@LCE Bro, You are correct.
The RAM_D2 memory in the chip STM32H723ZGT6 I use is 32KB in total (32KB memory starting from address 0x30000000). I use the first 256B to define the RX/TX descriptor of ETH, and I have calculated that the given memory is sufficient. Please see my link script definition, so I can use the remaining space of RAM_D2 for RX/TX buffer. In fact, I also defined it in the link script like this, but in fact, if it is used in this way, it will cause the program to freeze when pinging the network with 1472 bytes, and it will definitely happen. Based on the above, I modified the RX/TX buffer to RAM (128KB memory starting from address 0x24000000), and this way I can run the 1472-byte long-term ping program.
.lwip_rx_pollsection(NOLOAD):
{
. = ABSOLUTE(0x24000000);
. = ALIGN(32);
*(.Rx_PoolSection)
}>RAM AT>FLASH
.lwip_sec (NOLOAD) :
{
. = ABSOLUTE(0x30000000);
*(.RxDecripSection)
. = ABSOLUTE(0x30000080);
*(.TxDecripSection)
} >RAM_D2 AT>FLASH
Because I modified the RX/TX buffer to RAM, do I not need to open the CACHE?
And I determined that the RX/TX buffer occupies about 19KB of space, so does the space defined in my MPU function need to be larger than 19KB? I'm suddenly not sure why the demo needs to set the 16KB after the starting address 0x30004000.
/* Disables the MPU */
HAL_MPU_Disable();
/** Initializes and configures the Region and the memory to be protected
*/
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.BaseAddress = 0x30000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_256B;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/** Initializes and configures the Region and the memory to be protected
*/
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.BaseAddress = 0x30004000;
MPU_InitStruct.Size = MPU_REGION_SIZE_16KB;
MPU_InitStruct.SubRegionDisable = 0x0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enables the MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
Bro,I'm not sure where the setting went wrong. Can you provide your configuration for reference?
