..., so i edit the 13-Tanix-TX6.patch and rebuild the kernel to generate the dtb file, and it worked very well, i flashed the "Libreelec" on sunvell Q+ (same as Tanix TX6) emmc, i can confirm it working, also i can now boot with "label" or "uuid" entries instead of device logical name in "extlinux.conf"....
what Image are You use?
I try last LibreELEC-H6.arm-9.80-nightly-20200626-cc6e86c-tanix-tx6.img.gz on my Sunvell Q Plus (on SD card), but just only black window is. Before this I try use this
APPEND boot=/dev/mmcblk0p1 disk=/dev/mmcblk0p2 console=tty1 console=ttyS0,115200
and Q+ start and show only LibreElec logo and stay there.