Hello. Thank you very much for this great project!
I copied the STM32F746 example that comes with ChibiOS (LED blinker) and made the changes to the makefile described on the wiki.
I added some code to main.c that initializes a console and prints some text to it. This works when run from an example that uses raw32 instead of ChibiOS.
With ChibiOS, however, it looks like every other vertical line is skipped. The text is recognisable as text, but not readable. I added a yellow bar to the bottom, but it comes out as alternative yellow and black lines.
I have enabed CONTROL to rotate the display 180 degrees. This worked in raw32. Using Chibi, if I disable them, I get the errors in the attached file about PIXELFORMAT macros not being defined for the STM32 display driver, but in a way that would only show up if CONTROL is not enabled. The output is still garbled in the same way. I think this might be related - and the output looks like it could be data written incorrectly.
gfxconf.h
make.err
Makefile