Libreboot is a distribution of coreboot (without nonfree software), grub and several other packages and their configuration. Libreboot has binaries for specific computers that work without other blobs in their boot firmware flash.
If you install coreboot, you should read its wiki and configuration, you will mostly know what nonfree parts are included (some are in a separate repository; some you need to extract from your computer's BIOS). X201 works with no other nonfree software in boot firmware flash than ME firmware and CPU microcode (there is no nonfree code running on the main CPU). It's not possible to remove/disable ME firmware in a simple way (removing it makes the laptop reboot after 30 minutes). You might have more requirements for a "free computer" than what X60 does.
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