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Boot ROM and Secure Boot on Apple Silicon: from power-on to iBoot
What runs in the first microseconds of a Mac boot — the SoC's Boot ROM, the Apple-signed LLB and iBoot stages, the SEP coming up alongside, and how the chain of trust starts.
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How macOS boots: iBoot to launchd
The full chain from power-on to your login window. Boot ROM, iBoot, kernelcache, kernel_init, bsdinit_task, launchd — what each stage does and how control transfers.
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