EBBR Notes 2025.06.18

Attendees

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

Agenda

• Summary of the investigations for pull request #141 ("All runtime services optional after ExitBootServices()")
  • Let's decide if we drop it completely.
• If time permits: cleanup of old issues and pull requests?

Notes

• A few issues and pull requests were revisited (including #141), and, in some cases, closed.

Raw notes

• Dropping pull request #141 ("All runtime services optional after ExitBootServices()")
  • Heinrich: let's drop it
• Old issues scrub
  • EFI_DT_FIXUP_PROTOCOL #68
    • Heinrich: more implementations nowadays
    • Best place would be UEFI
    • Let's close it.
  • Minimum sizes an OS can expect from the firmware #77
    • Microsoft and/or BBSR: 128KiB storage, 64KiB variables
    • Those are U-Boot defaults now
    • Relationship with UEFI Secure Boot and dbx
    • Keep it some more
  • clarify location of firmware for removable storage #113
    • "In both cases, the recommended boot sequence is to first search for firmware in a dedicated firmware partition, and second search for firmware in the ESP."
    • Makes sense only when firmware capable of doing both
    • Drop the sentence? (fix the issue)
  • Keep formatting issues #127 & #128 for now
  • Clarify section 4.2. Firmware Partition Filesystem #133
    • Grant's comment: "drop the shared storage option entirely"
    • Close this issue
• Old pull requests scrub
  • Recommend usage of partition type GUIDs to find firmware #106
    • No consensus reached: let's close it
  • Recommend psci node under firmware #134
    • not clear if this belongs to EBBR; let's drop it

Links

• https://github.com/ARM-software/ebbr/pull/141
• https://github.com/U-Boot-EFI/EFI_DT_FIXUP_PROTOCOL/blob/master/references.rst