Brief Introduction to Linux kernel initialization process

Article Title: Brief introduction to the Linux kernel initialization process. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
The entire bootstrap process is in four steps.

1: boot PROM phase

2: boot Programs phase

3: kernel initialization phase

4: init phase

System initialization, detects memory and cpu, checks devices and creates device trees, and sets the console

Kernel initialization process

Kernel self-initialization kernel self-check
Loading of kernel modules load the kernel module
Reading of the kernel configuration file in/etc/system read the kernel configuration file
Staring of the/sbin/init process run the/sbin/init process

Bootblk is the main boot program used to load the second boot program ufsboot.
Bootblk is loaded by the boot Sector of the boot device of the PROM.
The ufsboot program uses the kernel genunix and unix
Installboot is used to install bootblk on the disk partition.
Genunix is the platform-independent generic kernel file, while unix is the platform-specific kernel component.

The entire guiding process:

PROM from the boot sector of the boot device --> bookblk --> ufsboot --> genunix (a common Kernel File on an independent platform) and unix (a kernel file on a special platform) --> others