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| author | Eddie James <eajames@linux.ibm.com> | 2023-10-24 10:43:52 -0500 |
|---|---|---|
| committer | Ilias Apalodimas <ilias.apalodimas@linaro.org> | 2023-10-27 13:17:21 +0300 |
| commit | 450afc350cd306e800f97baee0fbcaa0d1e8df80 (patch) | |
| tree | 27fb8718c8cb010a810db4178456364ec8303d88 /doc | |
| parent | 5999ea20fa42e78f872720ec3d0ee1d8df1a1f40 (diff) | |
| download | u-boot-450afc350cd306e800f97baee0fbcaa0d1e8df80.zip u-boot-450afc350cd306e800f97baee0fbcaa0d1e8df80.tar.gz u-boot-450afc350cd306e800f97baee0fbcaa0d1e8df80.tar.bz2 | |
doc: Add measured boot documentation
Briefly describe the feature and specify the requirements.
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/usage/index.rst | 1 | ||||
| -rw-r--r-- | doc/usage/measured_boot.rst | 31 |
2 files changed, 32 insertions, 0 deletions
diff --git a/doc/usage/index.rst b/doc/usage/index.rst index fa70292..fb043a8 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -14,6 +14,7 @@ Use U-Boot partitions cmdline semihosting + measured_boot Shell commands -------------- diff --git a/doc/usage/measured_boot.rst b/doc/usage/measured_boot.rst new file mode 100644 index 0000000..0aad590 --- /dev/null +++ b/doc/usage/measured_boot.rst @@ -0,0 +1,31 @@ +.. SPDX-License-Identifier: GPL-2.0+ + +Measured Boot +===================== + +U-Boot can perform a measured boot, the process of hashing various components +of the boot process, extending the results in the TPM and logging the +component's measurement in memory for the operating system to consume. + +By default, U-Boot will measure the operating system (linux) image, the +initrd image, and the "bootargs" environment variable. By enabling +CONFIG_MEASURE_DEVICETREE, U-Boot will also measure the devicetree image. + +The operating system typically would verify that the hashes found in the +TPM PCRs match the contents of the event log. This can further be checked +against the hash results of previous boots. + +Requirements +--------------------- + +* A hardware TPM 2.0 supported by the U-Boot drivers +* CONFIG_TPM=y +* CONFIG_MEASURED_BOOT=y +* Device-tree configuration of the TPM device to specify the memory area + for event logging. The TPM device node must either contain a phandle to + a reserved memory region or "linux,sml-base" and "linux,sml-size" + indicating the address and size of the memory region. An example can be + found in arch/sandbox/dts/test.dts +* The operating system must also be configured to use the memory regions + specified in the U-Boot device-tree in order to make use of the event + log. |