warning: Unable to reach (null) (at 0x00091c78) from the global pointer (at 0x0007e4d0) because the offset (79784) is out of the allowed range, -32678 to 32767.

Hi,

Always Intel recommends to set the exception vector to On-chip ram to get a better performance of the interrupts actions.

I see you are using the on-chip as a reset but DDR as exception. I recommend you to follow the following document:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/nios2/edh_ed_handbook.pdf#page=%20218

Regards,