That is defined behavior in TCG PC Client Platform PM Profile (PTP) Specification


in Table 5 — PCR Initial and Reset Values


PCR0: 0000…..03, the ending “3” indicates locality.


From: tpm2 [] On Behalf Of Scheie, Peter M
Sent: Friday, August 31, 2018 9:29 PM
Subject: [tpm2] In emulator, why do PCRs 17-22 default to ff?


In the emulator, PCRs 0-16 and 23 default to 00 when the emulator is started.  But PCRs 17-22 default to ff.  Why is that?  Why not have them all be 00 or all be ff?  (Actually, I notice PCR0 is 03 upon startup; why is that?)