IMX8 OPTEE
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DART-MX8M-PLUS OPTEE
OP-TEE Introduction
NXP Platforms are enabled with Open Portable TEE (OP-TEE), which is an open source project which contains a full implementation to make up a complete Trusted Execution Environment.
For more information, please see the following resources from NXP:
- https://www.nxp.com/docs/en/user-guide/IMX_PORTING_GUIDE.pdf
- https://www.nxp.com/design/training/trusted-execution-environment-getting-started-with-op-tee-on-i-mx-processors:TIP-TRUSTED-EXECUTION-ENVIRONMENT-GETTING-STARTED
Enable OP-TEE with Yocto
To enable OP-TEE, add the following to conf/local.conf:
MACHINE_FEATURES:append += " optee" DISTRO_FEATURES:append += " optee" IMAGE_INSTALL:append += " optee-os optee-test"
Then, rebuild the Yocto image and test OP-TEE using the xtest utility.
For more information about how to rebuild the Yocto, follow the steps here: Build Yocto from source code.
OP-TEE Memory Configuration
The DRAM memory size is hardcoded in the optee-firmware. This value needs to be updated according to the memory configuration of your SoM.
To do this, override TEE_CFG_DDR_SIZE in conf/local.conf. For example, override TEE_CFG_DDR_SIZE to 2GB:
TEE_CFG_DDR_SIZE = "0x80000000"