ARM vm limitations ?

Hi, I'd like to play around with pharo on ARM devices (like a
HummingBoard, the ones from ODROID or one of the beagleboards). But I am
not sure if I have to take care of the ARM architecture version (ARMv6 /
ARMv7 / ARMv8) when choosing my toy.

I found this vm:
http://files.pharo.org/vm/pharo-spur32/linux/armv6/
Is it only for armv6 like the folder name says or is ARMv7 and ARMv8
working too?

Are there any limitations I should know before choosing a ARM device?

Is there a vm for 64bit (aarch64)?

Thanks!
Albrecht