Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!rice!sun-spots-request
From: shaig@shum.huji.ac.il
Newsgroups: comp.sys.sun
Subject: DMA
Keywords: Hardware
Message-ID: <8124@brazos.Rice.edu>
Date: 24 May 90 19:14:15 GMT
Sender: root@rice.edu
Organization: Sun-Spots
Lines: 6
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 9, Issue 177, message 13

I am currently preparing a device driver for a card that performs DMA to
addresses on a Sun4/60 S-bus. One of the limitations that I have
encountered is that the DMA memory area is limited to 600Kb, and the
memory buffers that my device would like to work with can reach 3*192Kb
each. Is it possible to reconfigure the kernel to a DMA size of say 900Kb?
If so how? If not, what is the cause of the actual limitation?