We're heading to SA in October. It's difficult to find a 'compact' source of info but not difficult to find lots of info. We've found blogs by travellers useful so we're gradually building a few that we follow. Try Paul Pitchforks blog HORCA MOTO he's been out there about 18 months on a XT660Z. Also:
Pat Around the Americas: The Route
Blog - A year in the Americas
Also websites rather than blogs include:
Planning your trip | Drive the Americas
Importing a Vehicle - AngloINFO Buenos Aires, in Buenos Aires (Argentina)
For guide books we used the library initially to try out Rough Guides, Lonely Planet etc and overall we found the most useful guide (because it includes good detail on crossing borders by road) to be the Footprint guide to South America (it doesn't just focus on the popular tourist spots). The current 2014 edition is ISBN 978 1 907263 77 4 dated Sep 13 and costs about £25.
For our route, rather than a very specific route, we are compiling a rough route by reading up on the 'must see' routes like the Carretera Austral in Chile and a list of places we really want to see then we'll just make a route up as we go along.
For free opensource satnav mapping go to Free worldwide Garmin maps from OpenStreetMap I've managed to download full mapping for S. America to my Garmin Mapsource software but haven't yet worked out how to put that mapping onto my Garmin Zumo 660 (I'll get to it eventually)
Hope that helps.
May see you in SA sometime in 2015 - good luck.
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