Has anyone tried to port Mono to RTEMS

[Joel Sherrill]

On Wed, May 24, 2017 at 9:43 AM, xuelin.tian <xuelin.tian at qkmtech.com>
wrote:

> Thanks a lot.
> And I have one last concern, what platform did you use then? Is there so
> much work on assembly part (or native language)?
>
>
I don't recall running across any assembly language and I usually try to
port to the sparc
as the experiment.  But I wouldn't trust my memory on that. It could also
have changed
in the 5+ years since I did this. :)

And.. I just remembered.. Chris Johns and I spoke to at least one of the
Mono developers
at a Mentor Summit. They were interested in an embedded Mono. So hopefully
they
haven't done anything to make it harder to realize. But, that could have
been a
desperate attempt for funding. :)

--joel

>
>
> ------------------ Original ------------------
> *From: * "Joel Sherrill"<joel at rtems.org>;
> *Date: * Wed, May 24, 2017 09:21 PM
> *To: * "xuelin.tian at qkmtech.com"<xuelin.tian at qkmtech.com>;
> *Cc: * "users at rtems.org"<users at rtems.org>;
> *Subject: * Re: Re: Has anyone tried to port Mono to RTEMS
>
>
>
> On Wed, May 24, 2017 at 7:41 AM, xuelin.tian at qkmtech.com <
> xuelin.tian at qkmtech.com> wrote:
>
>> Thank you for your reply.
>>
>> Regardless of testing, are there any difficulties to port Mono to RTEMS?
>>
>
> I don't recall any particularly. Mostly it just was a bunch of functions
> for the interpreter
> that mapped to C Library and POSIX calls directly. You will have to figure
> out the
> "main()" that invokes the interpreter on an assembly (was that the right
> word)?
>
> My technique for porting estimates is to try to do it. Mostly fix minor
>> things or
>>
> #if 0 them if they require some time-consuming work. I don't recall doing
> much
> of that. The build system at the time was straightforward.
>
> --joel
>
>> ------------------------------
>> Best wishes,
>> xuelin.tian at qkmtech.com
>>
>>
>> *From:* Joel Sherrill <joel at rtems.org>
>> *Date:* 2017-05-24 20:19
>> *To:* xuelin.tian <xuelin.tian at qkmtech.com>
>> *CC:* rtems-users at rtems.org <users at rtems.org>
>> *Subject:* Re: Has anyone tried to port Mono to RTEMS
>>
>>
>> On May 23, 2017 8:58 PM, "xuelin.tian at qkmtech.com" <
>> xuelin.tian at qkmtech.com> wrote:
>>
>> Dear all,
>> Is that possible to port Mono to RTEMS? Has anyone tried this before?
>> As I notice that there is an open project in RTEMS projects.
>>
>>
>> Sometime ago, I was asked to provide an estimate for this. It had to be
>> between five and ten years ago because we were at the old office but after
>> we had done a few years of GSoC. I did enough work preparing the estimate
>> where I had the code building without too much effort. I saw the challenge
>> as getting the test suite running since you would have to create a test
>> harness and build/assembly helper that packaged the interpreted code with
>> the interpreter in order to run it. At that time, I envisioned having to
>> create a base image and a filesystem image per test.
>>
>> Our POSIX was good enough then to avoid much trouble. It should only be
>> easier now since the POSIX support has improved.
>>
>> There were a lot of Mono tests and I expected most to pass quickly. But
>> there was no way to know how many issues would be encountered and how many
>> root causes there would be. I expected to fix one or two things and then
>> run all the tests. That was where I expected time to be consumed.
>>
>> FWIW I recall the GSoC date part because they thought we could magically
>> get students to do testing for free on a schedule. :)
>>
>> I hope that helps. It is feasible but the key is testing.
>>
>> --joel
>>
>>
>> ------------------------------
>> Best wishes,
>> xuelin.tian at qkmtech.com
>>
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>>
>>
>>
>
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