Antom

No need to recompile, rk322x already have had all the right bits in the right place for years. Everything is written down in the first page of the thread for rk332x tv boxes (What works: ---> Hardware video acceleration) in the hope people read it.

I tell you to read the first post of the thread.

The first post reads "your mileage may vary" and "the latest kernel will work best"
 
Start by recompiling armbian for your Rockchip SBC, with the edge kernel option, then follow the ffmpeg install instructions 
 
If it doesn't work, try the older Ubuntu, and both Debian options

If the u-boot on the unit supports USB Boot, yes. 
 
GXL:BL1:9ac50e:bb16dc;FEAT:ADFD318C:0;POC:3;RCY:0;EMMC:800;NAND:81;SD:800;USB:8;LOOP:1;EMMC:800;NAND:81;SD:800;USB:8;LOOP:2;EMMC:800;NAND:81;SD:800;USB:8;LOOP:3;EMMC:0;READ:0;0.0;CHK:0; The above looks like USB Mode. This Mode is for flashing vendor or custom imgs to the unit via USB. This is for recovery.
 
 

Build legacy it with v22.08 armbian https://github.com/armbian/build/blob/v22.08/patch/kernel/rockchip64-legacy

 
git clone --depth 1 --branch v22.08 https://github.com/armbian/build cd build ./compile.sh

 

no, because the kernel can't see nand devices, 
this is why it cant find the UUID
the device dont exist for kernel mainline

My opinion = SDCARD K6.6 > NAND k4.4

Nope, and the answer from @Hqnicolas is right: mainline kernel has no driver for NAND controller on rk322x.
To be precise, in the mainline kernel there is a driver that is capable of access the NAND raw cells, but the mainline kernel lacks a Flash Translation Layer (FTL) that is embedded as assembly code into the vendor kernel which, in turn, has a driver which does a sort of  "emulation" of a block device.

moved