i586 has stayed backwards-compatible (although performance isn't the same if you don't know what you're targeting), ARM hasn't. The raspberry pi's ARMv6 is very

i586 has stayed backwards-compatible (although performance isn't the same if you don't know what you're targeting), ARM hasn't. The raspberry pi's ARMv6 is very different from a Cortex's ARMv7. The kernel also needs patches to know how to initialise an ARM device, and those patches need to be forward-ported.