Sdtrig: Clarify that tinfo.version is a global constant, not per-trigger #1081
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Nov 8, 2024
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The confusion is that "the version of the Sdtrig extension implemented" might change dynamically because part of the trigger module might support 0.13 and another part supports 1.0? |
The purpose of "tinfo.version" field is apparently to describe the version of the whole Sdtrig implementation. That is, it is a constant unaffected by the current value of tselect CSR. Judging form the original commit that introduced it (0374fd6) and from the related mailing list discussion (https://lists.riscv.org/g/tech-debug/topic/96888390). However, the sentences `This register provides access to the trigger selected by tselect. The reset values listed here apply to every underlying trigger.` leave certain room for interpretation that "tinfo.version" is a per-trigger constant, not a global one, and could therefore change depending on "tselect". Remove this ambiguity by rewording the description of "tinfo" CSR and "tinfo.version" field.
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Yes. The sentence |
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The purpose of "tinfo.version" field is apparently to describe the version of the whole Sdtrig implementation. That is, it is a constant unaffected by the current value of tselect CSR. Judging form the original commit that introduced it (0374fd6) and from the related mailing list discussion
(https://lists.riscv.org/g/tech-debug/topic/96888390).
However, the sentences
This register provides access to the trigger selected by tselect.The reset values listed here apply to every underlying trigger.leave certain room for interpretation that "tinfo.version" is a per-trigger constant, not a global one, and could therefore change depending on "tselect".
Remove this ambiguity by rewording the description of "tinfo" CSR and "tinfo.version" field.