I believe this is a new white paper (or at least revised) from Cisco, on their HW/FW security technologies:
Trustworthy solutions encompass Cisco’s commitment to deliver products and solutions with multilayered security that protect against today’s threats. Trustworthy technologies provide a foundation of security and resilience across Cisco’s solutions portfolio. Trustworthy technologies such as image signing, secure boot, Cisco Trust Anchor module (TAm), and runtime defenses help ensure that the code running on Cisco hardware platforms is authentic, unmodified, and operating as intended. A hardware-level root of trust, unique device identity, and validation of all levels of software during startup establish a chain of trust for the system.
Firmware Security 