Understanding the Linux startup process

Step 5: The Startup Process

At this point, systemd manages the user space and brings the system up to an operational state. For example, it mounts filesystems and starts other services [4].

UEFI-Based Booting

For UEFI-based systems (Figure 3), the five steps include the UEFI POST, booting with ESP, UEFI Secure Boot, the bootloader phase, and the kernel phase.

Figure 3: The UEFI booting sequence.

Step 1: The UEFI POST

The UEFI firmware of the system does a POST and then finds peripheral devices and the hard disk and sets them up [5].

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