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Add where to set uefi variables #759

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Oct 16, 2024
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Add where to set uefi variables #759

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11 changes: 9 additions & 2 deletions source/reference-manual/security/secure-boot-uefi.rst
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Expand Up @@ -61,7 +61,7 @@ The most commonly found modes are:
**Standard Mode**

Signature and hash checks are enforced on boot time executables.
Microsoft KEK and DB certificates usually available.
Microsoft KEK and DB certificates are usually available.
System vendors may include their own KEK and/or DB certificates.

**User/Custom Mode**
Expand Down Expand Up @@ -123,7 +123,8 @@ Custom keys can be added to the ``lmp-manifest`` repo directory ``factory-keys/u
Enabling UEFI Secure Boot Usage in LmP
--------------------------------------

The signing process in LmP is controlled by the following Yocto Project variables:
The signing process in LmP is controlled by the following Yocto Project variables,
set in ``meta-subscriber-overrides/conf/machine/include/lmp-factory-custom.inc``:

* ``UEFI_SIGN_KEYDIR``
* Path for the directory containing the DB private key (``DB.key`` and ``DB.crt``),
Expand All @@ -132,6 +133,12 @@ The signing process in LmP is controlled by the following Yocto Project variable
* ``UEFI_SIGN_ENABLE``
* If set to ``1`` the systemd-boot bootloader and Linux kernel binaries will be signed by with the DB key (``DB.key`` at ``UEFI_SIGN_KEYDIR``)


.. tip::

Setting these may not be required in cases where they are inherited from ``meta-lmp-bsp``.
This can be seen in ``meta-lmp/meta-lmp-bsp/conf/machine/include/lmp-machine-custom.inc``

.. _ref-secure-boot-uefi-provisioning:

UEFI Secure Boot Provisioning
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