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-rw-r--r--docs/user-guide.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index f8bc4be50..aed54a631 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -573,6 +573,11 @@ Common build options
pages" section in `Firmware Design`_. This flag is disabled by default and
affects all BL images.
+- ``SMCCC_MAJOR_VERSION``: Numeric value that indicates the major version of
+ the SMC Calling Convention that the Trusted Firmware supports. The only two
+ allowed values are 1 and 2, and it defaults to 1. The minor version is
+ determined using this value.
+
- ``SPD``: Choose a Secure Payload Dispatcher component to be built into TF-A.
This build option is only valid if ``ARCH=aarch64``. The value should be
the path to the directory containing the SPD source, relative to