\section{Design Desicions}

\subsection{Howto save the return address of a call}

stack or linkregister

\subsection{howto implement uart, timer, \ldots}

extension module vs. other

\subsection{how does we define cmp on unsigned values}

see note in conditions. there is a difference between x86/amd64/avr and arm.
we will very likely go with arm (or?)
