
-Dan
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