Build instructions Raspbian 32-bit

dtbo

dtc -@ -O dtb -o vc4-vga666-overlay.dtbo vc4-vga666-overlay.dts

rpi-dipac

1. Install Kernel Headers
   sudo apt install raspberrypi-kernel-headers
2. Compile drm bridge (do not use sudo)
   make -f Makefile.cross ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- KERNELDIR=/lib/modules/$(uname -r)/build
3. Copy .ko file into system dir
   sudo cp rpi-dpidac.ko /usr/lib/modules/$(uname -r)/kernel/drivers/gpu/drm/bridge
   NOTE: default /boot/timings.txt path is not mounted when module tries to read the same so changed path to /home/pi/RGB-Pi/data/system.dat
4. Rebuild module dependency list
   sudo depmod
5. Add rpi-dpidac module to /etc/modules-load.d/modules.conf or /etc/modules.conf
   rpi-dpidac

Misc

• Check if kernel module is loaded
  lsmod | grep rpi_dpidac
• Display module info
  modinfo rpi-dpidac
• Load module manually
  modprobe rpi-dpidac or insmod /usr/lib/modules/$(uname -r)/kernel/drivers/gpu/drm/bridge/rpi-dpidac.ko
• Unload module manually
  modprobe -r rpi-dpidac
• Get kernel boot messages to check info
  sudo less /var/log/messages | grep RPI-DPIDAC or dmesg | grep RPI-DPIDAC