Have been doing more experimentation regarding this problem. It
doesn't occur with a 1 GB memory module in the machine, nor with a
2 GB module -- only a 4 GB module.
This makes me wonder if there's some sort of memory bank switching
or extended addressing mechanism here (like PAE). Perhaps it's
causing some sort of interrupt every time a certain area of memory
(perhaps the topmost portion) is accessed?
I'd like to experiment with having FreeBSD try to use less than the
full 4 GB (e.g., to make it act as if memory ended at, say, 3 GB)
but I'm not sure how to tell the kernel to do that.
--Brett Glass
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