Initial commit

Initial commit.

bootloader/mcuboot/ext/nrf/README.md

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+# Building MCUboot with nRF52840 CC310 enabled
+
+## Prerequisites
+
+Clone [nrfxlib](https://github.com/NordicPlayground/nrfxlib) next to the MCUboot root folder. So that it's located `../nrfxlib` from MCUboot root folder.
+
+## Building
+
+make sure `root-ec-p256.pem` is set as the certificate and that `CONFIG_BOOT_SIGNATURE_TYPE_ECDSA_P256` is selected not `CONFIG_BOOT_SIGNATURE_TYPE_RSA` in `prj.conf` of `boot/zephyr`.
+Since it defaults to tinycrypt you'll have to go into `menuconfig` and change the implementation selection to `cc310` or also set this in `prj.conf`.
+
+```
+mkdir build && cd build
+cmake -GNinja -DBOARD=nrf52840dk/nrf52840
+ninja flash
+```
+
+Build a hello world example in zephyr and sign it with imgtool.py with the `root-ec-p256.pem` and flash it at `FLASH_AREA_IMAGE_0`.