./cst --sign-debug-challenge --challenge 0xABCD1234... --key srk1_4096.pem --out response.bin
He pulled up the specific register view mentioned in the User Guide’s appendix. "The QorIQ Trust Architecture 2.1 uses technology integrated with the NXP Peripheral Access Controller (PAC). The keys aren't in 'normal' RAM. They are in the Secure World." qoriq trust architecture 2.1 user guide
QorIQ Trust Architecture 2.1 is a sophisticated security framework designed by NXP (formerly Freescale) to enable the development of "Trusted Platforms"—systems that resist both remote and physical attacks. While many technical resources refer to it, the comprehensive Trust Architecture User Guide is typically not public and is often provided only under a Non-Disclosure Agreement (NDA) NXP Community Core Objectives qoriq trust architecture 2.1 user guide