Hi all,
I am working with STM32H723VGT6, using ETH and SPI4.
I have configured Ethernet following this ST Community guide:
https://community.st.com/t5/stm32-mcus/how-to-create-a-project-for-stm32h7-with-ethernet-and-lwip-stack/ta-p/49308
When I follow the instructions exactly, I noticed that memp_memory_RX_POOL_base is located at 0x24000000.
Current problem
When running my program, the crash occurs at:
struct pbuf *q;
q = pbuf_alloc(PBUF_TRANSPORT, length, PBUF_RAM);
Inside pbuf_alloc, in the case PBUF_RAM:
p = (struct pbuf *)mem_malloc(alloc_len);
In mem_malloc, the program fails at:
/* Scan through the heap searching for a free block that is big enough */
for (ptr = mem_to_ptr(lfree); ptr < MEM_SIZE_ALIGNED - size;
ptr = ptr_to_mem(ptr)->next) {
mem = ptr_to_mem(ptr);
}
Although mem is allocated with the LWIP heap pointer address successfully, at the same time, ETH->DMAErrorCode reports 0x4080.
What I have configured
I have set up MPU regions for DMA descriptors and LWIP RAM heap.
RX pool is located in D1 SRAM (0x24000000).
DMA descriptors are in D2 SRAM (0x30000000 onwards).
LWIP RAM heap pointer for TX buffers is set correctly in D2 SRAM.
Observations
The crash seems related to mem_malloc scanning the heap, possibly because of DMA or MPU configuration.
ETH DMA fails immediately with code 0x4080 when trying to allocate pbuf.
Files attached
main.c with MPU configuration
Screenshots showing memory map and error
Other relevant configuration
Questions
Is it safe to locate memp_memory_RX_POOL_base in D1 SRAM (0x24000000) on STM32H723?
Should RX pool be moved to D2 SRAM, even if only 32 KB is available? How to divide RX descriptors, RX pool, and TX heap safely?
Are there known issues with mem_malloc + pbuf_alloc when using D1 SRAM + DMA ETH on H723?
Any guidance or suggestions will be highly appreciated!
Thanks,
