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Full Discussion: Bootloaders question
Top Forums UNIX for Advanced & Expert Users Bootloaders question Post 302996683 by lobsang on Sunday 30th of April 2017 12:05:44 PM
Old 04-30-2017
Wrench Bootloaders question

actually i got the concept of boot loaders : it reside in MBR and its function is to load the root file system of os into memory i.e. to load whole os into memory when system starts.

i have got a list of doubts to clear


Quote:
when installing a fresh OS , does installation process install the boot loaders from that OS into MBR and load the entire OS from cd or dvd into Hard drive and at the same time into memory.

Quote:
what dose it mean by usb boot loader : does that means we are installing Os from a usb drive or it require a special boot loader that loads OS from usb into hard drive.
Quote:
Does boot loader also take part in installing fresh OS.

Quote:
is syslinux a boot loader that installs OS from usb drive that is partitioned with window format. Does that means in that process we have two boot loader : syslinux boot loader loads LINUX OS and then the default OS boot loader loads OS into memory every time we do fresh start.

Last edited by lobsang; 04-30-2017 at 01:11 PM..
 

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BOOTCTL(1)                                                            bootctl                                                           BOOTCTL(1)

NAME
bootctl - Control the firmware and boot manager settings SYNOPSIS
bootctl [OPTIONS...] status bootctl [OPTIONS...] list bootctl [OPTIONS...] update bootctl [OPTIONS...] install bootctl [OPTIONS...] remove DESCRIPTION
bootctl checks, updates, installs or removes the boot loader from the current system. bootctl status checks and prints the currently installed versions of the boot loader binaries and all current EFI boot variables. bootctl list displays all configured boot loader entries. bootctl update updates all installed versions of systemd-boot, if the current version is newer than the version installed in the EFI system partition. This also includes the EFI default/fallback loader at /EFI/BOOT/BOOT*.EFI. A systemd-boot entry in the EFI boot variables is created if there is no current entry. The created entry will be added to the end of the boot order list. bootctl install installs systemd-boot into the EFI system partition. A copy of systemd-boot will be stored as the EFI default/fallback loader at /EFI/BOOT/BOOT*.EFI. A systemd-boot entry in the EFI boot variables is created and added to the top of the boot order list. bootctl remove removes all installed versions of systemd-boot from the EFI system partition, and removes systemd-boot from the EFI boot variables. If no command is passed, status is implied. OPTIONS
The following options are understood: -h, --help Print a short help text and exit. --version Print a short version string and exit. --path= Path to the EFI System Partition (ESP). If not specified, /efi, /boot, and /boot/efi are checked in turn. It is recommended to mount the ESP to /boot, if possible. -p, --print-path This option modifies the behaviour of status. Just print the path to the EFI System Partition (ESP) to standard output and exit. --no-variables Do not touch the EFI boot variables. EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise. SEE ALSO
Boot loader specification[1] systemd boot loader interface[2] NOTES
1. Boot loader specification https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec 2. systemd boot loader interface https://www.freedesktop.org/wiki/Software/systemd/BootLoaderInterface systemd 237 BOOTCTL(1)
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