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TMS320C6746: Network problem on my custom board

Part Number: TMS320C6746

I am using the TFTP function in NDK 2.25. I have tested it both on LCDKC6748 and my custom board. On LCDKC6748, everything is ok. But on my custom board, the speed is very slow and the orange led blink abnormally fast. I couldn't figure out why.

My custom board's PHY chip is same as LCDKC6748. The reset pin of PHY chip is controlled by GPIO output of DSP, and it is pulled up in the main() function. Is it the reason caused the network slow?