Briefly describe the feature and specify the requirements.
Signed-off-by: Eddie James eajames@linux.ibm.com Reviewed-by: Simon Glass sjg@chromium.org --- doc/usage/index.rst | 1 + doc/usage/measured_boot.rst | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+) create mode 100644 doc/usage/measured_boot.rst
diff --git a/doc/usage/index.rst b/doc/usage/index.rst index 388e59f173..64eb362aef 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -13,6 +13,7 @@ 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 0000000000..8357b1f480 --- /dev/null +++ b/doc/usage/measured_boot.rst @@ -0,0 +1,23 @@ +.. 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. + +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.