Add SiP service to configure Arm Ethos-N NPU
By default the Arm Ethos-N NPU will boot up in secure mode. In this mode
the non-secure world cannot access the registers needed to use the NPU.
To still allow the non-secure world to use the NPU, a SiP service has
been added that can delegate non-secure access to the registers needed
to use it.
Only the HW_CONFIG for the Arm Juno platform has been updated to include
the device tree for the NPU and the platform currently only loads the
HW_CONFIG in AArch64 builds.
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>
Change-Id: I65dfd864042ed43faae0a259dcf319cbadb5f3d2
diff --git a/docs/plat/arm/arm-build-options.rst b/docs/plat/arm/arm-build-options.rst
index a1d2313..2aa9738 100644
--- a/docs/plat/arm/arm-build-options.rst
+++ b/docs/plat/arm/arm-build-options.rst
@@ -91,6 +91,12 @@
platforms. If this option is specified, then the path to the CryptoCell
SBROM library must be specified via ``CCSBROM_LIB_PATH`` flag.
+- ``ARM_ETHOSN_NPU_DRIVER``: boolean option to enable a SiP service that can
+ configure an Arm Ethos-N NPU. To use this service the target platform's
+ ``HW_CONFIG`` must include the device tree nodes for the NPU. Currently, only
+ the Arm Juno platform has this included in its ``HW_CONFIG`` and the platform
+ only loads the ``HW_CONFIG`` in AArch64 builds. Default is 0.
+
- ``ARM_SPMC_MANIFEST_DTS`` : path to an alternate manifest file used as the
SPMC Core manifest. Valid when ``SPD=spmd`` is selected.
@@ -128,4 +134,4 @@
--------------
-*Copyright (c) 2019-2020, Arm Limited. All rights reserved.*
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*