Hi Ken,
On executing the tpm_version program, this is the output which I get.
# tpm_version
TPM 1.2 Version Info:
Chip Version: 1.2.66.6
Spec Level: 2
Errata Revision: 3
TPM Vendor ID: ATML
TPM Version: 01010000
Manufacturer Info: 41544d4c
Is this sufficient to identify the TPM firmware version?
Thanks and Regards,
Pritha.
On 6 March 2017 at 19:33, Ken Goldman <[email protected]> wrote:
> On 3/6/2017 7:55 AM, Chris Hawkins wrote:
> > Pritha,
> >
> > What I believe you are observing is that the PCRs are being reset on
> > boot, but are being extended as expected by the BIOS/UEFI (PCRs 0-7) and
> > the OS (PCRs 8-15). It's rare to find a platform that can enable and
> > activate a TPM but it's not configured to extend PCRs on boot. GRUB is
> > also TPM aware, and will also extend PCRs. Because your boot environment
> > rarely changes, the extended PCR values will generally be identical
> > after every boot. Update a BIOS revision, and you'll see these change.
> > Not many other things will affect a change. These unchanging values may
> > imply that the PCRs are never being reset, but they almost certainly
> > are. They are just being extended by measurement of the same, unchanging
> > things, on every boot.
>
> I don't think that's the issue. Note that the poster extended PCR0,
> rebooted, and got the new value. If it was the BIOS/UEFI, it would go
> back to the old value.
>
>
>
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