I realy feel stupid bothering you with this problem, since it's probably due to my inexperience with altera products and/or bad AN comprehension. I designed a robot controler device in VHDL, including an "economic NIOS". The components of the SOPC are: - cpu - jtag-uart - onchip memory (ram) - avalon to external bus bridge - clock source - epcs serial flash controler - RS232-uart As I uploaded the sof file in RAM, then the ELF, there was no problem. If I upload a pof file in Flash, then a ELF in RAM, it works too. My problem occurs as I try to upload the ELF and the pof in Flash: if I turn the power off, then on again, nothing seems to occur, except the leds that are slightly lits. I read the Nios II Flash Programmer, but obviously missed my mistake. Here is my procedure: 1)generate SOF file. 2)convert it in POF. 3)upload it through usb-blaster by "active programming" (RUN/PROG button on PROG) 4)launch the eclipse's "flash programmer" 5)set up using the .sopcinfo 6)select the Elf file 7)a- if the RUN/PROG button is on RUN, everything seems ok until I turn the DE2 off and on again 7)b- if the RUN/PROG button is on PROG, I get an "error code 8" that I didn't found any documentation on. I tried to find on the web a "flash uploading for dummies procedure" but didn't. Thank you for your help and your patience!