Re: [kaffe] avr32 port

[Nevo]

hi,Guennadi:

Guennadi Liakhovetski wrote:
On Thu, 8 May 2008, Nevo wrote:

  
Guennadi Liakhovetski wrote:
    
On Thu, 8 May 2008, Nevo wrote:
  
      
   There has been a crazy idea for me to  embed kaffe VM or phoneme CDC vm
to
Linux kernel as a separate module to speed up vm execution,so vm can
directly
access hardware. But you know,that should break up the role of JVM as a
sandbox...... and we chould not prove the feasibility yet...
    
        
Yeah, don't think the kernel crowd would be particularly inspired by this
idea:-)
  
      
  Maybe Java OS might be more specific and practical :) . Anyway ,it is on my
ToDO list.
    

You are late (at least on AVR): 
http://www.harbaum.org/till/nanovm/index.shtml
  
  nanovm ? :) that's too hardware dependent.  But the overview concept 
is approaching my idea . Thank you very much.
  
   Now I saw your idea, I guess you mean JIT on AVR32 ?
    
        
Well, in "Java Technical Reference" from Atmel they call it "Java Extension
Module (JEM)".
  
      
  if you wanna do hardware acceleration ,we could consider libJIT which is
mentioned Kaffe document.
    

Well, I'm not an expert in this, but I don't know if this really would 
make any improvement. With hardware acceleration you "just" throw your 
bytecode at the CPU and it processes it just as if it were native code. 
So, I don't see how JIT could be useful here. Also, it is unlikely to make 
our work easier, or would it? I'd go as simple as possible to start with.
  
  You mignt mean Jazelle like technology actually. 
  
I've been as a JVM developer for mobile & CE devices. Maybe I would be
glad to help you make you do a port to AVR32 ,but I am in China,the AVR
board might not be easy to find in public market ..
    
        
That sounds very good! Now, after I've written my first email to the kaffee
ML, I found JamVM, which is smaller, and is already ported to AVR32! In pure
software mode, of course. So, I think, we could start with that one. If you
prefer kaffee, you are certainly most welcome to try to port it over too! We
anyway have ti first get it run in software mode, before implementing
hardware acceleration.
  
      
   Yep,both Kaffe and JamVM are good thing to learn. What kind of applications
would you want to run on  AVR32?
    

Ideally none:-) As I said, I'm just interested in the idea per se. Will 
see how it comes out.
  
  Hardware accelerated jvm for embedded device would be promising and 
much interesting . We could see on that day.
  
On low-end devices,enable JIT would be expensive.
    

Ok, then we better forget it (for now at least).

  
   Now that JamVM is working on AVR32,maybe we need some benchmark or
something.
   I have said that I would be glad and interested to help a fresh port on
AVR32 ,so i think  JamVM would be fine..:)
    

Good! Then I would suggest to move further discussion to the jamvm list 
(https://lists.sourceforge.net/lists/listinfo/jamvm-general). I'll write 
there with CC you and attach a very slightly cleaned up avr32 patch for 
JamVM from Leen Toelen.

  
As for the hardware - as I said, as soon as I get the board, I can provide
an ssh login to it to you or any other interester parties. I could even
provide a serial console, if that will be needed too. I think, this should
be enough for the beginning.
  
      
 That would be great....  There should be many experts here.....:)
    

I'll let you know when the board arrives.
  
  Thank you :) . Maybe I should find some emulator first :)
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer

  

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