Re: Aw: Re: [tpmdd-devel] [PATCH] tpm: improve tpm_tis send() performance by ignoring burstcount

Ken Goldman
2017-08-11T21:31:39Z

On 8/9/2017 5:00 PM, Peter Huewe wrote:
>
> Since we are the linux kernel, we do have to care for legacy
> devices. And a system with LPC, PS2Mouse on SuperIO and a TPM are not
> that uncommon.
>
> And heck, we even have support for 1.1b TPM devices....

Understood. However, remember that SuperIO is a 1980's device that
predates the TPM. Since the TPM requires special LPC bus cycles, it's
even less likely that an old chipset has an attached TPM.

> Interesting - let me check with Georg tomorrow. Unfortunately I do
> not have access to my tcg mails from home (since I'm not working :),
> but did you _explicitly_ talk about LPC and the system? I'm sure the
> TPM does not care about the waitstates...

Yes, Infineon was one of the 3 TPM vendors who confirmed this.