[ECOS] Debugging multi-threaded eCos application using GDB

[Nadine dot Albiez-extern at ascom dot fr]

Hello,
I have a question about debugging an eCos  multi-threaded application using gdb.
When I want to see the list of my threads , the command "info threads" returns nothing

     (gdb) info threads
          (gdb) thread 1
           Thread ID 1 not known.  Use the "info threads" command to
           see the IDs of currently known threads.

What can I do for enabling the multi-threaded ? When I use a linux test application I have no problem, "info threads" returns the list of threads.....
Is there any option when generating the eCos kernel to allow Gdb to see the eCos's Thread (cyg_thread_create)?
I observe the same behavior with the example program "two_threaded".
Is there a package to add to ecos.ecc? I use eCos version 1.4.8. , gdb version 4.18 (I try gdb 5.0 with the same result) and work on a linux target .

Thanks for your help

     Nadine Albiez