Answer Posted / 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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