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List: tpmdd-devel
Subject: Re: [tpmdd-devel] TPM in Dell Latitude E7440
From: Peter Huewe <peterhuewe () gmx ! de>
Date: 2014-02-19 15:49:41
Message-ID: ce9fc851-edbb-4f22-9a95-521efe781cc3 () email ! android ! com
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Hi,
Yes, we had a similar issue some time ago, unfortunately without a complete patch.
Is the device id and chip version identical?
Thanks,
Peter
Philipp Kern <pkern@google.com> schrieb:
> Hi,
>
> On Wed, Feb 19, 2014 at 4:16 PM, Philipp Kern <pkern@google.com> wrote:
>
> > so I have a E7440 and tried to use its TPM. Sadly even with 3.13 this
> does
> > not work, all operations time out. Apparently the TPM does not
> communicate
> > the right timeout values. I end up with "12000 12000 12000 12000
> > [original]". This is way lower than what the standard specifies and
> more
> > importantly it does not work. tpm_version tells me it's an ATML one
> with
> > Chip Version 1.2.41.1, Spec Level 2 and Errata Revision 3
> (Manufacturer
> > Info 41544d4c). I am not sure what the 12 is standing for, but given
> the
> > existing logic that already needs to scale the value by 1000 if it is
> too
> > low, I'm not surprised by anything.
> >
>
> crawling the archives after having found the workaround I see that
> http://sourceforge.net/mailarchive/forum.php?thread_name=20131115185207.GA19355%40obsidianresearch.com&forum_name=tpmdd-devel
> describes
> almost the same thing I see here. Maybe we could fix it for those
> Atmels
> once and for all? ;-)
>
> Kind regards
> Philipp Kern
>
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> Managing the Performance of Cloud-Based Applications
> Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
> Read the Whitepaper.
> http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk
>
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>
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> https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
---
Sent from my mobile.
[Attachment #5 (text/html)]
<html><head></head><body>Hi,<br>
Yes, we had a similar issue some time ago, unfortunately without a complete \
patch.<br> <br>
Is the device id and chip version identical?<br>
<br>
Thanks,<br>
Peter<br><br><div class="gmail_quote"><br>
<br>
Philipp Kern <pkern@google.com> schrieb:<blockquote class="gmail_quote" \
style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); \
padding-left: 1ex;"> <div dir="ltr"><div class="gmail_extra">Hi,<br /><br /><div \
class="gmail_quote">On Wed, Feb 19, 2014 at 4:16 PM, Philipp Kern <span \
dir="ltr"><<a href="mailto:pkern@google.com" target="_blank" \
class="cremed">pkern@google.com</a>></span> wrote:<br />
<blockquote class="gmail_quote" style="margin:0px 0px 0px \
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div \
dir="ltr"><div>so I have a E7440 and tried to use its TPM. Sadly even with 3.13 this \
does not work, all operations time out. Apparently the TPM does not communicate the \
right timeout values. I end up with "12000 12000 12000 12000 [original]". \
This is way lower than what the standard specifies and more importantly it does not \
work. tpm_version tells me it's an ATML one with Chip Version 1.2.41.1, Spec \
Level 2 and Errata Revision 3 (Manufacturer Info 41544d4c). I am not sure what the 12 \
is standing for, but given the existing logic that already needs to scale the value \
by 1000 if it is too low, I'm not surprised by anything.<br />
</div></div></blockquote><div><br /></div><div>crawling the archives after having \
found the workaround I see that <a \
href="http://sourceforge.net/mailarchive/forum.php?thread_name=20131115185207.GA19355%40obsidianresearch.com&forum_name=tpmdd-devel" \
class="cremed">http://sourceforge.net/mailarchive/forum.php?thread_name=20131115185207.GA19355%40obsidianresearch.com&forum_name=tpmdd-devel</a> \
describes almost the same thing I see here. Maybe we could fix it for those Atmels \
once and for all? ;-)</div>
<div><br /></div><div>Kind regards</div><div>Philipp Kern</div></div></div></div>
<p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid \
#000"></p><pre class="k9mail"><hr /><br />Managing the Performance of Cloud-Based \
Applications<br />Take advantage of what the Cloud has to offer - Avoid Common \
Pitfalls.<br />Read the Whitepaper.<br /><a \
href="http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk \
">http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk</a></pre><p \
style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre \
class="k9mail"><hr /><br />tpmdd-devel mailing list<br \
/>tpmdd-devel@lists.sourceforge.net<br /><a \
href="https://lists.sourceforge.net/lists/listinfo/tpmdd-devel">https://lists.sourceforge.net/lists/listinfo/tpmdd-devel</a><br \
/></pre></blockquote></div><br>
---<br>
Sent from my mobile.</body></html>
------------------------------------------------------------------------------
Managing the Performance of Cloud-Based Applications
Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
Read the Whitepaper.
http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk
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