Messages in this thread | | | Date | Fri, 05 Dec 2014 15:44:14 -0500 | From | Stefan Berger <> | Subject | Re: [tpmdd-devel] [PATCH v9 8/8] tpm: TPM 2.0 FIFO Interface |
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On 12/05/2014 10:01 AM, Peter Huewe wrote: >>> Am Donnerstag, 4. Dezember 2014, 06:55:18 schrieb Jarkko Sakkinen: >>>> From: Will Arthur <will.c.arthur@intel.com> >>>> >>>> Detect TPM 2.0 by using the extended STS (STS3) register. For TPM 2.0, >>>> instead of calling tpm_get_timeouts(), assign duration and timeout >>>> values defined in the TPM 2.0 PTP specification. >>>> >>>> Signed-off-by: Will Arthur <will.c.arthur@intel.com> >>>> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> >>>> + sts3 = ioread8(chip->vendor.iobase + TPM_STS3(1)); >>>> + if ((sts3 & TPM_STS3_TPM2_FAM) == TPM_STS3_TPM2_FAM) >>>> + chip->flags = TPM_CHIP_FLAG_TPM2; >>>> + >>>> >>> When loading tpm_tis force=1 with my tpm1.2 chip on a machine without bios >>> integration, it fets detected as a TPM2.0 chip :/ >>> >>> sudo rmmod tpm_tis >>> # modprobe tpm_tis force=1 >>> modprobe: ERROR: could not insert 'tpm_tis': No such device >>> # dmesg >>> [ 263.903828] tpm_tis tpm_tis: 2.0 TPM (device-id 0xB, rev-id 16) >>> [ 263.948049] tpm_tis tpm_tis: A TPM error (10) occurred continue selftest >>> [ 263.948120] tpm_tis tpm_tis: TPM self test failed >>> >>> >>> sts3 is reported as 0xff from my TPM1.2 >>> >> >> Hmm, >> my TPM2.0 chip also reports sts3 as 0xff (when loading with force=1 on a >> machine without bios integration) >> >> [ 307.095344] sts3 ff >> [ 307.095366] tpm_tis tpm_tis: 2.0 TPM (device-id 0x1A, rev-id 16) >> [ 307.140047] tpm_tis tpm_tis: A TPM error (256) occurred continue selftest >> [ 307.140056] tpm_tis tpm_tis: TPM self test failed > > You are reading "sts3" - before requesting the locality and thus it returns 0xff for a TPM20 chip as well. > --> You have to have an active locality first. > > > For a TPM2.0 0xFF is not a valid value (if active locality is set), since reading commandCancel and resetEstablishment bit always return 0 on reads (according to spec). > > --> 0xFF should be treated as a TPM1.2 (older tpms with TIS 1.2) > --> 0x04 should be treated as TPM 2.0 > --> 0x08 should be treated as TPM1.2 (newer tpms with TIS1.3 enhanced)
> + sts3 = ioread8(chip->vendor.iobase + TPM_STS3(1)); > + if ((sts3 & TPM_STS3_TPM2_FAM) == TPM_STS3_TPM2_FAM) > + chip->flags = TPM_CHIP_FLAG_TPM2;
#define TPM_STS3_TPM2_FAM_MASK = 0x0c
then:
if ((sts3 & TPM_STS3_TPM2_FAM_MASK) == TPM_STS3_TPM2_FAM) ...
[see my previous review on this]
Stefan
> > > > Thanks, > Peter > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > _______________________________________________ > tpmdd-devel mailing list > tpmdd-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/tpmdd-devel >
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