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12748 Discussions

Setting breakpoints in SSRAM

Altera_Forum
Honored Contributor II
‎07-20-2006 04:53 PM
1,027 Views

I am due to receive a custom board soon which has just SSRAM and no SDRAM. We designed the board that way to reduce its complexity. 

 

I am trying to use my 2c35 based Nios dev board to simulate this custom board to let me develop the software before the custom board arrives. When I change the linker set-up to put my software in SSRAM rather than SDRAM everthing works fine, except that if I set breakpoints in the IDE then the processor does not halt at the breakpoints: it just carries on. 

 

The map file shows that everything has moved correctly from the SDRAM to the SSRAM. Is there something different about SSRAM that stops me setting breakpoints? Do I need to do something like change the Nios CPU configuration to use hardware breakpoints instead of software? 

 

As soon as I change the linker script to build the software to run from SDRAM the breakpoints start working again! This is rather odd. 

 

Any help appreciated, 

Mike
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Altera_Forum
Honored Contributor II
‎07-21-2006 12:43 PM
338 Views

The breakpoints are working in SSRAM now, although I am not sure what I have changed. I think the main thing was to reboot my PC, rebuild the FPGA design, rebuild my ecos library and rebuild my project to make sure everything was fresh. 

 

Mike
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