The boot sector is really the first stage of the boot loader.

The first boot sector it finds that contains a valid boot record is loaded into RAM and control is then transferred to the code that was loaded from the boot sector. If POST fails, the computer may not be usable and so the boot process does not continue.īIOS POST checks the basic operability of the hardware and then it issues a BIOS interrupt, INT 13H, which locates the boot sectors on any attached bootable devices. POST is the part of BIOS whose task is to ensure that the computer hardware functioned correctly.

When IBM designed the first PC back in 1981, BIOS was designed to initialize the hardware components. When power is first applied to the computer it runs the POST (Power On Self Test) which is part of the BIOS (Basic I/O System). This is the hardware portion of the boot process and is the same for any operating system. The first step of the Linux boot process really has nothing whatever to do with Linux. A reboot will first do a shutdown and then restart the computer. If the computer is already running a local user, including root or an unprivileged user, the user can programmatically initiate the boot sequence by using the GUI or command line to initiate a reboot. First, if power is turned off, turning on the power will begin the boot process. The boot process can be initiated in one of a couple ways. Other software options have been used historically and are still found in some distributions. Note that this article covers GRUB2 and systemd because they are the current boot loader and initialization software for most major distributions. Start systemd, the parent of all processes.Free online course: RHEL Technical Overview.Running Kubernetes on your Raspberry Pi.A practical guide to home automation using open source tools.6 open source tools for staying organized.An introduction to programming with Bash.A guide to building a video game with Python.

Boot img file location