[coreboot] SeaBIOS TPM support on Chromebook Acer C720

[Charles Devereaux]

Hello

Did anyone try to use TPM on the X60? There's a tpm chip, but I can't make
it work (cf
http://www.grounation.org/?post/2008/07/04/8-how-to-use-a-tpm-with-linux)

On Tue, Jul 15, 2014 at 3:37 PM, Stefan Reinauer <
stefan.reinauer at coreboot.org> wrote:

> * 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..
>
> http://www.coreboot.org/pipermail/coreboot/2008-November/042406.html
>
> Patches would be very welcome!
>
> Stefan
>
>
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