ARMBIAN 5.41,Orange Pi Plus , Custom Display resolution 2160x3840

I'm trying to get a 4K 5.5" LCD to work (only console mode needed ) . 

U-boot can get it on at the desired resolution : 2160x3840 ( yes it's a portrait mode ) and display correctly . 

Seems that U-boot is reporting the correct information to set up simpleFB , but I don't get any display after kernel loading . 

The display adapter (HDMI>MIPI) have 3 options ( switching between 3 different EDID ) , the 2 others are working correctly ( 1080x1920 , 1440x2560 ) . 

I 'm wondering if this is related to simpleFB limitation , or memory allocation ... problem is that I'm a complete noob ...

I can provide any information needed as long as you tell me what is needed . 

Update : 

Problem solved by editing z-0003-add-additional-video-modes, and compiling a full distribution . 

as I'm complete noob, I didn't do it the clean way . if some of you are interested I can give all information to add this custom mode .

Not sure on how to do it on newer kernel (I'm on 3.4.113-sun8i )as some modification like video_pll and hdmi_cts_compatibility  need to be edited. 

Edited February 23, 20188 yr by oliveenchine
Update