EBBR Notes 2018.05.10

10 May 2018

Attendees

• Ryan Harkin (Linaro)
• Grant Likely (Arm)
• Bill Mills (TI)
• Tom Rini (Konsulko)
• Peter Robinson (Red Hat)
• Daniel Thompson (Linaro)
• Dong Wei (Arm)
• Leif Lindholm (Arm)
• Udit Kumar (NXP)

Agenda

• Action item review
• Any other business

Notes

Action Items Review

• Recommended policy on shared devices (Bill)
  • Conversation occurring on mailing list - discussion still needed
• Write policy on shared media (Leif)
  • Conversation occurring on mailing list - no consensus yet.

Other Business

• Leif: What platforms are we trying to support? The behaviour today, or what we want?
  • Daniel: Persistent variables behaviour (whether or not variables are shown on when setVariable() is not available at runtime) seems to be all
  • Leif: Should have guidance notes on how we expect operating systems to behave
• Bill: Still need to talk about defining how to share eMMC

Action Daniel to create a scratchpad roadmap of what goes in Level 0, 1, 1+

• Level 1/1+: EBBR can impose requirements on the boot ROM?
• Level 1/1+: DT overlays (scope depends on best technical approach to apply/unapply them, could come into scope if OS is provided an interface to do this)

Bill's Meta Topic: What is the scope of what is in the document?

• Is it just the contract between the OS and the firmware?
• Or is it okay to have examples in the document?
  • Leif: totally okay with that
  • Grant: I'm totally okay with that too

Partitioning:

• MBR is back - complete consensus
• Some disagreement about protective partitions
• ESP containing firmware [level 1+ ;-) ] allows live boot images even for boards where OS and firmware reside on the same removeable media.
• Level 0: Board specific EBBR SD card + boot generic OS installer from (really) removeable media
• Level 1: Generic EBBR SD card for multiple boards + EFI netboot application ;-)