Diagnostic tool recommendations?
>First, kudos to the Debian and Linux developers. I was given a
>PS/2 Model 80 (386 - Microchannel (MCA) machine) with an
>MCA IDE controller. I added a 2 GB IDE drive and an ATAPI
>CDROM. The debian installation went flawlessly!!! Both the
>hard disk and CDROM were recognized and usable.
>I'm impressed and very happy. Almost. :-( I get segmentation
>faults at various times after using the system for awhile.
>I suspect that this could be do to a bad memory SIMM.
>I've got five 2 MB SIMMs spread across two MCA memory
>expansion cards for a whopping 11 MB (1MB on system board).
>I think that one of these SIMMs could be bad. Can anyone
>suggest tools for locating the bad SIMM? (If not, I'll just start
>pulling them one at a time.) Or should I be looking else where
>for the problem?
>Symptoms: Seg fault error may occur at any time, running any program.
>No problems under DOS. (But I understand that DOS isn't nearly as
>aggressive in using memory as Linux.)
>Thanks for any help
>Tony Richardson
The fact that you do not get segfaults under dos is because you spend most
of your time there in non-protected mode. A segment fault means violating
the segment limits. The segment tables are cached in the cpu (for the
active segment) but the tables are stored in ram. Your first 1 meg of
memory is probably OK as it would be mapped to the lower 1m (used by dos).
I thought that there were some kernal options dealing with the MCA and
maybe these need to be compiled in for the model 80.
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