Hi, I’m trying to build an embedded OS image for ROCK Pi 4 with Yocto/OpenEmbedded. I understand there is no official support for this, so I’m on my own.
Right now I have the image building with my custom layer on top of
meta-rockchip, that is using
radxa/u-boot instead of the official ROCKCHIP-Linux BSP forks. So everything seems fine, except there is no HDMI output when I boot from the SD card, and there is no network connectivity. I’m able to boot the official Ubuntu Server image just fine, so I know there is nothing wrong with my ROCK Pi. I think there is something wrong with the way I’m building the SD card image.
I am waiting to get my USB-Serial device in the mail so I can debug via the UART serial console, but in the meantime… is there any documentation I can read about the way the SD card should be formatted, and what the ROCK Pi expects to see on the SD card so it can boot?