The evaluation of the chain of trust continues on the Intel CPU, with the UEFI firmware evaluating the signature for boot.efi, which is the macOS bootloader. When the Intel CPU first boots, it fetches the UEFI firmware through the eSPI from the integrity-checked, memory-mapped copy of the firmware located on the T2 chip.
APPLE BOOT CAMP INTEL MACS T2WARREN SERIAL
This memory is made available to the Intel CPU through the enhanced Serial Peripheral Interface (eSPI). The UEFI firmware and the associated signature are initially available only to the T2 chip.Īfter verification, the UEFI firmware image is mapped into a portion of the T2 chip memory. iBoot checks the kernel and kernel extension code on the T2 chip, which then checks the Intel UEFI firmware. This verifies the iBoot bootloader and is the first step in the chain of trust. When an Intel-based Mac computer with the Apple T2 Security Chip is turned on, the chip performs a secure boot from its Boot ROM in the same fashion as iPhone, iPad, and a Mac with Apple silicon. Intel-based Mac with an Apple T2 Security Chip
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Contents of a LocalPolicy file for a Mac with Apple silicon.LocalPolicy signing-key creation and management.Boot process for iOS and iPadOS devices.Secure intent and connections to the Secure Enclave.Face ID, Touch ID, passcodes, and passwords.