I think I am satisfied that what I am seeing is a basic fault with the
LVGL V9/NuttX framebuffer driver.
LVGL V8/NuttX had, as LVGL traditionally needs, 2 buffers (full frame,
or partial, as required) and switches between them.
LVGL V9/NuttX directly uses the "/dev/fb0" framebuffer as best as
Thank you Gregory. I will read all of this and, so far, have skim read
the first you linked to and now understand it a little better already
and it confirms that the SAMA5D2 does indeed have a frame buffer
interface, that I register in my board bringup (so longer ago I'd
forgotten LOL) - but it
