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12367 Discussions

Nios using onchip memory resets continuously

Altera_Forum
Honored Contributor I
836 Views

I am using a small footprint EP4CE6 FPGA with NIOSII built using 20KB on chip memory. Using Eclipse IDE I built the "small hello world" example as a starting point. My problem is that when I add anything more than a simple alt_printf statement, the cpu continuously resets itself. 

 

I think it may be because I am not setting up the complier correctly. The instructions refer to the old NIOS IDE. I would like to know how to set these using the ECLIPSE IDE. 

- Define the preprocessor option ALT_NO_INSTRUCTION_EMULATION 

- Set Periodic system timer and Timestamp timer to none 

- Set Max file descriptors to 4 

- Uncheck Clean exit (flush buffers) 

 

and any other settings you think is necessary to run NIOS CPU with on-chip memory only. 

 

Thanks,  

nathan
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2 Replies
Altera_Forum
Honored Contributor I
48 Views

How large is your onchip memory? I've seen this happen when I had too small of memory.

Altera_Forum
Honored Contributor I
48 Views

 

--- Quote Start ---  

How large is your onchip memory? I've seen this happen when I had too small of memory. 

--- Quote End ---  

 

20KB. I generated Qsys system as per the NiosII hardware Development tutorial.
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