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| author | Ninad Palsule <ninad@linux.ibm.com> | 2023-04-14 17:07:52 -0500 |
|---|---|---|
| committer | Stefan Berger <stefanb@linux.ibm.com> | 2023-04-20 08:17:15 -0400 |
| commit | fbd945e7831b45b266dae292e79b6cce2b94924f (patch) | |
| tree | a58d86d707bd552a2ba652713ff7c0444db61baa /docs | |
| parent | 2d82c32b2ceaca3dc3da5e36e10976f34bfcb598 (diff) | |
docs: Add support for TPM devices over I2C bus
This is a documentation change for I2C TPM device support.
Qemu already supports devices attached to ISA and sysbus.
This drop adds support for the I2C bus attached TPM devices.
Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Message-id: 20230414220754.1191476-2-ninadpalsule@us.ibm.com
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/specs/tpm.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/docs/specs/tpm.rst b/docs/specs/tpm.rst index 535912a92b..efe124a148 100644 --- a/docs/specs/tpm.rst +++ b/docs/specs/tpm.rst @@ -21,12 +21,16 @@ QEMU files related to TPM TIS interface: - ``hw/tpm/tpm_tis_common.c`` - ``hw/tpm/tpm_tis_isa.c`` - ``hw/tpm/tpm_tis_sysbus.c`` + - ``hw/tpm/tpm_tis_i2c.c`` - ``hw/tpm/tpm_tis.h`` Both an ISA device and a sysbus device are available. The former is used with pc/q35 machine while the latter can be instantiated in the Arm virt machine. +An I2C device support is also provided which can be instantiated in the Arm +based emulation machines. This device only supports the TPM 2 protocol. + CRB interface ------------- @@ -348,6 +352,23 @@ In case an Arm virt machine is emulated, use the following command line: -drive if=pflash,format=raw,file=flash0.img,readonly=on \ -drive if=pflash,format=raw,file=flash1.img +In case a ast2600-evb bmc machine is emulated and you want to use a TPM device +attached to I2C bus, use the following command line: + +.. code-block:: console + + qemu-system-arm -M ast2600-evb -nographic \ + -kernel arch/arm/boot/zImage \ + -dtb arch/arm/boot/dts/aspeed-ast2600-evb.dtb \ + -initrd rootfs.cpio \ + -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \ + -tpmdev emulator,id=tpm0,chardev=chrtpm \ + -device tpm-tis-i2c,tpmdev=tpm0,bus=aspeed.i2c.bus.12,address=0x2e + + For testing, use this command to load the driver to the correct address + + echo tpm_tis_i2c 0x2e > /sys/bus/i2c/devices/i2c-12/new_device + In case SeaBIOS is used as firmware, it should show the TPM menu item after entering the menu with 'ESC'. |