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Write a minimal virtual DRM driver that exposes a simple framebuffer and supports page flipping.

Open the DRM device, get basic GPU info, and allocate a dumb buffer (simple framebuffer).

  • Checkpoints:
  • Learning outcomes:

    • Debugging and testing the Linux graphics subsystem can be a challenging and rewarding task.

    Creating a Linux graphics toolkit can be a great way to provide a simple and easy-to-use API for graphics programming.

    Goal: Use checkpatch.pl and sparse to analyze a real DRM driver (e.g., panel-simple.c), then add a new display mode to the driver’s EDID fallback table.

    Why it matters: Many embedded Linux projects (Raspberry Pi, i.MX, Allwinner) require custom display panel support. Modifying a DRM panel driver is a common real-world task.

    Steps:

    Before starting, ensure you have:

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