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
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@ -21,12 +21,16 @@ QEMU files related to TPM TIS interface:
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- ``hw/tpm/tpm_tis_common.c``
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- ``hw/tpm/tpm_tis_isa.c``
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- ``hw/tpm/tpm_tis_sysbus.c``
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- ``hw/tpm/tpm_tis_i2c.c``
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- ``hw/tpm/tpm_tis.h``
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Both an ISA device and a sysbus device are available. The former is
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used with pc/q35 machine while the latter can be instantiated in the
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Arm virt machine.
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An I2C device support is also provided which can be instantiated in the Arm
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based emulation machines. This device only supports the TPM 2 protocol.
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CRB interface
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-------------
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@ -348,6 +352,23 @@ In case an Arm virt machine is emulated, use the following command line:
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-drive if=pflash,format=raw,file=flash0.img,readonly=on \
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-drive if=pflash,format=raw,file=flash1.img
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In case a ast2600-evb bmc machine is emulated and you want to use a TPM device
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attached to I2C bus, use the following command line:
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.. code-block:: console
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qemu-system-arm -M ast2600-evb -nographic \
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-kernel arch/arm/boot/zImage \
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-dtb arch/arm/boot/dts/aspeed-ast2600-evb.dtb \
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-initrd rootfs.cpio \
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-chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \
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-tpmdev emulator,id=tpm0,chardev=chrtpm \
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-device tpm-tis-i2c,tpmdev=tpm0,bus=aspeed.i2c.bus.12,address=0x2e
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For testing, use this command to load the driver to the correct address
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echo tpm_tis_i2c 0x2e > /sys/bus/i2c/devices/i2c-12/new_device
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In case SeaBIOS is used as firmware, it should show the TPM menu item
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after entering the menu with 'ESC'.
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