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SubjectRE: [tpmdd-devel] [PATCH] tpm: add documentation for sysfs interfaces
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Hi Kent,

> > > +What: /sys/class/misc/tpmX/device/active
> > > +Date: April 2006
> > > +KernelVersion: 2.6.17
> > > +Contact: tpmdd-devel@lists.sf.net
> > > +Description: The "active" property prints a '1' if the TPM chip is accepting
> > > + commands. An inactive TPM chip still contains all the state of
> > > + an active chip (Storage Root Key, NVRAM, etc), and can be
> > > + visible to the OS, but will not accept commands.
> >
> > Hmm, I know this is a tricky one (enabled/activated).
> > maybe this would be better as:
> > - visible to the OS, but will not accept commands.
> > + visible to the OS, but will only accept a restricted set of commands.
> > + See TCG specification(...) for more information.
>
> Yeah that's more accurate. I'm just inclined to point to the design
> principles and structures spec here unless you have a better idea. Both
> have enabled/activated info scattered throughout them. Sigh. :)
>

Maybe refer to TPM Main - Part 2 TPM Structures_v1.2_rev116 - Section 17
The table of ordinals there has a special column named 'Avail Disabled' and 'Avail Deactivated' which describes quite good which commands can be used and which not.

Thanks,
Peter


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