Date: Tue, 1 Feb 2000 00:02:20 +0100 (CET) From: wjw@iae.nl (Willem Jan Withagen) To: hackers@freebsd.org Subject: Bad memory suspected Message-ID: <20000131230220.7328CBFD1D@surf.iae.nl>
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Hi, Being probably bitten again by some bad memory, I'm considering applying some of my old (VLSI) testingskills to this. However..... I'm in dire need of some hints, some because I haven't kept up with the intimate details of Intel hardware, nor do I know how to get a lineair memory space for all the fysical memory available in the system. The starting problems are: 1) I'd like to do this als a loadable kernel module, so one would load this module on the boot-prompt and let it eat away CPU time until it is rebooted. Now is there a module example which I can use to get me an easy setup for plugging inthe memory-test modules. Starting with simple things like "walking 0 and 1's", but ending up with O(n^2) tests to check for dependancies on surrounding values 2) Cache is a friend and a fiend in this: It helps fast execution of the code, but prevents data really getting to the silicon. So all experience in this is welcomed. Bluntly I can disable all caching (which would be nice for starters), but once we get to the more complex testingpatterns CPU-cycles do start to count. 3) PC memory layouts used to be a major art just by itself in the old days when we still used DIP 4116's, how is that in the current time with SIMM, DIMM, RAMBUS, PCI-bridges, ECC, ..... Any pointers to nightly reading material?? Thanx, --Willem Jan I once had a TRS-80 test run for 3 days, before it gave in, but then the error was reproducable and pinpointed the actual chip to be replaced. Which did fix the problem. -- Internet Access Eindhoven BV., voice: +31-40-2 393 393, data: +31-40-2 606 606 P.O. 928, 5600 AX Eindhoven, The Netherlands Full Internet connectivity for only fl 9.95 a month. Call now, and login as 'new'. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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