Answer / sbrahman75

Boot process dived into 4 phases.

1. POST

2. OBPROM

3. KERNEL INITIALIZATION

4. INIT PHASES

POST: Power on self test, It will detect hardware, machine
host ID,serial No, architecture type, memory and Ethernet
address and it will load the primary program called bootblk.

OBP: Open boot programmable,

1.Diagnosing all the system hardware and memory.

2.Initializing the boot parameter.

3.Creating device trees and load the boot block
from (0-15 sector), it is called as

secondary boot programmable ufsboot.

KERNEL

INITIALIZATION: ufsboot load the kernel (generic unix),
kernel will load all the necessary

devices modules to mount the root
partition to continue the booting process.

Init Phase : It will started by executing of /etc/init
program and start other process reading the

/etc/inittab files, as the directory in
the /etc/inittab files. .

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