Problem with custom machine device tree updates

[m_g]

Hi there,

I am in the process of creating a custom machine for the STM32MP257F-DK board following this Wiki guide. After following the necessary steps, I can successfully bitbake st-image-weston with my CubeMX-generated device tree files.

I am hitting an issue where updates to my device tree source (within the mx/ directory in the meta-st-stm32mp-addons layer) are typically not reflected in the output image. As a simple test, I am changing the model name then running bitbake st-image-weston. It looks as if bitbake does carry out some recompile/configure of linux-stm32mp but after updating the board (using the flash-layout-x-.tsv). The model name change is not reflected.

This sounds similar to an issue mentioned in this post. As suggested, I have confirmed the #@NAME: variable reflects my custom machine name and have tried forcing a rebuild with:

bitbake linux-stm32mp -c cleanall

bitbake linux-stm32mp

bitbake st-image-weston

 

Very occasionally, changes to the kernel dts have been correctly reflected when re-running bitbake. But I cannot seem to find what actually causes the changes to be correctly updated.

For reference, I have attached my machine.conf and my directory structure within the addons layer is as follows:

mx
└── custom
 ├── CA35
 │ ├── DeviceTree
 │ │ └── custom
 │ │ ├── kernel
 │ │ │ ├── Makefile
 │ │ │ ├── stm32mp257f-custom-mx.dts
 │ │ │ └── stm32mp257f-custom-mx-resmem.dtsi
 │ │ ├── optee-os
 │ │ │ ├── conf.mk
 │ │ │ ├── stm32mp257f-custom-mx.dts
 │ │ │ ├── stm32mp257f-custom-mx-rcc.dtsi
 │ │ │ ├── stm32mp257f-custom-mx-resmem.dtsi
 │ │ │ └── stm32mp257f-custom-mx-rif.dtsi
 │ │ ├── tf-a
 │ │ │ ├── stm32mp257f-custom-mx.dts
 │ │ │ ├── stm32mp257f-custom-mx-fw-config.dts
 │ │ │ ├── stm32mp257f-custom-mx-rcc.dtsi
 │ │ │ └── stm32mp25-mx.dtsi
 │ │ └── u-boot
 │ │ ├── Makefile
 │ │ ├── stm32mp257f-custom-mx.dtb
 │ │ ├── stm32mp257f-custom-mx.dts
 │ │ ├── stm32mp257f-custom-mx-resmem.dtsi
 │ │ └── stm32mp257f-custom-mx-u-boot.dtsi
 │ └── manifest.prop

 

Any guidance/help would be greatly appreciated!

Thanks.