Excuse my ignorance vs. i386 details...

I have a machine (dual amd64) with 4 GB ram. I'm trying to install NetBSD/i386
on it (currently NetBSD/amd64 is installed but has ... a few problems).

When booting the kernel says

  WARNING: skipping large memory map entry: 0x100000000/0x400000000/0x1

(from add_mem_cluster() in i386/machdep.c)

I don't want my memory skipped ;-)
Why is this done? Can I dump the memory map?

Thanks for hints,

Martin