swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
- v5.9-rc8
- v5.9-rc7
- v5.9-rc6
- v5.9-rc5
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- v5.2
- v5.15-rc3
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- v5.14
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- v5.12
- v5.11-rc7
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- v5.11
- v5.10-rc7
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- v5.10-rc5
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- v5.10-rc1
- v5.10
- v5.1-rc7
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- v5.1-rc2
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- v5.1
- v5.0-rc8
- v5.0-rc7
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- v5.0-rc5
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- v5.0
- v4.9-rc8
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- v4.9
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- v4.7
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- v4.3
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- v4.16
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- v4.14-rc8
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- v4.14-rc5
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- v4.14
- v4.13-rc7
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- v4.13-rc2
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- v4.13
- v4.12-rc7
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- v4.11-rc8
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- v4.11
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- v4.1-rc8
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- v4.1
- v4.0-rc7
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- v4.0
- v3.9-rc8
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- v3.9
- v3.8-rc7
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- v3.5-rc7
- v3.5-rc6
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- v3.5-rc2
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- v3.4-rc7
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- v3.4-rc5
- v3.4-rc4
- v3.4-rc3
- v3.4-rc2
- v3.4-rc1
- v3.4
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- v3.3-rc6
- v3.3-rc5
- v3.3-rc4
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- v3.3-rc2
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- v3.3
- v3.2-rc7
- v3.2-rc6
- v3.2-rc5
- v3.2-rc4
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- v3.2-rc2
- v3.2-rc1
- v3.2
- v3.19-rc7
- v3.19-rc6
- v3.19-rc5
- v3.19-rc4
- v3.19-rc3
- v3.19-rc2
- v3.19-rc1
- v3.19
- v3.18-rc7
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- v3.18
- v3.17-rc7
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- v3.15-rc8
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- v3.14-rc8
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- v3.14-rc6
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- v3.14
- v3.13-rc8
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- v3.13
- v3.12-rc7
- v3.12-rc6
- v3.12-rc5
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- v3.12
- v3.11-rc7
- v3.11-rc6
- v3.11-rc5
- v3.11-rc4
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- v3.11-rc1
- v3.11
- v3.10-rc7
- v3.10-rc6
- v3.10-rc5
- v3.10-rc4
- v3.10-rc3
- v3.10-rc2
- v3.10-rc1
- v3.10
- v3.1-rc9
- v3.1-rc8
- v3.1-rc7
- v3.1-rc6
- v3.1-rc5
- v3.1-rc4
- v3.1-rc3
- v3.1-rc2
- v3.1-rc10
- v3.1-rc1
- v3.1
- v3.0-rc7
- v3.0-rc6
- v3.0-rc5
- v3.0-rc4
- v3.0-rc3
- v3.0-rc2
- v3.0-rc1
- v3.0
- v2.6.39-rc7
- v2.6.39-rc6
- v2.6.39-rc5
- v2.6.39-rc4
- v2.6.39-rc3
- v2.6.39-rc2
- v2.6.39-rc1
- v2.6.39
- v2.6.38-rc8
- v2.6.38-rc7
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- v2.6.38
- v2.6.37-rc8
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- v2.6.37
- v2.6.36-rc8
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- v2.6.36
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- v2.6.35
- v2.6.34-rc7
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- v2.6.34
- v2.6.33-rc8
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- v2.6.33-rc1
- v2.6.33
- v2.6.32-rc8
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- v2.6.32
- v2.6.31-rc9
- v2.6.31-rc8
- v2.6.31-rc7
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- v2.6.31-rc1
- v2.6.31
- v2.6.30-rc8
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- v2.6.30-rc2
- v2.6.30-rc1
- v2.6.30
- v2.6.29-rc8
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- v2.6.29-rc1
- v2.6.29
- v2.6.28-rc9
- v2.6.28-rc8
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- v2.6.28
- v2.6.27-rc9
- v2.6.27-rc8
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- v2.6.27-rc1
- v2.6.27
- v2.6.26-rc9
- v2.6.26-rc8
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- v2.6.26-rc2
- v2.6.26-rc1
- v2.6.26
- v2.6.25-rc9
- v2.6.25-rc8
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- v2.6.25
- v2.6.24-rc8
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- v2.6.24-rc1
- v2.6.24
- v2.6.23-rc9
- v2.6.23-rc8
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- v2.6.23
- v2.6.22-rc7
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- v2.6.22-rc5
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- v2.6.21
- v2.6.20-rc7
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- v2.6.20
- v2.6.19-rc6
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- v2.6.19
- v2.6.18-rc7
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- v2.6.18
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- v2.6.17-rc1
- v2.6.17
- v2.6.16-rc6
- v2.6.16-rc5
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- v2.6.16-rc2
- v2.6.16-rc1
- v2.6.16
- v2.6.15-rc7
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- v2.6.15-rc5
- v2.6.15-rc4
- v2.6.15-rc3
- v2.6.15-rc2
- v2.6.15-rc1
- v2.6.15
- v2.6.14-rc5
- v2.6.14-rc4
- v2.6.14-rc3
- v2.6.14-rc2
- v2.6.14-rc1
- v2.6.14
- v2.6.13-rc7
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- v2.6.13-rc5
- v2.6.13-rc4
- v2.6.13-rc3
- v2.6.13-rc2
- v2.6.13-rc1
- v2.6.13
- v2.6.12-rc6
- v2.6.12-rc5
- v2.6.12-rc4
- v2.6.12-rc3
- v2.6.12-rc2
- v2.6.12
- v2.6.11-tree
Permalinks
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Tip revision: a55aa89aab90fae7c815b0551b07be37db359d76 authored by Linus Torvalds on 25 August 2019, 19:01:23 UTC
Linux 5.3-rc6
Linux 5.3-rc6
Tip revision: a55aa89
efivarfs.txt
efivarfs - a (U)EFI variable filesystem
The efivarfs filesystem was created to address the shortcomings of
using entries in sysfs to maintain EFI variables. The old sysfs EFI
variables code only supported variables of up to 1024 bytes. This
limitation existed in version 0.99 of the EFI specification, but was
removed before any full releases. Since variables can now be larger
than a single page, sysfs isn't the best interface for this.
Variables can be created, deleted and modified with the efivarfs
filesystem.
efivarfs is typically mounted like this,
mount -t efivarfs none /sys/firmware/efi/efivars
Due to the presence of numerous firmware bugs where removing non-standard
UEFI variables causes the system firmware to fail to POST, efivarfs
files that are not well-known standardized variables are created
as immutable files. This doesn't prevent removal - "chattr -i" will work -
but it does prevent this kind of failure from being accomplished
accidentally.