Difference between revisions of "Intel GM45 TPM device iTPM INTC0102"
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| − | INTC0102 Intel TPM device found in GM45 chipset is supposed to comply | + | INTC0102 Intel TPM device found in GM45 chipset is supposed to comply with TCG TPM 1.2 specifications, and thus be taken care of by '''tpm_tis''' kernel module. Unfortunately, it does not. After loading this module |
modprobe tpm_tis interrupts=0 force=1 | modprobe tpm_tis interrupts=0 force=1 | ||
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/sys/kernel/security/tpm0/binary_bios_measurements | /sys/kernel/security/tpm0/binary_bios_measurements | ||
| − | but | + | but no further communication with the TPM device seems to be possible. |
In recent [http://sourceforge.net/mailarchive/forum.php?thread_name=200811280943427180885&forum_name=tpmdd-devel discussion] on tpmdd-devel mailing list Seiji Munetoh [http://sourceforge.net/mailarchive/message.php?msg_name=f02dbbe70812012308n32dc9fd6hd1f04d3ef6e002b7%40mail.gmail.com suggested] a quick fix, and Colin Didier [https://www.grounation.org/index.php?post/2008/07/04/8-how-to-use-a-tpm-with-linux made] a [http://cybione.org/~cdidier/log/data/200812020841/itpm.diff patch] out of it. | In recent [http://sourceforge.net/mailarchive/forum.php?thread_name=200811280943427180885&forum_name=tpmdd-devel discussion] on tpmdd-devel mailing list Seiji Munetoh [http://sourceforge.net/mailarchive/message.php?msg_name=f02dbbe70812012308n32dc9fd6hd1f04d3ef6e002b7%40mail.gmail.com suggested] a quick fix, and Colin Didier [https://www.grounation.org/index.php?post/2008/07/04/8-how-to-use-a-tpm-with-linux made] a [http://cybione.org/~cdidier/log/data/200812020841/itpm.diff patch] out of it. | ||
| − | Now it is working, although I am still struggling to come up with | + | Now it is working, although I am still struggling to come up with a meaningful use for this TPM device :). Note, however, that '''tpm_tis''' has to be compiled as a module and unloaded before any suspend-to-ram or suspend-to-disk. Otherwise the machine would freeze. Also note that after waking up from suspend-to-ram and reloading tpm_tis, the [http://sourceforge.net/projects/trousers trousers] daemon refuses to restart. However it restarts with no problem after waking up from suspend-to-disk. |
==Models== | ==Models== | ||
*{{X200}} | *{{X200}} | ||
Revision as of 02:45, 4 April 2009
INTC0102 Intel TPM device found in GM45 chipset is supposed to comply with TCG TPM 1.2 specifications, and thus be taken care of by tpm_tis kernel module. Unfortunately, it does not. After loading this module
modprobe tpm_tis interrupts=0 force=1
and mounting securityfs
mount -t securityfs none /sys/kernel/security
it is possible to read the files
/sys/kernel/security/tpm0/ascii_bios_measurements /sys/kernel/security/tpm0/binary_bios_measurements
but no further communication with the TPM device seems to be possible.
In recent discussion on tpmdd-devel mailing list Seiji Munetoh suggested a quick fix, and Colin Didier made a patch out of it.
Now it is working, although I am still struggling to come up with a meaningful use for this TPM device :). Note, however, that tpm_tis has to be compiled as a module and unloaded before any suspend-to-ram or suspend-to-disk. Otherwise the machine would freeze. Also note that after waking up from suspend-to-ram and reloading tpm_tis, the trousers daemon refuses to restart. However it restarts with no problem after waking up from suspend-to-disk.
