Recommend SMCCC >= 1.1 - Githubissues

ARM-software / ebbr

Embedded Base Boot Requirements Specification

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Recommend SMCCC >= 1.1 #116

Closed vstehle closed 6 months ago

vstehle commented 7 months ago

This is to follow up with the EBBR call of Feb 12.

As Etienne mentioned during the call, SMCCC_VERSION discovery must happen through PSCI_FEATURES when an SMCCC <= 1.0 is implemented. Recommending >= 1.1 does not solve this completely but gives a sane advice to implementers, at least.

Some more context:

Arm BBR does require SMCCC but there is no requirement on the version. No version before 1.1 is mentioned.
TF-A does implement SMCCC version >= 1.1 since v1.5 in 2018.

xypron commented 6 months ago

The change looks good to me.

Looking at "Future versions of this specification will only allow PSCI and SMCCC, and they should be implemented in all new designs." When will we make that change?

vstehle commented 6 months ago

Thanks @xypron for the review. Approved during EBBR call of 26 Feb.