BONE = mainline (am335x (SMP disabled))
BONE-RT = mainline + Real TIme Patchset (am335x (SMP disabled))
TI = TI LTS Release (am335x + am57xx (SMP enabled))
TI-RT = TI LTS Release + Real Time Patchset (am335x + am57xx (SMP enabled))
On a single core system, it’s mostly overhead… BUT you need SMP enabled with you want one image to work on both the AM335x (single core) and AM57xx (dual core)…