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Bootloader
A bootloader is a fundamental piece of software responsible for initializing a system’s hardware and loading the operating system (OS) or firmware into memory. It acts as a bridge between the system’s power-on process and the execution of the main software.
Key Functions of a Bootloader:
Hardware Initialization – Configures the CPU, memory, and peripherals before the OS or firmware starts.
Firmware/OS Loading – Loads and transfers control to the OS kernel or embedded application.
Security Features – Implements authentication, encryption, and secure boot mechanisms to prevent unauthorized code execution.
Update and Recovery – Allows flashing new firmware or recovering from system failures.
Types of Bootloaders:
First-Stage Bootloader (Primary Bootloader) – A minimal loader stored in ROM or flash memory that initializes essential hardware.
Second-Stage Bootloader (Secondary Bootloader) – A more complex loader that enables advanced features like firmware updates.
Secure Bootloaders – Implement cryptographic verification to ensure only trusted firmware is loaded (e.g., ARM Trusted Firmware, U-Boot with secure boot).
Bootloaders are essential in embedded systems, automotive ECUs, mobile devices, and computers, ensuring reliable and secure system startup.
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