Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Downloading ELF process failed "how to remove unconstrained paths"

Hello mates, I read all the threads on the error "downloading ELF process failed". I am designing a basic system using Nios II core with LEDs and switches. I prepared a core and instantiat...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Thanks a lot for your reply. I now understand that unconstrained paths are not an issue here. Also, the altera_reserved_clk did not have problem.

I was able to create .sdc file and my circuit is working correctly now along with switches, LED and LCD as well.

Just one quick question, I followed the steps correctly but I did not use .BDF file while I got the output. When I have .vhd file as my top entity where I instantiate my processor then the circuit works correctly, whereas I get ".ELF download fail" error if I use .bdf as my top level entity. Could you please tell me why that happens?

Thank you.