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[PULL 1/7] docs: Add support for TPM devices over I2C bus
From: |
Stefan Berger |
Subject: |
[PULL 1/7] docs: Add support for TPM devices over I2C bus |
Date: |
Thu, 20 Apr 2023 08:32:41 -0400 |
From: Ninad Palsule <ninad@linux.ibm.com>
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
---
docs/specs/tpm.rst | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
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'.
--
2.39.1
- [PULL 0/7] Merge tpm 2023/04/20 v1, Stefan Berger, 2023/04/20
- [PULL 4/7] tests/avocado/aspeed: Add TPM TIS I2C test, Stefan Berger, 2023/04/20
- [PULL 5/7] qtest: Add functions for accessing devices on Aspeed I2C controller, Stefan Berger, 2023/04/20
- [PULL 1/7] docs: Add support for TPM devices over I2C bus,
Stefan Berger <=
- [PULL 2/7] tpm: Extend common APIs to support TPM TIS I2C, Stefan Berger, 2023/04/20
- [PULL 6/7] qtest: Move tpm_util_tis_transmit() into tpm-tis-utils.c and rename it, Stefan Berger, 2023/04/20
- [PULL 3/7] tpm: Add support for TPM device over I2C bus, Stefan Berger, 2023/04/20
- [PULL 7/7] qtest: Add a test case for TPM TIS I2C connected to Aspeed I2C controller, Stefan Berger, 2023/04/20
- Re: [PULL 0/7] Merge tpm 2023/04/20 v1, Richard Henderson, 2023/04/22