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- Newsgroups: comp.unix.bsd
- Path: sparky!uunet!psinntp!dg-rtp!ponds.uucp!rivers
- From: rivers@ponds.uucp (Thomas David Rivers)
- Subject: Re: [386bsd] NMI messages on the console and log.
- References: <3806@tansei1.tansei.cc.u-tokyo.ac.jp>
- Message-ID: <1992Dec29.013202.7291@ponds.uucp>
- Date: Tue, 29 Dec 1992 01:32:02 GMT
- Lines: 33
-
-
- These indicate memory problems (memory parity problems) with your
- motherboard.
-
- It is possible that such problems are caused by DMA devices you
- may have, and, if you have an older motherboard, its interaction with
- the memory subsystem.
-
- Also, if you have a newer motherboard, it could be related to the
- BUS timings (which is configuarable in the setup of newer motherboards.)
-
- Also, some older motherboards have the habit of asserting this error
- if there is a parity problem on the AT-BUS instead of the memory.
-
- A card which is known to behave this way with older motherboards is
- the Adaptec 1542 SCSI controller. Fortunately, that card contains a
- test for this situation in the card's ROM (see you manual for how to
- execute this test.)
-
- Finally, I owned such an old machine (a DTK KEEN 2000) which,
- although it passed the Adaptec test had the same problems. I believe
- it just wasn't correct (it also had similar problems with ISC Unix) and
- fell into the situation where it asserted the AT-BUS parity problems.
- (That is, all memory tests showed everthing to be correct; but 386bsd
- and ISC Unix 2.0.2 would still demonstrate the problem.) Since they
- are rather cheap now, I simply replaced the motherboard with a newer one.
-
- By the way, I did notice that linux didn't seem to have a problem like
- this, nor did 386bsd v0.0. However, it may be that at the time, these
- OSs simply didn't log these problems.
-
- - Dave Rivers -
- (rivers@ponds.uucp)
-