e2e42056fd
Add support for using a fallback boot entry in case of UEFI firmware capsule update failure [1]. The status of a firmware update is obtained from the EFI System Resource Table (ESRT), which provides an optional mechanism for identifying device and system firmware resources for the purposes of targeting firmware updates to those resources. Current implementation uses the value of LastAttemptStatus field from ESRT, which describes the result of the last firmware update attempt for the firmware resource entry. The field is updated each time an UpdateCapsule() is attempted for an ESRT entry and is preserved across reboots (non-volatile). This can be be used in setups with support for A/B OTA updates, where the boot firmware and Linux/RootFS are updated synchronously. The check is activated by adding "fallback-firmware-failure" to loader.conf [1] https://uefi.org/specs/UEFI/2.10/23_Firmware_Update_and_Reporting.html Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
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