Answer Posted / deepak
Boot PROM
1. The PROM displays system identification information and
then runs self-test diagnostics to verify the system's
hardware and memory.
2. Then, the PROM loads the primary boot program, bootblk,
whose purpose is to load the secondary boot program (that
is located in the ufs file system) from the default boot
device.
Boot Programs
3. The bootblk program finds and executes the secondary
boot program, ufsboot, and loads it into memory.
4. After the ufsboot program is loaded, the ufsboot
program loads the kernel.
Kernel Initialization
5. The kernel initializes itself and begins loading
modules by using ufsboot to read the files. When the kernel
has loaded enough modules to mount the root (/) file
system, the kernel unmaps the ufsboot program and
continues, using its own resources.
6. The kernel creates a user process and starts
the /sbin/init process, which starts other processes by
reading the /etc/inittab file.
init
7. The /sbin/init process starts the run control (rc)
scripts, which execute a series of other scripts. These
scripts (/sbin/rc*) check and mount file systems, start
various processes, and perform system maintenance tasks.
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