docs(ethos-n): update porting-guide.rst for NPU
Add some missing configuration that must be done for supporting NPU on
other platforms.
Signed-off-by: Rob Hughes <robert.hughes@arm.com>
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>
Change-Id: Ic505ea60f73b970d0d7ded101830eb2ce8c7ab64
diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index 1a4b107..ae3ffb5 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -574,8 +574,15 @@
PLAT_PARTITION_BLOCK_SIZE := 4096
$(eval $(call add_define,PLAT_PARTITION_BLOCK_SIZE))
+If the platform port uses the Arm® Ethos™-N NPU driver, the following
+configuration must be performed:
+
+- The NPU SiP service handler must be hooked up. This consists of both the
+ initial setup (``ethosn_smc_setup``) and the handler itself
+ (``ethosn_smc_handler``)
+
If the platform port uses the Arm® Ethos™-N NPU driver with TZMP1 support
-enabled, the following constants must also be defined.
+enabled, the following constants and configuration must also be defined:
- **ARM_ETHOSN_NPU_PROT_FW_NSAID**
@@ -604,7 +611,18 @@
- **ARM_ETHOSN_NPU_FW_IMAGE_BASE** and **ARM_ETHOSN_NPU_FW_IMAGE_LIMIT**
+ Defines the physical address range that the NPU's firmware will be loaded
+ into and executed from.
+
-- Provide FCONF entries to configure the image source for NPU firmware (and certificates).
+- Configure the platforms TrustZone Controller (TZC) with appropriate regions
+ of protected memory. At minimum this must include a region for the NPU's
+ firmware code and a region for protected inference data, and these must be
+ accessible using the NSAIDs defined above.
+
+- Include the NPU firmware and certificates in the FIP.
+
+- Provide FCONF entries to configure the image source for the NPU firmware
+ and certificates.
- Add MMU mappings such that:
@@ -612,7 +630,8 @@
``ARM_ETHOSN_NPU_FW_IMAGE_BASE`` and ``ARM_ETHOSN_NPU_FW_IMAGE_LIMIT``
- BL31 (SiP service) can read the NPU firmware from the same region
-- Add the firmware image ID ``ARM_ETHOSN_NPU_FW_IMAGE_ID`` to the list of images loaded by BL2
+- Add the firmware image ID ``ARM_ETHOSN_NPU_FW_IMAGE_ID`` to the list of images
+ loaded by BL2.
Please see the reference implementation code for the Juno platform as an example.