this post was submitted on 27 Apr 2024
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Pretty sure you can brick your system real quick using efivarfs
https://docs.kernel.org/filesystems/efivarfs.html
some systems dont let you write but some do.
Theres a similar system i was messing with to read and write the firmware code... reading through this may be informative.
efivars should let your change any bios/uefi settings if thats what youre looking for.
Modern versions of Linux don't let you erase it so easily
thank you! I think this is what needed to explore
It is not my level to edit these things, I'm just Linux newbie exploring the possibilities.
But I still can't wrap my head over dd not being able to wipe a storage device out, despite being described as a "low level tool that can write zeroes to targets" in the discussion I viewed online.
The bios isn't like a regular storage device presented to the kernel for mounting.
Dd can’t overwrite a burned cdr either. If the thing you wanna mess with is read only there’s no way to use it as a dd of.
but CD-R aren't rewrite_able because of their physical property not because protected
that's true, but in both cases the ability to write data simply isn't there.