Re: [tboot-devel] [tpmdd-devel] TPM driver problem on GM45

[Ross P. <Ros...@ci...>]

I wanted to ask since there is something that doesn't quite make sense
here. The Linux tpm_tis driver clearly uses MMIO to access the TPM
registers so it should work as does any other OS code. Also if the
Windows OS can access the iTPM then Linux should arguably also be able
to. So I guess it must be some difference in the iTPM interface that
makes the standard tpm_tis (presumably 1.2 compliant) driver just not
work. Is that accurate?

> > It is not possible to use any TPM Linux driver on these platforms.

I don't understand why that would be the case. There may be none that
currently are able to but they should be able to be modified to access
it (just as Windows drivers access it).

Thanks
Ross

-----Original Message-----
From: Cihula, Joseph [mailto:jos...@in...] 
Sent: Monday, December 01, 2008 5:30 PM
To: Seiji Munetoh; Marcin Obara
Cc: tbo...@li...; tpmdd-devel
Subject: Re: [tboot-devel] [tpmdd-devel] TPM driver problem on GM45

> From: Seiji Munetoh [mailto:sei...@gm...]
> Sent: Monday, December 01, 2008 2:24 PM
>
> On Mon, Dec 1, 2008 at 4:53 PM, Marcin Obara
> <mar...@us...> wrote:
> > 2008/12/1 Seiji Munetoh <sei...@gm...>:
> >> 2008/11/28 Marcin Obara <mar...@us...>:
> >>> Linux is not supported by iTPM on these mobile platforms.
> >>> iTPM on these platforms will work only with Windows OS-es.
> >>
> >> So, do we need special driver to access the iTPM?
> >
> > It is not driver issue. It is platform design.
> > iTPM on these (mobile) platforms was designed to work only with
> > Windows OS-es. It is not possible to use any TPM Linux driver on
these
> > platforms.
> > iTPM on other (desktop) platforms should work with standard Linux -
> > tpm_tis driver.
>
> So we can't use tboot & xen also on these platforms:-(
>
> thanks,
> Seiji

(cross-posting to tboot-devel since this question concerns that project)

tboot will work fine on these systems, since it accesses the TPM
directly through its MMIO interface.  You will just have to use a
non-Linux environment and tools to provision the TXT LCP and tboot
policy indices.

Joe

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