Quick booting a software defined rear view camera
summary
Software-defined fast rear-view uses libcamera + DRM KMS to bypass compositors, pack camera binary and libs into the initramfs, and start a systemd unit with default-dependencies=no and ignore-on-isolate=true. The reference app twincam writes frames straight to the framebuffer (avoids Wayland) and shows frames at ~1.4 s after kernel boot and full display by ~1.8 s versus ~14 s with a normal kiosk start. Raspberry Pi and M1 timings validate feasibility across hardware.
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chapters (10)
- 0:00Introduction
- 1:50Optimization scope
- 3:59Linux boot process
- 6:49Quick booting tips
- 8:12Rear view camera approaches
- 9:41Optimized libDRM/libcamera
- 12:31Camera in initramfs
- 15:00Results and demo
- 17:41Related talk and conclusion
- 18:29Question and answer session
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