On Sat Mar 23, 2024 at 8:40 PM EET, Jarkko Sakkinen wrote: > > Would it be worth clarifying here that one of those interfaces is > > defined in the Mobile TPM specification, which also refers to its > > interface as the CRB interface. In the past, this has caused great > > confusion when working with individuals from the embedded community, > > e.g., Arm. The Mobile TPM CRB interface, which can also be found being > > used by some generations of AMD fTPM, is a doorbell style interface > > using general-purpose memory. I would also point out that the Mobile TPM > > CRB interface does not provide for the concept of localities. > > I don't necessarily disagree but it is out of scope for this. I'm not > sure tho why "mobile" CRB would ever need that sort of separate > dicussion. > > Some CRB implementations have localities some don't, and also fTPM > implementations on x86 vary, no need to state that separately for > mobile. I.e. the variance exist but it is not "mobile" specific. E.g. when I developed tpm_crb in 2014 at that time Intel PTT only had a single locality (AFAIK later multiple localities were added to support TXT). In all cases this tpm_crb discussion is not really part of tpm_tis discussion. BR, Jarkko
