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NikoR's avatar
NikoR
Icon for Occasional Contributor rankOccasional Contributor
6 years ago
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Warning: "No matching role found for nios2_gen2_0_custom_instruction_master_multi_xconnect"

The attached .qsys file contains a Nios2 with a "Floating Point Hardware 2" connected. When generating I get the following warnings: Warning: roots_test: "No matching role found for nios2_gen2_0_...
  • BoonBengT_Altera's avatar
    BoonBengT_Altera
    6 years ago

    Hi @Nikolay_Rognlien,

    Thank you for your patients, hope you are doing well.
    After some investigation, per my understanding it seem that those interface (i.e. instruction pending and estatus) seems to be belonging to the master component, and possible just some signal mismatched between the master and slave.
    Hence I would assume that the warning are just indicating that those interface in master are not being mapped to any slave, which we might be able to safely ignore.
    Just to understand further, what are the purpose of using the FPH2 in the design?

    Warm Regards.

BoonBengT_Altera's avatar
BoonBengT_Altera
Icon for Moderator rankModerator
6 years ago

Hi @Nikolay_Rognlien,

The steps mention above are for the warning shown in the qsys 'Root fuction requires ram initialization'. Apologies as missed out the second part of the question.
For the mention warning during HDL generation, I am suspecting that you are missing the CRC custom instruction. (as shown in page 51)
For the custom instruction creation, perhaps you can refer to the design example here. (https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_nios2_custom_instruction.pdf#page=23&zoom=100,0,0)

Warms Regards

  • NikoR's avatar
    NikoR
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Hi.

    Adding the crc custom instruction as described in chapter4 and then shown in figure 23 on page 51 did not help.

    I also played with adding a custom_instruction_slave_translator between Nios and the fphw2 but that only introduced more similarwarnings.

    It seems like the hint here is the _multi_xconnect which is an invisible thing in between somewhere...

    Any more ideas?

    /Nikolay

    • BoonBengT_Altera's avatar
      BoonBengT_Altera
      Icon for Moderator rankModerator
      6 years ago

      Hi @Nikolay_Rognlien,

      Thank you for your patients, hope you are doing well.
      After some investigation, per my understanding it seem that those interface (i.e. instruction pending and estatus) seems to be belonging to the master component, and possible just some signal mismatched between the master and slave.
      Hence I would assume that the warning are just indicating that those interface in master are not being mapped to any slave, which we might be able to safely ignore.
      Just to understand further, what are the purpose of using the FPH2 in the design?

      Warm Regards.

      • NikoR's avatar
        NikoR
        Icon for Occasional Contributor rankOccasional Contributor
        5 years ago

        Ok, thanks for your explanation.

        The FPH2 is needed to support the floating point square root function....