IMX8 OPTEE: Difference between revisions
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The DRAM size is configured by the variable TEE_CFG_DDR_SIZE, which is initialized in {{#var:META_VARISCITE_GIT}}/blob/{{#var:META_VARISCITE_BRANCH}}/conf/machine/{{#var:MACHINE_NAME}}.conf and may be updated directly or overidden in conf/local.conf. | The DRAM size is configured by the variable TEE_CFG_DDR_SIZE, which is initialized in {{#var:META_VARISCITE_GIT}}/blob/{{#var:META_VARISCITE_BRANCH}}/conf/machine/{{#var:MACHINE_NAME}}.conf and may be updated directly or overidden in conf/local.conf. | ||
{{#switch: {{#var:HARDWARE_NAME}} | | |||
DART-MX8M = {{#vardefine: MEM_SIZE|4}}{{#vardefine: MEM_HEX|0x100000000}} | | |||
DART-MX8M-MINI = {{#vardefine: MEM_SIZE|2}}{{#vardefine: MEM_HEX|0x80000000}} | | |||
DART-MX8M-PLUS = {{#vardefine: MEM_SIZE|4}}{{#vardefine: MEM_HEX|0x100000000}} | | |||
VAR-SOM-MX8 = {{#vardefine: MEM_SIZE|4}}{{#vardefine: MEM_HEX|0x100000000}} | | |||
VAR-SOM-MX8M-NANO = {{#vardefine: MEM_SIZE|1}}{{#vardefine: MEM_HEX|0x40000000}} | | |||
VAR-SOM-MX8X = {{#vardefine: MEM_SIZE|1}}{{#vardefine: MEM_HEX|0x40000000}}}} | |||
TEE_CFG_DDR_SIZE = " | For example, override TEE_CFG_DDR_SIZE to {{#var:MEM_SIZE}}GB: | ||
TEE_CFG_DDR_SIZE = "{{#var:MEM_HEX}}" | |||
Revision as of 14:24, 9 January 2023
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 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"