Meaning
Power-on initialization sequence that clears all volatile memory and forces the hardware to load its configuration from non-volatile storage. A cold boot reset ensures that the system starts from a known and clean state every time electricity is first applied. This process differs from a warm reset because it involves a full hardware power cycle.
Memory Clearing
Random access memory contains garbage data when power is first applied. During a cold boot reset, the startup code overwrites the entire memory space with zeros or predefined values to prevent the application from reading old or corrupted information. This step is necessary to ensure the integrity of the software execution.
Sequence Timing
Hardware must wait for the power supply to stabilize before the processor begins to execute instructions. A cold boot reset includes a power-on delay that holds the system in a reset state until the voltage reaches the required level. If the power rises too slowly, the system may fail to start correctly.
Peripheral Startup
External components like sensors and radios need time to initialize their internal state machines. The cold boot reset routine includes specific delays to allow these devices to complete their self-tests before the main application attempts to communicate with them. Each peripheral is configured according to the golden register map to ensure consistent behavior.
This orderly startup prevents bus conflicts and ensures that the entire system is ready for operation within the required time window. The bootloader also checks the integrity of the application code before handing over control to the main program. Any failure during this phase results in a system halt or an error message to the diagnostic port.
