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-rw-r--r--doc/develop/uefi/uefi.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst
index cd84706..e0835be 100644
--- a/doc/develop/uefi/uefi.rst
+++ b/doc/develop/uefi/uefi.rst
@@ -277,6 +277,8 @@ Enable ``CONFIG_OPTEE``, ``CONFIG_CMD_OPTEE_RPMB`` and ``CONFIG_EFI_MM_COMM_TEE`
[1] https://optee.readthedocs.io/en/latest/building/efi_vars/stmm.html
+.. _uefi_capsule_update_ref:
+
Enabling UEFI Capsule Update feature
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -377,6 +379,16 @@ following command::
dfu list
+When the FWU Multi Bank Update feature is enabled on the platform, the
+image index is used only to identify the image index with the image
+GUID. The image index would not correspond to the dfu alt number. This
+is because the FWU feature supports multiple partitions(banks) of
+updatable images, and the actual dfu alt number to which the image is
+to be written to is determined at runtime, based on the value of the
+update bank to which the image is to be written. For more information
+on the FWU Multi Bank Update feature, please refer `doc
+<doc/develop/uefi/fwu_updates.rst>`__.
+
When using the FMP for FIT images, the image index value needs to be
set to 1.