Black lines when using DMA2D on STM32H7 with SDRAM

Hi,

I am using TouchGFX 4.13 on a STM32H750XB.

I'm using a 800x480 screen, so the framebuffers are placed in external SDRAM.

My code is based of the example project for the STM32H750B-DK, and almost

everything seems to be working except for the fact that I get black lines when enabling the Chrom-Art.

Here is an example of what it looks like:

These lines seem to appear when dma2d is used to add an image to the framebuffer.

(Some TiledImages are used, explaining the seemingly random lines at the left/bottom).

When the Chrom-Art is not used, everything looks fine.

Similar code has worked when using a smaller screen and placing the framebuffers in AXI-SRAM, so my guess is that this problem has something to do with the SDRAM, but I can't figure out what it is I'm doing wrong.

Does anybody have any suggestions?