A rather comprehensive document on ARM Cortex-A processor architecture. While you may use the Cortex M series, there's still plenty of useful information to be found.
http://lnkd.in/xuf6db
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If you are starting to develop on the ARM Cortex Applications Processors, or if you are looking for more tricks, the ARM Technical Publication team recently issued the ARM Cortex-A Programmer's Guide.
The tone chosen is lighter than the usual ARM documentation and the team would be interested in your feedback. You can either post here or reply privately. I can anonymously forward in both cases, if needed.
You can get this document at http://bit.ly/CortexAProg
ARM has put it behind a click-through license and you would therefore need to login to http://www.ARM.com. However, this is the same login for downloads, forums, blog comments, support cases... So it's not for single use!