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linux-boot-system-documentation's Introduction

linux-boot-system-documentation


Linux Boot Process Sequence

  1. Click Power Button to start
  2. CPU works
  3. BIOS/UEFI
    • Perform POST (Power On Self Test)
    • Check for bootable device
  4. MBR
    • Load the boot loader (446 byte) into the memory
  5. GRUB
    • Load boot/grab/grab.cfg
    • GUI asking OS
    • Select Kernel
    • Load to RAM
  6. Kernel
    • Load the driver from temp.system
    • Initialized the first process init/systemD
  7. SystemD
    • Start all require process
    • To bring system to run_level/targets

Info

  • CPU: Central Processing Unit
  • BIOS: Basic I/O (Input-Output) System
  • UEFI: Unified Extensible Firmware Interface
  • MBR: Master Boot Record
  • GRUB: GRand Unified Bootloader
  • GUI: Graphical User Interface
  • SystemD: System Daemons

Author: Mahfuz Hasan Reza

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