Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!elroy.jpl.nasa.gov!ncar!gatech!wrdis01!mips!sgi!shinobu!odin!anchor!olson
From: olson@anchor.esd.sgi.com (Dave Olson)
Newsgroups: comp.sys.sgi
Subject: Re: memory addressing on a 4D/25
Message-ID: <1991May30.025420.29471@odin.corp.sgi.com>
Date: 30 May 91 02:54:20 GMT
References: <9105291411.AA15427@nazgul.physics.mcgill.ca>
Sender: news@odin.corp.sgi.com (Net News)
Organization: Silicon Graphics, Inc.  Mountain View, CA
Lines: 29

In <9105291411.AA15427@nazgul.physics.mcgill.ca> loki@NAZGUL.PHYSICS.MCGILL.CA (Loki Jorgenson) writes:


| 	What is the highest address that has meaning for a 4D/25 (regardless
| of installed memory)? In terms of the hardware (ie. PROM maybe)?  Or
| system (kernel table upper limits maybe)?  Are there any presumed limits
| besides the maximum value of a 32-bit word (long/int)?
| 

The easiest way to determine this kind of info (if you don't have
hardware specs :) ) is to look at the files IP*.h for your machine
in /usr/include/sys.  The general memory map is in IP*addrs.h,
and the specific definitions of i/o addresses are in IP6.h, etc.

Also, there is a moderatly long discussion of VME address space
partitioning in /usr/sysgen/system, which varies somewhat with
machine type.

There is a bit more info than this in the publication:
  Writing Device Drivers for Silicon Graphics Computer Systems
  SGI Document #007-0911-010
but that is basicly it.

What problem are you trying to solve?
--

	Dave Olson

Life would be so much easier if we could just look at the source code.