Hmm, now I feel it has nothing to do with the numbers of the DMA adapters
but with the numbers of the map registers. As Max suggested earlier, I
should ask for *unlimited* map registers. How does Windows implement the
map registers for x86?
Thanks
Ta H.
From: “Peter Viscarola”
>Reply-To: “NT Developers Interest List”
>To: “NT Developers Interest List”
>Subject: [ntdev] Re: DMA for Read/Write simultaneously [Revisit]
>Date: Fri, 19 Apr 2002 12:27:19 -0400
>
>“Ta H.” wrote in message news:xxxxx@ntdev…
> >
> > write is in effect, that read won’t start until I free map registers in
>my
> > write DPC; ie, the wtite DMA is done.
> >
>
>Did you try calling IoAllocateDmaAdapter twice? Once for each Device
>Object? And using one adapter for read and one for write?
>
>I don’t think that’s the problem, frankly, but it’s easy and worth a try…
>
>Peter
>OSR
>
>
>
>
>
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