On Mon, Oct 01, 2012 at 09:17:28AM +0000, peter.hu...@infineon.com wrote:
> Hi Jason,
>
> > The TPM will respond to TPM_GET_CAP with TPM_ERR_INVALID_POSTINIT if
> > TPM_STARTUP has not been issued. This will result in the TPM driver
> > failing to load and no way to recover. Detect this and automatically
> > issue TPM_STARTUP.
>
> > This is for embedded applications where the kernel is the first thing
> > to touch the TPM.
>
> Thanks for working on this.
> I also thought about this scenario quite often.
>
> Shouldn't we then also add a TpmStartup(ST_STATE) in case of a resume?
> rc=GetCapability()
> if(rc==INVALID_POSTINIT)
> tpm_transmit ("TPM_STARTUP(ST_STATE)")...
I'm not familiar enough with how the power management flow works with
the TPM to do this. I don't think that can be the general case
because:
3. If stType = TPM_ST_STATE
a. If the TPM has no state to restore, the TPM MUST set the internal
state such that it returns TPM_FAILEDSELFTEST to all subsequent
commands.
So you need to know a save state exists in the TPM before attempting
the command?
Would you agree that CLEAR is appropriate for an initial driver
attach on probe?
Jason
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