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What is the detail boot process in linux? Start form Pc
on..?
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Answer Posted / vipin kumar
first start from the power on .
1-processor start and tranfer the control to bios
basic i/p output function ,it will perform the post test
post is power on self test .it check all the hardware attached
with the help of id keyoboard id is 1.so it will first check
keyboard first.
2-then bios load into the memory whatever program is
residing in the first sector of the mbr.
mbr is 512 bytes in size.(master boot record)
mbr then load the first stage of bootloader its all job to
load 2nd stage bootloader into the memory.
3-when 2nd stage bootloader will load into the memory you
will see a red screen where you will see operating system
entry like redhat server rhel5.4 and other os like others.
4-2nd stage bootloader will determine which kernal is to
load ,then it will load corresponding kernal binary into the
memory.
kernal will load the initial ram disk image into the memory
called initrd in to the memory.
initrd load the basic driver to start the os.
once initrd load it transfer the control to the kernal .
5- when kernal load into the memory it configure all
hardware attached to it. and in order to setup user
environment it start init program.
6-init is the first program and it is also called the parent
of all the program .
it start /etc/rc.d/rc.sysinit to set the user environment.
start swap and check file system.
this is the last stage.
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