Embedded systems programming has been a passion of mine for a couple of years now. I really enjoy bringing a processor online and making it dance to the beat of my drum. Over the past few days I have taken an interest in writing my own linker scripts, start code and a CRT0 (C Runtime). In this article I will give you some background as to why this is important. I will guide you through the steps that I have taken to bring an ARM processor from reset to main() and beyond.