Hi Francois,

I'd be happy to know more about what you see as TFA LTS: exact scope, number of versions, duration, operational commitments (zero-day...). Do you have other firmware LTS needs?

Agree. That’s precisely what I was hinting to Varun, when mentioning concrete requirements for the LTS scheme.

Trusted Substrate is the aggregation of { TFA, OP-TEE, some TEE apps such as firmwareTPM, U-Boot }. Trusted Substrate effort is led by Linaro members and is going to be set up as a more open project.

First time I heard about it. Good to know, but I guess we'll need to discuss the intersection and collaboration with the Trusted Firmware project at some point. Having a LTS versioning scheme for the Trusted Firmware hosted projects should be theoretically either in the scope of the Project itself or, if the Board agrees, appointed to some other project/entity.

Our end goal is to enable unified, transactional, robust (anti-bricking, anti rollback) UEFI OTA on both U-Boot and EDK2.

Fair, but IMHO this has little to do with Arm Secure world software LTS releases (TF-A/Hafnium/OP-TEE/TAs, TF-M)...probably best to discuss aside, this is not in scope of what Varun is raising.

Thanks Matteo