Messages in this thread | | | Subject | Re: A DMA patch for linux 2.2.9 | Date | Fri, 9 Jul 1999 00:51:14 +0100 (BST) | From | Alan Cox <> |
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> > 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)
This is (unfortunately) very common on PCI cards aimed solely at the PC market. We have for example..
ES1370 top 4 bits of irq registered wired to 0 ESS Maestro 27bit addressing limit. All audio dma buffers within 4 256K chunks
Alan
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