https://wiki.coreelec.org/coreelec:devgeneric#amglogic_ne
To be honest we have some news in background:
Amlogic Kernel 5.15
This will bring back G12B (S922X/A311D) and SM1 (S905X3) back to Amlogic-ne.
Because of the currently destabilized Kodi Omega status we try to re-configure CoreELEC-20 and CoreELEC-21. This mean Dolby Vision is on plan to be backport to CoreELEC-20 and the new Kernel 5.15 is planed for CoreELEC-21.
The Kernel 5.15 CoreELEC-21 will have no GXL support anymore as there will be no more Amlogic-ng device with Kernel 4.9. We are not sure about G12A (S905X2), maybe it’s supported or maybe not.