Sure it's British, but ARM's mobile empire is being built through careful alliances rather than conquest. The chip designer's latest deal with Globalfoundries, which mirrors a very similar agreement signed with rival foundry TSMC last month, is a case in point. It's designed to promote the adoption of fast, energy-efficient 20nm processors by making it easy for chip makers (like Samsung, perhaps) to knock on Globalfoundries' door for the grunt work of actually fa