OE4T Meeting Notes 2025‐12‐12 - OE4T/meta-tegra GitHub Wiki

Attendees

Work in progress at https://trellis-logic.github.io/meta-tegra/master/
- Remaining tasks:
  - Fix a few remaining issues with branch switcher.
  - Import all wiki content into each LTS branch.
  - Prepare PRs.
hledger - See if there’s a trick available for branch switching at https://hledger.org/dev/hledger.html
Suggestion to remove mdbook and src subdirs
Update issue template to ask to include docs as a part of pull request change.
May want to add a project in github for open tasks related to documentation.

On Jetpack 5.1.3, had that implemented. Now working on 5.1.5. Have a commit working on top of EDK2 nvidia on 5.1.5 upstream from a month-ish ago.
Building the EFI file into the UEFI CPU bootloader. The thing in the ESP partition still exists but UEFI never tries to load it.
Boots and does the right things.
Path required to EDK2, non-nvidia repo to make capsule updates work.
Stock nvidia and capsule stuff expects active boot option is device with ESP partition.
Library used to figure out which device has the esp partition handle.
Setup as a patch you would apply, doesn’t register anything else.
Need to get capsule update working and check the box that I could send it. Could set that up as patches within EDK tegra repo, do yocto config option to apply.
Could add build flag supported by EDK2 directly. Probably still need config option in yocto recipe anyway.
Can support field update
Added test to dd over the esp partition after adding to both slots, still boots successfully.
Upstream meta tegra UEFI also gets mad if ESP can’t be mounted. Don’t actually need it to be mounted for UEFI variables, can use SYSFS interface.
ESP AGX Xavier platforms do require ESP partition mounts.
Only tested this on Orin AGX thus far.
Not doing initrd flashing, assume that will still work but possible that it won’t.

Linux Yocto kernel is booting, a few oddities, but no big concerns.
Currently fighting capsule updates. Trying to pull into another layer and bring in R35.
Mix of flashing and capsule generation scripts between the two.
Capsules are built and brought over, sees and installed by UEFI.
Messes up something in BCT. Boots but doesn’t switch the slot. Seems like something is overwritten in BCT. Might be falling back to backup copy.
Having trouble geting OPTEE building.
Might be a clue in the implementation of tegra boot tools.