I think the overlays work. I tested with the overclocking overlay you mentioned in another post and reverted back to the original .dtb with the overlay.
Also, the I2C interfaces do get found by i2cdetect but they have no data coming through despite pins being utilized. I’m trying to get the PiSugar UPS to work with the Radxa Zero. So far the power is being sent, but the internal service to report on battery levels and other utilities require i2c access. I know that the Radxa might/would have different addresses for the pins but I think if I can detect that something is coming through, that I can identify which hex addresses and modify their app to use those instead.
Maybe you can help me know how to test if the i2c interface is active somehow?
Also, do you know why HDMI comes out as i2c-0? I do a sudo i2cdetect -l and on default .dtb, i2c-0 gets reported and it’s HDMI…