GSoC 2020: OFW Import To RTEMS License Issue

[Niteesh G. S.]

Hello,

In a recent review of these patches
https://lists.rtems.org/pipermail/devel/2020-July/060653.html
Gedare mentioned that we cannot use these patches with the
current license. More details regarding the conversation can be
found in the following archive.
https://lists.rtems.org/pipermail/devel/2020-July/061000.html

The following files have been ported to RTEMS to implement
the OFW API.
1) openfirm.h  -- BSD-4 License
2) openfirm.c  -- BSD-4 License
3) ofw_fdt.c    -- BSD-2 License

The files with BSD4 cannot be used and Gedare suggested to
check if we can remove the entire 4-clause cluster or remove
clauses #3 and #4. I checked this along with the help of Christian
and it seems that we can't remove those. Christian suggested
that we can use the header file with the BSD-4 license to some
extent but the source files to pose a problem. We also checked
OpenBSD it has the same licensing.

So we have come up with the following suggestions
1) Use the header files as it is.
2) Most OF_* functions defined in openfirm.c have 1:1 mapping
with the FDT implementation in ofw_fdt.c so there is a possibility
to remove openfirm.c and only use openfirm.h and ofw_fdt.c.
For those functions which don't have a 1:1 mapping, we can add
an implementation in ofw_fdt.c. And remove the functions which
don't have an FDT based implementation eg. OF_write, OF_open etc.

Also please remember that these patches were created with a goal
to import the OFW into RTEMS and remove them from libBSD so
will using the above approach has a chance of breaking libBSD
compatibility in the future?

Thanks,
Niteesh.
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