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I use a Custom Filesystem - What Bootloader Solution is right for me?: Difference between revisions
I use a Custom Filesystem - What Bootloader Solution is right for me? (view source)
Revision as of 19:25, 19 January 2010
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Upon completion of its initialization sequence, the BIOS, in order of the priority set in the CMOS, loads a bootloader from the default boot disk. Assume that the HDD is given priority for our example.
So the BIOS loads the first HDD's (or second, or third, or fourth, depending on what you set the boot order to), [[MBR (x86) | Master Boot Record]] into RAM at 0x7C00 and jumps to it, passing the drive number via a register.
The MBR contains code to bootstrap an OS, or a second stage of itself, depending on how considerate the bootloader in question is. GRUB loads its second stage, and displays a menu listing all of the OSs recorded in its configuration file.
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