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Is the P550 RVA22? Here's the ISA string in Linux. Seems like a lot is missing. rv64imafdch_zicsr_zifencei_zba_zbb_sscofpmf

• brucehoult 2y ago
  Oops! You're right. They only claim RV64GBC https://www.sifive.com/document-file/p550-core-data-sheet https://www.sifive.com/document-file/p550-core-data-sheet Although that was at announcement in June 2022. SiFive have continuous improvement and quarterly updates, which is how the U74 in the JH7110 ended up with Zba and Zba that the FU740 (and I thin JH7100) doesn't have, but missed out on the L2 prefetcher that the next quarterly updata got. We do know that the Eswin chip has H, right?
  • brucehoult 2y ago
    Actually Eswin doesn't seem to claim B extension: https://www.eswincomputing.com/en/bocupload/2024/06/19/17187920991529ene8q.pdf https://www.eswincomputing.com/en/bocupload/2024/06/19/17187... But Intel Horse Creek did (and also was higher MHz, they said 2+ GH, but I think they demoed it at 2.2 at Hot Chips and were shooting for 2.4 in production): https://community.intel.com/t5/Blogs/Tech-Innovation/open-intel/What-s-in-store-for-the-latest-RISC-V-development-board/post/1448348 https://community.intel.com/t5/Blogs/Tech-Innovation/open-in... All will be revealed in 10 days or so.
    • camel-cdr 2y ago
      It should support rv64imafdch_zicsr_zifencei_zba_zbb_sscofpmf with version 0.6 of the H extension. The the confusion reguarding B probably comes from claimes of B support before ratification, where it wasn't clear that Zbs needs to be supported. See the discussion here: https://github.com/llvm/llvm-project/pull/122164#issuecomment-2580676443 https://github.com/llvm/llvm-project/pull/122164#issuecommen...