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TPM v1.2 has a limitation in that only a single monotonic counter can be incremented between reboots [1]. So in the event we are using HOTP monotonic counters, we need to reference those for the Heads rollback counter when we update file signatures in /boot, otherwise the increment stage at kexec-sign-config will fail since at each boot, the HOTP monotonic counter has already been incremented. [1] https://projects.csail.mit.edu/tc/tpmj/UsersGuide.html#inccounter