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Frame buffer over X

For a special case, I have a classic Tinkeros installation, running dual screen on DSI 7" touch screen and FullHD/4K hdmi screen.
I would need to display custom pixels on the HDMI Screen, by accessing directly the Framebuffer and keep showing a chromium page on the DSI 7" touch screen.

Is it possible?
I try running start x in framebuffer mode but never get it work ;D
Search a lot on internet but never found the solution. When X is started, I cannot manager framebuffer. When it's not started, frame buffer access is ok but of course i cannot have a chromium on the touchscreen without X...

Help... ;D

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