Touch controller: XPT2046 (ADS7846)
Display controller: ILI 9486
It should be “more or less” compatible with the official Zynscreen.
If not, try some waveshare 3.5 display from the list. They use the same chips (more or less) and have the same resolution.
This options should work “more or less”, but probably, there will be some problem like rotated display, not working or rotated touch, backlight problems, etc.
The best you can do is create a custom config display using the manufacturer scripts & repo as source. From the install script, i see they are using this overlay:
(LCD-show/LCD35-show at master · goodtft/LCD-show · GitHub)
The overlay is available on the same repo, inside the “usr” folder. You should copy it to “/boot/overlays” and rename it to “tft35a-overlay.dtbo”. I just downloaded and renamed it for you:
tft35a-overlay.dtbo (2.6 KB)
Anyway, i would recommend to start with a fresh-burned SD and don’t install anything from the manufacturer, except the overlay.
When you have a fully working config, you can send a PR to the zynthian-sys repo, or simply report here and i would do, so your display get listed on the webconf.