What's really happening before your OS loads — UEFI boot phases, Secure Boot, Measured Boot, and the TPM — explained well enough to debug boot failures, sign your own kernel modules, and understand the modern firmware attack surface.
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BIOS/UEFI Deep Dive: Boot Phases, Secure Boot, Measured Boot, and TPM -
The Linux Boot Process: From Power Button to Login Prompt A thorough walkthrough of how Linux boots — from BIOS/UEFI firmware through the bootloader, kernel initialization, initramfs, systemd, and all the way to a running userspace. Includes debugging techniques for each stage.