Thanks a lot for your help, I found the problem and it works now ! :-D The reason is a bit stupid... The problem was in my screen initialization function, there was an old line, probably from a default demo used by my teammate to create the blank template with the new screen and sdram module. This line was the init of the SK board small screen. When I tested allocation in guix_thread_entry it was before this screen init. When we added sdram module we have reassigned some pins from the old screen to the ram bus so the init function disturbs memory allocation by writing LCD commands on the RAM bus.
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