[ELDK] gdbserver issues on xilinx PPC440 Virtex5FX with ELDK4.2

Frederic LEGER frederic.leger at esisar.grenoble-inp.fr
Fri Feb 13 09:19:38 CET 2009

Hello Detlev,

Xilinx FAE guy reproduced my problem. Now I am almost certain it comes from
the Xilinx 2.6.28 linux tree.
I'll have a try today with an old archive of 2.6.27-rc4.  
Below is the message from Tom Curran (AVNET).

Best regards,


-----Message d'origine-----
De : Curran, Tom [mailto:Tom.Curran at Avnet.com] 
Envoyé : vendredi 13 février 2009 04:15
À : Frederic LEGER; Haudebourg, Mickael (Silica)
Objet : RE: Running GDBserver on AVNET V5FX30T

Hi Frederic,

I've been able to duplicate your problem with gdb application debugging.
This appears to be a problem introduced with the 2.6.28 kernel.  I did not
have this problem before with the 2.6.27-rc9 kernel.  I will investigate
this further with Xilinx and get back to you soon.

Best Regards,

-----Message d'origine-----
De : Detlev Zundel [mailto:dzu at denx.de] 
Envoyé : jeudi 12 février 2009 19:21
À : Frederic.Leger at esisar.grenoble-inp.fr
Cc : eldk at lists.denx.de
Objet : Re: [ELDK] gdbserver issues on xilinx PPC440 Virtex5FX with ELDK4.2

Hello Frederic,

> I am currently trying to get a gdbserver working on a xilinx PPC440 
> V5FX30T board.
> I have experienced immediate good results on the PPC405 on xilinx V4FX12.


> Problem is: gdbserver crashes when gdb (HOST) is trying to run or 
> continue with breakpoints.

While I cannot say too much here, I would strongly suggest that you post
more details on how gdbserver actually crashes.  Maybe this rings a bell for

> Only one time, surprizingly, I got a full run and normal exit (no
> breakpoints) under gdbserver.

This makes me nervous.  Non-deterministic behaviour either points to
unstable hardware to test-conditions not fully under control, i.e. some
parameters in the system change that may seem unlinked at first.  I would
try to research here a little bit more - and write a logbook for yourself of
the tests.  Usually this turns out to be worth *a lot* when new insights can
be used to re-classify the old tests and vice versa those tests can be used
to test new insights.


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