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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 ($(CTX_INCLUDE_MTE_REGS),1)
endif endif
endif endif
# Trusted Boot is a prerequisite for Measured Boot. It provides trust that the
# code taking the measurements and recording them has not been tampered
# with. This is referred to as the Root of Trust for Measurement.
ifeq ($(MEASURED_BOOT),1) ifeq ($(MEASURED_BOOT),1)
ifneq (${TRUSTED_BOARD_BOOT},1) ifneq (${TRUSTED_BOARD_BOOT},1)
$(error MEASURED_BOOT requires 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. 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 - ``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 This option defaults to 0 and is an experimental feature in the stage of
development. development.