Briefly describe the feature and specify the requirements.
Signed-off-by: Eddie James eajames@linux.ibm.com --- 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 bbd40a6e18..cf2cd81966 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -12,6 +12,7 @@ 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..13fd42a2fb --- /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.