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From: cheung@moncskermit.oz (Lawrence Cheung)
Newsgroups: net.wanted
Subject: access physical memory under UNIX
Message-ID: <269@moncskermit.oz>
Date: Wed, 20-Nov-85 19:46:09 EST
Article-I.D.: moncsker.269
Posted: Wed Nov 20 19:46:09 1985
Date-Received: Sat, 23-Nov-85 04:59:04 EST
Distribution: net
Organization: Comp Sci, Monash Uni, Australia
Lines: 14
Keywords: physical memory

In our image processing work, we are trying to interface a frame 
grabber to a National Semiconductor VR32 unix machine running on 
System V R 2.  In order to have very fast access to the frame store, 
we intend to put the frame grabber in the physical memory map and
access the frame grabber through its PHYSICAL ADDRESS, so the question 
is:

1) Can we access a physical address directly in UNIX without using a 
   device driver?

2) Can we have fast access to the frame grabber using any other means?

PS. NS VR32 is a 2 users machines and using multibus and NS32016 
    processor.
D