I'm using STM32H745I and I have problems using ethernet communication.

[WGril.1]

I'm trying to receive a packet of 15125 bytes. The packet is correctly fragmented in 11 packets, but of each fragment only the first 902 bytes are correct, the rest are equals to 0.

ETH_RX_BUFFER_SIZE: 1536

MEM_ALIGNMENT: 4

MEM_SIZE: 16360

LWIP_RAM_HEAP_POINTER: 0X30044000

MEMP_NUM_REASSDATA: 5

MEMP_NUM_FRAG_PBUF: 30

PBUF_POOL_SIZE: 32

PBUF_POOL_BUFSIZE: 2500

IP_REASS_MAXAGE: 10

IP_REASS_MAX_PBUFS: 50

TCP_MSS: 1460

ETH_RX_DESC_CNT: 15

ETH_TX_DESC_CNT: 4

.lwip_sec (NOLOAD) : {

. = ABSOLUTE (0X30000000);

*(.RxDescripSection)

. = ABSOLUTE (0X30000620);

*(.TxDescripSection)

. = ABSOLUTE (0X30000800);

*(.RxArraySection)

} > RAM_D2

[t.decker]

There are a lot of things to take care of. Have you already found these useful pages?

https://community.st.com/s/question/0D50X0000BOtfhnSQB/how-to-make-ethernet-and-lwip-working-on-stm32

https://community.st.com/s/article/FAQ-Ethernet-not-working-on-STM32H7x3

[WGril.1]

It seems to me that everything corresponds to what is described in the guide, except for the MPU. I disabled the MPU.

[LCE]

I don't know the H745 SRAM mapping, but are you sure that all that fitting in there where it should?

For the H723..H735 series (which has a different SRAM mapping than the H745) it was mostly important to set the descriptors in SRAM2.

Data and lwIP stuff can be put anywhere except TCM.

I thin the H74x had some limits concerning ETH / AXI RAM, but not sure.

And can you receive smaller packets without error?

[WGril.1]

This is memories definition:

RAM (xrw) : ORIGIN = 0X24000000, LENGHT = 512K

FLASH (rx) : ORIGIN = 0X08000000, LENGHT = 1024K

DTCRAM (xrw) : ORIGIN = 0X20000000, LENGHT = 128K

RAM_D2 (xrw) : ORIGIN = 0X30000000, LENGHT = 512K

RAM_D3 (xrw) : ORIGIN = 0X38000000, LENGHT = 64K

ITCMRAM (xrw) : ORIGIN = 0X00000000, LENGHT = 64K

I receive correctly smaller packets. There seems to be something limiting the reception as I always correctly receive the same number of bytes