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The Linux kernel configuration item CONFIG_EFI_BOOTLOADER_CONTROL
:
(none)
efibc
This module installs a reboot hook, such that if reboot() is invoked with a string argument NNN, "NNN" is copied to the "LoaderEntryOneShot" EFI variable, to be read by the bootloader. If the string matches one of the boot labels defined in its configuration, the bootloader will boot once to that label. The "LoaderEntryRebootReason" EFI variable is set with the reboot reason: "reboot" or "shutdown". The bootloader reads this reboot reason and takes particular action according to its policy.
Raw data from LKDDb:
lkddb module efibc CONFIG_EFI_BOOTLOADER_CONTROL : drivers/firmware/efi/Kconfig : "EFI Bootloader Control" # in 4.7–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD
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Automatically generated (in year 2024). See also LKDDb sources on GitLab