dcr0@gte.com (Dave Robbins) (04/19/91)
I am running Ultrix 4.0 on a DECStation 3100 with 24MB of memory. The PROM code recognizes and tests 24MB of memory, but when Ultrix is booting up it insists that there is only 12MB of memory. Why? /vmunix is configured to expect 24MB ("physmem 24" in the config file). Is there something more I should do to tell Ultrix how much memory it has? Is there something it looks at in the hardware and there's not a doggone thing I can do about it? This is a fairly recent upgrade from 3.X, and if I remember correctly the earlier version did indeed recognize all 24MB (but I'm not positive about that). Did I waste my company's money on 12MB of memory? -- Dave Robbins GTE Laboratories Incorporated drobbins@gte.com 40 Sylvan Rd. ...!harvard!bunny!drobbins Waltham, MA 02254
ajc@thendara.pa.dec.com (AJ Casamento) (04/20/91)
Dave, If your operating system is only reporting 12MB of the 24MB that you have loaded have you tried re-seating the memory SIMMS? One of the prototype DS3100 units that I used to have caused me a similar problem when I added memory (though I will admit that I did the installation myself). Although generically the fact that the console level is able to see all 24MB indicates that the memory is properly installed. The only other time I've seen this is when somebody tries to mix 1Mbit and 4Mbit DRAMs in the same system (unlikely in your case) as Ultrix does not currently support such mixtures. I hope that this helps. Thanx, AJ ********************************************************************** * AJ Casamento "The question is not whether or * * Digital's TRI/ADD Program not the opinions are mine; but * * 100 Hamilton Ave. UCO1-B rather, which of my personalities * * Palo Alto, CA 94301-1616 do they belong to?" * * 415.853.6744 * * ajc@decwrl.dec.com * **********************************************************************
diamond@jit345.swstokyo.dec.com (Norman Diamond) (04/22/91)
In article <11029@bunny.GTE.COM> drobbins@gte.com writes: >I am running Ultrix 4.0 on a DECStation 3100 with 24MB of memory. The PROM >code recognizes and tests 24MB of memory, but when Ultrix is booting up it >insists that there is only 12MB of memory. Why? /vmunix is configured to >expect 24MB ("physmem 24" in the config file). Sounds like it might be something dumb (nothing personal; I've made the same dumb mistake before) like forgetting to copy the recompiled vmunix executable to /vmunix before rebooting..... -- Norman Diamond diamond@tkov50.enet.dec.com If this were the company's opinion, I wouldn't be allowed to post it.
dcr0@speedy.gte.com (Dave Robbins) (04/22/91)
In article <11029@bunny.GTE.COM> I write: >I am running Ultrix 4.0 on a DECStation 3100 with 24MB of memory. The PROM >code recognizes and tests 24MB of memory, but when Ultrix is booting up it >insists that there is only 12MB of memory. Why? I received several good followups via mail and news, and ... following the advice of more than one respondent, I dropped back into the PROM code and ran the self-test. All 24MB passed the self-test, but still /vmunix insisted that there was only 12MB of memory. Following one suggestion, I switched off the machine, opened up the box, and shuffled the SIMMs in the second 12MB. When I switched it back on again, the self-test still found 24MB of good memory (at least I didn't kill any of the SIMMs in the process :-). But ... when I booted /vmunix this time, *it found 24MB of memory* -- imagine that! So, I am now happily running with the system actually thinking it can use all of the memory that exists on the machine. Many thanks to all of you who responded to my query. Collectively, your suggestions did the trick. Of course, I might wonder: what is it about the SIMMs that the self-test sees them all but /vmunix sometimes doesn't? Oh well, mine is not to reason why. -- Dave Robbins GTE Laboratories Incorporated drobbins@gte.com 40 Sylvan Rd. ...!harvard!bunny!drobbins Waltham, MA 02254