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Require the TCG2 protocol if system has a TPM #121

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Apr 9, 2024
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Require the TCG2 protocol if system has a TPM #121

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20 changes: 20 additions & 0 deletions source/chapter2-uefi.rst
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Expand Up @@ -22,6 +22,8 @@ in :UEFI:`2.6`.
However, the EBBR target market has a reduced set of requirements,
and so some UEFI features are omitted as unnecessary.

.. _section-required-elems:

Required Elements
-----------------

Expand Down Expand Up @@ -67,6 +69,8 @@ All of the following UEFI elements are required for EBBR compliance.
* - `EFI_DECOMPRESS_PROTOCOL`
- Native EFI decompression is rarely used and therefore not required.

.. _section-required-plat-specific-elems:

Required Platform Specific Elements
-----------------------------------

Expand Down Expand Up @@ -371,6 +375,22 @@ The DTB must be contained in memory of type `EfiACPIReclaimMemory`.
.. [#ACPIMemNote] `EfiACPIReclaimMemory` was chosen to match the recommendation
for ACPI tables which fulfill the same task as the DTB.

UEFI Protocols
==============

Requirements for protocols defined in the UEFI specification are described in
sections :ref:`section-required-elems` and
:ref:`section-required-plat-specific-elems`.

The following sections give additional requirements, for protocols not defined
in the UEFI specification.

Trusted Platform Module (TPM)
-----------------------------

Not all embedded systems include a TPM but if a TPM is present, then firmware
shall implement the `EFI_TCG2_PROTOCOL` as defined in [TCG2]_.

UEFI Boot Services
==================

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4 changes: 4 additions & 0 deletions source/references.rst
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Expand Up @@ -55,3 +55,7 @@ Bibliography
Version 20211203

.. [RVUEFI] `RISC-V UEFI Protocol Specification <https://github.com/riscv-non-isa/riscv-uefi/releases/download/1.0.0/RISCV_UEFI_PROTOCOL-spec.pdf>`_

.. [TCG2] `TCG EFI Protocol Specification, Family “2.0”, Level 00 Revision 00.13.
<https://trustedcomputinggroup.org/wp-content/uploads/EFI-Protocol-Specification-rev13-160330final.pdf>`_
March 2016, `Trusted Computing Group <http://www.trustedcomputinggroup.org/>`_
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