With the T2 chip, Apple had significantly revised the hardware architecture Macs. The “supercontroller” ensured the integrity of the system and governed the start-up sequence, relegating de facto the Intel chip to the rank of a calculation coprocessor. With the abandonment of x86 processors, the architecture of Macs is further modified. While approaching that of the iPhone, it retains specific features that are of interest to the Mac.
Like current machines with a T2 chip, future machines with a System on a Chip (SoC) Apple will integrate a secure boot device. The SoC contains the Boot ROM, an incorruptible memory comprising a small program, responsible for following the same routine at startup:
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