Re: Alpha: virt_to_bus/GFP_DMA problem

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 13 Dec 1999 13:32:56 +0000 (GMT)

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> > on an ISA bus. It sounds like the ISA bus DMA is being remapped by your
> > chipset to a 16Mb window somewhere intelligent. If your board is mapping
> > the ISA bus to the low 16Mb of RAM thats good.
>
> Alan, I think you are mistaken here.=20
>
> When a device uses ISA DMA it is the DMA-controller that generates the
> addresses. The DMA controller does not need to be connected though the
> ISA bus it self.=20

The card being discussed was bus mastering.

Alan

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In reply to: Carlo E. Prelz: "2.3.31: oops probably caused by hardware. But what?"