Not sure if this is useful, but just some articles I bumped into...
Migrating code from ARM to ARM64 https://www.linuxplumbersconf.org/2014/ocw/system/presentations/2343/origina...
ARM64 vs ARM32 -- What's different for Linux programmers http://www.edn.com/design/systems-design/4440662/3/ARM64-vs-ARM32-What-s-dif...
cheers -ben
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