Hello @mthevenot,
I am not sure I understood your request correctly.
If you want a reference image, you can download it from here: Download Links | Toradex Developer Center
Otherwise, the steps to use the BSP to build an image can be followed from the following page: Build a Reference Image with Yocto Project/OpenEmbedded | Toradex Developer Center
By default, our BSP and reference images do not have support for your DSI display included, only the Capacitive Touch Display 10.1" DSI we offer for development.
To enable your display additional integration work is needed on your custom image, which is what I have been trying to support you with.
I will have a look at the latest image that you have, checking why it is not giving the expected logs for the display driver, and give updates on the other community thread.
Best Regards,
Bruno