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A comment on All Chromebooks will also be Linux laptops going forward. Parent comment

Re:All Chromebooks will also be Linux laptops going forward by jdietrich on Thursday May 09, 2019 @01:08PM (#19870070)
Security. By default, Chromebooks use a trusted boot path. The boot sequence starts in ROM and the firmware image is verified during boot. Booting unsigned firmware is possible but slightly inconvenient by design, to ensure that no user would do this accidentally or as a result of malicious actions.

https://www.chromium.org/chromium-os/chromiumos-design-docs/...

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Re:All Chromebooks will also be Linux laptops going forward by djsumdog on Thursday May 09, 2019 @01:24PM (#19870202)
I don't see why this is specific to Chromebooks. On x86_64/UEFI, I can sign my Grub EFI loader, load my keys into secure book (delete the stock/microsoft ones), re-enable secure boot, password it and now I have a reasonable expectation that I am booting the OS I think I am.

It'd be nice if Google opened up their actual bootloader so you could do the same with Chromebooks without needing 3rd party tools.

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