Date: Mon, 08 Mar 1999 12:07:39 -0800 From: Jason Thorpe <thorpej@nas.nasa.gov> To: Andy Doran <ad@psn.ie> Cc: Mike Smith <mike@smith.net.au>, freebsd-hackers@FreeBSD.ORG Subject: Re: Erorr: isa_dmainit(2, 1024) failed Message-ID: <199903082007.MAA02543@lestat.nas.nasa.gov>
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On Mon, 8 Mar 1999 18:34:38 +0000 (GMT)
Andy Doran <ad@psn.ie> wrote:
> I've run into the same kind of problem when working on a driver for
> NetBSD recently. The solution would be to use NetBSD's BUS_DMA(9), but
> this card needs a DMA buffer which has *crazy* alignment and position
> requirements. One of them is that the buffer needs to be within the first
> 8MB, hence the same problem.
Well, your driver was for a non-i386 architecture :-) And, the suggestion
I gave on port-pmax@netbsd.org is already employed by NetBSD/i386 to
"reserve" memory for ISA DMA.
That is to say, the Right solution for this is multiple memory free lists,
which NetBSD's UVM has support for.
-- Jason R. Thorpe <thorpej@nas.nasa.gov>
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