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Oliver_I_Sedlacek's avatar
Oliver_I_Sedlacek
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2 years ago

NIOS2 doesn't automatically run from external RAM, how to debug

I really need my NIOS2 to autostart and run from off chip RAM using the bootloader copy method. The trouble is that despite many readings of the handbook and multiple rebuilds of the design the code ...
Embedded Applications Layer
tehjingy_Altera's avatar
tehjingy_Altera
Icon for Regular Contributor rankRegular Contributor
2 years ago

Hi


You could add the nios2 executable to the on chip ram in your design.

After you verify the behavior of your nios2 executable (.elf) using the debugger.

You could convert the elf into a hex file and place the hex file as an initialization file.

Using the command below to convert elf to hex

nios2-elf-objcopy -O ihex file.elf output_file.hex


Initialization of On chip ram

https://www.intel.com/content/dam/support/us/en/programmable/support-resources/fpga-wiki/asset03/hello-world-lcd-tutorial.pdf



Regards

Jingyang, Teh

Page 13


Oliver_I_Sedlacek's avatar
Oliver_I_Sedlacek
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2 years ago

Please read my question very carefully.

My code is fully developed and works. It does not fit in on chip RAM, it's just too big. It is therefore placed in external RAM and if I download and run from Eclipse it all works.

I need the system to run independantly so I read the documentation on using the bootloader to copy code from configuration memory to external RAM and then run.

It doesn't work and I don't know how to debug the problem.