The 32-bit subset of ARMv8 is (supposedly) better specified at the system level than ARMv7 (ie, by the v8 architecture itself).
There are some cores that do just the 32-bit subset of v8, but apparently Cortex-A53 will do 64 as well, which I hadn't realised from the Rpi3 announcement I saw. On 3 March 2016 at 15:37, Richard Miller <9f...@hamnavoe.com> wrote: > >> cpu0: 1200MHz ARM Cortex-A53 r0p4 > > > > it's ARMv8-A! > > When booted in 32-bit mode, it behaves like armv7a. > > >