Hi Mark,
the license incompatibilty issues with STs standard peripheral library are based on some uncommon license headers they are using in the lib. As RIOT is licensed under LGPLv2, we try to make sure, that all code included in the github repository is also LGPLv2 or at least compatible to it.
The CMSIS files provided by ARM are using a license, that in our opinion is compatible with RIOT, so we have no worry to include these files. ST uses for most of their stuff a license that can be found in [1]. I am not too much an expert when it comes to these questions, but to our understanding it should be fine to ship files with this license with RIOT. When using the ST lib, there are however some files included, that use a quite different license. An example would be the following:
** (c)Copyright Atollic AB. ** You may use this file as-is or modify it according to the needs of your ** project. Distribution of this file (unmodified or modified) is not ** permitted. Atollic AB permit registered Atollic TrueSTUDIO(R) users the ** rights to distribute the assembled, compiled & linked contents of this ** file as part of an application binary file, provided that it is built ** using the Atollic TrueSTUDIO(R) toolchain.
We do not feel comfortable to include this kind of licensed files into RIOT, that is the main reason for the third-party repository...
Cheers, Hauke
[1] http://www.st.com/software_license_agreement_liberty_v2
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