Re: [tpmdd-devel] when tpm_infineon? when tpm_tis?

[Kent Y. <ke...@li...>]

Hi Jon,

On Fri, Jul 13, 2012 at 01:14:09PM -0400, Jonathan McCune wrote:
> Hello,
> 
> I frequently do TPM-related work on HP systems with v1.2 Infineon TPMs.
> 
> I don't understand the intention of the Infineon-specific driver for
> v1.2 TPMs.  Isn't tpm_tis.ko good enough?  I've never had a problem
> using just tpm_tis.
> 
> When both are loaded (as is often the case in default Ubuntu desktop
> configurations), the TPM doesn't work correctly (e.g., tcsd from
> trousers throws an "Internal software error").  I thought about
> tracking down the specific problem, but I wanted to first ask about
> whether it is even intended that tpm_infineon take precedence over
> tpm_tis on systems with v1.2 TPMs from Infineon?

 My understanding is this (I don't have an infineon test machine):
tpm_infineon, tpm_atmel and tpm_nsc are for v1.1 TPMs from those
vendors. These chips pre-dated the TPM TIS specification. All TPM 1.2
chips follow the TPM TIS spec and are therefore usable with the tpm_tis
driver.

Kent