Path: utzoo!attcan!uunet!lll-winken!csd4.milw.wisc.edu!bbn!gatech!udel!mmdf
From: EPRF%SNYCENVM.BITNET@cornellc.cit.cornell.edu (Peter Flass)
Newsgroups: comp.os.minix
Subject: Re: What's the magic about using DMA??
Message-ID: <15600@louie.udel.EDU>
Date: 16 May 89 20:19:39 GMT
Sender: mmdf@udel.EDU
Lines: 36

On Tue, 16 May 89 15:45:03 GMT Marshall Cline said:
>Two questions:
>
>(1) I recently read in the Minix textbook (Prentice Hall) about a DMA
>caveat that AST had discovered.  It had something to do with wrapping
>around 64K barriers as I recall.  Anyway, I can't find the specifics
>now that a friend needs them :-(
>QUESTION: Does anyone know the information to which I am refering? Page#?
  Try page 152 - the DMA address register will not generate a carry over
a physical 64k boundary.
>
>(2) AST mentioned that there is minimal documentation for using DMA.
>QUESTION: Does anyone know a pointer to more detailed doc on DMA?
  Nope, sorry...can't help.
>
>Thanks in advance
>Marshall
>
>	________________________________________________________________
>	Dr. Marshall P. Cline	ARPA:	cline@sun.soe.clarkson.edu
>	ECE Department		UseNet:	uunet!sun.soe.clarkson.edu!cline
>	Clarkson University	BitNet:	BH0W@CLUTX
>	Potsdam, NY  13676	AT&T:	(315) 268-6591
>--
    - Pete


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