this post was submitted on 10 Jan 2025
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efivars are made read only by the kernel. That firmware bug (!) was worked around in the kernel years ago.
https://github.com/torvalds/linux/blob/master/Documentation/filesystems/efivarfs.rst
Specifically in 2016: https://github.com/torvalds/linux/commit/ed8b0de5a33d2a2557dce7f9429dca8cb5bc5879
uefi is cringe anyway, reject uefi and return to grub in the system firmware
Firmware is one step before.
BIOS, UEFI, coreboot, or whatever weird code runs on a Raspberry Pi's GPU to load your system, those are firmwares.
The firmware is what starts your bootloader; grub, BOOTMGR, u-boot, etc