I successfully loaded Marlin 2.0.5.3 onto the Trigorilla Pro board in my Anycubic Predator delta. To get it to compile I had to add the line "board_build.core=maple" to the trigorilla_pro environment in the platformio.ini file. When the Predator booted, the display was upside down, so I physically rotated the screen which solved that problem.
Next, the printer would not properly probe or calibrate until I changed the nozzle height to 456 mm, (from the default of 427mm) and recompiled. After that, all was well, and the printing was fantastic!
Now, in attempting to jump from Marlin 2.0.5.3 to Marlin 2.0.6 (which directly "supports" the Predator and its Trigorilla Pro board), the touch pads on the screen have moved to the top, and reversed left to right. If I could rotate the displayed information 180 degrees (but NOT the touch areas), all would be well. I would just have to physically place the screen back the way it was originally.
I have spent roughly a week, and probably 30 re-flashes of new Marlin compiles, trying to solve this. The compiles under Platformio go fine, but the Trigorilla Pro just doesn't like the resulting firmware.bin file.
Any input would be immensely appreciated!