I am glad to see that I am not the only one who gets confused by ST’s documentation.
I suppose that you also found : https://community.st.com/s/article/FAQ-DMA-is-not-working-on-STM32H7-devices ?
It shows this picture:
Yes I am sure that ETH works perfectly when I locate all DMA memories here:
RAM3 (xrw) : ORIGIN = 0x24000000, LENGTH = 512K
There is even confusion about the names “RAM3”. Have you seen this:
The memory at 0x24000000 has a size of 512 KB and it is called AXI SRAM
"SRAM3 has a differente address: 0x30040000 with a size of 128 KB.
Looking at the picture, it is indeed a long way from AXI to ETH, indeed through the D2toD1 AHB bridge.
Regards,
Hein