What's the difference between armv6 and armv7?

[Jonathan Chen]

Hi,

Sorry if this sounds like a simple question, but what is the
difference between armv6 and armv7 TARGET_ARCH? I had opportunity to
try out both for STABLE-12 the past few days, and the resultant kernel
and binaries both work for the RPI2. The file(1) output doesn't appear
to offer any distinguishing features either:

rpi2:~,6:35am> file /usr/bin/true
/usr/bin/true: ELF 32-bit LSB executable, ARM, EABI5 version 1
(FreeBSD), dynamically linked, interpreter /libexec/ld-elf.so.1, for
FreeBSD 12.0 (1200500), FreeBSD-style, stripped

Thanks
-- 
Jonathan Chen <jonc at chen.org.nz>