nios2 processor non responsive

Hello everyone.

I have created a design in SOPC builder with a NIOSIIf core which has a MMU. The SOPC file for the same is here (https://docs.google.com/open?id=0b8b-p7uizx09ztfmnwi0ntqtmdcyni00mty5ltlkotutmwnkyjq5zgi1m2mw).

Furthermore, I am using a DE1 board so I have used the pin assignments that came with the CD. I instantiate the core in a BDF file and then attach pins to it. The entire project contents can be found here (https://docs.google.com/open?id=0b8b-p7uizx09otu2njewyzatndflny00mdg0lthlzjctmzrkodyyngm3mjc0). The quartus version is 11.1sp1.

After I instantiate I burn the design using nios2-configure-sof and then later I try to download the image of uboot which I created as described in the wiki (http://www.alterawiki.com/wiki/dasuboot). On issuing the following command:

nios2-download -g u-boot

I get the following errors:

Pausing target processor: not responding.
Resetting and trying again: FAILED
Leaving target processor paused

On searching the net, the most I could get was that the reset pin gets asserted and hence the processor is never able to get out of reset. But in my own case, I have connect the reset_n input pin to KEY[0] the first pushbutton switch which when pressed connects the pin to ground.

Some people were also told to try the design using an e core instead of an f core here (http://www.alteraforum.com/forum/showthread.php?t=32665&highlight=nios2+processor+non+responsive). By the way, is the DE1's 8MB of SDRAM that insufficient even for downloading the u-boot image? Which is hardly 530 KB. Then again it is not even getting downloaded in the first place

Some people said that it is time limited for the f version...which even my sof tells me..but this happened the very first time and then it never changed..

Some fellows were trying to use C++ libraries while creating a BSP. Where should I start looking?? Itd be great to hear some tips, pointers from people here.

Regards,

Aijaz