MIPI-DSI driver (tft.c), ST7701, STM32 (without GRAM)?

How-to
1

Hello

All LVGL MIPI-DSI examples/ports I have seen so far are based on the Discovery boards from STM32 which use a display from Orisetech OTM8009.

This OTM8009 is a chip with internal GRAM, but many displays use chips without internal GRAM like the ST7701 from Sitronix.

So my question:
How would I have to change the tft.c file if there is no internal GRAM? (for example if there would be a OTM8009 w/o GRAM)

Are there any examples? Or do you have any hints?

Below you will find the link to the LVGL driver file I refer to:

Thank you