On Sun, Dec 14, 2014 at 09:48:26AM -0500, Stefan Berger wrote: > On 12/12/2014 02:46 PM, Jarkko Sakkinen wrote: > >Detect TPM 2.0 by sending idempotent TPM 2.x command. Ordinals for > >TPM 2.0 are higher than TPM 1.x commands so this should be fail-safe. > >Using STS3 is unreliable because some chips just report 0xff and not > >what the spec says. > > TPM TIS 1.2 can report either 0xff or 0x00 for sts3 since that part of > register was not defined for this version but only for a later version. So, > unless the TIS 1.3 for TPM 2.0 is broken, it should report a bit _pattern_ > (not plain 0x00 or 0xff) that you could apply the suggested mask to and > check then. I propose this: lets keep the bit ugly but approach for now and when there are TPM2 FIFOs available in the market move to your workaround. I think that would be the most reasonable middle road here. > Stefan /Jarkko -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
