AM2432: minimum Software and hardware requirement for customized board.

Tool/software:

Hi, 

In TI default board TMDS64EVM, we have  DDR type  MT40A1G16KD-062E.

I am using the sysconfig tool to config ddr parameter.  It was working fine.

In our customised board,  we are using DDR MT40A512M16TB-062E.  It was not working.

1. What is the minimum requirement for hardware?   We just check the clock behavior between two boards, it is the same behavior.   eg: VTT is 0.6 volts.  

2. What is the minimum requirement for software?

eg: 

a. do we need to change  board_ddrReginit.h?  

b. we don't need to pull up VTT, since hardware guy put it to 0.6

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Thanks.