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docs: explain Measured Boot dependency on Trusted Boot

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Change-Id: I04d9439d5967e93896dfdb0f3d7b0aec96c743f9
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
This commit is contained in:
Sandrine Bailleux 2021-06-10 11:18:04 +02:00
parent a5394205e9
commit cc255b9f85
2 changed files with 7 additions and 1 deletions
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3
Makefile
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@ -735,6 +735,9 @@ ifeq ($(CTX_INCLUDE_MTE_REGS),1)
endif
endif
# Trusted Boot is a prerequisite for Measured Boot. It provides trust that the
# code taking the measurements and recording them has not been tampered
# with. This is referred to as the Root of Trust for Measurement.
ifeq ($(MEASURED_BOOT),1)
ifneq (${TRUSTED_BOARD_BOOT},1)
$(error MEASURED_BOOT requires TRUSTED_BOARD_BOOT=1)

5
docs/getting_started/build-options.rst
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@ -463,7 +463,10 @@ Common build options
the build. The default value is 40 in debug builds and 20 in release builds.
- ``MEASURED_BOOT``: Boolean flag to include support for the Measured Boot
feature. If this flag is enabled ``TRUSTED_BOARD_BOOT`` must be set.
feature. If this flag is enabled ``TRUSTED_BOARD_BOOT`` must be set as well
in order to provide trust that the code taking the measurements and recording
them has not been tampered with.
This option defaults to 0 and is an experimental feature in the stage of
development.