Alkukäynnistys

Alkukäynnistys refers to the initial startup sequence of a computer system. When a computer is powered on, it undergoes a series of steps to become operational. This process typically begins with the Power-On Self-Test (POST), a diagnostic check performed by the BIOS (Basic Input/Output System) or UEFI (Unified Extensible Firmware Interface) to verify that essential hardware components like the CPU, RAM, and graphics card are functioning correctly. If POST is successful, the system then proceeds to locate and load the operating system's bootloader from a designated storage device, such as a hard drive or solid-state drive.

The bootloader is a small program responsible for loading the main operating system kernel into memory. Once the kernel is loaded, it takes control of the system and initializes various drivers and services necessary for the operating system to run. This includes setting up memory management, process scheduling, and device communication. Following the kernel initialization, the operating system begins to start user-level applications and the graphical user interface, if applicable, culminating in the system being ready for user interaction. The entire alkukäynnistys sequence is crucial for ensuring a stable and functional computing environment.