1.. SPDX-License-Identifier: GPL-2.0+ 2 3Measured Boot 4===================== 5 6U-Boot can perform a measured boot, the process of hashing various components 7of the boot process, extending the results in the TPM and logging the 8component's measurement in memory for the operating system to consume. 9 10Requirements 11--------------------- 12 13* A hardware TPM 2.0 supported by the U-Boot drivers 14* CONFIG_TPM=y 15* CONFIG_MEASURED_BOOT=y 16* Device-tree configuration of the TPM device to specify the memory area 17 for event logging. The TPM device node must either contain a phandle to 18 a reserved memory region or "linux,sml-base" and "linux,sml-size" 19 indicating the address and size of the memory region. An example can be 20 found in arch/sandbox/dts/test.dts 21* The operating system must also be configured to use the memory regions 22 specified in the U-Boot device-tree in order to make use of the event 23 log. 24