DMA, help!

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#1888

From: Magnus L|vkvist
Date: Thu, 12 Nov 1992 17:53

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Im trying to write a device driver for a device that uses DMA to put a lot
of data into RAM. (On an ISA machine).

There is this problem with the OS/2 2.0 paged memory. How do I handle this?
Is there a way for me to allocate continous pieces of non-swappable 
physical memory in which the DMA puts the data?

Or should I use "scatter read" which I don't even know what it is and
haven't a clue how to implement. If this is the best solution where do I find
more information about it? And if this is the way to do it does it demand
something special from the hardware?


Any advice is very welcome!

Magnus

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Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!ira.uka.de!ira.uka.de!gmd.de!Germany.EU.net!mcsun!sunic!corax.udac.uu.se!Minsk.docs.uu.se!manne
From: manne@Minsk.docs.uu.se (Magnus L|vkvist)
Newsgroups: comp.os.os2.programmer
Subject: DMA, help!
Date: 12 Nov 92 17:53:57 GMT
Organization: Uppsala University
Lines: 16
Message-ID: <manne.721590837@Minsk>
NNTP-Posting-Host: minsk.docs.uu.se
Keywords: DMA device driver C