EBBR Notes 2025.08.27

Attendees

• Heinrich Schuchardt (Canonical)
• Vincent Stehlé (Arm)

Agenda

• First look at pull request #144: PFDI requirements
• Pull request #145: Harmonize sections references titles
• Pull request #146: Bump references

Notes

• Pull requests #145 & #146, which were already reviewed on github, have been pushed.
• Some discussion on the PFDI pull request #144; it seems we could be more specific around the version required.

Raw notes

• Pull request #145: Harmonize sections references titles
  • Two reviewers already
  • -> push!
• Pull request #146: Bump references
  • This is reviewed -> push!
• First look at pull request #144: PFDI requirements
  • Spec version (1.0 alpX) is different from PFDI interface/firmware version (PFDI_VERSION Response)
  • Be more specific about which version we require in EBBR?
  • No impact to UEFI firmware / U-Boot
    • Implemented at EL3
    • Visible from operating system
    • U-Boot could call the tests for dev/safety
  • RISC-V has SBI mentioned in chapter 3
    • v0.2 has never been ratified
    • v3.0 is the current, ratified version
    • Heinrich to raise a pull request
    • v1.0 is good enough for booting & ratified
    • Gives a debug console
      • U-Boot uses it for early debug console
      • Switches to UART in driver model later on
      • See CONFIG_DEBUG_UART
    • Could introduce a new function in TF-A :)
      • In SMCCC? In PSCI?

Links

• https://github.com/ARM-software/ebbr/pull/144
• https://github.com/ARM-software/ebbr/pull/145
• https://github.com/ARM-software/ebbr/pull/146