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+Runtime Instrumentation Testing - N1SDP
+=======================================
+
+For this test we used the N1 System Development Platform (`N1SDP`_), which
+contains an SoC consisting of two dual-core Arm N1 clusters.
+
+The following source trees and binaries were used:
+
+- TF-A [`v2.9-rc0-16-g666aec401`_]
+- TFTF [`v2.9-rc0`_]
+- SCP/MCP `Prebuilt Images`_
+
+Please see the Runtime Instrumentation `Testing Methodology`_ page for more
+details.
+
+Procedure
+---------
+
+#. Build TFTF with runtime instrumentation enabled:
+
+    .. code:: shell
+
+        make CROSS_COMPILE=aarch64-none-elf- PLAT=n1sdp \
+            TESTS=runtime-instrumentation all
+
+#. Build TF-A with the following build options:
+
+    .. code:: shell
+
+        make CROSS_COMPILE=aarch64-none-elf- PLAT=n1sdp \
+            ENABLE_RUNTIME_INSTRUMENTATION=1 fiptool all
+
+#. Fetch the SCP firmware images:
+
+    .. code:: shell
+
+        curl --fail --connect-timeout 5 --retry 5 \
+            -sLS -o build/n1sdp/release/scp_rom.bin \
+            https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-bl1.bin
+        curl --fail --connect-timeout 5 \
+            --retry 5 -sLS -o build/n1sdp/release/scp_ram.bin \
+            https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-bl2.bin
+
+#. Fetch the MCP firmware images:
+
+    .. code:: shell
+
+        curl --fail --connect-timeout 5 --retry 5 \
+            -sLS -o build/n1sdp/release/mcp_rom.bin \
+            https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-mcp-bl1.bin
+        curl --fail --connect-timeout 5 --retry 5 \
+            -sLS -o build/n1sdp/release/mcp_ram.bin \
+            https://downloads.trustedfirmware.org/tf-a/css_scp_2.12.0/n1sdp/release/n1sdp-mcp-bl2.bin
+
+#. Using the fiptool, create a new FIP package and append the SCP ram image onto
+   it.
+
+    .. code:: shell
+
+        ./tools/fiptool/fiptool create --blob \
+                uuid=cfacc2c4-15e8-4668-82be-430a38fad705,file=build/n1sdp/release/bl1.bin \
+                --scp-fw build/n1sdp/release/scp_ram.bin build/n1sdp/release/scp_fw.bin
+
+#. Append the MCP image to the FIP.
+
+    .. code:: shell
+
+        ./tools/fiptool/fiptool create \
+            --blob uuid=54464222-a4cf-4bf8-b1b6-cee7dade539e,file=build/n1sdp/release/mcp_ram.bin \
+            build/n1sdp/release/mcp_fw.bin
+
+#. Then, add TFTF as the Non-Secure workload in the FIP image:
+
+    .. code:: shell
+
+        make CROSS_COMPILE=aarch64-none-elf- PLAT=n1sdp \
+            ENABLE_RUNTIME_INSTRUMENTATION=1 SCP_BL2=/dev/null \
+            BL33=<path/to/tftf.bin>  fip
+
+#. Load the following images onto the development board: ``fip.bin``,
+   ``scp_rom.bin``, ``scp_ram.bin``, ``mcp_rom.bin``, and ``mcp_ram.bin``.
+
+.. note::
+
+    These instructions presume you have a complete firmware stack. The N1SDP
+    `user guide`_ provides a detailed explanation on how to get setup from
+    scratch.
+
+Results
+-------
+
+``CPU_SUSPEND`` to deepest power level
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. table:: ``CPU_SUSPEND`` latencies (µs) to deepest power level in
+        parallel
+
+    +---------+------+-----------+---------+-------------+
+    | Cluster | Core | Powerdown | Wakekup | Cache Flush |
+    +=========+======+===========+=========+=============+
+    |    0    |  0   |    3.44   |  10.04  |     0.4     |
+    +---------+------+-----------+---------+-------------+
+    |    0    |  1   |    4.98   |  12.72  |     0.16    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  0   |    3.58   |  15.42  |     0.2     |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  1   |    5.24   |  17.78  |     0.18    |
+    +---------+------+-----------+---------+-------------+
+
+.. table:: ``CPU_SUSPEND`` latencies (µs) to deepest power level in
+        serial
+
+    +---------+------+-----------+---------+-------------+
+    | Cluster | Core | Powerdown | Wakekup | Cache Flush |
+    +=========+======+===========+=========+=============+
+    |    0    |  0   |    1.82   |   9.98  |     0.32    |
+    +---------+------+-----------+---------+-------------+
+    |    0    |  1   |    1.96   |   9.96  |     0.18    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  0   |    2.0    |   10.5  |     0.16    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  1   |    2.22   |  10.56  |     0.16    |
+    +---------+------+-----------+---------+-------------+
+
+``CPU_SUSPEND`` to power level 0
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. table:: ``CPU_SUSPEND`` latencies (µs) to power level 0 in
+        parallel
+
+    +---------+------+-----------+---------+-------------+
+    | Cluster | Core | Powerdown | Wakekup | Cache Flush |
+    +=========+======+===========+=========+=============+
+    |    0    |  0   |    1.52   |  11.84  |     0.34    |
+    +---------+------+-----------+---------+-------------+
+    |    0    |  1   |    1.1    |  13.66  |     0.14    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  0   |    2.18   |   9.48  |     0.18    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  1   |    2.06   |   14.4  |     0.16    |
+    +---------+------+-----------+---------+-------------+
+
+.. table:: ``CPU_SUSPEND`` latencies (µs) to power level 0 in serial
+
+    +---------+------+-----------+---------+-------------+
+    | Cluster | Core | Powerdown | Wakekup | Cache Flush |
+    +=========+======+===========+=========+=============+
+    |    0    |  0   |    1.54   |   9.34  |     0.3     |
+    +---------+------+-----------+---------+-------------+
+    |    0    |  1   |    1.88   |   9.5   |     0.16    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  0   |    1.86   |   9.86  |     0.2     |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  1   |    2.02   |   9.64  |     0.18    |
+    +---------+------+-----------+---------+-------------+
+
+``CPU_OFF`` on all non-lead CPUs
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+``CPU_OFF`` on all non-lead CPUs in sequence then, ``CPU_SUSPEND`` on the lead
+core to the deepest power level.
+
+.. table:: ``CPU_OFF`` latencies (µs) on all non-lead CPUs
+
+    +---------+------+-----------+---------+-------------+
+    | Cluster | Core | Powerdown | Wakekup | Cache Flush |
+    +=========+======+===========+=========+=============+
+    |    0    |  0   |    1.86   |   9.88  |     0.32    |
+    +---------+------+-----------+---------+-------------+
+    |    0    |  1   |    21.1   |  12.44  |     0.42    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  0   |   21.22   |   13.2  |     0.32    |
+    +---------+------+-----------+---------+-------------+
+    |    1    |  1   |   21.56   |  13.18  |     0.54    |
+    +---------+------+-----------+---------+-------------+
+
+``CPU_VERSION`` in parallel
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. table:: ``CPU_VERSION`` latency (µs) in parallel on all cores
+
+    +-------------+--------+--------------+
+    |   Cluster   |  Core  |   Latency    |
+    +=============+========+==============+
+    |      0      |   0    |     0.08     |
+    +-------------+--------+--------------+
+    |      0      |   1    |     0.22     |
+    +-------------+--------+--------------+
+    |      1      |   0    |     0.28     |
+    +-------------+--------+--------------+
+    |      1      |   1    |     0.26     |
+    +-------------+--------+--------------+
+
+--------------
+
+*Copyright (c) 2023, Arm Limited. All rights reserved.*
+
+.. _v2.9-rc0-16-g666aec401: https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/refs/heads/v2.9-rc0-16-g666aec401
+.. _v2.9-rc0: https://review.trustedfirmware.org/plugins/gitiles/TF-A/tf-a-tests/+/refs/tags/v2.9-rc0
+.. _user guide: https://gitlab.arm.com/arm-reference-solutions/arm-reference-solutions-docs/-/blob/master/docs/n1sdp/user-guide.rst
+.. _Prebuilt Images:  https://downloads.trustedfirmware.org/tf-a/css_scp_2.11.0/n1sdp/release/
+.. _N1SDP: https://developer.arm.com/documentation/101489/latest
+.. _Testing Methodology: ../perf/psci-performance-methodology.html
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