Porting to i686-msdosdjgpp

[David Holmes]

On 21/11/2021 11:44 pm, Eric Bresie wrote:
> At the time of phoneME there was also some licensing concerns if it was 
> to be used on a specific (phone) platform which resulted in a lot of 
> fragmentation in the JavaME market with each platform having to 
> implement their own native flavor and consider licensing fees.
> 
> I believe the idea with openjdk and the assorted profiles and modularity 
>   related changes that phoneME (java ME) more or less became OBE open 
> source jdk.  The rational being rather than maintain a Java and JavaME 
> flavor of code base, have a single Java based (with modularize compact 
> profile running on embedded platforms.

Not quite. Java ME and running Java on phones was a completely different 
operating space. What the Compact Profiles did was allow for Java SE 
Embedded to be brought into the fold of OpenJDK (which was Java SE). It 
was still targeted at high-end "embedded" devices, not the small devices 
that Java ME targeted. For SE on other devices the Mobile project was 
formed:

http://openjdk.java.net/projects/mobile/

David
-----

>  From
> https://www.electronicdesign.com/technologies/dev-tools/article/21801464/11-myths-about-embedded-java 
> <https://www.electronicdesign.com/technologies/dev-tools/article/21801464/11-myths-about-embedded-java>
> 
> “ In JDK 8, steps were taken to address this with the introduction of 
> three compact profiles, the smallest of which only requires a little 
> over 10 MB of storage. In JDK 9, scheduled for release in Spring 2017, 
> the JDK will be fully modularized so that application developers can 
> select only the modules they need to run their application. ”
> 
> On a related note
> https://minexew.github.io/2021/04/10/phoneme.html 
> <https://minexew.github.io/2021/04/10/phoneme.html>
> 
> Eric
> 
> On Fri, Nov 19, 2021 at 6:05 AM Thomas Stüfe <thomas.stuefe at gmail.com 
> <mailto:thomas.stuefe at gmail.com>> wrote:
> 
> 
> 
>     On Fri, Nov 19, 2021 at 12:25 PM Magnus Ihse Bursie
>     <magnus.ihse.bursie at oracle.com
>     <mailto:magnus.ihse.bursie at oracle.com>> wrote:
> 
>         On 2021-11-17 14:27, Thomas Stüfe wrote:
>>
>>
>>         On Wed, Nov 17, 2021 at 1:57 PM Magnus Ihse Bursie
>>         <magnus.ihse.bursie at oracle.com
>>         <mailto:magnus.ihse.bursie at oracle.com>> wrote:
>>
>>
>>
>>             On 2021-11-16 07:19, Thomas Stüfe wrote:
>>>
>>>
>>>             On Mon, Nov 15, 2021 at 11:09 PM David Holmes
>>>             <david.holmes at oracle.com
>>>             <mailto:david.holmes at oracle.com>> wrote:
>>>
>>>                 On 16/11/2021 12:06 am, gnufan42 wrote:
>>>                 > David Holmes wrote:
>>>                 >> I'd say it is technically impossible to port
>>>                 OpenJDK to DOS as you do
>>>                 >> not have any of the necessary operating system
>>>                 support for threads,
>>>                 >> synchronization, virtual memory, ....
>>>                 >
>>>                 >       Well, these difficulties are all overcame by
>>>                 the DJGPP project. They use DPMI to let the code runs
>>>                 in 32-bit protected mode, they implemented a lot of
>>>                 POSIX functions, including pthread. Otherwise I won't
>>>                 be trying.
>>>
>>>                 I'd never heard of DJGPP but the pthread support
>>>                 still seems limited -
>>>                 hard to find an accurate current description of what
>>>                 is actually
>>>                 supported. So I would not say these difficulties are
>>>                 overcome :) This
>>>                 will be an exceedingly complex and challenging project.
>>>
>>>                 Cheers,
>>>                 David
>>>
>>>
>>>             I still think that the CVM (JavaME) may be better suited
>>>             for the task. From the time I worked with it I remember
>>>             that it was targeted to low-memory devices, its C code
>>>             base was extremely portable, it was very configurable
>>>             (important for embedded) etc. We ran it with green
>>>             threading (like Loom today) and that worked. OpenJDK OTOH
>>>             relies on native posix threads, and there is no easy way
>>>             around that.
>>>
>>>             I seemed to remember that Sun open-sourced JavaME in
>>>             2006. But I could not find the project page.
>>>
>>>             https://en.wikipedia.org/wiki/Java_Platform,_Micro_Edition <https://en.wikipedia.org/wiki/Java_Platform,_Micro_Edition>
>>>             https://en.wikipedia.org/wiki/PhoneME
>>>             <https://en.wikipedia.org/wiki/PhoneME>
>>>
>>>             PhoneME website seems defunct now. Does anyone know what
>>>             happened with that project?
>>             Wikipedia has links to archive.org <http://archive.org>.
>>             https://archive.org/details/phoneme-svn.dump
>>             <https://archive.org/details/phoneme-svn.dump> for the
>>             source code.
>>
>>             /Magnus
>>
>>
>>
>>         Ah, I missed that. But seems this project is not actively
>>         maintained anymore. Pity.
>         Yes, it's a shame. I felt sorry for the source code, just lying
>         rotting there as a SVN dump on archive.org <http://archive.org>,
>         so I installed subversion, made a few scripts, and converted it
>         to git and put it on Github. [1]
> 
>         That won't bring active development back, but at least the
>         source code is accessible for archaeological reasons. And maybe
>         it'll be enough to get someone to bring it back to life...
> 
>         /Magnus
> 
>         [1] https://github.com/magicus/phoneME
>         <https://github.com/magicus/phoneME>
> 
> 
>     This is awesome, Magnus! And with full commit history too.
> 
>     So many memories :)
> 
> 
> -- 
> Eric Bresie
> ebresie at gmail.com <mailto:ebresie at gmail.com>