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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 wakes the hardware up, trains memory, and loads the first EFI program from the disk. Linux is not running yet.

Arrow keys · R to reset

Tap a stage dot to jump

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