samples: tfm_integration: fix build & flash guides for all platforms

Add documentation on how to build and run the TF-M integration
samples on nRF platforms.

The arm-none-eabi-gcc does not need to be on the PATH anymore
for building and running the tfm_ipc sample on nucleo so remove
the note from the sample docs.

Fix some paths for TFM binaries for the LPC board as well.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>

samples/tfm_integration/psa_level_1/README.rst

@@ -140,13 +140,46 @@ and non-secure (``zephyr.hex``) images wth a J-Link as follows:
    .. code-block:: console
 
       JLinkExe -device lpc55s69 -if swd -speed 2000 -autoconnect 1
-      J-Link>loadfile build/tfm/install/outputs/LPC55S69/tfm_s.hex
+      J-Link>loadfile build/tfm/install/outputs/NXP/LPCXPRESSO55S69/tfm_s.hex
       J-Link>loadfile build/zephyr/zephyr.hex
 
 NOTE: At present, the LPC55S69 doesn't include support for the MCUBoot bootloader.
 
 We need to reset the board manually after flashing the image to run this code.
 
+On nRF5340 and nRF9160:
+=======================
+
+Build Zephyr with a non-secure configuration
+(``-DBOARD=nrf5340pdk_nrf5340_cpuappns`` or ``-DBOARD=nrf9160dk_nrf9160ns``).
+
+   Example, for nRF9160, using ``cmake`` and ``ninja``
+
+   .. code-block:: bash
+
+      cd <ZEPHYR_ROOT>/samples/tfm_integration/psa_level_1/
+      rm -rf build
+      mkdir build && cd build
+      cmake -GNinja -DBOARD=nrf9160dk_nrf9160ns ..
+
+If building with BL2 (MCUboot bootloader) enabled, manually flash
+the MCUboot bootloader image binary (``bl2.hex``).
+
+   Example, using ``nrfjprog`` on nRF9160:
+
+   .. code-block:: bash
+
+      nrfjprg -f NRF91 --program tfm/bin/bl2.hex --sectorerase
+
+Finally, flash the concatenated TF-M + Zephyr binary.
+
+   Example, for nRF9160, using ``cmake`` and ``ninja``
+
+   .. code-block:: bash
+
+      ninja flash
+
+
 Sample Output
 =============
 

samples/tfm_integration/tfm_ipc/README.rst

@@ -114,7 +114,7 @@ Build Zephyr with a non-secure configuration:
 
       $ west build -b nucleo_l552ze_q_ns samples/tfm_integration/tfm_ipc/
 
-Two scripts are avalaible in the ``build/tfm/install`` folder:
+Two scripts are avalaible in the ``build/tfm`` folder:
 
   - ``regression.sh``: Sets platform option bytes config and erase platform.
   - ``TFM_UPDATE.sh``: Writes bl2, secure, and non secure image in target.
@@ -123,8 +123,8 @@ Run them in the following order to flash the board:
 
    .. code-block:: bash
 
-      $ ./build/tfm/install/regression.sh
+      $ ./build/tfm/regression.sh
-      $ ./build/tfm/install/TFM_UPDATE.sh
+      $ ./build/tfm/TFM_UPDATE.sh
 
 Reset the board.
 
@@ -146,13 +146,46 @@ and non-secure (``zephyr.hex``) images wth a J-Link as follows:
    .. code-block:: console
 
       JLinkExe -device lpc55s69 -if swd -speed 2000 -autoconnect 1
-      J-Link>loadfile build/tfm/install/outputs/LPC55S69/tfm_s.hex
+      J-Link>loadfile build/tfm/install/outputs/NXP/LPCXPRESSO55S69/tfm_s.hex
       J-Link>loadfile build/zephyr/zephyr.hex
 
 NOTE: At present, the LPC55S69 doesn't include support for the MCUBoot bootloader.
 
 We need to reset the board manually after flashing the image to run this code.
 
+On nRF5340 and nRF9160:
+=======================
+
+Build Zephyr with a non-secure configuration
+(``-DBOARD=nrf5340pdk_nrf5340_cpuappns`` or ``-DBOARD=nrf9160dk_nrf9160ns``).
+
+   Example, for nRF9160, using ``cmake`` and ``ninja``
+
+   .. code-block:: bash
+
+      cd <ZEPHYR_ROOT>/samples/tfm_integration/psa_level_1/
+      rm -rf build
+      mkdir build && cd build
+      cmake -GNinja -DBOARD=nrf9160dk_nrf9160ns ..
+
+If building with BL2 (MCUboot bootloader) enabled, manually flash
+the MCUboot bootloader image binary (``bl2.hex``).
+
+   Example, using ``nrfjprog`` on nRF9160:
+
+   .. code-block:: bash
+
+      nrfjprg -f NRF91 --program tfm/bin/bl2.hex --sectorerase
+
+Finally, flash the concatenated TF-M + Zephyr binary.
+
+   Example, for nRF9160, using ``cmake`` and ``ninja``
+
+   .. code-block:: bash
+
+      ninja flash
+
+
 Sample Output
 =============