> So which version of gcc supports M0?

codesourcery, AFAIK

> and some of which aren't available as source.

Which one(s)? That would be a GPL license violation!

 > since few of the ARM chips are documented in enough detail
> to actually write your own peripheral drivers.

Which ones? All chips I checked so far are thoroughly documented.

-- 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
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