Multiple images

I’m working with on 386ex based custom board and running Neutrino 2.0. I’ve
an idea to put two images into flash:
I mean first bootable image and next image containing optional files and
binaries. I hope when procnto start from bootable image it sees files in
second image, but it doesn’t. I put procnto with option -N to map additional
memory space where I placed second image file system. There is also
attribute ‘chain’ in my build file, but all it doesn’t work.
Anybody have an experience with multiple images or have an idea how it
should work?