Problems uploading ELF in flash on DE2

Hello,

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!