CCS/TMS320C6746: I have a LCDKC6748 board and test uart and network ok, but not worked on my custom C6746 board.

Please what are the differences between the LCDK and the custom board. Are you using same input oscillator value and DDR ? Best way to bring up a new board is to initilaizing the clock and validate DDR interface and then start checking out interfaces.

Indicate if you are using ssame UART instance, if not have you set the pinmux correctly ? Highlight any differences in the ethernet interface like different PHY or clocking etc.