Currently, RGA is not enabled in the device tree for the Ubuntu image. It needs to be enabled here:
https://gitlab.com/TeeFirefly/linux-kernel/blob/firefly/arch/arm64/boot/dts/rockchip/rk3399-firefly-linux.dts
Adding the following to the bottom of the file:
&rga {
status = "okay";
};
Oh, Thank’ for pointing out our oversight
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