doc: Clarify cert_create build when USE_TBBR_DEFS=0
The user guide documentation for the cert_create tool needs to
mention that a platform must have a platform_oid.h header file
in order to successfully build the cert_create tool when
USE_TBBR_DEFS is 0.
Change-Id: I77f86a022d207e88a79c97741be3eafbfa0c86f1
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index fe8ce5f..b9f0871 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -1219,11 +1219,13 @@
make PLAT=<platform> [DEBUG=1] [V=1] certtool
For platforms that require their own IDs in certificate files, the generic
-'cert_create' tool can be built with the following command:
+'cert_create' tool can be built with the following command. Note that the target
+platform must define its IDs within a ``platform_oid.h`` header file for the
+build to succeed.
::
- make USE_TBBR_DEFS=0 [DEBUG=1] [V=1] certtool
+ make PLAT=<platform> USE_TBBR_DEFS=0 [DEBUG=1] [V=1] certtool
``DEBUG=1`` builds the tool in debug mode. ``V=1`` makes the build process more
verbose. The following command should be used to obtain help about the tool: