linux/Documentation/filesystems/efivarfs.txt
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   2efivarfs - a (U)EFI variable filesystem
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   4The efivarfs filesystem was created to address the shortcomings of
   5using entries in sysfs to maintain EFI variables. The old sysfs EFI
   6variables code only supported variables of up to 1024 bytes. This
   7limitation existed in version 0.99 of the EFI specification, but was
   8removed before any full releases. Since variables can now be larger
   9than a single page, sysfs isn't the best interface for this.
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  11Variables can be created, deleted and modified with the efivarfs
  12filesystem.
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  14efivarfs is typically mounted like this,
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  16        mount -t efivarfs none /sys/firmware/efi/efivars
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