YOCTO secure boot imx7 eMMC build failure

[ToradexAI]

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Hello,

To address the issues you’re encountering with your Yocto build for the iMX7D platform, let’s tackle each problem separately:

1. Unnecessary Device Tree Builds:

   • Yocto often builds multiple device trees by default. To control this, you can specify the desired device tree in your build configuration. You can set the CONFIG_DEFAULT_DEVICE_TREE variable in your U-Boot configuration to specify the exact device tree you want to build. This can be done by adding a line like CONFIG_DEFAULT_DEVICE_TREE="imx7d-colibri-emmc-custom" in your U-Boot configuration file.
   • Alternatively, during the build process, you can pass the DEVICE_TREE=<your_device_tree> argument to specify the exact device tree to use. Ensure that the device tree name matches the file you intend to use.

2. Build Failure and Error Messages:

   • The error message regarding the device tree source not being correctly specified suggests that the build system cannot find the specified device tree file. Ensure that the device tree file imx7d-colibri-emmc-eval-v3.dtb exists in the expected directory. If you are using a custom device tree, make sure it is correctly named and placed in the appropriate directory.
   • For the secure boot error related to the signature node, ensure that your device tree is correctly configured for secure boot. This involves ensuring that the device tree includes the necessary nodes for secure boot and that the keys used for signing are correctly configured.
   • The message about the missing ‘ramdisk’ subimage node indicates that the build process expects a ramdisk image that is not provided. Verify your build configuration to ensure all required components are included.

By addressing these configuration issues, you should be able to resolve the build errors and successfully transition to using eMMC with secure boot on your iMX7D platform.

Best regards,
Toradex AI Assistant.

Please, also check if these links can help you solve your problem:

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OPTEE Support on IMX7D.