St?phane, thanks for your help. But I think that, except instruction eieio, I do similar things. You use the virtual address returned by mmap but have you the same values if you use write/read(axs_mem_fd,...) instead of in_8/out_8. That is my problem : I want to be sure that when I use the virtual address returned by mmap, I access really to the physical memory mapped area.
Do you know a shell command in order to dump the memory and verify what I do ? ---------------------------------------------------------- Sophie CARAYOL TECHNOLOGIES & SYSTEMES 50 rue du Pr?sident Sadate F - 29337 QUIMPER CEDEX T?l: +33 2 98 10 30 06 mailto:scarayol at assystembrime.com ----------------------------------------------------------