[nrfconnect] Fixed bootloader external flash configuration (#25271)

Due to nRF Connect SDK core changes, the mcuboot configuration
is not correct, so it's not using external flash and Device
Firmware Upgrade fails.

Added board overlays to enable using external flash by the
mcuboot.
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.conf b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.conf
new file mode 100644
index 0000000..cd9aab4
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.conf
@@ -0,0 +1,17 @@
+#
+#    Copyright (c) 2022 Project CHIP Authors
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+#
+
+CONFIG_GPIO=y
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.conf b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.conf
new file mode 100644
index 0000000..cd9aab4
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.conf
@@ -0,0 +1,17 @@
+#
+#    Copyright (c) 2022 Project CHIP Authors
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+#
+
+CONFIG_GPIO=y
diff --git a/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/all-clusters-minimal-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/light-switch-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lighting-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/lock-app/nrfconnect/child_image/mcuboot/boards/nrf7002dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/pump-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/pump-controller-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf52840dk_nrf52840_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
new file mode 100644
index 0000000..f18e3e0
--- /dev/null
+++ b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
diff --git a/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
new file mode 100644
index 0000000..0728eff
--- /dev/null
+++ b/examples/window-app/nrfconnect/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_release.overlay
@@ -0,0 +1,21 @@
+/*
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};