4.8.1.1. DTB binding for Event Log properties
This document describes the device tree format of Event Log properties. These properties are not related to a specific platform and can be queried from common code.
4.8.1.1.1. Dynamic configuration for Event Log
Measured Boot driver expects a tpm_event_log node with the following field in ‘tb_fw_config’, ‘nt_fw_config’ and ‘tsp_fw_config’ DTS files:
- compatible [mandatory]
value type: <string>
Must be the string “arm,tpm_event_log”.
Then a list of properties representing Event Log configuration, which can be used by Measured Boot driver. Each property is named according to the information it contains:
- tpm_event_log_sm_addr [fvp_nt_fw_config.dts with OP-TEE]
value type: <u64>
Event Log base address in secure memory.
Note. Currently OP-TEE does not support reading DTBs from Secure memory and this property should be removed when this feature is supported.
- tpm_event_log_addr [mandatory]
value type: <u64>
Event Log base address in non-secure memory.
- tpm_event_log_size [mandatory]
value type: <u32>
Event Log size.