| host arch | arm64 | armhf | armel |
-------------------------------------
| arm64 | X | X | X |
| armhf | | X | X |
| armel | | X | X |
-------------------------------------
Although optional, all existing arm64 silicon supports 32bit instructions.
armel/armhf is only a userspace change, so they are interchangeable.
However armhf isn't supported on all armel platforms (e.g. armv6) but
all those we support have hard-float.