A year or two back Apple was apparently working on porting the Mac OS X Darwin kernel to the family of chipsets that also powers the iPhone and iPad. Apple’s Platform Technologies Group, which is a division of the CoreOS department, handled the project called Porting Darwin to the MV88F6281, subtitled ARMing the Snow Leopard.
via Apple Looking at Mac OS X iPad, or MacBook Air on ARM? | ITProPortal.com.
