From: Seiji M. <sei...@gm...> - 2008-12-02 09:49:40
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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 |