Search notes:

drivers/firmware/efi/libstub/efi-stub-helper.c

drivers/firmware/efi/libstub/efi-stub-helper.c contains * Helper functions used by the EFI stub on multiple architectures*.

efi_parse_options

efi_parse_options parses the command line for options related to booting with EFI.
The format of recognized options is
[nokaslr][quiet][efi=…][video=efifb:…]
The following values can be used in comma separated for for efi= options (for example efi=nochunk,nosoftreserve)

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