Booting Process Overview with Linux OS

1. BIOS performs POST.

2.  BIOS selects the boot device, and loads the boosector.

3.  Bootsector loads setup(), decompression routines and the
  compressed kernel image ( arch/i386/boot/bootsect.S )

4.  setup() function. The kernel is uncompressed in protected mode ( arch/386/boot/compressed/{head.S,
  misc.c}

5.  Low-level initialization performed in assembly code.

6.  High-level initialization performed by C code.

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