[PATCH v4 07/12] doc: Add documentation to highlight capsule generation related updates

[Sughosh Ganu]

The UEFI capsule can now be generate by specifying the capsule
parameters through a config file. Additionally, the capsules can be
generated as part of u-boot build, through binman. Highlight these
changes in the documentation.

Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
---
Changes since V3:
* Move the paragraph on version support under a separate subsection.
* Move the description on generating capsules through config file
  under the section to describe capsule generation.
* Add a subsection highlighting generation of capsules through
  binman.

 doc/develop/uefi/uefi.rst | 84 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst
index 3d07aa33b8..251eaa13fd 100644
--- a/doc/develop/uefi/uefi.rst
+++ b/doc/develop/uefi/uefi.rst
@@ -318,6 +318,79 @@ Run the following command
       --guid <image GUID> \
       <capsule_file_name>
 
+Alternatively, the capsules can be generated through a config
+file. When generating the capsules through a config file, the Kconfig
+symbol CONFIG_EFI_CAPSULE_CFG_FILE is to be used for specifying the
+path to the config file.
+
+The config file describes the parameters that are used for generating
+one or more capsules. The parameters for a given capsule file are
+specified within curly braces, in the form of "key:value" pairs. All
+the parameters that are currently supported by the mkeficapsule tool
+can be specified through the config file.
+
+The following are some example payload parameters specified through
+the config file.
+
+.. code-block:: none
+
+	{
+	    image-guid: 02f4d760-cfd5-43bd-8e2d-a42acb33c660
+	    hardware-instance: 0
+	    monotonic-count: 1
+	    payload: u-boot.bin
+	    image-index: 1
+	    fw-version: 2
+	    private-key: /path/to/priv/key
+	    pub-key-cert: /path/to/pub/key
+	    capsule: u-boot.capsule
+	}
+	{
+	    image-guid: 4ce292da-1dd8-428d-a1c2-77743ef8b96e
+	    hardware-instance: 0
+	    payload: u-boot.itb
+	    image-index: 2
+	    fw-version: 7
+	    oemflags: 0x8000
+	    capsule: fit.capsule
+	}
+	{
+	    capsule-type: accept
+	    image-guid: 4ce292da-1dd8-428d-a1c2-77743ef8b96e
+	    capsule: accept.capsule
+	}
+	{
+	    capsule-type: revert
+	    capsule: revert.capsule
+	}
+
+The following are the keys that specify the capsule parameters
+
+..code-block:: none
+
+    image-guid: Image GUID
+    image-index: Image index value
+    fw-version: Image version
+    private-key: Path to the private key file used for capsule signing
+    pub-key-cert: Path to the public key crt file used for capsule signing
+    payload: Path to the capsule payload file
+    capsule: Path to the output capsule file that is generated
+    hardware-instance: Hardware Instance value
+    monotonic-count: Monotonic count value
+    capsule-type: Specifies capsule type. normal(default), accept or revert
+    oemflags: 16bit Oemflags value to be used(populated in capsule header)
+
+When generating capsules through a config file, the command would look
+like
+
+.. code-block:: console
+
+    $ mkeficapsule --cfg-file </path/to/the/config/file>
+
+
+Capsule with firmware version
+*****************************
+
 The UEFI specification does not define the firmware versioning mechanism.
 EDK II reference implementation inserts the FMP Payload Header right before
 the payload. It coutains the fw_version and lowest supported version,
@@ -345,6 +418,17 @@ add --fw-version option in mkeficapsule tool.
 If the --fw-version option is not set, FMP Payload Header is not inserted
 and fw_version is set as 0.
 
+
+Capsule Generation through binman
+*********************************
+
+Support has also been added to generate capsules during u-boot build
+through binman. This requires the platform's DTB to be populated with
+the capsule entry nodes for binman. The capsules then can be generated
+by specifying the capsule parameters either through a config file, or
+by specifying them as properties in the capsule entry node.
+
+
 Performing the update
 *********************
 
-- 
2.34.1