Re: [tboot-devel] [tpmdd-devel] TPM driver problem on GM45

[Seiji M. <sei...@gm...>]

On Tue, Dec 2, 2008 at 4:08 PM, Seiji Munetoh
> I think tpm_tis driver also uses MMIO.
> I have take a look the detail. and It seems there are two problems.
> - iTPM on GM45 does not supports PNP

It has the following entry in DSDT.
---
<snip>
                Device (TPM)
                {
                    Method (_HID, 0, NotSerialized)
                    {
                        TPHY (0x00)
                        If (LEqual (TPMV, 0x01))
<snip>
---

However, Linux PNP detects the device based on the EisaID.
Also. I have check the TCG ACPI Specification. it does not
required EisaID as the HID.
---
_HID
Named object that provides the interface's Plug and Play
identifier. This value may be TPM vendor specific. _HID is
a standard device configuration control method defined in
the ACPI Specification.
Required only for devices that do not have standard enumeration mechanism.
---

We can use the device by modprobe with force=1 option.
But it may have power management issue.

regards,
Seiji