linux-kernel - Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

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Date:   Sun, 11 Nov 2018 19:51:01 +0100
From:   Michael Niewöhner <linux@...ewoehner.de>
To:     Mimi Zohar <zohar@...ux.ibm.com>, peterhuewe@....de,
        jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca, arnd@...db.de,
        linux-integrity@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

Hi Mimi,

On Sun, 2018-11-11 at 13:33 -0500, Mimi Zohar wrote:
> On Sun, 2018-11-11 at 18:55 +0100, Michael Niewöhner wrote:
> > Hi all,
> > 
> > Nuvoton NCPT650 does not work in TPM 2.0 mode with tpm_tis / tpm_i2c_nuvoton
> > while it works in TPM 1.2 mode (I can reflash it via UEFI setup).
> > Kernel version is 4.19.1
> > 
> > Kernel config:
> > 
> > $ cat .config | egrep 'TCG|TPM|CRB|_TIS'
> > CONFIG_TCG_TPM=y
> > CONFIG_HW_RANDOM_TPM=y
> > CONFIG_TCG_TIS_CORE=y
> > CONFIG_TCG_TIS=y
> > CONFIG_TCG_TIS_SPI=y
> > # CONFIG_TCG_TIS_I2C_ATMEL is not set
> > # CONFIG_TCG_TIS_I2C_INFINEON is not set
> > CONFIG_TCG_TIS_I2C_NUVOTON=y
> > # CONFIG_TCG_NSC is not set
> > # CONFIG_TCG_ATMEL is not set
> > # CONFIG_TCG_INFINEON is not set
> > CONFIG_TCG_CRB=y
> > # CONFIG_TCG_VTPM_PROXY is not set
> > # CONFIG_TCG_TIS_ST33ZP24_I2C is not set
> > # CONFIG_TCG_TIS_ST33ZP24_SPI is not set
> > 
> > 
> > TPM 1.2 mode dmesg:
> > 
> > $ dmesg | egrep -i tis\|tpm\|crb
> > [    3.210040] tpm_tis 00:0a: 1.2 TPM (device-id 0xFE, rev-id 2)
> > 
> > 
> > TPM 2.0 mode dmesg:
> > 
> > $ dmesg | egrep -i tis\|tpm\|crb
> > [    0.000000] efi:  ACPI
> > 2.0=0x9e457000  ACPI=0x9e457000  SMBIOS=0x9ec44000  SMBIOS
> > 3.0=0x9ec43000  TPMEventLog=0x9711f018 
> > [    0.003517] ACPI: TPM2 0x000000009E490ED8 000034 (v03 LENOVO TC-
> > S06   00001300 AMI  00000000)
> > [    4.071550] ima: No TPM chip found, activating TPM-bypass!
> 
> It's possible that eventually the TPM is initialized, but not in time
> for IMA.  Could you you check to see if the TPM is responding to
> userspace commands after boot?

No it isn't even detected. There is no /dev/tpm0 and /sys/class/tpm is empty.

> 
> Mimi
>