Hi all, I'm looking into the avr32 architecture implementation, as compiling the kernel gives you several warnings about system calls which are missing. I had a look in the unistd.h file I realized that system call numbers differ widely from other architectures (I had a look at arm and x86). Are the system call numbers platform specific. As far as I understand, the system calls are "wrapped" in libc. So I wonder if [g,e,uC]libc uses a different system call number each architecture. A look in the source of uClibc didn't helped me to clear my doubts. If not all system calls are implemented for avr32: - is there a problem at all, or does libc implementation take care of not implemented system calls? - if I want to add a system call, what are the steps needed? Best regards, Matthias