← Back to Labs

Linux Boot Ownership Timeline

Step through which layer owns the machine from power-on to PID 1 and watch the corresponding boot log line change.

ownership of the machine during bootFirmwareUEFIBootloaderGRUB / shimKernel Early BootLinux kernelInitramfsEarly userspaceswitch_rootHandoffPID 1 and Targetssystemd[fw] BootOrder=0003, Secure Boot policy validated, loading EFI binary
Step 1 / 6Firmware

Firmware initializes the CPU, memory, and buses, then selects the first EFI program to run. Linux is not running yet.

Arrow keys · R to reset

Tap a stage dot to jump

Read the full article →Take the quiz →