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Altera_Forum's avatar
Altera_Forum
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19 years ago

Setting breakpoints in SSRAM

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

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    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