Verify failed between address 0x4011800 and 0x401181F

If the reset vector is inside the epcs_flash_controller, I don't think your program image should have any code for that address.

Something will have gone wrong inside all the 'magic' that attempts to make building a loadable image easy.

The images I build are so dissimilar from those the IDE generates I couldn't even comtempate beating it into submission.

Not only that, we download the code from system filestore - so the system used to compile to code doesn't need any of the Altera software installed - just gcc for nios2.