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To create a device tree from a custom carrier board for Jetson Orin NX, you can follow these steps:
-
Create a new device tree file: Create a new file with a .dts extension, for example, mydt.dts. This file will contain the device tree configuration for your custom carrier board.
-
Include the NVIDIA device tree file: At the top of your mydt.dts file, include the NVIDIA device tree file using the include directive. For example:
include “tegra234-p3768-0000-p3767-0000.dts”
This will include the device tree configuration for the Jetson Orin NX module.
3. **Define your custom device tree configuration**: Below the `include` directive, define your custom device tree configuration. For example:
```dts
mydt {
status = "okay";
// Add your custom device tree configuration here
};
Replace the comment with your actual device tree configuration.
-
Create a Kconfig file: Create a new file with a .kconfig extension, for example, mydt.kconfig. This file will contain the configuration options for your custom device tree.
-
Define the configuration option: In the mydt.kconfig file, define a configuration option for your custom device tree. For example:
config CUSTOM_DT
bool “Custom Device Tree”
default n
help
Enable custom device tree configuration
This will create a configuration option called `CUSTOM_DT` that can be enabled or disabled.
6. **Modify the kernel defconfig file**: Modify the kernel defconfig file to include your custom configuration option. For example, add the following line to the `defconfig` file:
```makefile
CONFIG_CUSTOM_DT=y
This will enable your custom device tree configuration by default.
-
Modify the device tree Makefile: Modify the device tree Makefile to include your custom device tree file. For example, add the following lines to the Makefile:
ifeq ($(CONFIG_CUSTOM_DT),y)
dtb-$(CONFIG_ARCH_TEGRA_234) += mydt.dtb
endif
This will build your custom device tree file only if the `CUSTOM_DT` configuration option is enabled.
8. **Build the device tree**: Build the device tree using the `make` command. For example:
```bash
make dtbs
This will build your custom device tree file and create a `mydt.dtb` file in the `arch/arm64/boot/dts/` directory.
By following these steps, you can create a custom device tree for your Jetson Orin NX module and enable it using a configuration option.
Comparison with your approach:
You have tried to create a device tree file with a conditional statement to build the device tree only if the CONFIG_CUSTOM_DT configuration option is enabled. However, you have not defined the CUSTOM_DT configuration option in a Kconfig file, which is required to enable the configuration option.
Additionally, you have not modified the kernel defconfig file to include your custom configuration option, which is required to enable the configuration option by default.
By following the steps outlined above, you can create a custom device tree for your Jetson Orin NX module and enable it using a configuration option.
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