I have a seemingly bad 32MB memory module which I really don't want to chuck
out.  A reproducible symptom on NetBSD is that the machine completely freezes
up soon after "Making device files ..." toward the end of a fresh install.

Is there a way to test the memory and find the specific address(es) that are
causing trouble?  Then, could I configure the kernel to not use just that
portion?  Or do I just have to experiment with reducing REALEXTMEM (can I do
that?) until problems go away?

henry nelson