We are seeking for ideas with the following issue we have on Cyclone V.
We have a project in development where adding Altera PIO (and sometimes other MM-slaves) breaks the ability to load ELF into NIOS memory (both DDR and on-chip):
$ nios2-download -g --instance 0 --device 1 --cable USB-Blaster[USB-0] c13_commit_C3.elf
Using cable "USB-Blaster [USB-0]", device 1, instance 0x00
Pausing target processor: not responding.
Resetting and trying again: FAILED
Leaving target processor paused
The NIOS is visible on JTAG chain and the memory map is exactly the same as in the working version.
How can such JTAG download problem be debugged?
Error Running Nios II Project: Downloading ELF Process failed
If the Nios II processor’s
port is not connected to all program memories (memories to which the .elf file is downloaded) the software project fails to run on Nios II hardware.
Failure to connect
to all program memories is a design error that the Nios II Software Build Tools (SBT) does not detect.
to all program memories.
Please make sure you have connected Nios debug reset output back to nios reset input QSYS.
See figure 2 in following document as example:
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