This [http://140.116.72.245/~q36991217/allenli/wp-content/uploads/omap/TTO_Linux_SOC_Workshop_Student_Notes_v3.08.pdf link] points to a document writtend by Texas Instruments for a student workshop. Even if it addresses Texas Instruments processors, it provides a lot of useful information that are platform-independent.
=== Embedded distributions ===
[[File: Embedded linux distros.png]]