Documentation/ABI/testing/sysfs-firmware-efi-esrt

Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-firmware-efi-esrt

File Facts

System
Linux kernel
Corpus path
Documentation/ABI/testing/sysfs-firmware-efi-esrt
Extension
[no extension]
Size
3020 bytes
Lines
88
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: Documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

What:		/sys/firmware/efi/esrt/
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	Provides userland access to read the EFI System Resource Table
		(ESRT), a catalog of firmware for which can be updated with
		the UEFI UpdateCapsule mechanism described in section 7.5 of
		the UEFI Standard.
Users:		fwupdate - https://github.com/rhinstaller/fwupdate

What:		/sys/firmware/efi/esrt/fw_resource_count
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	The number of entries in the ESRT

What:		/sys/firmware/efi/esrt/fw_resource_count_max
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	The maximum number of entries that /could/ be registered
		in the allocation the table is currently in.  This is
		really only useful to the system firmware itself.

What:		/sys/firmware/efi/esrt/fw_resource_version
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	The version of the ESRT structure provided by the firmware.

What:		/sys/firmware/efi/esrt/entries/entry<N>/
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	Each ESRT entry is identified by a GUID, and each gets a
		subdirectory under entries/ .
		example: /sys/firmware/efi/esrt/entries/entry0/

What:		/sys/firmware/efi/esrt/entries/entry<N>/fw_type
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	What kind of firmware entry this is:

		==  ===============
		0   Unknown
		1   System Firmware
		2   Device Firmware
		3   UEFI Driver
		==  ===============

What:		/sys/firmware/efi/esrt/entries/entry<N>/fw_class
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	This is the entry's guid, and will match the directory name.

What:		/sys/firmware/efi/esrt/entries/entry<N>/fw_version
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	The version of the firmware currently installed.  This is a
		32-bit unsigned integer.

What:		/sys/firmware/efi/esrt/entries/entry<N>/lowest_supported_fw_version
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	The lowest version of the firmware that can be installed.

What:		/sys/firmware/efi/esrt/entries/entry<N>/capsule_flags
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	Flags that must be passed to UpdateCapsule()

What:		/sys/firmware/efi/esrt/entries/entry<N>/last_attempt_version
Date:		February 2015
Contact:	Peter Jones <pjones@redhat.com>
Description:	The last firmware version for which an update was attempted.

Annotation

Implementation Notes