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STM32F407 MAC Tx issue

Question asked by Vignan on Feb 4, 2014

I am using  IAR Ewarm 6.6 example WebServer using LwIP 1.32.   The code compiles and loads fine. I also receive  Ethernet packets fine but I am  not able to transmit them.

       The   ARP and DHCP frames are formed, and handed off to the DMA engine, and it looks like we  get the DMA complete too, but the MII pins never pass the frame to the PHY (PHY is TI/National DP83848).   And frames never show up on Ethernet.

Any idea/suggestin what might be causing this?