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How does GRUB load the kernel?
Generally, GRUB can boot any Multiboot-compliant OS in the following steps:
- Set GRUB’s root device to the drive where the OS images are stored by the command @command{root} (see section root).
- Load the kernel image by the command @command{kernel} (see section kernel).
Which partition should GRUB be installed on?
GRUB (some of it) is installed in the MBR. The MBR are the first 512 bytes on a disk. The MBR is also used by the partition table of the disk, therefore GRUB itself has somewhat less space than the 512 bytes.
How does Grub load the Linux kernel into memory?
GRUB will check it’s configs for the location of the requested kernel and attempt to load (or strap) that image into memory. Once loaded, GRUB will pass parameters (if any) and transfer control to the kernel. The kernel will then load both the default configuration file and any other modules needed.
Where does Grub get installed on a partition?
Whenever you install GRUB, on any of your partition, it gets installed and images are put under the directory “boot” in that partition. If you want to install grub, under a directory other than the default “boot”, you need to specify the boot directory with a command line argument to grub-install command.
How do I boot an operating system from Grub?
Booting an operating system from grub command line is quite simple. You just need to specify the partition where your kernel and initrd images are present before entering the boot command. press “c” when you are in grub menu selection area. You will be presented with a grub> grub console, as shown below.
Why does Grub say where is the OS?
“Where’s the OS?” one might demand. But don’t fret, this may not be the end. There are a number of reasons you could be getting this prompt, but it usually all boils down to the fact that GRUB is unable to see any information on how it should load your kernel and operating system.