RAM and FLASH shared bus don't worked

Hi,

Are you declare your flash as a cfi (Common Flash Interface) in SOPC ? 80% YES

I don't know Pipeline Bridge.

I could suggest you to connect as this :

Nios Cpu <--> Tristate Bridge <--> Flash
                               |-> SRAM

If you are not afraid with Nios2-terminal, you can "debug" with command-line executable like

nios2-terminal, nios2-download, nios2-flash-programmer...

8bit or 16bit Flash are transparent for booting method. It just tell SOPC how to handle the flash. Transparent for software.

Try something like nios2-flash-programmer --debug (read help files) andtell us what you get.

Regards.