RTEMS LwIP licensing and organization cleanup proposal

[Pavel Pisa]

Dear Premek and other developers,

I am happy that LwIP is getting into state
of viable alternative of TCP/IP stack for
resource constrained RTEMS targets.

But as I have already reported before, I would
be happy if the code licenses and locations are cleanup.

The RTEMS core integration layer is held in uLan/ports/os/rtems
subdirectory

  https://git.rtems.org/rtems-lwip/tree/uLan/ports/os/rtems/arch/sys_arch.c

It should be moved somewhere else, i.e. under

  https://git.rtems.org/rtems-lwip/tree/rtemslwip/common

but for sure the reference to our uLAN project is nonsense in this
content

  https://ulan.sourceforge.net/

even that initial LwIP integration for RTEMS is based on our
previous work in frame of that project for system-less and later
RTEMS use.

To make integration with RTEMS easier, the source should
be relicensed to some common actual RTEMS license template,
for example

  https://git.rtems.org/rtems/tree/bsps/arm/lpc176x/start/bspstart.c

We have referenced Swedish Institute of Computer Science license
there to allow integration even to some official LwIP port
but except for function and defines names the code is our own
so RTEMS copyright with reference to implementation inspired by
other LwIP OS integration should be OK.

I have contacted Premysl Houdek who worked on project during
his RTEMS GSoC and followup diploma thesis

  https://support.dce.felk.cvut.cz/mediawiki/images/f/f1/Dp_2016_houdek_premysl.pdf

and he is prepared to confirm relicensing to any RTEMS fitting
open source license.

For actual RTEMS LwIP users and contributors, please propose license change
or chose some of above offers and then propose new files location including
git patches or I can take that action if 

Best wishes,

                Pavel
-- 
                Pavel Píša
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