Stratix DSP kits 1S25 and 1S80

First of all this has nothing to do with the design I downloaded, because although you base your design on that code, the code simply tells the IDE what sof file to load when programming the flash. If you change the board type you will likely see the exact same problem, but you cant program the flash ofcourse. Try it.

I have seen this problem before and it is a flaw in pre nios 1.1 versions. There has been discussions about this on niosforum with contributions from some of the altera developers. You could search for it, (I tend to spend too much time when trying to use the search utility on nios forum, so please try for yourself). What I recall for cure is that you should make sure you use the latest software: nios 1.1 and quartus 4.2 sp1.

For other reasons, dont try to use nios 1.0 and q4.2 or nios 1.1 and quartus 4.1.

I think to recal that if you include the jtag-uart or rs232 uart the problem goes away. Something in that direction, but I am not sure.

I do recall though that the design worked as long as the additional pin was tied to Vcc (or was it gnd http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/dry.gif )

hope this helps.

Maybe someone else could give a more specific hand?