Article View: comp.sys.sun
Article #7370Strange behaviour of /dev/mem
From: Mark Bush
Date: Tue, 02 Apr 1991 15:00
Date: Tue, 02 Apr 1991 15:00
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1276 bytes
The manual page (SunOS4.1.1) for mem(4S) says:
All Systems
mem is a special file that is an image of the physical
memory of the computer. It may be used, for example, to
examine (and even to patch) the system.
On the Sun4 and Sun3 systems here, the result of `wc < /dev/mem' gives the
size of physical memory (sometimes a small number of whole kbytes short).
This is also true of SS2s.
However, on SLC, IPC and SS1+ machines here, the result is always exactly
4Meg regardless of the amount of physical memory the machines have!
I can't find anything in the manuals to explain this behaviour. Anyone
able to explain why /dev/mem falls short on these machines?
Mark
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!cunews!bnrgate!brtph3!brchh104!brchs1!bnr.ca!rice.edu!sun-spots-request From: Mark.Bush@prg.oxford.ac.uk (Mark Bush) Newsgroups: comp.sys.sun Subject: Strange behaviour of /dev/mem Keywords: Miscellaneous Message-ID: <2302@brchh104.bnr.ca> Date: 2 Apr 91 15:00:00 GMT Sender: news@brchh104.bnr.ca Organization: Sun-Spots Lines: 18 Approved: Sun-Spots@rice.edu X-Original-Date: 2 Apr 91 00:44:37 GMT X-Sun-Spots-Digest: Volume 10, Issue 75, message 23 X-Note: Submissions: sun-spots@rice.edu, Admin: sun-spots-request@rice.edu