This is erroneous. Depends on OS. NO current Raspbian uses or supports 64 bit code. Also depends on whether ARM6 or ARM7 code is generated. Virtually all Raspbian apps are compiled for ARM6.
– MilliwaysMay 24 '19 at 00:47
@Milliways it has no dependency on any OS at all. The same is true if you run bare metal. BCM2835 code runs anywhere, BCM2836 code (original RPi2B) runs on 2B or 3B. BCM2837 code runs on model 3 (and some later model 2Bs).
– DougieMay 24 '19 at 16:51