Found info from this post:
Some general info her on u-boot for RK. https://u-boot.readthedocs.io/en/latest/board/rockchip/rockchip.html
1. Can you boot from Multitool.img ? , IF no then its will not be possible to boot Armbian from sdcard.
2. If you can , burn Armbian 22.08 - Debian image found inn first post to sdcard.
3. Burn Multitool.img to another sdcard or mount image on Linuxpc
Manuel mount multitool.img
From terminal.
cd $HOME/Downloads/
# find first unused device , /dev/loop(24)
losetup -f
# Mount img on /dev/loop24
sudo losetup -P /dev/loop24 multitool.img
# Open file-browser MULTITOOL/bsp/
# copy uboot.img and trustos.img to $HOME/Download Linuxpc
# Insert sdcard to linuxpc and find dev of sdcard / often last sdX
lsblk -f
# My sdcard is assigned /dev/sdf
# DD uboot and trust IMG to sdcard armbian
# Replace /dev/SDCARD to your dev for sdcard like sdf
sudo dd if=uboot.img of=/dev/SDCARD seek=16384 conv=fsync
sudo dd if=trustos.img of=/dev/SDCARD seek=24576 conv=fsync
If this not work you can copy the generic DTB rk3318-box.dtb form multitool.img to sdcard.
You find generic DTB on root / multitool.
Copy this to /boot/dtb/rockchip SDCARD to overwrite DTB on Armbian image.
Or burn older Armbian img to test if they boots form sdcard when Android on internal storage.
Happy booting!!
