[$] Shrinking the kernel with a hammer

This is the fourth article of a seriesdiscussing various methods of reducing the size of the Linux kernel to make it suitable for smallenvironments. Reducing the kernel binary has its limits and we have pushedthem as far as possible at this point. Still, our goal, which is to be ableto run Linux entirely from the on-chip resources of a microcontroller, hasnot been reached yet. This article will conclude this series by looking atthe problem from the perspective of making the kerneland user space fit into a resource-limited system.