Section 27 of 101
26. Power-On and Restart Sequence
Stable section ID: S05-CON-006-SECTION-27 · 26 content blocks
The Power-On and Restart Sequence shall initialize the BIOS without unexpectedly activating physical equipment.
The general sequence shall be:
Power Stabilization Verify that the BIOS power source is within acceptable voltage, frequency, and quality limits.
Processor and Memory Initialization Initialize the BIOS computing platform and verify basic hardware availability.
Hardware Root-of-Trust Initialization Activate protected identity, cryptographic, and integrity-verification functions.
Secure Boot Verification Verify each authorized software stage before execution.
Persistent Storage Mounting Access configuration and recovery records in read-only or protected mode until integrity is confirmed.
Core Self-Test Test processor, memory, storage, time source, watchdog, network interfaces, and essential security functions.
Configuration Selection Identify the most recent complete, authorized, and internally consistent configuration baseline.
Core Service Initialization Start identity, storage, time, state, event, policy, and service-management functions.
Communication Initialization Activate required local communication networks in a non-commanding discovery condition.
Physical-System Observation Read available component and Interface states without assuming control authority.
Discovery and Identity Verification Identify currently present components and compare them with the approved configuration.
- Topology and Dependency Reconstruction Re-establish known physical and logical relationships.
- Configuration and State Reconciliation Compare stored, observed, and requested configurations.
- Controlled Service Activation Activate services in dependency and criticality order.
Operational Authorization Permit higher-level systems to operate only after the required boot conditions are satisfied.
A software restart shall not unnecessarily interrupt independent physical safety systems.
A restart request shall identify whether it affects:
a single BIOS service;
one BIOS node;
a building zone;
the complete BIOS;
connected equipment;
higher-level systems.
Unexpected restart shall generate an event containing the apparent cause, preceding health state, incomplete transactions, and recovery result.