Käynnistysjaksoja

Käynnistysjaksoja refers to the boot sequence or boot process of a computer system. It is the series of operations that a computer performs when it is turned on, from the initial power-up to the point where the operating system is ready for user interaction.

The process typically begins with the Power-On Self-Test (POST), a hardware check performed by the system's firmware (BIOS or UEFI). POST verifies that essential hardware components like the CPU, RAM, and graphics card are functioning correctly. Following POST, the system firmware locates and loads the boot loader, a small program responsible for initializing the operating system.

The boot loader then loads the operating system kernel into memory and transfers control to it. The kernel initializes various system services, drivers, and processes. This includes setting up memory management, scheduling tasks, and mounting file systems. Finally, the graphical user interface or command-line interface is displayed, indicating that the boot sequence is complete and the system is ready for use. The specific steps and components involved can vary depending on the operating system and hardware architecture.