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Composable Custom Extensions TG Meeting
Darius Rad `<[email protected]>`$\newline$Jan Gray `<[email protected]>`
10 October 2024
beamer_presentation
Warsaw

Disclosures

https://lf-riscv.atlassian.net/wiki/spaces/HOME/pages/16154892/Meeting+Disclosures

Agenda

  • Upcoming meetings
  • Development plan
  • Request for volunteers
  • Requirements discussion

Upcoming meetings

  • RISC-V Summit, Santa Clara
    • Monday, 21 October, 11 am - noon, Room 207 (in person only)
  • Regular meetings to continue
    • 24 October
    • 7 November

Development plan

  • Organized as Work Breakdown Structure (WBS)
  • Hierarchy of work items
  • Tracks owner, time estimates, progress
  • Used to establish timeline for freeze, for ratification plan
  • If interested, review and share feedback on list

Request for volunteers

  • QEMU (simulator support)
  • binutils, gcc (ABI support)
  • RISC-V ACT
  • RISC-V SAIL
  • Unified Discovery
  • OpenSBI
  • Linux
    • devicetree
    • ACPI
    • context switch
    • user ABI (hwprobe, prctl, sysfs)
  • glibc
  • hardware
    • ISA
    • logic interface

Requirements discussion

  • Main open topics
    • Extension state (one/many, hart state or not)
    • Opcodes (all custom opcodes or subset, one/multiple ranges)
    • Hotpluggable extensions
    • Logic interface capabilities
  • Need to provide time estimate for ratification plan
  • Intend to defer decisions until later
  • Hope that starting development can inform discussion and decision
  • Lack of volunteers for tasks will end up in features being eliminated