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From: cheung@moncskermit.oz (Lawrence Cheung)
Newsgroups: net.unix-wizards
Subject: Need help in accessing physical address in Unix
Message-ID: <270@moncskermit.oz>
Date: Sun, 1-Dec-85 20:18:08 EST
Article-I.D.: moncsker.270
Posted: Sun Dec  1 20:18:08 1985
Date-Received: Tue, 3-Dec-85 07:33:14 EST
Organization: Comp Sci, Monash Uni, Australia
Lines: 14
Keywords: physical memory address

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 other means?

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