Summarized the bosboot command (bosboot-AD/dev/hdisk0)

 

Process	Main Function	Sub-function/command	Explanation
Preparations	Valid_dev		Check whether BLV exists on the disk
	Make_workdir		Build a working directory
	Check_diskspace		Check that the/tmp file system has sufficient space to accommodate ramfs and kernel images.
	Init_tmpfile_vars		Set auxiliary environment variables, such as the name of the ramfs file and the name of the proto file.
Build ramfs files, including library files, ODM and other required commands	Create_ramfs	Create_db	Build a streamlined ODM in the working directory
		Strip_lib	Copy required C-library files in the working directory
			Database files are processed by strip to save space
		Build_proto	The most critical step is to build the proto file for mkfs The mkfs command creates a directory in ramfs Based on the proto file and copies the file, such as/sbin/RC. boot and other required commands and kernel extensions, including the ODM and C library files in the working directory
		Check_proto
		Mk_ramfs	Create ramfs and copy files to it
Build boot images, including the operating system kernel and ramfs	Create_bootimage	Compress_ramfs	Create and compress ramfs
		Copy_ker	Copy/Unix kernel to temporary directory
		Mkboot_compresss	Create and compress the kernel Image Based on the/Unix kernel in the temporary directory
		Cat_ker_ramfs	Merge ramfs and kernel Images
		Mkboot_image	Notify Bootstrap BLV location in the disk using the mkboot command
			Dd The merged kernel image to BLV
Copy driver	Copy_device	Savebase	Copy the drivers required by the boot system to BLV

The operating system to be booted must meet the following conditions:
Ü
Bootstrap must know the starting position of the bootable image in the disk
Ü
The bootable image contains the drivers, operating system kernel and library files required to initialize the minimum device, as well as other required commands and ODM.
The bosboot command completes the preceding two tasks.