Thanks for the reply. I understand that not all boards are wired the same, which is exactly why I’m looking for STM32H753ZI-specific guidance, not generic Ethernet steps.
I’m using a NUCLEO-H753ZI (LAN8742 PHY, RMII). Link LEDs are up and blinking, PHY reports link-up and auto-negotiation complete. I’ve tested official ST CubeH7 LwIP examples on NUCLEO-H743ZI and ping works there, but using the same configuration on H753 ping fails.
I’ve tried both DHCP and static IP, and I do have a DHCP server running when needed. I’m also checking ETH MAC registers, PHY registers, and LwIP netif state.
Where I’m stuck is mainly around Cortex-M7 cache/MPU handling on H753:
correct RMII 50 MHz clock source
correct placement of ETH DMA descriptors and buffers (RAM_D2 vs AXI SRAM)
required MPU configuration for non-cacheable regions
whether extra cache maintenance is needed with FreeRTOS + LwIP on H753
any CubeMX differences between H743 and H753 that affect Ethernet
If there’s a known-working CubeMX .ioc, official ST example, or a checklist specific to NUCLEO-H753ZI Ethernet, that would really help.
