JVM

Hi,

Probably a very dumb question however - does anybody know what effort it 
takes to port a JVM to an embedded Linux on a Freescale ColdFire Processor ?

Thanks,

John

On Jan 3, 3:55=A0am, "John Aderseen" <J...@Aderseen.com> wrote:

> Probably a very dumb question however - does anybody know what effort it
> takes to port a JVM to an embedded Linux on a Freescale ColdFire Processor=
 ?

I don't know that I am answering the question you think you're asking,
but porting a JVM if you have a POSIX build environment is simply a
matter of compiling it. It's just a bytecode interpreter with more or
less no system dependencies. A potentially much more involved project
is to build the JRE, which is required for any nontrivial Java
implementation. It depends rather on how much functionality you're
going to require.

It's what I had in mind but as I am rather novice in JVM and JRE I prefer 
asking basic questions (even if they seem dumb to experts like you may be - 
sorry about that). So thank you for the answer !

John

"larwe" <zwsdotcom@gmail.com> a &#4294967295;crit dans le message de news: 
44a98ac3-81a1-4748-8cc5-e95492d460cc@e23g2000prf.googlegroups.com...
On Jan 3, 3:55 am, "John Aderseen" <J...@Aderseen.com> wrote:

> Probably a very dumb question however - does anybody know what effort it
> takes to port a JVM to an embedded Linux on a Freescale ColdFire Processor 
> ?

I don't know that I am answering the question you think you're asking,
but porting a JVM if you have a POSIX build environment is simply a
matter of compiling it. It's just a bytecode interpreter with more or
less no system dependencies. A potentially much more involved project
is to build the JRE, which is required for any nontrivial Java
implementation. It depends rather on how much functionality you're
going to require. 

On Jan 3, 3:55=A0am, "John Aderseen" <J...@Aderseen.com> wrote:

> Probably a very dumb question however - does anybody know what effort it
> takes to port a JVM to an embedded Linux on a Freescale ColdFire Processor=
 ?

There is a portable JVM for small devices, whose name escapes me at
the moment, but it likely doesn't have any specific knowledge of the
Coldfire, such as native methods to access the various on-chip
peripherals. I can get the name of this if you really want to write
the native methods yourself.

I have experimented with NanoVM, and that works good on small MCU's
that don't have much memory. But that also requires native methods to
be written.

Just for clarification, do you want one that runs under linux on a
Coldfire (I guess there is a flavor of linux that can run on
Coldfire?), or one that runs standalone?

Eric

Un bel giorno Eric digit�:

>> Probably a very dumb question however - does anybody know what effort it
>> takes to port a JVM to an embedded Linux on a Freescale ColdFire Processor ?
> 
> There is a portable JVM for small devices, whose name escapes me at
> the moment

Probably the KVM:
http://java.sun.com/javame/index.jsp

CLDC/KVM sources are only free for personal/academic use, they aren't GPL
as far as I know. Adapting them for a platform that supports Linux (and
consequently the gcc toolchain) is fairly easy.

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