System ID Problem - N/A

Hello,

i am trying to run a ddr2-example on a Stratix III DE3 board.

what i did:

-i changed the device in quartus to ep3sl150f1152c2 in the demo it was ep3sl150f1152c3 but the chip on the board is with speedgrade 2

- i started sopc builder and compiled the nios system

- then i compiled the design and loaded it to the fpga

- in nios i make a new projekt (helloworld) with the sopcinfo-file which was generated.

- when i want to upload it i get the error:

--- Quote Start ---

Actual system ID not found on target at base address

--- Quote End ---

in the System ID Properties the System ID is N/A al well as the timestap.

what is the problem? thanks in advance...

EDIT:

i tried to use the original setup with the ep3sl150f1152c3 setting (which is wrong)

when i configure it to the fpga and than build a project with nios i can programm it to the fpga. So why does this work?

but The testprogram doesnt work..

in the console there is folowing:

===== DE3 DDR2 Test Program =====
DDR2 Clock: 266.6 MHZ
DDR2 Size: 256 MBytes
==========================================================
Press any BUTTON to start test  

pressig the button does nothin, after a while the console is receiving strange chars and the leds are getting some random on/off

so why does can i play the software to nios in one case and not in the other and why does it "work" with the wrong fpga configutration?