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# Ethos-U core software
## Building
The core software is built with CMake. It is recommended to build out of tree
like illustrated below.
```
$ mkdir build
$ cd build
$ cmake .. -DCMAKE_TOOLCHAIN_FILE=<toolchain> -DCMAKE_SYSTEM_PROCESSOR=cortex-m<nr><features>
$ make
```
Available build options can be listed with `cmake -LH ..`.
Supported CPU targets are any of the Cortex-M processors with any of the
supported features, for example cortex-m33+nodsp+nofp. A toolchain file is
required to cross compile the software.
# License
The Arm Ethos-U Core Software is provided under an Apache-2.0 license. Please
see [LICENSE.txt](LICENSE.txt) for more information.
# Contributions
The Arm Ethos-U project welcomes contributions under the Apache-2.0 license.
Before we can accept your contribution, you need to certify its origin and give
us your permission. For this process we use the Developer Certificate of Origin
(DCO) V1.1 (https://developercertificate.org).
To indicate that you agree to the terms of the DCO, you "sign off" your
contribution by adding a line with your name and e-mail address to every git
commit message. You must use your real name, no pseudonyms or anonymous
contributions are accepted. If there are more than one contributor, everyone
adds their name and e-mail to the commit message.
```
Author: John Doe \<john.doe@example.org\>
Date: Mon Feb 29 12:12:12 2016 +0000
Title of the commit
Short description of the change.
Signed-off-by: John Doe john.doe@example.org
Signed-off-by: Foo Bar foo.bar@example.org
```
The contributions will be code reviewed by Arm before they can be accepted into
the repository.
## Security
Please see [Security](SECURITY.md).
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