On: How modern Linux systems boot

[ajross]

Linux has never needed a ramdisk. If it's built with drivers for the boot device and it probes in an unambiguous manner, you can pass root=/dev/whatever99. That's as true today as it was in 1992.

[checkyoursudo → ajross]

I pass root=PARTUUID=whatever to be safe, but yes this is how I boot an efi stub kernel directly with no rd/initramfs.

Just need to, for example, build the block device driver for the root disk into the kernel instead of a module.