Help getting a very odd resolution screen working

[pomtom44]

Hi all.
Apologies if I have missed something, or am doing something not quite right.
Most of my raspberry pi projects have been on just the default OS
However I need something light weight and "Power loss" safe, so hence tinycore.
I have managed to get my way into getting TC.tcz installed and starting as boot on a standard 1920x1080 display
however I now want to move to the screen ill be using on my project which is 1920x480
I have tried a few different things, but just cant either get things to install, or get the settings to apply.

The long term goal is to have a python GUI boot as fast as possible once powered on, so if there is a better way to help, please let me know
otherwise, how do I get the display to work?

Many thanks in advance

[Paul_123]

Can you post details of the screen?  And what pi are you using?

[pomtom44]

Can you post details of the screen?  And what pi are you using?

It is a generic screen
Listing I got it from is here:
https://www.aliexpress.com/item/1005005777270234.html?spm=a2g0o.order_list.order_list_main.5.6a8e1802ECnirm

Running on a raspberry pi 3b

[Paul_123]

If its HDMI, is it reporting EDID information, otherwise you will need to manually setup custom HDMI modes.

If you are using the vc4-kms-v3d then you will need to set that up in Xorg.  If not, then you need to set it up in the config.txt for the Pi3b firmware to setup the mode.

Start here:  https://www.raspberrypi.com/documentation/computers/config_txt.html#video-options

[pomtom44]

Ok with some further searching online I did manage to find this post which did help
I was using some of these flags originally but not all, so not sure what finally helped

https://gist.github.com/innovodesign/3f5775d19cb890c0aa59fbb96757bf4b

Now to get the python GUI to auto start and see how I can speed it up