docs(spm): update ff-a boot protocol documentation
Updated following sections to document implementation of the FF-A boot
information protocol:
- Describing secure partitions.
- Secure Partition Packages.
- Passing boot data to the SP.
Also updated description of the manifest field 'gp-register-num'.
Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I5c856437b60cdf05566dd636a01207c9b9f42e61
diff --git a/docs/components/ffa-manifest-binding.rst b/docs/components/ffa-manifest-binding.rst
index 59996cc..1d8ad0a 100644
--- a/docs/components/ffa-manifest-binding.rst
+++ b/docs/components/ffa-manifest-binding.rst
@@ -137,14 +137,14 @@
- gp-register-num
- value type: <u32>
- - Presence of this field indicates that the partition expects the
- ffa_init_info structure to be passed in via the specified general purpose
- register.
- The field specifies the general purpose register number but not its width.
+ - The field specifies the general purpose register number but not its width.
The width is derived from the partition's execution state, as specified in
the partition properties. For example, if the number value is 1 then the
general-purpose register used will be x1 in AArch64 state and w1 in AArch32
state.
+ Presence of this field indicates that the partition expects the address of
+ the FF-A boot information blob to be passed in the specified general purpose
+ register.
- stream-endpoint-ids
- value type: <prop-encoded-array>