2003-03-09 13:38:53

by Mikael Starvik

Subject: RE: [PATCH] Avoid PC(?) specific cascade dma reservation inkernel /dma.c

>I don't know of any PC cards that can support ISA DMA channel 4 so I
>guess simply because of that it hasn't happened. Do you actually
>know of any DMA 4 capable ISA devices or is it used for onboard
>ISA devices ?

In this case it is used in a non ISA capable system where DMA channel
numbers doesn't relate to ISA numbers in any way.

/Mikael

2003-03-09 19:15:50

by Alan

Subject: RE: [PATCH] Avoid PC(?) specific cascade dma reservation inkernel /dma.c

On Sun, 2003-03-09 at 13:49, Mikael Starvik wrote:
> >I don't know of any PC cards that can support ISA DMA channel 4 so I
> >guess simply because of that it hasn't happened. Do you actually
> >know of any DMA 4 capable ISA devices or is it used for onboard
> >ISA devices ?
>
> In this case it is used in a non ISA capable system where DMA channel
> numbers doesn't relate to ISA numbers in any way.

So what happens if someone plugs a PCI/ISA bridge into an axis system.
Surely you should be reporting no ISA DMA and having a set of similar
axis specific DMA handlers - or does it really look so close to ISA think ?