Universal Boot Interface for Secure SoC Initialization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing system-on-chip (SoC) technologies face challenges in securely managing the boot process due to potential compromises in the Root of Trust (RoT) measurement and authentication, particularly exacerbated by manageability issues such as flashless boot and reduced package pad count.
Innovation Solution
The implementation of a universal boot interface (UBI) that disaggregates the fetch process from the security process, enabling secure boot and measured boot capabilities by using a mailbox approach and enforcing a boot policy that requires acknowledgement and approval from the SoC manager and the RoT module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fetch process and security process are combined in a single integrated system, then device complexity is reduced, but security reliability deteriorates due to potential compromise in Root of Trust measurement and authentication
Solution Approach 1:
The patent divides the boot interface into separate fetch logic and security logic components. The fetch logic handles code retrieval while the security logic independently validates Root of Trust measurements and authentication, preventing compromise propagation between functions
Solution Approach 2:
The security verification functions are extracted from the general fetch process and placed in a dedicated security logic module that independently enforces boot policies and validates cryptographic signatures, ensuring security reliability is not compromised by integration
2Manufacturing precision
If flash memory is eliminated for flashless boot, then manufacturing precision and package pad count are improved, but security reliability deteriorates due to challenges in implementing RoT measurement and verification
Solution Approach 1:
The patent introduces an intermediary boot interface structure that mediates between the flashless boot requirement and RoT security requirements. This interface provides standardized measurement and verification points that work with various boot media types including non-flash implementations
Solution Approach 2:
The boot interface is designed with universal measurement and verification capabilities that can operate with different boot media types (flash, flashless, various interconnect standards), making the security implementation independent of specific storage technology
3Adaptability or versatility
If proprietary flows are used for fetching First Mutable Code from boot media, then adaptability to specific hardware is improved, but security reliability deteriorates due to susceptibility to disruption and compromise
Solution Approach 1:
The patent implements a universal boot interface that can fetch code through multiple standardized protocols (SPI, I3C, USB) while maintaining consistent security measurement and verification procedures, achieving both hardware adaptability and security reliability
Data Source
AI summary
Systems and methods herein are for an interface that may be associated with a system-on- chip (SoC) manager and a root of trust (RoT) module and can receive boot media parameters of connected and expected devices. The interface may also initiate First Mutable Code (FMC) fetches which may be loaded to the RoT module and may enforce a boot policy that may require acknowledgement and approval of at least the SoC manager and the RoT module to continue a boot process.