Hi. Thank you musicPi for your guide. I have A40 based board with 5" RGB display and I'm trying to make it Workstation under mainline kernel. But I figure out that A40 incompatible with option VIDEO_SUNXI in u-boot (according to https://github.com/u-boot/u-boot/blob/master/arch/arm/mach-sunxi/Kconfig#L817 ), so I can not reproduce 2nd step. Is it possible to bring up RGB display without u-boot?