IMX8 OPTEE

DART-MX8M-PLUS OPTEE

OP-TEE Introduction

NXP i.MX Platforms support the use of Open Portable Trusted Execution Environment (OP-TEE).

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 optee-os and needs to be updated according to the memory configuration of your SoM.

The DRAM size is configured by the variable TEE_CFG_DDR_SIZE, which is initialized in https://github.com/varigit/meta-variscite-bsp/blob/kirkstone/conf/machine/imx8mp-var-dart.conf and may be updated directly or overidden in conf/local.conf.

For example, override TEE_CFG_DDR_SIZE to 4GB:

TEE_CFG_DDR_SIZE = "0x100000000"