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STM32F746 discovery Ethernet don't work if the LwIP MEM_SIZE value is increased.

Question asked by mendes.ari.001 on Dec 6, 2016
Latest reply on Dec 7, 2016 by bauch.aaron.001


I used the CubeMX 4.18 to do a simple LwIP UDP server project for the STM32F746-Discovery board. It works well for the default configuration. But If the LwIP MEM_SIZE is increased for 64K bytes or more, or if a buffer with 64K bytes or more is created. The Ethernet don't work anymore, neither for reception or for transmittion. 


Anyone have any idea about the cause of this issue?