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tcmichals_home
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2 years ago

NIOS V/g version 1.0 vs 2.0 Atomic instruction

Using NIOS/g 1.0 the following code works: 00001604: lw a5,-20(s0) 00001608: lw a4,-24(s0) 0000160c: fence iorw,ow 00001610: amoswap.w.aq zero,a4,(a5) Using NIOS/g 2.0 an exception occurs when ...
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tcmichals_home's avatar
tcmichals_home
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2 years ago

OK, looking see link:

  • RV32IAZicsr (Pipelined) & RV32IZicsr (Non-Pipelined)

Another web has:

States:

  • Pipelined
    • Applies RV32IZicsr instruction set.
    • Supports five-stages pipeline datapath.
  • Non-pipelined
    • Applies RV32IZicsr instruction set.
    • Supports non-pipeline datapath.

This post is having the same issue.

So, Atomic is not supported? Or is it?

  • tcmichals_home's avatar
    tcmichals_home
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    2 years ago

    according to the toolchain.cmake generated by niosv-bsp-editor there is -march=rv32ia this should be rv32i if the processor does not support Atomic. Using this option the code now works.