How connected the physical buffer of the STM32L4R9 discovery board on the external PSRAM (with or without using GFXMMU)?

[DMart.19]

Hello! Has anyone ever already connected the physical buffer of the STM32L4R9 discovery board on the external PSRAM (with or without using GFXMMU)? All STM32 Cube examples are using a buffer in internal RAM...

When I put the buffer in PSRAM, the rendering on LCD is wrong: some white lines appear and sometimes all the content is wrong.

Actually, I have some LTDC FIFO underrun interrupts. I have follow advices of application note DM00287603.pdf (chapter LTDC required bandwidth) without success. :(

[STrop]

Hello David,

I currently try to do the same without satisfaction.

Did you manage to put the physical area of GFXMMU to PSRAM ?

Thanks

Simon