I know that mate, no need to get snarky. What I meant is that it was bundled with the core by default, but thanks for the correction. I thought I read it somewhere, but judging by a quick search, it seems I'm mistaken.
Re:iOS 10 Security White Paper [pdf]
by bryanbuckley on Saturday March 25, 2017 @09:35PM
(#13958530)
Depends on the HW manufacturer and SKU on what is bundled or not.. Even ROM code can be different per SKU.
By default no SW runs on HW. "Mobicore" (now called "Kinibi" from Trustonic) is based on L4.