Embedded Linux
  • Cover
  • Summary
  • About This Training
    • Objectives
    • Skills
    • Prerequisites
    • Requirements
  • Once Upon A Time ...
  • Embedded Linux
  • Build Systems
    • Yocto Board Support Package
      • Yocto
      • Compilation
        • Make
        • Bitbake
        • Script
      • Building Blocks
      • SDK
      • Extra Packages
      • Kernel
        • Patch
        • Building
        • Headers
      • Modules
        • Cross Compilation
        • Native
      • Filesystem
      • Flashing
    • Distributions
      • CentOS
      • Google Brillo
      • Jubilinux
      • Kali
      • Ostro
      • Ubilinux
      • Debian
  • Boot Loaders
    • U-Boot
  • Initialization
    • Upgrade
    • Boot Up
    • Dual Boot
    • Root Directory
    • Display Message
    • Modules
    • Filesystem
    • Memory
    • Backup
    • Recovery
    • Reboot
    • Processes
  • User Space
    • Virtual Network Computing
    • Text Editors
    • Services
    • Logs
    • Package Management Systems
      • Open Package Management
      • Python Package Index
      • Nicely Package Make
      • Advanced Packaging Tool
      • Manual
      • Conda
    • Libraries
      • Mraa
      • Upm
      • OpenCv
      • Temboo
      • Libiio
    • Frameworks
      • Cylon JS
      • Johnny Five
      • ROS
      • Gobot
      • Pixhawk
      • Artoo
      • Bower
      • Zetta
      • Miscellaneous
  • Subsystems
    • X File Systems
    • Pin Muxing
    • Virtual File System
    • Memory
    • Input
    • General Purpose Input Output
    • Serial
    • Bluetooth
      • Advanced Audio Distribution Profile
        • Bluez
        • Gstreamer
        • Alsa
      • Human Interface Device Game Controller
      • Serial Port Protocol
      • Arduino
    • WiFi
    • Audio
    • Camera
    • Block
    • Universal Serial Bus
      • Human Interface Device Mini Keyboard
      • Python USB
    • Inter Integrated Circuit
    • Inter Process Communication
    • Peripheral Component Interconnect
    • Clock
    • Modems
    • Networking
    • Power
    • Thermal
    • Graphics
    • LED
    • LIDAR
    • Printer
    • Serial Peripheral Interface
  • Application Development
    • C
    • C++
    • Cross Compile
    • Containers
    • Python
    • NodeJS
    • Cloud9
    • Data
    • Drone Code
    • Speech
      • Python
    • Radio Frequency
    • Bots
    • Artificial Intelligence
      • WitAi
      • MycroftAi
    • Games
    • Vision
      • Bar Codes
      • Google Cloud Vision API
    • Messaging
    • Entertainment
    • Home Assistants
    • Dashboards
    • IRC
    • Location
    • Facial Recognition
    • Software Defined Radio
    • REST
    • Notes
    • Security
    • HAM Radio
    • Automotive
    • Digital Signage
    • Photography
  • Debug
  • Wrap-Up
    • Online Training
    • Challenge
    • Tbd
  • SandBox
Powered by GitBook
On this page

Boot Loaders

PreviousDebianNextU-Boot

Last updated 7 years ago

In computing, booting (or booting up) is the initialization of a computerized system. The system can be a computer or a computer appliance. The booting process can be "hard", e.g., after electrical power to the CPU is switched from off to on (in order to diagnose particular hardware errors), or "soft", when those power-on self-tests (POST) can be avoided. On some systems a soft boot may optionally clear RAM to zero. Both hard and soft booting can be initiated by hardware such as a button press, or by software command. Booting is complete when the normal, operative, runtime environment is attained.

A boot loader is a computer program that loads an operating system or some other system software for the computer after completion of the power-on self-tests; it is the loader for the operating system itself. Within the hard reboot process, it runs after completion of the self-tests, then loads and runs the software. A boot loader is loaded into main memory from persistent memory, such as a hard disk drive or, in some older computers, from a medium such as punched cards, punched tape, or magnetic tape. The boot loader then loads and executes the processes that finalize the boot. Like POST processes, the boot loader code comes from a "hard-wired" and persistent location; if that location is too limited for some reason, that primary boot loader calls a second-stage boot loader or a secondary program loader.

Wikipedia