I have system with TPM 1.2 installed on it. Currently, I'm using tpm-tools to initialize this TPM. With the command

tpm_extendpcr -p 23 tpm-pcr.key

I can write a value into a PCR which works fine.

After rebooting the system, the corresponding PCR register is empty again. Is there a way that can help me to permanently write a value into a PCR register?


All PCR's are inherently volatile. The only way to "permanently" write a value in one is to configure your boot process to perform the write at every boot.

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