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The Pi OS and Ubuntu have different kernels, and most likely this display uses a device driver which is not "mainlined", that is, it was developed for a specific kernel and may not work with a different one. Mainlined drives become part of Linux and are tested for compatibility with every kernel release. That repo you have found likely contains a ...


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Here's an example of a project which starts custom executables directly from a RAM disk image (/boot/initrd). It's certanly not the earliest place possible, but at least it happens before the root partition is mounted, so this code runs before anything located on the root partition. It's as early as you can get without writing kernel code. The I2C driver can ...


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This looks promising: https://www.raspberrypi.org/forums/viewtopic.php?t=143581 The screen in your link uses a XPT2046 chip. Seems that this line is required in the /boot/config.txt file: dtoverlay=ads7846,penirq=25,speed=10000,penirq_pull=2,xohms=150 The parameters for the framebuffer (width and height) could be a problem, try commenting them out by adding ...


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