Limit onboard memory system used

[varda]

Hello Gentlemen.

I have assmbled desktop from the collected spare parts a couple of months back. Then noticed that periodically the system is rebooted several times per week with 'page fault while in kernel mode' message. There is 7.1-RELEASE amd64 on C2D 3.16Ghz and one 2GB memory module. It passes BIOS cheking during POST at full size. I have tested memory myself and found that it broken after 1920MB, i.e. only high 128MB from 2GB.

Therefore a question, is it possible to limit system to use only a lower good part of memory below broken bytes starts?

[mk]

grep memory /boot/defaults/loader.conf

#hw.physmem="1G" # Limit physical memory. See loader(8)
#vm.kmem_size="" # Sets the size of kernel memory (bytes)

from loader(8)

hw.physmem Limit the amount of physical memory the system will use.
By default the size is in bytes, but the k, K, m, M, g and
G suffixes are also accepted and indicate kilobytes,
megabytes and gigabytes respectively. An invalid suffix
will result in the variable being ignored by the kernel.

[varda]

mk, thaks for pointing me to this tip. This is what I exactly needs.