Dear Linux folks,
Currently, TPM support is added to the coreboot project for the Lenovo X60 [1]. Unfortunately, there seems to have been a regression between Linux 3.16 and 4.8 and 4.9, so that the Linux kernel doesn’t create the TPM device. ``` $ more /proc/version Linux version 3.16.0-4-686-pae ([email protected]) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) $ journalctl -k -o cat | grep -i tpm tpm_tis 00:08: 1.2 TPM (device-id 0x3202, rev-id 5) tpm_tis 00:08: Issuing TPM_STARTUP ``` The device `/dev/tpm0` is present. Here are the results with Linux 4.8.15. ``` kernel: [ 0.000000] Linux version 4.8.0-0.bpo.2-686-pae ([email protected]) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP Debian 4.8.15-2~bpo8+2 (2017-01-17) […] kernel: [ 11.302522] tpm tpm0: tpm_transmit: tpm_send: error -5 kernel: [ 11.302598] tpm_tis 00:08: Could not get TPM timeouts and durations ``` Remove module and run `sudo modprobe tpm_tis itpm=1 force=1`. ``` kernel: [ 35.024386] tpm_tis tpm_tis: 1.2 TPM (device-id 0x3202, rev-id 5) kernel: [ 49.160752] tpm_tis 00:08: can't request region for resource [mem 0xfed40000-0xfed44fff] kernel: [ 49.160865] tpm_tis: probe of 00:08 failed with error -16 ``` And here with Linux 4.9.13. ``` kernel: [ 7.813547] tpm_tis 00:08: 1.2 TPM (device-id 0x3202, rev-id 5) kernel: [ 7.891026] tpm tpm0: Issuing TPM_STARTUP kernel: [ 8.042783] tpm tpm0: Unable to read burstcount kernel: [ 8.042893] tpm tpm0: tpm_transmit: tpm_send: error -16 kernel: [ 8.042900] tpm_tis 00:08: Could not get TPM timeouts and duration ``` If I am not mistaken, the error code 16 is for the macro `EBUSY`. It’d be great, if the TPM would also be created in the newer Linux Kernel versions, so that Debian users can upgrade to the upcoming stable release, which ships Linux 4.9. Unfortunately, I won’t be able to bisect the commit introducing the regression. Could you please tell me how to debug, why the burstcount cannot be read. Kind regards, Paul [1] https://review.coreboot.org/13410/ ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ tpmdd-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
