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JTAG fix for shuttle#17

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Jeremy-Ryan-Mills wants to merge 2 commits intoucb-bar:masterfrom
ucb-ee194-tapeout:jtag_debug
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JTAG fix for shuttle#17
Jeremy-Ryan-Mills wants to merge 2 commits intoucb-bar:masterfrom
ucb-ee194-tapeout:jtag_debug

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@Jeremy-Ryan-Mills Jeremy-Ryan-Mills commented Apr 5, 2026

Originally, JTAG hung when trying to connect with openocd. We added the following edits in the Shuttle core to fix this and tested it in sim and on FPGA:

  • Additional logic to flush the pipeline and handle jalr instructions in debug mode
  • Single-step logic
    Additional credit to Christian (@chrisrq) and Alonzo (@Uhhlonzo) for debugging this with me.

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