[coreboot] SeaBIOS TPM support on Chromebook Acer C720

Stefan Reinauer stefan.reinauer at coreboot.org
Tue Jul 15 21:37:37 CEST 2014

* Stefan Berger <stefanb at linux.vnet.ibm.com> [140714 12:14]:
> The TPM is successfully detected but sending TPM_Startup(ST_Clear)
> to the TPM fails since either coreboot or some other firmware seems
> to already have initialized the TPM, which is fine, and also
> extended PCR 0 with at least one hash. Ideally there would be a TCPA
> ACPI table containing information about what was logged, since
> otherwise the state of the PCR seems not that useful. SeaBIOS's TPM
> extensions could then also use this TCPA table and add its own logs
> into it along with extending PCRs in the TPM. So, in this case the
> TPM SeaBIOS extensions don't log anything and adding additional ACPI
> tables to the existing coreboot tables seems 'impractical'. I was
> wondering if coreboot could add such a table if a TPM was found to
> be present?

Sure that would be great. Someone looked into this in 2008 but I don't
think progress ever hit our tree..


Patches would be very welcome!


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