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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).
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LWIP RAM heap pointer for TX buffers is set correctly in D2 SRAM.
Observations
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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
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main.c with MPU configuration
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Screenshots showing memory map and error
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Other relevant configuration
Questions
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Is it safe to locate memp_memory_RX_POOL_base in D1 SRAM (0x24000000) on STM32H723?
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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?
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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,
Hello,
I have checked the addresses of the related buffers:
DMARxDscrTab: 0x30000000
DMATxDscrTab: 0x30000100
memp_memory_RX_POOL_base: 0x24003460In lwipopts.h I configured:
#define LWIP_RAM_HEAP_POINTER 0x30000200
#define MEM_SIZE 32232For the MPU configuration, I am using the following setup:
void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct = {0};
HAL_MPU_Disable();
// Region 0: default no access //
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.BaseAddress = 0x0;
MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
MPU_InitStruct.SubRegionDisable = 0x87;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
// Region 1: descriptors in D2 SRAM //
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.BaseAddress = 0x30000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_32KB;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
// Region 2: small buffer region //
MPU_InitStruct.Number = MPU_REGION_NUMBER2;
MPU_InitStruct.Size = MPU_REGION_SIZE_512B;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
// Region 3: D1 SRAM (disabled in current config) //
MPU_InitStruct.Number = MPU_REGION_NUMBER3;
MPU_InitStruct.BaseAddress = 0x24000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_32KB;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
//HAL_MPU_ConfigRegion(&MPU_InitStruct);
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}When I set a breakpoint inside HAL_ETH_ReadData, the execution reaches HAL_ETH_RxLinkCallback but then fails with a DMAErrorCode.
If I do not set any breakpoint, there is no error, but the board does not respond to pings.
From Wireshark, I can see that the PC sends ARP requests to the STM32, but the STM32 does not reply.
My LWIP network configuration is as follows:
IP_ADDRESS: 192.168.1.198
NETMASK: 255.255.255.0
GATEWAY: 192.168.1.1
On my PC I am using:
IP_ADDRESS: 192.168.1.68
NETMASK: 255.255.255.0
GATEWAY: 192.168.1.1
The firewall on the PC is disabled.
In the main loop I call the following:
while (1)
{
ethernetif_input(&gnetif);
sys_check_timeouts();
}Could you please advise if there is anything wrong with the current MPU or memory configuration, or if additional steps are required for proper Ethernet RX/TX operation?
Best regards,
