Demystifying the Secure Enclave Processor
LytVKz
LytVKz
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SEP Initialization – Second Stage<br />
• Listens for messages in <strong>the</strong> mailbox.<br />
• 8-byte messages that have <strong>the</strong> same format<br />
SEPOS uses.<br />
• All messages use endpoint 255<br />
(EP_BOOTSTRAP)<br />
Opcode<br />
Description<br />
1, 2 “Status check” (Ping)<br />
3 Generate nonce<br />
4 Get nonce word<br />
5 “BootTZ0” (Continue boot)