We previously installed dtbs outside of the boot partition, so it
was necessary to copy them from the root partition to boot if you
wanted to utilise them in U-Boot scripts. This is no longer
necessary as we now install dtbs to the boot partition directly, so
remove this workaround and edit the U-Boot script to reflect the
change.
still missing:
* audio
* lcd backlight control
* touchscreen driver
* front camera
* accelerometer mount fix (driver seem not to support mount-matrix)
* 3D acceleration
* HDMI support