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EFI Boot Guard

A bootloader based on UEFI.

Provides the following functionality:

  • Arm a hardware watchdog prior to loading an OS
  • Provides a simple update mechanism with fail-safe algorithm

In addition, this project provides a UEFI stub and generator tool to create unified kernel images consisting of kernel, command line and, optionally, initrd and device trees.

Development

Mailing list: [email protected]

Archive: https://www.mail-archive.com/[email protected]/

For sending patches, please refer to the mailing list and CONTRIBUTING.md in the source tree.

Continuous integration:

  • GitHub Actions: CI
  • Coverity: [coverity]

Watchdog support

The following watchdog drivers are implemented (and are probed in this order):

  • WDAT (ACPI) watchdog
  • AMD FCH
  • Intel i6300esb
  • Intel Quark
  • Siemens SIMATIC IPC4x7E
  • Siemens SIMATIC BX-56A and BX-59A
  • Intel TCO
  • HPE ProLiant

Note that if no working watchdog is found, the boot process deliberately fails. That said, setting a watchdog timeout of 0 allows to boot nonetheless without a working watchdog, e.g., for testing purposes.

Configuration

efibootguard reads its configuration from an environment storage. Currently, the following environment backends are implemented:

  • Dual FAT Partition storage

See Installation And Usage for further information.

Further Documentation