Downloading ELF Process Failed

[Altera_Forum]

Hello There, 

 I am trying to Download my simple "Hello World " Code on nios-ii but each time it says  "Downloading ELF Process failed", i have port the nios-ii processor on board, i am using Altera ESDK Board.  i have made little changes in processor block (Just add two-there signal as an input, which i am going to use in my C-Code as a interrupt) and compile the entire project, so till now there is no problem but when i port simple code it generate an error.  *Please see the Attached Error Message  Regards  kaushal

[Altera_Forum]

The first things to check when the CPU doesn't answer on JTAG are:[list][*]is the design properly constrained and does it meet all timing requirements[*]are all the clocks present and at the correct frequency (monitor the pll locked outputs)[*]is your reset signal correct, with the right polarity?[/list]What modifications did you do? Is it a custom component? Does the system work again if you remove it?

[Altera_Forum]

Hello daixiwen, 

 Thanking you for reply,  1. Yes Design Properly Constrained and meet all timing requirements 2. Yes clocks present and at correct frequency. 3. reset signal is also correct.  I have add a three inputs (Start, Load and 8 bit data), coming out from different hardware module.  i am trying to use these there input in my C-code...for holding and further forward these data in UDP format to other terminal.  if i redesign the entire nios-2 Processor with the same configuration and port simple "hello world" there is no issue and nios-2 generate "hello World".  Regards  kaushal

[Altera_Forum]

Are those hardware modules custom components? If you just disable them in SOPC builder instead of redesigning the whole system, are you able to connect to the CPU?

[Altera_Forum]

Hello Daixiwen, 

 Yes , I have add Customized Port (2 single bit port and one 8 bit bus port), i have assign interrupt to first two single bit port. disabling won't help me .....and still facing elf download failed issue.  regards Kaushal

[Altera_Forum]

You should try to make the smallest system possible that still has the problem, by disabling as much component as possible, and then compare it with a system that works. Hopefully it will give you an indication of where the problem comes from, as I don't have any other idea to give you right now...