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bootloader/mcuboot/samples/zephyr/README.md

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+# Zephyr sample application.
+
+In order to successfully deploy an application using MCUboot, it is
+necessary to build at least one other binary: the application itself.
+It is beyond the scope of this documentation to describe what an
+application is able to do, however a working example is certainly
+useful.
+
+Please see the comments in the Makefile in this directory for more
+details on how to build and test this application.
+
+Note that this sample uses the "ninja" build tool, which can be
+installed on most systems using the system package manager, e.g., for
+a Debian-based distro:
+
+```
+$ sudo apt-get install ninja
+```
+
+or in Fedora:
+
+```
+$ sudo dnf install ninja
+```